不同固结应力条件下排土场粗粒土的三轴压缩试验

Jun Du, Zhiming Xiong, Xinggang Shen, Chao Wang, Jie Huang
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摘要

为探索不同固结应力条件下排土场粗粒土的力学响应特征,进行了不同围压条件下等压固结排水三轴试验和K0固结排水三轴试验,并对土的应力-应变和体积变形试验数据进行了对比分析。结果表明:K0固结条件下土体的初始应力不为零;不同固结条件下土体的剪应力-应变曲线表现出硬化特征。当围压增大时,等压固结土的剪应力迅速增大,其破坏剪应力较K0固结土显著增大。低围压条件下粗粒土的剪切膨胀和高围压条件下的剪切收缩。低围压下,K0固结土更容易发生剪切膨胀,且剪切膨胀量大于等压固结土。中高围压下,等压固结土的体积压缩变化大于K0固结土。不同固结应力条件下粗粒土的初始正切泊松比随围压的增大而减小,并随围压的增大呈幂函数变化。等压固结应力条件下土的黏聚力较大,而不同固结应力条件下土的内摩擦角差异较小。土的强度和变形特性与土的初始应力状态密切相关。土抗剪强度指标采用三轴试验,不应采用等压固结条件代替K0固结条件。
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Triaxial compression test of coarse-grained soil in waste dump under different consolidation stresses conditions
In order to explore the mechanical response characteristics of coarse-grained soil in waste dump under different consolidation stress conditions, the isobaric consolidation drained triaxial test and K0 consolidation drainage triaxial test under different confining pressures are performed, and the test data of stress-strain and volume deformation of soil are compared and analysed. The results show that the initial stress of soil under K0 consolidation condition is not zero. The shear stress-strain curves of soil with different consolidation conditions show hardening characteristics. When confining pressure increases, the shear stress of isobaric consolidated soil increases rapidly, and its failure shear stress increases significantly compared with K0 consolidated soil. Shear expansion of coarse-grained soil under low confining pressure and shear shrinkage under high confining pressure. Under low confining pressure, K0 consolidated soil is more prone to shear expansion, and the amount of shear expansion is greater than that of isobaric consolidated soil. Under medium and high confining pressure, the volume compression change of isobaric consolidated soil is greater than that of K0 consolidated soil. The initial tangent Poisson’s ratio of coarse-grained soil under different consolidation stress conditions decreases with the increase of confining pressure, and changes in a power function with the confining pressure. The cohesion of soil under isobaric consolidation stress condition, while the difference of internal friction angle of soil under different consolidation stress condition is small. The strength and deformation characteristics of soil are closely related to the initial stress state of soil. The triaxial test is used to obtain the shear strength index of soil, and the isobaric consolidation condition should not be used instead of K0 consolidation condition.
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