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银川滨河路粉土力学性能试验研究 预览

Mechanical Properties of Silty Soils in Binhe Road of Yinchuan
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摘要 为研究围压和含盐渍对银川滨河路粉土力学特性的影响,采用英国GDS公司生产的空心圆柱扭剪仪(HCA)在100,200,300kPa围压下进行三轴固结排水剪切试验。结果表明:粉土的应力应变关系曲线属于弱软化型,并有剪胀现象发生;随着围压增大,粉土的抗剪强度增大,剪胀趋势减弱;随着盐分含量的增加,粉土的抗剪强度增大,剪胀趋势增加。由此可见,围压和盐分对粉土的抗剪强度均有明显的影响,围压的增加,有利于增加土体抗剪强度,而盐分含量升高会使得粉土更加容易发生剪胀吸水,不利于地基的安全。 In order to analyze the influence of confining pressure and salinification on silty soils in Binhe road of Yinchuan, a series of tri-axial consolidated drained shear test were carried out under confining pressures of 100, 200, 300 kPa, by using hollow cylinder apparatus made by GDS. The results show that the stress-strain curves of the silty soils are a slightly softening type with a phenomenon of shear dilatancy. And with the increasing of confining pressure, the shear strength of the silty soil increases but the shear dilatancy weakens gradually. What's more, with the increasing of salt content, the shear strength increases and shear dilatancy becomes obvious. It can be concluded that both confining pressure and salt content have a marked effect on the shear strength of silty soil. The increase of confining pressure is propitious to improve the shear strength of silty soil, while the increasing of salt content may induce shear dilatancy and water absorption, which is adverse to the safety of subgrade in highway.
作者 封少博 王燕昌 马文国 张刚 杨有贞 FENG Shaobo;WANG Yanchang;MA Wenguo;ZHANG Gang;YANG Youzhen(School of Electric-Electrical Engineering, Ningxia University, Yinchuan 75002,China;Academic Journal Center, Ningxia University, Yinchuan 75002,China)
出处 《宁夏工程技术》 CAS 2019年第1期32-36,共5页 Ningxia Engineering Technology
基金 国家自然科学基金资助项目(51768059,11662015) 宁夏高等学校科研资助项目(NGY2017044) 宁夏大学自然科学基金资助项目(ZR16024)。
关键词 粉土 围压 盐渍 剪胀 三轴剪切 抗剪强度 silty soil confining pressure salinification shear dilatancy tri-axial shear test shear stength
作者简介 封少博(1993—),男,硕士研究生,主要从事岩土材料力学性能试验检测分析研究(406630219@qq.com);通信作者:马文国(1980—),男,副教授,博士,主要从事岩土力学方面的教学和科研工作(mwg@nxu.edu.cn)。
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