干湿循环作用下高液限黏土抗剪强度试验研究

Study on Shear Strength Test of High Liquid Limit Clay under Dry-wet Cycles

高液限粘土是一种不良土质,在我国南方多雨地区非常常见,采用高液限粘土填筑库区路基是公路建设过程中常见的技术问题之一。以不同次数的增湿和烘干过程模拟干湿循环条件,并对这种模拟下的高液限黏土在自主研发的大型直剪仪上不同垂直压力下进行直剪试验,得到0～5次干湿循环条件下高液限粘土的强度参数值,分析出在5次干湿循环后粘聚力和内摩擦角各自衰减54%和26%基本趋于稳定。

High liquid limit clay is a kind of bad soil,which is very common in wet areas south of China. It＇s one of the common technical problems in highway construction process for using high liquid limit clay filling the reservoir embankment. Change the times of humidifying and drying process to simulate wet and dry cycling conditions by the large-scale direct shear apparatus of independent research and development. And conduct direct shear tests under different vertical pressures in this dry-wet simulation of high liquid limit clay to get different strength parameters of high liquid limit clay under 0 to 5 times of dry-wet cycles. The cohesion and internal friction angle respective attenuation 54% and 26% to become basically stable after five times of dry-wet cycles.