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中文摘要：
为研究深部巷道破裂围岩强度衰减规律,设计模拟巷道破裂区应力演化规律的应力路径,采用MTS815岩石力学伺服试验机对完整的砂质泥岩试样进行加卸载试验,得到不同损伤程度的初始损伤岩样;通过单试件法对初始损伤岩样在不同围压下的三轴强度特性进行试验研究。采用卸载点的应力减低比D、体积膨胀比DV作为损伤变量,分别建立损伤岩样峰值强度及强度参数与二者的函数关系,研究成果表明,初始损伤岩样的峰值强度、黏聚力与内摩擦角随损伤程度的增大大幅减小,且呈指数衰减规律。
英文摘要：
In order to study the strength degradation law of surrounding rock in fractured zone of deep roadway, the loading-unloading tests on intact sandy mudstone samples were implemented according to the stress path simulating the changing law of stress in fractured zone of roadway by applying the MTS815 servo-controlled rock mechanics testing machine. The initial damaged rock samples for different broken levels were obtained and their triaxial strength characters under varying confining pressures were tested with single block method. The strength degradation ratio Dσ and volume expansion ratio Dv were applied as damage valuables at unloading point： and the function relationships between peak strength, strength parameters of initial damaged rock samples and Dσ, Dv were established. The study results indicate that the peak strength, cohesion and internal friction angle decrease greatly with the increasing broken level in exponential degradation law.
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