星村煤矿深部高应力软岩巷道二次支护技术研究

发布时间：2018-05-04 02:01

本文选题：高应力 + 软岩巷道　；参考：《山东科技大学》2017年硕士论文

【摘要】：随着开采深度的增加,深部高应力软岩巷道的支护问题已经成为制约煤炭开采的重大问题之一,探索深部高应力软岩巷道变形破坏特征及围岩控制机理对煤矿安全高效生产有着重要的意义。本文以星村煤矿为工程背景,针对星村煤矿生产时遇到的深部高应力巷道的支护问题开展研究,通过室内岩石力学实验测定了星村煤矿深部煤岩体的物理力学特性和主要的岩石力学参数,并对矿区进行了地应力测量,分析矿区地应力分布规律;研究了深部高应力软岩巷道围岩的力学属性,总结高应力软岩巷道围岩变形破坏的特点,在深部高应力软岩巷道支护原理的基础上,通过岩石力学理论,阐述了高应力软岩巷道的最佳支护时间的力学含义,确定了在深部高应力软岩巷道中采用让压支护及二次支护技术控制围岩变形的基本原则;运用FLAC3D模拟二次支护对深部高应力软岩巷道围岩的支护效果,通过数值计算模拟巷道围岩应力场、位移场及塑性区分布特征,对比分析了让压支护、大刚度支护及先一次让压后二次刚度支护对巷道围岩控制机理,并通过模拟一次让压支护后不同时机施加二次支护对围岩变形的控制效果,确定理论的最佳的二次支护时机。在星村煤矿-1196辅助进风大巷掘进迎头开挖巷道进行了一次让压支护和二次大刚度支护的工业性试验,并进行了现场监测,结果表明,一次支护采用锚网喷的让压支护方式,二次支护采用锚网索喷的大刚度支护方式能有效控制巷道围岩变形,保证围岩长期稳定,达到工程上容易、经济上合理的支护效果,对指导深部高应力软岩巷道支护工程具有一定的实践意义。
[Abstract]:With the increase of mining depth, the support problem of deep soft rock roadway with high stress has become one of the major problems restricting coal mining. It is of great significance to explore the deformation and failure characteristics of deep soft rock roadway under high stress and the control mechanism of surrounding rock for the safe and efficient production of coal mines. Taking Xingcun coal mine as the engineering background, this paper studies the support problem of deep high stress roadway in Xingcun coal mine. The physical and mechanical properties and main rock mechanics parameters of deep coal and rock mass in Xingcun Coal Mine are measured through laboratory rock mechanics experiments. The in-situ stress measurement is carried out and the distribution law of in-situ stress in the mining area is analyzed. In this paper, the mechanical properties of surrounding rock in deep soft rock roadway with high stress are studied, and the characteristics of deformation and failure of surrounding rock in soft rock roadway with high stress are summarized. On the basis of supporting principle of roadway with deep high stress and soft rock, rock mechanics theory is adopted. This paper expounds the mechanical meaning of the best supporting time of the soft rock roadway with high stress, and determines the basic principle of controlling the deformation of surrounding rock by means of the technology of compressing support and secondary support in the deep roadway of high stress soft rock. By using FLAC3D to simulate the supporting effect of surrounding rock of soft rock roadway with high stress, the stress field, displacement field and plastic zone distribution characteristics of surrounding rock of roadway are simulated numerically. The mechanism of controlling surrounding rock of roadway by large stiffness support and secondary stiffness support is obtained. By simulating the control effect of secondary support on the deformation of surrounding rock, the optimal time of secondary support is determined by simulating the control effect of secondary support on the deformation of surrounding rock by applying secondary support at different times. In Xingcun Coal Mine -1196 auxiliary wind entry roadway, the industrial test of pressure transfer support and secondary large stiffness support was carried out, and the results showed that the first support was supported by bolt-mesh shotcrete. The secondary support can effectively control the deformation of surrounding rock of roadway by bolting mesh and spraying with large stiffness, ensure the long-term stability of surrounding rock, and achieve easy and economical support effect in engineering. It has certain practical significance for guiding the support engineering of deep soft rock roadway with high stress.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353

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