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基于正交设计的复杂环境下土石混填体大型直剪试验研究直刿试验饼究 被引量:14

Large-scale direct shear tests on soil-rock aggregate mixture under complicated environment based on orthogonal design
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摘要 为了更加系统、全面的研究土石混填体处于复杂环境时的强度特性,综合考虑含水率、浸泡时间、干湿循环、含石量、岩性与土性等因素,采用美国Geotest公司生产的大型直剪仪,并基于正交设计方法开展了一系列土石混填体室内大型直剪试验研究,进而确定出了不同因素对土石混填体抗剪强度有何影响及影响程度,为此类受多因素、多水平影响的试验研究探讨出了一种新的思路。试验结果表明:土石混填体抗剪强度主要源于内部石料间的相互嵌入、咬合及摩擦等作用;含石量是影响土石混填体强度特性最主要的因素,随着试样中含石量的增加其内摩擦角近似呈线性增加;对于试验中所涉及的3种水作用环境,含水率对土石混填体抗剪强度的影响最为显著,且含水率对其剪应力-剪切位移关系曲线亦存在非常重要的影响,相比之下,浸泡时间与干湿循环对试样抗剪强度影响较弱,且试样在浸泡48h或干湿循环4次后其抗剪强度基本不会再继续弱化;当试样中含石量≥55%时,其抗剪强度受岩性影响较为明显。 In order to study the strength characteristics of soil-rock aggregate mixture under complex environment more systematically and comprehensively, a series of lab large-scale direct shear tests are conducted through Geotest direct shear apparatus based on the orthogonal experimental design. These tests take into account variable factors such as water content, soaking time, wetting/drying cycles, stone content, rock property and soil property, etc. Then the degree of influence of these factors on the shear strength of soil-rock aggregate mixture is determined, which can provide a new way for this kind of multi-factor and multi-level researches. The test results indicate that the shear strength of soil-rock aggregate mixture is caused by mutual embedding, mesh and friction of aggregated rock. The rock content is the single primary factor for influencing the strength property of rock-soil aggregate mixture. With the increase of the rock content in the test specimen, the internal friction angle increases linearly. In 3 kinds of varied water effect situations, the water content has the most significant impact on the strength of soil-rock aggregate mixture. It also has high influence on the shape of shear stress-shear displacement curve. In contrast, the soaking time and wetting/drying cycles are less important for the shear strength of rock-soil aggregate mixture, and the shear strength will not continue to weaken when the specimen is soaked for more than 48 hours or under 4 wetting/drying cycles. The shear strength of the specimen is obviously affected by the rock property when its rock content is not less than 55%.
作者 王江营 曹文贵 张超 汪辉平 WANG Jiang-ying, CAO Wen-gui, ZHANG Chao, WANG Hui-ping (Institute of Geoteclmical Engineering, Hunan University, Changsha 410082, China)
出处 《岩土工程学报》 EI CAS CSCD 北大核心 2013年第10期1849-1856,共8页 Chinese Journal of Geotechnical Engineering
基金 国家自然科学基金项目(51078137)
关键词 正交试验设计 土石混填体 直剪试验 剪切强度 含水率 含石量 剪应力-剪切位移曲线 orthogonal experimental design soil-rock aggregate mixture direct shear test shear strength water content rockcontent shear stress-shear displacement curve
作者简介 王江营(1985-),男,河南临颍人,博士研究生,主要从事土石混填体力学特性及岩土本构模型研究工作。E—mail:neimeng686@163.com。
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