平面應(yīng)變條件下原狀黃土側(cè)向卸載變形與強度特性分析
發(fā)布時間：2018-10-25 06:27
【摘要】：基于平面應(yīng)變改造后的西安理工大學(xué)真三軸儀,在不同圍壓條件下對不同含水率黃土進行了側(cè)向卸載平面應(yīng)變試驗,研究了平面應(yīng)變條件下原狀黃土的卸載強度、變形特性以及原狀黃土的破壞方式。研究結(jié)果表明:不同固結(jié)圍壓條件下,各含水率原狀黃土的側(cè)向卸載應(yīng)力-應(yīng)變曲線均為硬化型,近似呈理想塑性曲線。剪切過程中,黃土的側(cè)向與豎向變形呈非線性變化,側(cè)向應(yīng)變的發(fā)展要快于豎向應(yīng)變,體積變形均為體脹。側(cè)向卸載條件下土的破壞應(yīng)變要比平面應(yīng)變豎向加載和常規(guī)三軸試驗小得多。黃土的卸載破壞強度與含水率、圍壓和球應(yīng)力狀態(tài)密切相關(guān);隨著含水率的增大,黏聚力衰減明顯,內(nèi)摩擦角略有減小。側(cè)向卸載條件下,原狀黃土呈剪脹滑移破壞形式。
[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.
【作者單位】： 西安工業(yè)大學(xué)建筑工程學(xué)院;
【基金】：西安工業(yè)大學(xué)校長基金項目(No.XAGDXJJ16018)~~
【分類號】：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.
【作者單位】： 西安工業(yè)大學(xué)建筑工程學(xué)院;
【基金】：西安工業(yè)大學(xué)校長基金項目(No.XAGDXJJ16018)~~
【分類號】：TU444
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