含水率对泾阳Q2黄土剪切及蠕变影响研究  

Effect of Moisture Content on the Shear Strength and the Creep Properties of Jingyang Q2 Loess

作　　者：李凯 LI Kai(School of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054)

机构地区：[1]西安科技大学地质与环境学院,西安710054

出　　处：《土工基础》2020年第3期339-341,共3页Soil Engineering and Foundation

基　　金：国家自然科学基金青年基金项目,项目编号41602359。

摘　　要：黄土含水量变化引起的抗剪强度及黄土蠕变与黄土边坡稳定性密切相关。通过室内直剪及蠕变试验,研究了含水率、干密度及法向压力等对非饱和Q2黄土的剪切强度及长期强度的影响。结果表明:对比不同干密度下含水率为10%和18%的黄土,发现后者抗剪强度较前者弱化均在20%以上;含水率的增大对黏聚力也产生了弱化效应,且随干密度有增大弱化更严重的趋势;黄土蠕变阶段表现出典型的初始衰减蠕变、稳态蠕变及加速蠕变阶段;含水率的降低,干密度的增大都将使蠕变阶段变形降低;通过拟合,发现泾阳Q2黄土的蠕变符合对数函数曲线变化规律。The issue of loess intensity has always been a hot topic in the study of geotechnical scholars.The shear strength and loess creep caused by the change of water content are closely related to the stability of loess slope.Through direct shear and creep tests,the effects of water content,dry density and normal pressure on shear strength,and long-term strength of unsaturated Q2 loess are studied.The results show that compared with the strength of loess with 10%and 18%moisture content under different dry densities,18%shear strength weakens more than 20%compared with 10%;The increase of water content also has a weakening effect on the viscous force,and there is a more serious tendency to weaken with the increase of dry density;The creep will be caused by the decrease of water content and the increase of dry density;By fitting,it is found that the creep of loess conforms to the law of logarithmic function curve.

关 键 词：泾阳黄土 峰值抗剪强度 直剪蠕变 拟合 

分 类 号：TU411[建筑科学—岩土工程]