水泥掺量对红粘土固结体抗剪特性影响的试验研究

Experimental Study on the Effect of Cement Content on the Shear Behavior of Red Clay Consolidation

为探讨水泥掺量对红黏土固结体抗剪强度特性的影响规律,本文以大掺量水泥对红黏土固结体抗剪强度指标的影响为切入点,室内制备了四种不同水泥掺入比的红黏土固结体试块,开展了不同法向应力条件下的红黏土水泥固结体直接剪切试验。试验发现:随着水泥掺量的不断增大,红黏土固结体的剪应力-剪位移关系曲线上峰值应力跌落现象逐渐显现;红黏土固结体抗剪强度指标随水泥掺量的增大而提高,但是粘聚力与内摩擦角的增大规律并不相同:粘聚力的增大速率随水泥掺量的增大而不断减小,内摩擦角的增大规律随水泥掺量的增大而呈“S”型。

In order to investigate the influence of cement content on the shear strength of red clay consolidation,this paper takes the influence of high-content cement on the shear strength index of red clay consolidation as the starting point,and four different cement incorporations are prepared indoors.The direct shear test of red clay cement consolidation under different normal stress conditions was carried out on the red clay consolidation test block.It is found that with the increasing amount of cement,the peak stress drop phenomenon on the shear stress-shear displacement curve of red clay consolidated body gradually appears;The shear strength index of red clay consolidated body increases with the increase of cement content,but the cohesion and internal friction angle increase are not the same:The rate of increase of cohesive force decreases with the increase of cement content,and the law of increase of internal friction angle is “S” type with the increase of cement content.