用固体力学化学理论研究岩土的力学化学行为——以成都龙泉紫色土为例

根据固体力学化学理论 ,提出用化学动力学方法研究岩土破坏及滑坡形成的机理 ,并以成都龙泉紫色土为例研究了在力与水协同作用下易滑土层的力学化学行为。实验表明 ,土长期抗剪强度降低的幅度与溶液的pH值有关 ,土的溶解速度与易溶盐含量有关 ,且溶解曲线略呈“S”型。这初步证明了龙泉紫色土破坏的力学 化学效应及其可能存在的自催化趋势。通过实验了解了力与水协同作用导致土破坏的力学化学规律 ,并将定量求解滑面长期抗剪强度与反应机理研究结合起来 ,为定量评价地下水和应力对岩土破坏机理这一滑坡学关键问题打下基础。

Application of solid mechanochemistry theory to the behavior of soil: taking Longquan purple soil as an example

This paper applies the method of chemical dynamics to the study of soil failure and machanism of landslide formation, and takes Longquan purple soil as a case to study the mechanochemical behavior of the soil layer which have trend to slide under the cooperative action of the stress and water. Experiments show that, the decrease of residual shear strength of soil depends upon the pH value of solution; the dissolution velocity of soil relates to the salt content and dissolution curves show a S shaped autocatalytic charaoteristics. which roughly confirms the possible being of autocatalytic tendency in mechnochemical behavior of failure of Longquan soil. Based on the experiments, the mechnochamical law of soil failure under coaction of stress and water is understood, and combination of solving residual shear strength of sliding surface with researching response mechanism laps the foundation for quantitative assessment of effects of underground water on destructive mechanism of soil