天津软黏土触变特性研究

STUDY ON THIXOTROPIC PROPERTIES OF TIANJIN SOFT CLAY

软黏土的触变性对于实际工程设计和施工具有重要意义。为了分析天津地区软黏土触变性,本文基于正交试验研究了含水率、矿粉含量和pH值对其十字板强度和触变强度比率等指标的影响。试验结果表明:影响天津软黏土触变强度比率的主次因素依次为含水率、矿粉含量、pH值;软黏土的触变强度比率随含水率的增大而呈指数增大;随矿粉含量增大而呈接近线性减小;随pH值的增大而增大,但其增加幅度逐渐降低,且碱性比酸性环境更有利于软黏土强度的恢复;通过回归分析,建立了包含含水率、矿粉含量、pH值3个因素的天津软黏土触变强度比率预测公式,据此预测触变强度,预测结果较好。研究成果能够为工程实践提供理论参考。

The thixotropy of soft clay is of great significance for engineering design and construction.In order to analyze the thixotropy of soft clay in Tianjin area,this paper studies the influence of water content,mineral powder content and pH value on the strength and thixotropic strength ratio of the cross plate based on the orthogonal experiment.The test results show that water content,mineral powder content and pH value are the primary and secondary factors affecting the thixotropic strength ratio of Tianjin soft clay.The thixotropic strength ratio of soft clay increases exponentially with the increase of water content,decreases almost linearly with the increase of mineral powder content,and increases with the increase of pH value.But the increasing range gradually decreases.Alkaline is more conducive to the recovery of soft clay strength than acidic environment.By means of regression analysis,a prediction formula for the thixotropic strength ratio of Tianjin soft clay is established.The formula includes water content,mineral powder content and pH value,and predicts the thixotropic strength.The prediction results are better.The research results can provide theoretical reference for engineering practice.