斥水土在不同含水率下抗剪强度参数变化规律研究

Study on shear parameter variations of water-repellent red clay under different water contents

利用十八烷基伯胺(CH3(CH2)16CH2NH2)作为斥水剂对红黏土进行化学改性,使亲水土变为斥水土。采用不同围压、含水率进行三轴固结不排水试验(CU试验)研究斥水土强度变化,亲水土作为对照组,并将抗剪参数拟合。当土壤饱和度在50%~90%时,拟合得到2种土含水率与抗剪参数近似函数关系。试验结果表明斥水土抗剪强度参数变化受含水率影响相较于亲水土不明显,故边坡在强降雨时斥水土可增加其稳定性。

Octadecyl primary amine(CH3(CH2)16CH2NH2)is used as a water repellent to chemically modify the soil,so as to change the hydrophilic soil into the hydrophobic soil.The triaxial consolidated undrained tests(CU test)with different confining pressure and water content are used to study the change of the strength of the water repellent soil.The water repellent soil is used as the control group,and the shear parameters are fitted.When the soil saturation degree is 50%~90%,the approximate functional relationship between water content and shear parameters of the two kinds of soil is fitted.The test results show that the change of shear strength parameter of water-repellent soil is not significantly affected by water content compared with hydrophilic soil,so the slope can be stabilized by water-repellent soil during strong rainfall.