渗透吸力对饱和黏土变形-强度特性的影响

摘要

The change in the composition or concentration of the pore solution will have an important effect on the strength characteristics of the soil.To solve this problem,triaxial consolidation drainage shear test is done on saturated clays with pore solution of different concentration of NaCl.The test results show that the osmotic suction has obvious effect on the deformation-strength characteristics of clay.Under the same confining pressure,the modulus and strength value of saturated clay are not monotonically decreasing with the increase of osmotic suction.Salt solution can change the clay pore status and structure,thus affecting the process of shearing deformation,soil strength and failure time during the shear process.The strength of the soil particles is also related to soil structure.%为了解孔隙溶液组分或浓度变化对土体强度特性产生的影响,进行了不同浓度NaCl溶液饱和黏土的三轴固结排水剪切试验,结果表明:渗透吸力对黏土的变形-强度特性有明显影响,同一围压下,饱和黏土变形模量值和强度值随渗透吸力的增加并不是单调降低的,而是先降后升.盐溶液侵蚀可以改变黏土的孔隙状态和结构,从而影响剪切过程中变形和强度及破坏时间,认为土体强度除了与土颗粒自身强度有关外,还与土体结构有关.