干湿循环作用下岩石力学性质的实验研究

Experimental study on mechanical properties of rock under the conditions of wet and dry cycles

为了模拟风化作用对岩石力学特性的影响。利用MTS815岩石力学测试系统,实验研究了岩石在干湿循环条件下的变形与力学特性,得出:岩石应力应变全过程曲线可分为四个阶段:即初始压密阶段、弹性阶段、应变硬化阶段、应变软化阶段;随干湿循环次数的增加,试件的变形增大;干湿循环作用下,岩石的单轴抗压强度、弹性模量、E50模量减小,且与干湿循环次数呈对数函数关系。研究成果为岩石工程设计与保护具有重要的理论和工程实际意义。

In order to simulate the influence of the weathering to the rock mechanics characteristics.This paper experimental studied the deforming and mechanical properties of rocks in the dry and wet cycles conditions by using MTS815 rock stress test system.Obtained： rock stress-strain curves of the whole process can be divided into four stages： the initial compaction stage,the elastic stage,the strain hardening stage,strain softening stage;The more cycles of wet and dry,the bigger of the deforming of specimen;Under the effection of dry and wet cycles,the uniaxial compressive strength,modulus of elasticity,modulus of E50 became smaller;and all these element have a logarithm fuction realationgship with dry and wet cycles.Research results have important thory and practical significance for the rock engineering design and protection.