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为了研究分析采空区裂隙岩体应力恢复的时空特征,本文在分析采空区垮落破碎岩体的应力应变特征的基础上,根据采动裂隙岩体平均体积碎胀系数随高度变化满足对数函数的衰减规律,建立了地下煤层开采采空空间演化模型。基于该模型推导建立了采空区垮落破碎岩体应力恢复与地面沉降之间的函数关系,引入地下煤层开采引起地表移动过程的Knothe时间函数,给出了采空区破碎岩体应力恢复随时间变化的函数关系。结合开采实例对各函数关系应用拟合分析,结果表明采空区垮落破碎岩体应力恢复与地面沉降及时间关系均满足指数函数关系,研究结果对采空区应力恢复的空间、时间问题的研究有着重要指导意义。
In order to study the spatio-temporal characteristics of stress recovery in mined-out fractured rock mass, based on the analysis of the stress and strain characteristics of the collapsed rock mass in goaf, according to the variation of the average volumetric expansion coefficient along with the height of the mining fractured rock mass, The decay rule of the number function, and established the evolvement model of the mined-out space of underground coal seam mining. Based on the model, the function relationship between stress recovery and ground subsidence of the broken broken rock mass in goaf is deduced. The Knoe time function of surface movement induced by underground coal seam mining is introduced. The stress recovery of the broken rock mass in goaf The function of time changes. According to the mining example, the fitting analysis of each function relationship is applied. The results show that the stress recovery and ground subsidence of the collapsible rock mass in goaf meet the exponential function, Research has important guiding significance.