采后覆岩裂隙岩体应力恢复的时空特征  

The space and time characteristics of the cover stress re-establishment of the fractured rock mass in the goaf after coal mining

作　　者：王文学[1,2] 王四巍[1] 刘海宁[1] 姜彤[1] 任淼[1] 

机构地区：[1]华北水利水电大学河南省岩土力学与结构工程重点实验室,河南郑州450045 [2]河南工程学院煤化工资源综合利用与污染治理河南省工程实验室,河南郑州451191

出　　处：《采矿与安全工程学报》2017年第1期127-133,共7页Journal of Mining & Safety Engineering

基　　金：河南省高等学校重点科研项目(16A410004);国家自然科学基金项目(41602298);煤化工资源综合利用与污染治理河南省工程实验室开放基金项目(502002-A04);华北水利水电大学高层次人才科研启动项目(40470)

摘　　要：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。For the space and time characteristics of the cover stress re-establishment of the fractured rock mass in the goal after coal mining, based on the analysis of the stress-strain characteristics of the caved rock mass in the goal, and combined with reducing law of the bulking factor of the remnant frac- tured rock mass as a logarithmic function with the level of the gob increasing, a model of the under- ground mining space evolution was established. The relationship between the ground subsidence and the cover stress re-establishment was built based on this model. The Knothe time function was applied for ground subsidence caused by underground coal mining to build the cover stress re-establishment time function. The relationships between the cover stress re-establishment, ground subsidence, and time were calculated based on practical mining cases. The results have shown that an exponential function can be used to describe these relationships, and the research results have significant guidance value for further research on space and time characteristics of the cover stress re-establishment in the goaf.

关 键 词：采空区 裂隙岩体 应力恢复 地面沉降 时空 

分 类 号：TD353[矿业工程—矿井建设]