中文摘要：

对贵阳红黏土以击实法进行重塑样制备,设计不同含水量下的三轴不固结不排水试验,采用特雷斯卡（Tresca）准则和p-q曲线的方法求取抗剪强度指标,建立了贵阳重塑红黏土的抗剪强度与含水量之间的函数关系,并分析了其抗剪强度随含水量变化的机理。结果表明,贵阳重塑红黏土的破坏形式随含水量的减小由鼓胀破坏逐渐过渡为剪切破坏;不排水抗剪强度随含水量的增大呈二次函数减小,黏聚力和内摩擦角随含水量的增大呈阶梯式减小。研究认为,贵阳重塑红黏土呈现出这样的水敏性主要与它的成分和结构密切相关,即贵阳重塑红黏土的游离氧化铁主要以结晶态赋存,与颗粒中的结合水形成水胶联结,颗粒间孔隙大,水在颗粒表面起到了强烈的润滑作用,导致含水量增大的情况下强度迅速降低。

英文摘要：

Using the compaction method for preparing the remolded red clay samples, this article designs undrained triaxial tests of different water contents, use the Tresca criterion and p-q curve method to calculate the shear strength index. The function between shear strength of the remodeled red clay and water content is established, and the mechanism of the shear strength changes with water content is also analyzed. The results show that the damage form of the remodeled red clay with the reduction in water content is from the ballooning excessive damage to the shear failure. The undrained shear strength with increasing water content is a reduced quadratic function, and the cohesion and internal friction angle with increasing water content is a reduced stepwise. The remodeling red clay shows the water-sensitivity which is mainly closely related to its composition and structure. That is, the free iron oxide of the remodeled red clay mainly occurs as amorphous, with the combined water in the particles to form water glue connection, large pores between particles. In the particle, surface water plays a strong lubrication, leading to a quick shear strength decrease with the increasing water content.