【摘要】 为了研究背景应力场、微震活动规律和突水危险性之间的关系,结合张马屯铁矿注浆帷幕共同体堵水工程,运用已经建立并运行的ESG微震监测系统,圈定微破裂形成并积聚的三维空间,划分注浆帷幕共同体的突水危险区域。通过三维有限元程序MSC.PATRAN建立矿帷幕共同体的三维力学模型,模拟高水压下的背景应力场分布,得到矿帷幕共同体的应力场集中区域。二者对比结果表明:帷幕西南区域和矿体采空区两侧积聚了大量的微震定位事件,微震活动性信息较为明显;而在上述2个区域,高水压力和开采扰动使原应力场发生极大改变,出现了明显的地应力集中现象,说明应力场的扰动会诱发微破裂的萌生、发展和贯通。微震活动规律与背景应力场表现出了很好的一致性,采用不同的科研手段分析和预测注浆帷幕共同体背景应力场和微震活动规律的前兆性信息特征,并且初步评价其突水危险性。研究成果可以指导工程技术人员采取相应的开采方式和防治措施,为井下开采活动的正常运行提供安全保障。更多还原

【Abstract】 In order to understand the relation between background stress field of three-dimensional numerical simulation with microseismicity and water inrush probability,combining with an engineering case of grout curtain community for Zhangmatun iron mine,an operation microseismic monitoring system of ESG is used.Then,the accumulated three-dimensional geometry spaces of micro-rupture is delineated;and the possible dangerous water inrush regions of grout curtain community are divided.A three-dimensional mechanical model of curtain community is established by three-dimensional FEM,MSC.PATRAN,to simulate the background stress field distribution under high water pressure to obtain the stress field concentration region of curtain community.The comparative research results show that a large number of microseismic location events are accumulated at curtain southwest region and orebody bilateral mined-out area;the microseismicity information is very clear;original stress field greatly changes under high water pressure and mining disturbance in the above two region.There are the apparent stress concentrations here,which implies that micro-rupture will occur,develop and link under high stress.So microseismicity and background stress fields are almost consistent;and different scientific research methods illustrate the precursory characteristics of background stress field and microseismicity of grout curtain community.Then,the probability of water inrush is evaluated preliminarily.As a result,some reasonable exploitation methods and prevention measures can be adopted to provide safe measures for underground mining activities.更多还原