玄武岩残积红土的收缩特性试验研究

Experimental Study on the Shrinkage Characteristics of the Residual Soil of Basalt

为了研究土体收缩对土体开裂或者建筑物沉降的影响,通过四种不同干密度、两种不同含水率的原状残积红土与重塑土,采用收缩对比特性试验,结合收缩曲线和收缩指标拟合图分析玄武岩残积红土的收缩特性。结果表明:玄武岩残积红土的收缩与初始含水率、干密度有一定关系,且残积土失水收缩的过程也可分成四个阶段;不同含水率对应的收缩性指标均不一样,且收缩性指标与干密度关系几乎接近直线变化;玄武岩的收缩特性是由内因和外因共同作用的结果,并依据双电层理论来分析其内部收缩水分的迁移。研究结果为玄武岩残积红土用于工程实践提供参考。

In order to study the influence of soil shrinkage on soil cracking and building settlement ,undisturbed and re-molded residual soil of four different dry density and two different water content were selected for the shrinkage comparison tests .The fitting chart of the contraction curve and shrinkage index obtained from the tests were adopted to analyse the shrinkage characteristics of basalt residual soil .The results indicate that the shrinkage of the residual soil of basalt has a certain relationship with the initial water content and dry density , and the shrinkage process can be divided into four stages ;different water content corresponds to different shrinkage index ,and they are almost in a linear relationship ;the shrinkage characteristics of basalt is the result of the cooperation of internal and external causes based on the analysis of the migration of internal shrinkage water using double electric layer theory .These results will provide theoretical support for the engineering application of basalt residual soil .