剪切速率对环形桩孔抗剪强度的影响  

Effect of shear rate on shear strength of annular pile holes

作　　者：江亮 范登政 JIANG Liang;FAN Deng-zheng(School of Civil Architecture,Anhui University of Science&Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《河南城建学院学报》2021年第1期32-36,共5页Journal of Henan University of Urban Construction

基　　金：高校博士点专项基金资助项目(200803610004)。

摘　　要：为了研究环状桩孔的力学性质,以某矿风井检查孔的黏土为研究对象,采用智能电动四联直剪仪进行了室内直剪试验,探讨了剪切速率对黏土剪应力-剪切位移曲线的影响,分析了内摩擦角、黏聚力随剪切速率的变化关系。试验结果表明:剪应力随着剪切速率的增加而增加,黏聚力、内摩擦角与剪切速率的关系可以通过一元二次多项式来拟合,提出了抗剪强度与剪切速率、竖向压力的两元回归计算模型。In order to study the mechanical properties of annular pile borehole,an indoor direct shear test was conducted with an intelligent electric quadruple direct shear instrument using clay soil of a mine air shaft inspection hole,and the effect of shear rate on shear stress-shear displacement curve of clay soil was investigated,and the relationship between internal friction angle and cohesion with shear rate was analyzed.The test results show that the shear stress increases with the increase of shear rate,the relationship between cohesion,internal friction angle and shear rate can be fitted by a quadratic polynomial,and the two-element regression calculation model of shear strength with shear rate and vertical load is proposed.

关 键 词：剪切速率 剪应力 竖向压力 黏土 桩孔 

分 类 号：TU411[建筑科学—岩土工程]