平面应变条件下原状黄土侧向卸载变形与强度特性分析
发布时间：2018-10-25 06:27
【摘要】：基于平面应变改造后的西安理工大学真三轴仪,在不同围压条件下对不同含水率黄土进行了侧向卸载平面应变试验,研究了平面应变条件下原状黄土的卸载强度、变形特性以及原状黄土的破坏方式。研究结果表明:不同固结围压条件下,各含水率原状黄土的侧向卸载应力-应变曲线均为硬化型,近似呈理想塑性曲线。剪切过程中,黄土的侧向与竖向变形呈非线性变化,侧向应变的发展要快于竖向应变,体积变形均为体胀。侧向卸载条件下土的破坏应变要比平面应变竖向加载和常规三轴试验小得多。黄土的卸载破坏强度与含水率、围压和球应力状态密切相关;随着含水率的增大,黏聚力衰减明显,内摩擦角略有减小。侧向卸载条件下,原状黄土呈剪胀滑移破坏形式。
[Abstract]:Based on the true triaxial instrument of Xi'an University of Science and Technology after plane strain transformation, the lateral unloading plane strain test of loess with different moisture content was carried out under different confining pressure, and the unloading strength of undisturbed loess under plane strain was studied. Deformation characteristics and failure mode of undisturbed loess. The results show that under different consolidation confining pressures, the lateral unloading stress-strain curves of loess with different moisture content are of hardening type and approximate ideal plastic curves. In the shear process, the lateral and vertical deformation of loess show a nonlinear change, the lateral strain develops faster than the vertical strain, and the volume deformation is bulky. The failure strain of soil under lateral unloading is much smaller than that under vertical loading of plane strain and conventional triaxial test. The unloading failure strength of loess is closely related to water content, confining pressure and spherical stress, and the cohesion decreases obviously with the increase of water content, and the angle of internal friction decreases slightly. Under the condition of lateral unloading, the undisturbed loess is in the form of shear expansion and slip failure.
【作者单位】： 西安工业大学建筑工程学院;
【基金】：西安工业大学校长基金项目(No.XAGDXJJ16018)~~
【分类号】：TU444
[Abstract]:Based on the true triaxial instrument of Xi'an University of Science and Technology after plane strain transformation, the lateral unloading plane strain test of loess with different moisture content was carried out under different confining pressure, and the unloading strength of undisturbed loess under plane strain was studied. Deformation characteristics and failure mode of undisturbed loess. The results show that under different consolidation confining pressures, the lateral unloading stress-strain curves of loess with different moisture content are of hardening type and approximate ideal plastic curves. In the shear process, the lateral and vertical deformation of loess show a nonlinear change, the lateral strain develops faster than the vertical strain, and the volume deformation is bulky. The failure strain of soil under lateral unloading is much smaller than that under vertical loading of plane strain and conventional triaxial test. The unloading failure strength of loess is closely related to water content, confining pressure and spherical stress, and the cohesion decreases obviously with the increase of water content, and the angle of internal friction decreases slightly. Under the condition of lateral unloading, the undisturbed loess is in the form of shear expansion and slip failure.
【作者单位】： 西安工业大学建筑工程学院;
【基金】：西安工业大学校长基金项目(No.XAGDXJJ16018)~~
【分类号】：TU444
【相似文献】
相关期刊论文 前10条
1 孙明星;党进谦;康顺祥;;原状黄土单轴抗拉特性研究[J];水利与建筑工程学报;2006年03期
2 陈存礼;何军芳;高鹏;;不同含水量下原状黄土的动力变形特性[J];西安理工大学学报;2006年04期
3 陈存礼;高鹏;何军芳;;考虑结构性影响的原状黄土等效线性模型[J];岩土工程学报;2007年09期
4 陈存礼;何军芳;杨鹏;;考虑结构性影响的原状黄土本构关系[J];岩土力学;2007年11期
5 王辉;岳祖润;叶朝良;;原状黄土及重塑黄土渗透特性的试验研究[J];石家庄铁道学院学报(自然科学版);2009年02期
6 万战胜;杨U，
本文编号：2292893
本文链接：https://www.wllwen.com/jianzhugongchenglunwen/2292893.html
