南京下蜀土结构强度研究

利用常规三轴试验，研究了南京下蜀土结构强度及其影响因素。结果表明，下蜀土存在明显的结构性。当应变小于屈服应变时，土体的结构强度迅速的发挥;当应变大于屈服应变时，土体结构发生破坏，结构强度逐渐降低;最终当各个结构单元重新排列稳定时，土体结构完全被破坏。讨论了围压和含水量对结构强度的影响，结果表明南京下蜀土土体的结构强度和围压无关，和含水量有良好的幂函数关系。结构强度与非饱和土中吸附强度有一定的关系，可以用结构强度代替吸力，从而简化非饱和土抗剪强度公式。
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STUDY ON THE STRUCTURAL STRENGTH OF XIASHU |SOIL IN NANJING

This paper uses the results of standard soil triaxial tests to examine the structural and impaction factor of Xiashu  soil  in Nanjing. The results show that the Xiashu soil evidently has structures. . Before the yield strain, the structural strength of the soil quickly is developed. After the yield strain, the soil  structure is broken. When every structural unit is re-arranged to form a stable structure, the original soil structure  is totally destroyed. The impaction factors are  confining pressure and moisture content. The result shows that the structure strength  does not vary with the change of the confining pressure.  A power function  is found for the relationship between the structure strength and the moisture content. At last, the paper discusses the possibility of using structure strength  to replace the matrix suction strength.