连续开挖诱导断层活化顶板突水机制的模拟分析

发布时间：2018-02-23 12:47

本文关键词： 开挖断层活化突水数值模拟中关铁矿　出处：《东北大学学报(自然科学版)》2017年11期 　论文类型：期刊论文

【摘要】：以中关铁矿采动断层突水为例,对连续开挖过程断层活化顶板突水进行有限元模拟,从力学角度研究断层带应力和损伤区迁移过程,分析断层活化机制.研究表明:连续开挖是造成断层损伤区产生、累积扩展到贯通的主要诱因;随着开挖推进断层带内剪应力集中区域沿断层从上到下逐渐向顶板转移,断层损伤区状态由压剪变为拉剪,并不断扩展;损伤区在断层揭露时完全贯通,形成导水通道并诱发突水灾害.因此,对于工作面前方的非导水断层,采用水平超前钻孔未必能查明断层活化导水情况,为确保安全,需补充斜向上钻孔,探查更高位置断层的导水性.
[Abstract]:Taking the water inrush of the mining fault in Zhongguan Iron Mine as an example, the finite element simulation of water inrush from the active roof of the fault during continuous excavation is carried out, and the stress and the migration process of the damage zone in the fault zone are studied from the mechanical point of view. The mechanism of fault activation is analyzed. It is shown that continuous excavation is the main inducement of fault damage zone, and the shear stress concentration area in the fault zone moves gradually from top to bottom along the fault with excavation. The state of damage zone of fault is changed from compression shear to tension shear, and the damage area is expanded continuously. When the fault is exposed, the damage area is completely through, forming a water diversion passage and inducing water inrush disaster. Therefore, for the non-hydraulic fault in front of the face, The horizontal advance drilling may not be used to find out the fault active water conductivity. In order to ensure the safety, it is necessary to supplement the inclined upward drilling to explore the water conductivity of the fault in higher position.
【作者单位】：东北大学资源与土木工程学院;
【基金】：国家重点基础研究发展计划项目(2013CB227902) 国家自然科学基金资助项目(51574059,51404067)
【分类号】：TD745.2

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