含超径颗粒土石混合体的大型三轴剪切试验研究

发布时间：2018-03-22 12:39

本文选题：土力学　切入点：土石混合体　出处：《岩石力学与工程学报》2017年08期 　论文类型：期刊论文

【摘要】：为研究土石混合体在含超径颗粒情况下的力学响应,利用大型三轴剪切试验仪,分别对体积含石量为25%,35%的非常规土石混合体试样在3种不同围压条件下进行固结不排水剪切试验。试验结果显示:含超径颗粒土石混合体在不排水剪切条件下仍然存在体积变化;含石量35%的土石混合体在围压较高情况下,体应变表现为加载初期剪缩,随后剪胀,二次剪缩,再次剪胀的特征;含石量25%的土石混合体的应力应变曲线较为平滑,但含石量在35%的情况下,应力应变曲线则呈现锯齿状特征,且伴随着间接性的应力跳跃现象,相应的体应变、孔隙水压力也出现跳跃现象,且与试样的应力变化具有很好的对应关系。
[Abstract]:In order to study the mechanical response of soil-rock mixture with super-diameter particles, a large triaxial shear tester was used. The undrained shear tests of unconventional soil-rock mixture samples with 25% volume rock content were carried out under three different confining pressures. The test results showed that the undrained shear condition of the mixture containing super-diameter particles was still under the condition of undrained shear. However, there is a volume change; In the case of high confining pressure, the bulk strain of the mixture with 35% rock content is characterized by initial shear shrinkage, then dilatation, secondary shear shrinkage, and reshear expansion, and the stress-strain curve of the mixture with 25% rock content is relatively smooth. However, when the rock content is 35%, the stress-strain curve is serrated, and accompanied by the indirect stress jump phenomenon, the corresponding bulk strain and pore water pressure also appear jump phenomenon. And it has a good correspondence with the stress change of the specimen.
【作者单位】：中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室;中国科学院大学;
【基金】：国家自然科学基金重点资助项目(41330643) 中国科学院科技服务网络(STS)计划项目(KFJ-EW-STS 094);中国科学院战略性先导科技专项(B类)课题项目(XDB10030100)~~
【分类号】：TU43

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