干湿循环下花岗岩残积土路堑边坡稳定性研究

干湿循环对花岗岩残积土抗剪强度有明显的影响,其会影响路堑边坡的稳定性.利用前人研究成果获得花岗岩残积土在干湿循环荷载作用下的抗剪强度变化规律,并利用数值软件PLAXIS研究考虑干湿循环条件下花岗岩残积土强度变化的路堑边坡稳定性特性,评估干湿循环对花岗岩残积土路堑边坡稳定性的影响.数值模型首先与前人研究成果进行比对获得了...

Research on the Cut Slope Stability of Granite Residual Soils under Wet and Dry Cycles

It has been proven that the stability of the cut slopes of granite residual soil are significantly influenced by wet and dry cycles which can decrease the shear strength of granite residual soil dramatically.In this paper,the results of previous studies are used to obtain the shear strength variation law of granite residual soil under dry-wet cycle load,and the numerical software PLAXIS is used to study the stability characteristics of the cutting slope considering the change of granite residual soil strength under dry-wet cycle conditions,and the effect of the dry-wet cycle on the stability of the cut slope of granite residual soil is evaluated.The numerical model is first compared with previous research results and it proves a good consistency,and then the system parameters analysis of the cutting slope of the granite residual soil strength change under the dry-wet cycle condition is carried out when considering the cycle number,initial cohesion,friction angle,initial slope angle,excavation slope angle and other factors.The research results show that the dry-wet cycle has a great influence on the stability of the cut slope of granite residual soil,which reduces the slope stability by about 10%~30%.The conclusions of this paper can provide theoretical guidance for the design and practice of granite residual soil cutting slope project.