STRESS HISTORY EFFECTS ON DYNAMIC MODULUS OF CLAY
STRESS HISTORY EFFECTS ON DYNAMIC MODULUS OF CLAY
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应力历史对粘土动态模量的影响
DOI：
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发表时间：
1968
期刊：
影响因子：
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通讯作者：
H. Wahls
中科院分区：
文献类型：
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作者：
W. Humphries;H. Wahls
重塑的高岭土和膨润土三轴试件承受10psi到100psi的各向同性固结压力和1到10的超固结比。每个试件的顶部分别施加0.00015、0.0003和0.0006弧度的稳态扭转振动，并通过共振柱技术测定动态剪切模量。在所用的振幅范围内，随着振幅的增加，剪切模数下降不到5%。应激史效应要显著得多。两种土的剪切模量值均随孔隙比的减小和有效压力的增大而增大。在正常固结条件下，高岭土和膨润土的剪切模量值分别约为有效压力的1/2和2/3次方。对于超固结高岭石，回归分析表明，剪切模量值与孔隙率和有效压力有关。对于超固结膨润土，剪切模数主要受孔隙率的影响。对于每种土，正常固结状态和超固结状态的剪切模数都可以从一个方程中预测出来。
Remolded kaolinite and bentonite triaxial specimens were subjected to isotropic consolidation pressures of 10 psi to 100 psi and overconsolidation ratios of 1 through 10. Steady-state torsional vibrations with amplitudes of 0.00015, 0.0003, and 0.0006 radians were applied to the top of each specimen, and the dynamic shear modulus was determined by resonant-column techniques. Shear moduli decreased less than 5% with increasing amplitude for the range of amplitudes used. Stress history effects were much more significant. For both soils, the shear modulus increased with decreasing void ratio and increasing effective pressure. For normally consolidated conditions, the shear modulus increased approximately with the 1/2 and 2/3 power of effective pressure for kaolinite and bentonite, respectively. For overconsolidated kaolinite, regression analysis indicated the shear modulus depends on both void ratio and effective pressure. For overconsolidated bentonite, the shear modulus is predominantly influenced by void ratio. For each soil, the shear modulus for both normal and overconsolidation states can be predicted from one equation.