高应力软岩巷道围岩开槽卸压及参数优化

发布时间：2018-03-20 15:43

本文选题：高应力　切入点：卸压槽　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：基于高应力软岩巷道易破坏、难支护的特点,从粘弹性力学分析的基本假设入手,分析了高应力软岩巷道变形破坏特点并以分析了巷道顶底板以及两帮破坏的力学原因。通过比较高应力软岩巷道变形破坏的控制技术,引入卸压槽技术,从卸压槽开挖以后卸压区和巷道支承压力的变化分析出卸压槽的卸压机理,并在前人经验的基础上总结出卸压槽合理使用条件。利用FLAC3D数值模拟软件和相似模拟试验技术对卸压槽在不同埋深、位置、槽体深度和槽口宽度四个参数条件下的卸压效果进行模拟试验,并进行槽体的参数优化,得出如下结论:(1)卸压槽的卸压效果随着矿井埋深的增加而变的越来越好,说明卸压槽更适用于高埋深、高地应力的矿井。(2)卸压槽通过使巷道周边围岩应力重新分布,改变巷道周边围岩应力的集中程度以及转移应力集中峰值点来改变巷道周边围岩的强度条件,从而对巷道周边围岩进行弱化,最终达到保护巷道稳定的目的。(3)通过比较不同参数下卸压槽卸压效果得出卸压槽最佳优化参数:卸压槽的合理槽深应控制在0.5倍的巷道直径左右,而槽口高度应控制在0.15倍的直墙帮高度,卸压槽在直墙帮上的位置对于巷道变形破坏控制的影响不大,只对于顶板水平集中应力的峰值点有影响。
[Abstract]:Based on the characteristics of high stress soft rock roadway which is easy to destroy and difficult to support, this paper starts with the basic assumption of viscoelastic mechanics analysis. This paper analyzes the characteristics of deformation and failure of roadway with high stress and soft rock, and analyzes the mechanical reasons of roof and floor and two sides of roadway failure. By comparing the control technology of deformation and failure of roadway with high stress soft rock, the technology of pressure relief trough is introduced. The pressure relief mechanism of the pressure relief groove is analyzed from the variation of the pressure relief zone and the supporting pressure of the roadway after the excavation of the pressure relief groove. On the basis of the previous experience, the reasonable operating conditions of the pressure relief tank are summarized. Using the FLAC3D numerical simulation software and the similar simulation test technology, the pressure relief tank is buried in different depth and position. The pressure relief effect is simulated under four parameters of tank depth and slot width, and the optimization of tank parameters is carried out. It is concluded that the pressure relief effect of pressure relief groove becomes better and better with the increase of mine depth. It shows that the pressure relief groove is more suitable for the mine with high buried depth and high ground stress. Changing the concentration degree of surrounding rock stress and the peak point of transfer stress concentration to change the intensity condition of surrounding rock of roadway, thus weakening the surrounding rock around roadway. Finally, the purpose of protecting roadway stability is to reach the goal of protecting roadway stability. By comparing the pressure relief effect of the pressure relief groove with different parameters, the optimum parameters of the pressure relief groove are obtained: the reasonable depth of the pressure relief groove should be controlled at about 0.5 times the diameter of the roadway. The height of the slot should be controlled at 0.15 times of the height of the vertical wall, and the position of the pressure relief groove on the vertical wall has little effect on the control of roadway deformation and failure, but only on the peak point of the horizontal concentrated stress of the roof.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD322.5

【参考文献】