含水率对高液限细粒土砾与粉质黏土抗剪强度影响比较研究

近年来,随着极端气候的变化,土石坝安全性问题日益突显。为了研究不同筑坝材料对土石坝安全的影响,利用应变直剪仪对粉质黏土和高液限细粒土砾土样在不同含水率和实施不同正应力下进行不排水不固结快剪试验,研究不同含水量和不同应力情况对土的抗剪强度的影响。试验结果表明,粉质黏土在最大干密度和最优含水率时抗剪强度最大,在最优含水率以前随含水率越大抗剪强度越大,在最优含水率以后随含水率越大抗剪强度越小;而高液限细粒土砾的含水量越大抗剪强度越小。

Comparative Study on the Influence of Moisture Content of Shear Strength of High Liquid Limit Fine Gravel Soil and Silty Clay

In recent years, as the change of extreme weather, earth dam safety problems increasing, in order to study the effect of different dam materials for earth dam safety, based on the strain direct shear apparatus of silty clay and high liquid limit fine grained soil gravel soil samples in different wa- ter content and implementation of different normal stress under undrained consolidated quick shear tests, research different water content and different stress conditions affect the shear strength of soil. Test results show that the silty clay in the maximum dry density and optimum moisture content when the shear strength is the largest, with the greater the moisture content before the optimal mois- ture content of shear strength is larger after the optimum moisture content with the moisture content, the greater the shear strength is smaller; The high liquid limit fine grained soil shear strength, the smaller the greater the moisture content of gravel.