干湿循环作用下云母片岩力学特性试验研究

针对鄂西北地区云母片岩,开展了干湿循环条件下云母片岩单轴压缩试验,研究了云母片岩强度与变形参数随干湿循环次数增加的变化规律。结果表明:随着干湿循环次数的增加,云母片岩强度、割线模量逐渐降低,泊松比变化较小,抗压强度、割线模量与循环次数分别呈对数、线性相关。干湿循环达到一定次数后,云母片岩被水完全浸透,致使强度和割线模量损伤出现拐点。

Experimental Study on Mechanical Properties of Mica Schist under the Action of Wetting-Drying Cycle

For the mica schist in the northwestern area of Hubei,uniaxial compression test was carried out under the condition of wetting-drying cycle,by which the law of the rock strength and deformation parameters changing with the cycle times was studied.The result shows that,as the times of wetting-drying cycle increases,the mica schist’s strength and secant modulus decrease gradually,the poisson’s ratio has minor variation,as well as the compressive strength and secant modulus have logarithmical and linear relation to the cycle times,respectively.When reaching certain cycle times,the mica schist is saturated completely by water,leading to inflection point on the strength and secant modulus damage.