Strength Evolution Law and Mechanism Analysis of Red Sandstone Subgrade Soil Under Wetting-drying Cycles

Zhiyong Wang, Qun Luo, Bo Liang, Yingjun Mei, Tianxiong Dong, Jinqiu Pan, Meng Yan
2018 DEStech Transactions on Engineering and Technology Research  
The unconfined compression strength of red sandstone subgrade filling soil after wetting and drying cycles for 6 times was tested by using a self-designed wettingdrying cycle device with compaction of 93% and 95%, and a cement content of 0~7% (0, 3%, 5% and 7%). According to the test results, the strength evolution law of plain soil, cement-modified red sandstone roadbed filling is analyzed: For plain soil, strength is lost under one cycle of wetting and drying; For cement-modified soil, the
more » ... dified soil, the greater compaction and the higher cement content, the smaller strength loss under wetting-drying cycles. In addition, The strength effect mechanism of dry wet cycles on cement stabilized red sandstone subgrade fill is analyzed. Under wettingdrying cycles, the strength change of cement-soil can be divided into three stages: The strength decay stage, Strength increased slightly stage and strength attenuation stage. 1
doi:10.12783/dtetr/iccere2017/18299 fatcat:gdnjequ7e5atlcm3zuq7h5edre