煤岩体压裂损伤突变演化模型的研究

Study on Damage Mutation Evolution Model of Coal and Rock Mass Fracturing Damage

煤岩与其他普通岩石的力学性能明显不同。为了描述煤岩体压裂岩体突变形成裂缝以及裂缝的扩展问题,基于突变理论定义了损伤变量,并建立了岩体突变过程的能量释放计算模型。基于能量守恒原理,建立了突变后微裂缝扩展的能量方程。通过对黑龙江省鸡西煤矿张晨矿区西三采区煤样在不同压裂阶段缝内流体净压力和微裂缝扩展规律的观察分析,得到由于岩体物性参数不同微裂缝开始破裂的时间也不同,为后续裂缝演化内在混沌特征的研究提供了依据。

Coal and rock mass has obvious difference with other ordinary rocks. In order to describe cracks formation of coal and rock mass fracturing and cracks evolution regulations,damage variable was been defined based on mutation theory,and calculation model of energy releasing during mutation process was been established. Energy equation of micro-crack evolution after mutation was also established based on energy conservation principle. By analysing the net pressure and micro-cracks evolution rules of coal samples at different fracturing period,which were taken from western No. 3 mining area,Zhangchen mining area of Jixi Coal Mine in Heilongjiang Province.Because of different physical parameters,the initial rupture time is different. The conclusion will give access for further study on inner chaos characteristics of cracks evolution.