黄土的增湿剪切变形特性试验研究  

Experimental Study on the Shear Deformation Characteristics of Wetted Loess Samples

作　　者：毕庆涛[1] 曹艳慧 赵坤 范肖肖 BI Qingtao;CAO Yanhui;ZHAO Kun;FAN Xiaoxiao(North China University of Water Resources and Electric Power,Zhengzhou 450046;Jinan Land Acquisition and Comprehensive Renovation Service Center,Jinan 250000)

机构地区：[1]华北水利水电大学,郑州450046 [2]济南市土地征收和综合整治服务中心,济南250000

出　　处：《土工基础》2024年第2期342-345,共4页Soil Engineering and Foundation

基　　金：山西省交通运输厅科技项目(2018-1-30)。

摘　　要：力、水作用路径是揭示黄土湿陷变形特性的重要方面。利用改装后的应力控制式直剪仪,采用增湿试验路径,分析在应力作用不变的前提下,水作用变化引起的黄土剪切变形,探讨黄土的增湿剪切变形特性。开展了不同法向压力、剪应力和干密度条件下的增湿剪切试验。试验结果表明,当应力和增湿的水量组合值达到某一个特定数值时土样才会趋于破坏;相同法向压力下,剪应力数值较小时,土样不会出现增湿剪切破坏;剪应力大于某一值时,当土样内部的含水率达到某个特定数值时,试样便趋于破坏;相同应力条件下,干密度较小的土样其增湿剪切位移随增湿含水率的变化高于干密度较大的土样。The stress path and the moisture content are the important aspects that governing the deformation characteristics of the collapsibility of loess samples.A modified stress-controlled direct shear device was used to analyze the shear deformation of the loess caused by the change of moisture content under the condition of the constant stress,and the wetted shear deformation characteristics of loess were discussed.Wetted shear tests under different normal pressures,shear stresses and dry densities were carried out.The results show that the soil sample tends to fail when the combined value of the stress and the amount of water used for the moisture content reaches a certain value.Under the same normal pressure,when the shear stress value is small,the soil sample will not have a wetted shear failure mode.When the shear stress is greater than a certain value,the sam-ple tends to fail when the moisture content inside the soil sample reaches a certain value.Under the same stress conditions,the change of the wetted shear displacement with the wetting moisture content of soil samples with a low dry density was higher than that of soil samples with a higher dry density.

关 键 词：黄土 增湿剪切变形 作用路径 应力控制式直剪 直剪试验 

分 类 号：TU411[建筑科学—岩土工程]