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机构地区:[1]大连交通大学土木与安全工程学院,辽宁大连116028 [2]大连理工大学土木工程学院,辽宁大连116024
出 处:《大连理工大学学报》2011年第3期387-392,共6页Journal of Dalian University of Technology
基 金:国家自然科学基金资助项目(50679015)
摘 要:采用GDS三轴仪试验系统对膨润土加砂混合物进行了饱和与非饱和状态下三轴固结排水剪切试验研究.试验结果表明非饱和状态下膨润土加砂混合物的应力应变关系曲线与饱和状态下混合物的应力应变关系曲线具有相似的形态,均为硬化型.随着基质吸力或净围压力的增加,最大偏应力均增大.试样发生鼓状破坏,并且无明显破坏带.非饱和状态下膨润土加砂混合物的有效内摩擦角与饱和状态下的相近.随着基质吸力的增加,膨润土加砂混合物的总黏聚力增加,体现了基质吸力对抗剪强度的贡献,两者之间的关系可以采用含有非线性系数的关系式进行较好的表达,进一步得到了非饱和状态下膨润土加砂混合物的抗剪强度公式.Studies on consolidated drained triaxial tests for bentonite-sand mixtures under saturated and unsaturated states are presented by utilizing GDS triaxial test system.Experimental results indicate that stress-strain curves of unsaturated bentonite-sand mixtures are similar to the curves of saturated bentonite-sand mixtures,which are hardening curves.Maximum deviatoric stress increases as matrix suction or net confining pressure increases.For all test samples,barrel deformation happens and no obvious shear failure area exists.Effective internal friction angles of bentonite-sand mixtures in two states are approximately equal.Total cohesion increases as matrix suction increases,which shows the influence of matrix suction on shear strength of mixtures.The relationship of total cohesion versus matrix suction can be denoted by the equation with nonlinear coefficient well.Then,a shear strength equation is obtained for unsaturated bentonite-sand mixtures.
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