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彬长矿区厚硬岩层沉降能量释放与高势能涌水机理

Subsidence energy release and high potential energy water gushing mechanism of thick and hard rock strata in Binchang mining area

  • 摘要: 陕西彬长矿区煤层上方存在白垩系洛河组砂岩含水层,该岩层具有厚度大、富水性强、渗透系数大、水头压力大等特点,且上覆厚硬岩层破坏易导致高势能动力涌水发生。结合彬长矿区高家堡煤矿上覆岩层性质、导水裂隙带发育高度与工作面涌水量情况,对厚硬岩层破裂能量释放特征及工作面高势能涌水机理展开研究。结果表明:高势能涌水孕灾条件由“通道”“水源”与“力源”组成,其中“通道”的形成使“水源”发生运移,工作面出水由淋水转为涌水,“力源”的形成为“水源”运移提供了水压力,并增加了“通道”的数量与导通水量,使工作面由涌水转为高势能涌水;高势能涌水致灾过程中,覆岩破裂沉降和水体运移两个动态过程存在能量传递关系,经过对能量传递方程的推导,得出诱导高势能涌水主导条件为“力源”中的厚硬岩层破裂沉降;能量转化方程中,岩层能量吸收值与岩层能量吸收系数、破断层厚度与破断层倾向长度呈负相关,与破断层极限破断距呈正相关,且能量值呈指数级增长;结合覆岩能量变化趋势与工作面涌水量变化情况,得到涌水量升高区间,覆岩应力与能量值波动较大,且在厚硬岩层发生破断时,工作面涌水量达到峰值,工作面形成高势能涌水。研究揭示了高势能涌水孕灾机制,并建立了高势能涌水物理模型,明确了各影响因素间的关系,推导了厚硬岩层破裂沉降能量转化方程,阐释了不同影响因素与岩层吸收储存能量值间影响规律,揭示了厚硬岩层破裂沉降能量释放特征与工作面高势能涌水间联动关系。

     

    Abstract: There is a Cretaceous Luohe Formation sandy conglomerate aquifer above the coal seam in the Binchang mining area, Shaanxi. This rock layer has the characteristics of large thickness, strong water - richness, large permeability coefficient, and large water head pressure. Moreover, the damage of the overlying thick and hard rock layer is likely to lead to the occurrence of high - potential dynamic water inrush. Combining the properties of the overlying rock layer of the Gaojiapu coal mine in the Binchang mining area, the development height of the water-conducting fracture zone, and the water inrush volume of the working face, the research on the energy release characteristics of the thick and hard rock layer fracture and the mechanism of high potential energy water gushing in the working face was carried out. The results show that the disaster-causing conditions of high potential energy water gushing are composed of “channel”, “water source”, and “force source”. Among them, the formation of the “channel” makes the “water source” migrate, and the water outflow from the working face changes from dripping to inrush. The formation of the “force source” provides water pressure for the migration of the “water source”, and increases the number of “channels” and the water conduction volume, making the working face change from water inrush to high - potential water inrush. During the disaster-causing process of high potential energy water gushing, there is an energy transfer relationship between the two dynamic processes of overlying rock fracture settlement and water migration. Through the derivation of the energy transfer equation, it is concluded that the dominant condition for inducing high potential energy water gushing is the fracture settlement of the thick and hard rock layer in the “force source”. In the energy conversion equation, the energy absorption value of the rock layer is negatively correlated with the energy absorption coefficient of the rock layer, the thickness of the broken layer, and the length of the broken layer’s dip direction, and positively correlated with the ultimate broken distance of the broken layer, and the energy value shows an exponential growth. Combining the change trend of the overlying rock energy and the change of the water inrush volume of the working face, it is found that in the interval where the water inrush volume increases, the stress and energy value of the overlying rock fluctuate greatly, and when the thick and hard rock layer breaks, the water inrush volume of the working face reaches the peak value, and the working face forms high potential energy water gushing. The research reveals the disaster-inducing mechanism of high potential energy water gushing, establishes the physical model of high potential energy water gushing, clarifies the relationship between various influencing factors, deduces the energy conversion equation of the fracture settlement of the thick and hard rock layer, explains the influence laws between different influencing factors and the energy absorption and storage value of the rock layer, and reveals the linkage relationship between the energy release characteristics of the fracture settlement of the thick and hard rock layer and the high - potential water inrush of the working face.

     

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