深部开采底板裂隙扩展演化规律试验研究

发布时间：2018-04-26 01:32

本文选题：采矿工程 + 深部开采　；参考：《岩石力学与工程学报》2016年11期

【摘要】：为进一步研究深部底板岩体的破裂失稳机制,基于自主研制的高水压底板突水相似模拟试验系统,建立深部承压水上含小断层底板采动裂隙演化及导水通道形成的模型,通过在底板不同深度布设应力传感器和位移监测点,研究底板和断层附近岩体随工作面开采的应力及位移变化规律,反演得到底板及断层采动裂隙的发育及扩展演化规律,为深部开采工作面突水机制的研究提供了一种新的思路。结果表明:工作面开采过程中,底板岩体的受力变化规律主要有2种:(1)开切眼左侧煤柱底板岩体的应力增量出现先增大后减小的变化趋势;(2)采场底板岩体的应力增量出现先增大后减小至零再反向增大的变化趋势。深部底板岩体的采动裂隙主要在开切眼、采空区中部和回采工作面3个部位产生,裂隙类型以竖向张裂隙、剪切裂隙和层向裂隙为主,且在主要裂隙附近衍生出一些细微的小裂隙。距煤层较近的断层上、下盘岩体受到的应力差较大,断层上盘在强剪应力差的作用下形成了一条与断层走向平行的剪切裂隙,加快了断裂面破碎岩体的相对滑动程度,促进了断层的活化。
[Abstract]:In order to further study the fracture and instability mechanism of deep floor rock mass, based on the self-developed water inrush simulation test system of high hydraulic pressure floor slab, a model of mining fissure evolution and channel formation of bottom slab with small fault in deep confined water is established. By placing stress sensors and displacement monitoring points at different depths of the floor, the variation of stress and displacement of the rock mass near the floor and the fault with the mining face is studied, and the law of the development and expansion and evolution of the floor and fault mining fissures is obtained by inversion. It provides a new way to study the mechanism of water inrush in deep mining face. The results show that: in the process of mining, The stress increment of the floor rock mass on the left side of the cut hole increases first and then decreases. The stress increment of the floor rock mass increases first and then decreases to zero. An increasing trend of change. The mining fissures of deep floor rock are mainly produced in the open and cut holes, in the middle of goaf and in the mining face. The types of fractures are vertical fracture, shear fissure and stratum fracture. And there are some small cracks in the vicinity of the main fissure. On the fault near the coal seam, the stress difference of the rock mass in the lower face is great. Under the action of the strong shear stress difference, a shear crack parallel to the strike of the fault is formed in the upper face of the fault, which speeds up the relative sliding degree of the fractured rock mass on the fault plane. It promotes the activation of faults.
【作者单位】：山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地;河南理工大学河南省矿产资源绿色高效开采与综合利用重点实验室;中国矿业大学(北京)地球科学与测绘工程学院;山东能源集团淄博矿业集团有限责任公司;
【基金】：国家自然科学基金资助项目(51604167) 河南理工大学河南省矿产资源绿色高效开采与综合利用重点实验室开放基金资助项目(S201610) 中国博士后科学基金资助项目(2015T80731)~~
【分类号】：TD745

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