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Analysis and design of axially loaded piles in rock 预览
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作者 C.M.Haberfield A.L.E.Lochaden 《岩石力学与岩土工程学报:英文版》 CSCD 2019年第3期535-548,共14页
Despite significant advancements in in situ test techniques,construction practices,understanding of rock joint and rock mass behaviours,and numerical analysis methods,the design of bored concrete cast-insitu piles in ... Despite significant advancements in in situ test techniques,construction practices,understanding of rock joint and rock mass behaviours,and numerical analysis methods,the design of bored concrete cast-insitu piles in rock is still largely based on the assessment of bearing capacity.However,for many of the rock conditions encountered,the bearing capacity of piles is a nebulous concept and a figment of the designer’s imagination.Even if it can be reasonably quantified,it has little,if any,significance to the performance of a pile in rock.The load carrying capacity of even low strength rock(in most situations)is far in excess of the strength of the structure(for example,a building column)transmitting the load.Unsatisfactory performance of a pile in rock is usually a displacement issue and is a function of rock mass stiffness rather than rock mass strength.In addition,poor pile performance is much more likely to result from poor construction practices than excessive displacement of the rock mass.Exceptions occur for footings that are undermined,or where unfavourable structure in the rock allows movement towards a free surface to occur.Standards,codes of practices,reference books and other sources of design information should focus foundation design in rock on displacement rather than strength performance.Ground investigations should measure rock mass stiffness and defect properties,as well as intact rock strength.This paper summarises the fundamental concepts relating to performance of piles in rock and provides a basis for displacement focused design of piles in rock.It also presents comments relating to how piles are modelled in widely used commercial finite element software for soil-structure interaction analysis,within the context of the back-analysis of a pile load test,and proposes recommendations for pile analysis and design. 展开更多
关键词 PILE design PILE ANALYSIS PILE load test FINITE element ANALYSIS
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A major pathway for carbon and nitrogen losses- Gas emissions during storage of solid pig manure in China 预览
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作者 SHAN Nan LI Hu +4 位作者 LI Jian-zheng Ee Ling Ng MA Yan WANG Li-gang CHEN Qing 《农业科学学报:英文版》 SCIE CAS CSCD 2019年第1期190-200,共11页
This study investigated the carbon (C) and nitrogen (N) gas emissions (N2O, NH3, CO2 and CH4) from solid pig manure management in China. Gas emissions were quantified from static piles over 60 days during summer in Ch... This study investigated the carbon (C) and nitrogen (N) gas emissions (N2O, NH3, CO2 and CH4) from solid pig manure management in China. Gas emissions were quantified from static piles over 60 days during summer in China’s Yangtze River Basin, using Drager-Tube and static chamber-gas chromatography techniques. High emissions of NH3 and N2O were observed at the early stage of storage, but high emission of CH4 occured later during storage. Overall, 62% of the total C in the original pile was lost;CO2 and CH4 emissions accounted for 57 and 0.2% of C lost respectively. Over the same time, 41% of the total N in the original pile was lost;NH3 and N2O emissions accounted for 15 and 0.3% of N lost respectively. The volatilization of NH3 during storage in summer was 4.56 g NH3 per kg dry weight. The total greenhouse gas (GHG) emissions during storage accounted for 67.93 g CO2 equivalent per kg dry weight;N2O and CH4 contributed to 46 and 55% of total GHG emissions respectively. Given China’s major role in pig production, further attention should given to pig manure management to mitigate its contribution to atmospheric pollution. 展开更多
关键词 STORAGE static PILE ammonia nitrogen and carbon emissions GREENHOUSE gas emission PIG MANURE management
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The Shaking Table Test on the Performance of Cement-mixed Piles in Liquefiable Railway Foundations 预览
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作者 ZHAO Mengyi XIE Qiang +1 位作者 CAO Xinwen ZHAO Wen 《中国地震研究:英文版》 CSCD 2019年第1期120-131,共12页
Cement-mixed piles, as countermeasure against liquefaction of silt and sand ground, can improve the shear strength and bearing capacity of foundation soil, meaning cement-mixed piles are capable of resisting displacem... Cement-mixed piles, as countermeasure against liquefaction of silt and sand ground, can improve the shear strength and bearing capacity of foundation soil, meaning cement-mixed piles are capable of resisting displacement when an earthquake happens. However, investigations of cement-mixed piles by experimental methods such as the shaking table test is few and far between. It is especially true for the seismic performance of cement-mixed piles in liquefiable railway foundations in high seismic intensity regions. To this end, a cross-section of the Yuxi-Mengzi railway was selected as the prototype and studied by the shaking table test in this study. The results showed that composite foundation of cementmixed piles was not liquefied when the seismic acceleration was lower than 0. 30g. In the process of acceleration increasing from 0. 30g at 2Hz to 0. 60g at 3Hz, the upper middle silt outside slope toe was partly liquefied. The foundation soil under the shoulders and center of subgrade was far from the initial liquefaction criterion during the test. Cementmixed piles can effectively reduce the embankment settlement and differential settlement. It can be concluded that, the design of cement-mixed piles can ensure the seismic performance of the subgrade, and satisfy the seismic design requirements of the Yuxi- Mengzi railway in areas of VIII degrees seismic fortification intensity. 展开更多
关键词 LIQUEFACTION Cement-mixed pile RAILWAY SHAKING table test
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碎石土土体性状对桩基水平承载能力的影响 预览
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作者 康舜 赵其华 +2 位作者 彭社琴 刘斌 陈继彬 《工程地质学报》 CSCD 北大核心 2019年第3期559-568,共10页
桩基作为一种广泛使用的基础形式,其在如地震荷载、风荷载下的水平承载力确定十分重要。桩基水平承载能力主要由桩身及土体性质控制,而土体性质中密实度和含石量是影响碎石土场地上桩基水平承载能力的主要因素。为明确碎石土场地土性对... 桩基作为一种广泛使用的基础形式,其在如地震荷载、风荷载下的水平承载力确定十分重要。桩基水平承载能力主要由桩身及土体性质控制,而土体性质中密实度和含石量是影响碎石土场地上桩基水平承载能力的主要因素。为明确碎石土场地土性对桩基水平承载能力的影响,在室内开展5组不同土体密实度和含石量下的水平场地单桩水平静载试验,以此模型试验数据计算所得的临界荷载、极限荷载、水平扩散角、计算宽度和水平抗力系数的比例系数m值等为指标评价土体密实度和含石量对桩基水平承载能力的影响。试验结果表明增大密实度和含石量对各指标均有提升效果,但相比之下,密实度对各项指标的提升效果均明显优于含石量。综合考量下,碎石土密实度和含石量的增大均对桩基水平承载力有提升作用,但土体密实度的提升作用更明显。故对水平承载力要求较高的碎石土上桩基工程的选址中,应优先选择密实度较大的场地。 展开更多
关键词 碎石土 桩基 计算宽度 M值 水平承载力
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高桩码头桩基局部偏位的平面简化计算法 预览
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作者 李志云 池海 张晋恺 《中国港湾建设》 2019年第4期13-16,共4页
桩基础作为高桩码头安全的根基,占工程总造价的40%~60%,桩基在打设过程中受到波浪、水流、施工定位、地形、地质等多重因素的影响,其偏位超出规范容许值的现象较为常见,如果处理不当将对码头造成安全隐患。文中提出平面简化计算方法,对... 桩基础作为高桩码头安全的根基,占工程总造价的40%~60%,桩基在打设过程中受到波浪、水流、施工定位、地形、地质等多重因素的影响,其偏位超出规范容许值的现象较为常见,如果处理不当将对码头造成安全隐患。文中提出平面简化计算方法,对支座约束条件和荷载进行简化处理,引述力矩分配法辅助求解,最后与有限元空间计算结果进行对比,证明了采用这种方法能够快速估算桩基偏位对码头结构承载力的主要影响,能够满足工程设计需求,为处理高桩码头偏位桩基提供理论依据。 展开更多
关键词 桩基 偏位 计算方法
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南海北部陆坡内孤立波对桩柱作用力的极值推算 预览
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作者 谢华荣 熊学军 陈亮 《海洋科学进展》 CAS CSCD 北大核心 2019年第2期171-186,共16页
内孤立波的发生常伴随着大振幅波动和突发性强流,对桩柱等海中结构物产生强烈破坏作用。基于KdV方程和Morison公式,在忽略高阶模态的情况下,探讨内孤立波对桩柱的单位作用力、总作用力、剪力和弯矩的极值问题,并利用2016-07南海北部陆... 内孤立波的发生常伴随着大振幅波动和突发性强流,对桩柱等海中结构物产生强烈破坏作用。基于KdV方程和Morison公式,在忽略高阶模态的情况下,探讨内孤立波对桩柱的单位作用力、总作用力、剪力和弯矩的极值问题,并利用2016-07南海北部陆坡的实测资料对理论结果进行检验。结果表明:1)在内孤立波最大振幅所在的垂向剖面上,上层与下层各存在一个单位作用力极值,且二者方向相反,上层总作用力强于下层,最大剪力和弯矩分别发生于水平流速的转向层和海底;2)各水层中,沿着内孤立波的传播方向,所有作用力的数值均随时间的推移先递增后递减,存在正向或负向的最大值;3)全水层总作用力极值发生在半周期,其值与波动振幅和水平波速有关,其他作用力极值发生于最大振幅时刻之前,作用力极值与振幅和非线性波速正相关,与水平特征宽度负相关;4)单位作用力极值的时间提前量与振幅和水平特征宽度强相关,与非线性波速弱相关。 展开更多
关键词 内孤立波 桩柱 作用力 KDV方程 Morison公式
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桩体刺入全过程褥垫层的工作特性 预览
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作者 周志军 郑昊 《土木与环境工程学报(中英文)》 CSCD 北大核心 2019年第3期41-48,共8页
褥垫层是复合地基的核心构成,能协调桩、土之间的差异变形。在桩体刺入褥垫层的过程中,褥垫层的工作特性在发生变化,这方面研究还较少见。通过室内模型试验,观测桩体刺入褥垫层不同深度的桩顶压力、桩顶位移量、褥垫层的变形等试验结果... 褥垫层是复合地基的核心构成,能协调桩、土之间的差异变形。在桩体刺入褥垫层的过程中,褥垫层的工作特性在发生变化,这方面研究还较少见。通过室内模型试验,观测桩体刺入褥垫层不同深度的桩顶压力、桩顶位移量、褥垫层的变形等试验结果,来研究褥垫层的全过程工作特性,并分析桩间土压力、桩径等对褥垫层的影响。结果表明:在桩体刺入过程中,褥垫层存在压密变形、剪切变形、压碎变形3个阶段;桩间土压力对褥垫层的整个变形过程均有影响,在其他条件相同时,褥垫层抵抗的桩顶压力、褥垫层的承载厚度均随着桩间土压力的增大而增大;桩径对褥垫层的影响主要在压碎变形阶段,褥垫层的承载厚度随桩径的增大而增大,且基本呈线性增长。 展开更多
关键词 褥垫层 复合地基 模型试验 工作特性
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浅海围栏牧场中柱桩受力及波浪场分布试验 预览
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作者 王刚 王建康 +4 位作者 陈丁 王新鸣 陈国强 宋炜 王磊 《河北渔业》 2019年第6期36-44,共9页
通过物理模型试验的方法,对浅海围栏牧场设施中柱桩的受力及内部波浪场进行了研究。试验模型整体采用1∶20比尺,试验波要素设定五个波高,原型分别为1、2、2.5、3、3.5m,五个波浪周期分别为5、6、7、8、9s,五个流速分别为0.5、0.76、1、1... 通过物理模型试验的方法,对浅海围栏牧场设施中柱桩的受力及内部波浪场进行了研究。试验模型整体采用1∶20比尺,试验波要素设定五个波高,原型分别为1、2、2.5、3、3.5m,五个波浪周期分别为5、6、7、8、9s,五个流速分别为0.5、0.76、1、1.25、1.57m/s。测量在不同波流组合以及不规则波单独作用和流单独作用下迎浪侧最前方单根桩柱的受力情况及围栏牧场内波浪场情况。试验结果显示,随着波高和流速的增加,桩柱所受到的波流力逐步增大,在计算柱桩受力时,需要考虑到网衣受力带来的影响。波高及周期越大,围栏设施内的波浪场分布规律越明显,沿着波浪传播方向呈逐渐减小趋势,小波高及短周期时波浪场分布规律不明显。 展开更多
关键词 围栏牧场 桩柱 波流力 波浪场
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Dynamic response of a slope reinforced by double-row antisliding piles and pre-stressed anchor cables
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作者 FAN Gang ZHANG Jian-jing +1 位作者 QI Shun-chao WU Jin-biao 《山地科学学报:英文版》 SCIE CSCD 2019年第1期226-241,共16页
Large-scale shaking table tests were conducted to study the dynamic response of a slope reinforced by double-row anti-sliding piles and prestressed anchor cables.The test results show that the reinforcement suppressed... Large-scale shaking table tests were conducted to study the dynamic response of a slope reinforced by double-row anti-sliding piles and prestressed anchor cables.The test results show that the reinforcement suppressed the acceleration amplification effectively.The axial force time histories are decomposed into a baseline part and a vibration part in this study.The baseline part of axial force well revealed the seismic slope stability,the peak vibration values of axial force of the anchor cables changed significantly in different area of the slope under seismic excitations.The peak lateral earth pressure acting on the back of the anti-sliding pile located at the slope toe was much larger than that acting on the back of the anti-sliding pile located at the slope waist.The test results indicate an obvious load sharing ratio difference between these two anti-slide piles,the load sharing ratio between the two anti-sliding piles located at the slope toe and the slope waist varied mainly in a range of 2-5.The anti-slide pile at the slope waist suppressed the horizontal displacement of the slope surface. 展开更多
关键词 SLOPE stability ANTI-SLIDING PILE ANCHOR cable Seismic design SHAKING table test Earthquake
Assessment of seismic amplifi cation factor of excavation with support system 预览
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作者 Hamidreza Tavakoli Saman Soleimani Kutanaei Seyed Hossein Hosseini 《地震工程与工程振动:英文版》 SCIE EI CSCD 2019年第3期555-566,共12页
Retaining walls have been used in many construction projects such as for road and inclined surfaces protection. The damage caused by an earthquake depends on the fundamental frequency, amplitude and the duration of th... Retaining walls have been used in many construction projects such as for road and inclined surfaces protection. The damage caused by an earthquake depends on the fundamental frequency, amplitude and the duration of the seismic motion. These parameters strongly depend on the seismic properties of the layers that are near the surface. In the study of retaining walls, in addition to the infl uence of soil, the infl uence of topography is also important. In the present study, site response analysis is performed by using fi nite element software PLAXIS to obtain the eff ect of various factors such as embedded length of the sheet pile, underground water table, length and angle of the nail, shear wave velocity of soil on site eff ect and dynamic response. Moreover, for better understanding of the eff ect of the above parameters, the stability analysis was performed by using shear reduction method. The results show that an increase in the embedded length of the sheet pile and the length of nailing causes an increase in the amplifi cation factor. Moreover, for shear-wave velocity in the range of 200- 600 m/s, the amplifi cation factor increases with increase of the shear-wave velocity due to the decrease of nonlinear behavior. 展开更多
关键词 amplifi CATION FACTOR safety FACTOR shear wave velocity NAILING sheet PILE
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考虑径向波动效应的黏弹性支承桩纵向振动阻抗研究 预览
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作者 孟坤 崔春义 +3 位作者 许成顺 梁志孟 孙宗光 王本龙 《振动工程学报》 EI CSCD 北大核心 2019年第2期296-304,共9页
基于桩体三维轴对称模型考虑其径向波动效应,将桩及桩周土分别视为弹性和黏弹性连续介质,建立了三维轴对称桩-土耦合系统纵向振动分析模型。具体采用分离变量法分别求得桩身及桩周土位移基本解,进而利用桩土完全耦合条件推导得出频域内... 基于桩体三维轴对称模型考虑其径向波动效应,将桩及桩周土分别视为弹性和黏弹性连续介质,建立了三维轴对称桩-土耦合系统纵向振动分析模型。具体采用分离变量法分别求得桩身及桩周土位移基本解,进而利用桩土完全耦合条件推导得出频域内桩顶动力阻抗解析解答,并将所得解析解与已有解答进行比较验证其合理性。在此基础上,通过进一步参数化分析探讨了桩底支撑刚度系数、桩身径向波动效应及桩长对桩顶动力阻抗的影响规律。结果表明:当桩身长径比较小时,采用Rayleigh-Love杆模型近似考虑桩身三维波动效应误差较大,此时采用三维轴对称桩体模型和所得相关解析解答更能合理考虑桩身径向波动效应的影响。 展开更多
关键词 纵向振动 三维轴对称 径向波动效应 黏弹性支承 动力阻抗
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不均匀饱和土中变波阻抗桩的纵向振动特性 预览
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作者 高放 刘东甲 +1 位作者 常新敏 卢志堂 《合肥工业大学学报:自然科学版》 CAS 北大核心 2019年第2期247-251,共5页
为揭示饱和土中桩的纵向振动特性,文章建立了不均匀饱和土中变波阻抗桩的纵向振动模型.利用Laplace变换,得到了土层平面应变模型下对桩身的动力阻抗,并求得了桩身任意段的动力响应;利用传递矩阵,给出了桩顶复刚度的解析表达式;阐明了单... 为揭示饱和土中桩的纵向振动特性,文章建立了不均匀饱和土中变波阻抗桩的纵向振动模型.利用Laplace变换,得到了土层平面应变模型下对桩身的动力阻抗,并求得了桩身任意段的动力响应;利用传递矩阵,给出了桩顶复刚度的解析表达式;阐明了单相土模型的不足,并分析了桩身缺陷及饱和土渗透性对桩动力特性的影响.结果表明:采用单相土模型会低估桩顶低频段的动刚度,对动阻尼影响较小,一定程度上说明了土体模型对分析桩动力特性的重要性;桩身存在缺陷会使桩顶的动刚度明显减小,动阻尼增大;饱和土渗透性变差会有效增大缺陷桩的动刚度,减小桩的共振频率,并减缓动阻尼随频率变化的增长速率. 展开更多
关键词 不均匀饱和土 变波阻抗 纵向振动 动力特性
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冲刷作用对连续梁桥桩基地震响应影响 预览
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作者 刘泳钢 吕龙 《四川建筑科学研究》 2019年第1期17-21,共5页
以一四跨连续箱梁为背景,建立了三维有限元模型,采用m法模拟了土体对桩基的约束作用,计算了不同桩基冲刷深度下结构动力特性和地震响应,研究了冲刷作用对结构地震响应的影响。结果表明:冲刷作用对冲刷桩基纵向地震受力不利,对未冲刷桩... 以一四跨连续箱梁为背景,建立了三维有限元模型,采用m法模拟了土体对桩基的约束作用,计算了不同桩基冲刷深度下结构动力特性和地震响应,研究了冲刷作用对结构地震响应的影响。结果表明:冲刷作用对冲刷桩基纵向地震受力不利,对未冲刷桩基纵向地震内力影响较小;无减隔震支座情况下,冲刷作用减缓未冲刷桩基横向地震受力;采用减隔震支座将加剧冲刷作用对冲刷桩基地震内力的不利影响。 展开更多
关键词 连续梁桥 有限元模型 桩基 冲刷 地震响应
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不同组合下高喷插芯组合桩抗拔承载特性试验研究 预览
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作者 任连伟 吕陈陈 +2 位作者 张建伟 肖扬 张敏霞 《土木建筑与环境工程》 CSCD 北大核心 2018年第3期94-101,共8页
基于自主研发的大型桩基模型试验加载系统,采用砂雨法施工,对4种不同组合形式的高喷插芯组合桩(JPP桩)进行了抗拔承载性能对比试验研究。结果表明:1)JPP桩的不同组合形式对抗拔承载力有较大影响,下组合抗拔承载能力最高,其承载能力... 基于自主研发的大型桩基模型试验加载系统,采用砂雨法施工,对4种不同组合形式的高喷插芯组合桩(JPP桩)进行了抗拔承载性能对比试验研究。结果表明:1)JPP桩的不同组合形式对抗拔承载力有较大影响,下组合抗拔承载能力最高,其承载能力是分段组合II的1.1倍,是分段组合I的1.3倍,是上组合的1.4倍。2)极限荷载下,组合段所提供的总侧摩阻力中,下组合最高。3)在桩体上拔过程中,桩身轴力沿桩身向下依次递减;随着荷载的增加,桩身上部侧摩阻力首先达到极限值并趋于稳定,然后桩身中下部侧摩阻力逐渐发挥。4)侧摩阻力随桩土相对位移的增加而逐渐变大,在桩土相对位移较小时便达到较大值,桩身上部的侧摩阻力在达到较大值后趋于稳定,桩身中下部不同位置处的侧摩阻力在达到较大值仍有不同程度递增的趋势,总体上呈现出双曲线的分布形式。 展开更多
关键词 组合桩 抗拔承载力 模型试验 桩土界面剪切
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Mechanical Properties of Three-Dimensional Fabric Sandwich Composites 预览
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作者 曹海建 陈红霞 黄晓梅 《东华大学学报:英文版》 EI CAS 2018年第5期384-388,共5页
Three-dimensional(3D)fabric composite is a newly developed sandwich structure,consisting of two identical parallel fabric decks woven integrally and mechanically together by means of vertical woven fabrics.In this pap... Three-dimensional(3D)fabric composite is a newly developed sandwich structure,consisting of two identical parallel fabric decks woven integrally and mechanically together by means of vertical woven fabrics.In this paper,six types of 3D fabric sandwich composites were developed in terms of compressive and flexural properties as a function of pile height(10,20 and 30 mm)and pile distance(16,24 and 32 mm)in pile structures.The mechanical characteristics and the damage modes of the 3D fabric sandwich composites under compressive and flexural load conditions were investigated.Besides,the influence of pile height and pile distance on the 3D fabric sandwich composites mechanical properties was analyzed.The results showed that the compressive properties decreased with the increase of the pile height and the pile distance.Flexural properties increased with the increase of pile height,while decreased with the increase of pile distance. 展开更多
关键词 three-dimensional(3D)fabric SANDWICH composite COMPRESSIVE PROPERTY FLEXURAL PROPERTY PILE HEIGHT PILE distance
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钢筋混凝土灌注桩质量监督与控制 预览
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作者 庄国武 《中小企业管理与科技》 2018年第11期173-174,共2页
桩基工程关系到工程的寿命周期的安全,是建筑工程质量监督的关键,因其隐蔽性和结构复杂性,给质量监督带来了难度,根据技术管理及工程经验,在此精炼出桩基质量管理及控制的基本要点。
关键词 质量监督 承载机理 地耐力 桩身强度
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Research on pile performance and state-of-the-art practice in cold regions 预览
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作者 JianKun Liu TengFei Wang Zhi Wen 《寒旱区科学:英文版》 CSCD 2018年第1期1-11,共11页
A pile foundation is commonly adopted in geotechnical engineering to support structures,and its application has been extended to cold-regions engineering.In past decades,a host of scholars investigated pile behaviors ... A pile foundation is commonly adopted in geotechnical engineering to support structures,and its application has been extended to cold-regions engineering.In past decades,a host of scholars investigated pile behaviors and proposed design guidelines for seasonally frozen ground or permafrost.This paper reviews the research with respect to pile performance and engineering practice in cold regions,organized as follows:(1)creep tests and bearing capacity,(2)frost-jacking hazards,(3)laterally loaded piles,(4)dynamic responses,(5)refreezing due to concrete-hydration heat,and(6)improved countermeasures and design methods.We first summarize previous research and recent progress;then,predict the development trend of pile foundations in cold regions and recommend further research. 展开更多
关键词 PILE foundation bearing capacity CREEP test PILE design FROST JACKING PERMAFROST
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低围压下极限摩阻力对回填体基桩承载特性的影响
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作者 陈骅伟 陈兆 +1 位作者 蒋冲 李煜 《岩土工程学报》 CSCD 北大核心 2018年第S2期87-90,共4页
为了研究回填体极限摩阻力变化对基桩承载特性的影响,通过考虑低围压下回填体极限摩阻力的非线性变化,获得指数型荷载传递函数的回填体桩基Q–S曲线计算方法,对比现有研究成果与工程实例验证该计算方法,并探讨了极限摩阻力参数对桩承载... 为了研究回填体极限摩阻力变化对基桩承载特性的影响,通过考虑低围压下回填体极限摩阻力的非线性变化,获得指数型荷载传递函数的回填体桩基Q–S曲线计算方法,对比现有研究成果与工程实例验证该计算方法,并探讨了极限摩阻力参数对桩承载特性的影响。分析结果表明:嵌岩段的桩侧摩阻力先达到极值,回填体的极限摩阻力随着桩侧法向应力?与回填体的试验参数A,b的增加而增加,提高桩侧摩阻力和桩基的极限承载力,法向应力?对桩侧摩阻力和桩的极限承载力影响很明显。 展开更多
关键词 低围压 承载特性 摩阻力 荷载传递法
Ultimate Lateral Capacity of Rigid Pile in c–φ Soil 预览
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作者 ZHANG Wei-mina 《中国海洋工程:英文版》 SCIE EI CSCD 2018年第1期41-50,共10页
To date no analytical solution of the pile ultimate lateral capacity for the general c–φ soil has been obtained. In thepresent study, a new dimensionless embedded ratio was proposed and the analytical solutions of u... To date no analytical solution of the pile ultimate lateral capacity for the general c–φ soil has been obtained. In thepresent study, a new dimensionless embedded ratio was proposed and the analytical solutions of ultimate lateral capacity and rotation center of rigid pile in c–φsoils were obtained. The results showed that both the dimensionless ultimate lateral capacity and dimensionless rotation center were the univariate functions of the embedded ratio. Also,the ultimate lateral capacity in the c–φ soil was the combination of the ultimate lateral capacity (fc) in the clay, and the ultimate lateral capacity (fφ) in the sand. Therefore, the Broms chart for clay, solution for clay (φ=0) put forward by Poulos and Davis, solution for sand (c=0) obtained by Petrasovits and Awad, and Kondner’s ultimate bending moment were all proven to be the special cases of the general solution in the present study. A comparison of the field and laboratory tests in 93 cases showed that the average ratios of the theoretical values to the experimental value ranged from 0.85 to 1.15. Also, the theoretical values displayed a good agreement with the test values.. 展开更多
关键词 PILE ULTIMATE LATERAL capacity DIMENSIONLESS ANALYTICAL solution c–φ soils HYPERBOLIC function method
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斜坡基桩的斜坡空间效应及其水平承载特性研究
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作者 尹平保 贺炜 +1 位作者 张建仁 王玉魁 《土木工程学报》 CSCD 北大核心 2018年第4期94-101,共8页
为研究水平荷载作用下斜坡基桩的斜坡空间效应对其承载特性的影响,设计并完成了不同坡度及水平荷载作用角度下斜坡基桩室内模型试验,测得了桩顶荷载位移曲线及桩身弯矩分布。结果分析表明:水平荷载相同时,桩顶水平位移及桩身最大弯... 为研究水平荷载作用下斜坡基桩的斜坡空间效应对其承载特性的影响,设计并完成了不同坡度及水平荷载作用角度下斜坡基桩室内模型试验,测得了桩顶荷载位移曲线及桩身弯矩分布。结果分析表明:水平荷载相同时,桩顶水平位移及桩身最大弯矩均随坡度增加呈非线性增大,随水平荷载作用角度增加而呈线性减小;基桩水平极限承载力却随坡度增加而减小,随水平荷载作用角度增加而增大。坡度每增加30°,桩顶水平位移约增大1.3~1.9倍,桩身最大弯矩增大约17%~30%;水平荷载作用角度每增加30°,桩顶水平变形减小约25%-30%,桩身最大弯矩减小约6%~11%。斜坡基桩的桩身最大弯矩位于地面以下3~6倍桩径范围内,坡度越大桩身最大弯矩位置越深。分析得到了基桩水平极限承载力拟合公式,可以为斜坡基桩设计提供参考。 展开更多
关键词 基桩 斜坡 斜坡空间效应 模型试验 水平承载特性 极限承载力
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