岩土工程学报2011，Vol.33Issue(1)：150-158,9.
复杂应力条件下原状饱和海洋黏土孔压与强度特性
Characteristics of pore water pressure and strength of undisturbed saturated marine clay under complex stress conditions
摘要
Abstract
The apparatus for static and dynamic universal triaxial and torsional shear soil tests is employed to perform stress-controlled coupling vertical and torsional shear tests under different three-dimensional initial anisotropic consolidation stress conditions.Through experimental tests the effects of the initial orientation angle of the major principal stress, the ratio of the two stress components and the cyclic stress level on the pore water pressure and the strength of the saturated marine clay are examined.The initial orientation angle of the major principal stress has a significant influence on the characteristics of pore water pressure: as the angle increases, both the residual pore water pressure and the amplitude of fluctuated pore water pressure increase.Meanwhile, the relations between the normalized residual pore water pressure ratio and the cyclic number ratio with different initial orientation angles of the major principal stress are established.Under the conditions of keeping the area bounded by the elliptical stress path unchanged, there exists a certain critical value for the ratio of the axial and torsional shear stresses.At this critical value, the residual pore water pressure is the lowest.Both the fluctuated pore water pressure and the residual pore water pressure increase with increasing cyclic stress ratio.However, there is great difference between the high and the low stress levels.Furthermore, the critical cyclic stress ratio is determined according to the time history curves of pore water pressure under different cyclic stress ratios.The initial orientation angle of the major principal stress has a significant influence on the dynamic strength: as the angle increases, the dynamic strength decreases.The dynamic strength curve indicates that there is basically a linear relationship between the cyclic stress ratio and the logarithm of the cyclic number required at failure.关键词
非均等固结/双向耦合循环剪切/循环应力水平/孔压/强度/临界值Key words
anisotropic consolidation/ bi-directional cyclic shear/ cyclic stress level/ pore water pressure/ strength/ critical value分类
建筑与水利引用本文复制引用
栾茂田,刘功勋,郭莹,王忠涛..复杂应力条件下原状饱和海洋黏土孔压与强度特性[J].岩土工程学报,2011,33(1):150-158,9.基金项目
国家自然科学基金项目(50909014) （50909014）
国家自然科学基金重点项目(50639010) （50639010）
