水-土化学作用的力学效应及机理分析

通过水 土反应物理力学效应的实验 ,探讨了水 土反应的正力学效应和负力学效应 .结果表明 ,同一种土在不同水溶液或不同的状态浸泡下 ,其水 土化学反应后的液限和塑限不同 ,并存在着正负两个方向的力学效应 :纯水或KNO3溶液使土的液塑限及塑性指数增大 ,而Ca(OH) 2 和K2 CO3溶液交替浸泡会使土的液塑限及塑性指数较大幅度的减小 .进而对水 土反应的力学效应机理进行了分析 ,认为具有力学效应的水化学反应主要有溶蚀作用、沉淀或结晶作用和阳离子交替吸附作用 3种 ,并分别对其进行了探讨 .最后认为通过水与土的化学反应可以调整土的物理力学性质 ,从而改良土质 ,防治环境地质灾害

Mechanical Effect of Chemical Action of Water on Soil and Analysis on Its Mechanism

Researching the mechanical effects of chemical action of water-soil on soil is of great importance to geoenvironmental hazard control.The texture of soil and the fabric of soil mass are set forth.Tests on physical and mechanical property are performed to investigate the mechanism of the positive and negative mechanical effects of different chemical property of aqueous solution.The results make clear that the plastic limit, liquid limit and plasticity index are changed, and there exist both positive and negative effects on specimens in this test.Based on the analysis of the mechanism of the mechanical effects of water-soil interaction on soil, it could be estimated that hydrochemical actions being provided with mechanical effects on soil include dissolution, sedimentation or crystallization. The significance of these tests lie in which it is recognized for us that we may improve, adjust and control the quality of soils, and may achieve the goal of geological hazard control and prevention.