论文部分内容阅读
在建立断层面受力模型的基础上,通过断层面正应力和孔隙压力关系分析影响断面附近煤与瓦斯突出的关键参数,重新定义封闭系数并引入剪切指数概念,以此判断断层的封闭性及结构稳定性。研究发现,正应力大小与断层走向锐夹角正相关,而切应力与走向锐夹角关系取决于最大、最小水平应力和与正应力比值;在断层附近发生煤与瓦斯突出,依据断层结构参数和应力场差异,瓦斯压力存在极值条件,结合构造煤分布及瓦斯压力与正应力关系将其分为两大模式:流压控制型(FPC)和流–固耦合型(FSC),并通过一个具体案例证实断层应力状态对煤与瓦斯突出的控制。
Based on the establishment of the fault plane stress model, the critical parameters that affect the coal and gas outburst near the cross section are analyzed based on the relationship between the normal stress of the fault plane and the pore pressure. The closed coefficient is redefined and the concept of shear index is introduced to determine the fault seal And structural stability. It is found that the magnitude of normal stress is positively correlated with the sharp angle of fault, and the relationship between shear stress and sharp strike angle depends on the ratio of maximum and minimum horizontal stress and normal stress. Coal and gas outburst occurs near the fault. According to the fault structure parameters And stress field, there exists an extreme condition of gas pressure. According to the distribution of tectonic coal and the relationship between gas pressure and normal stress, it is divided into two modes: flow pressure control (FPC) and fluid-solid coupling (FSC) A specific case confirms the control of coal and gas outburst due to the stress state of faults.