重塑红棕色玄武岩残积土抗剪强度特性试验研究

摘要

红棕色玄武岩残积土属于强风化土,为了解其抗剪强度变化规律,对不同干密度、不同含水率的土样进行不固结不排水剪与固结不排水剪试验.试验结果表明:当含水率一定时,随着干密度的增加,土的抗剪强度增加;干密度一定时,随着含水率的增加,土的抗剪强度、黏聚力与内摩擦角均减小;经过固结后,土样的含水率较低时,主要通过提高黏聚力来提高抗剪强度;含水率较高时,则主要通过提高内摩擦角来提高抗剪强度.各条件下的试验所得抗剪强度指标可为工程设计提供参考.%Red brown basalt residual soil belongs to the strongly weathered soil,to understand the change law of shear strength.For different dry density and water content of soil sample are unconsolidated-undrained shear and consolidated-undrained shear test.Experimental results show that when the water content of a certain,with the increase of dry density,shear strength of soil increased.Dry density is constant,with the increase of water content,the shear strength of soil,cohesion and internal friction angle all decreases.After consolidation,the water content of soil sample is low,mainly by improving the cohesion to improve shear strength and the water content is higher,mainly by improving the internal friction angle to improve shear strength each test under the condition of shear strength indexes can be served as references for engineering.