矸石充填工作面沿空留巷围岩结构演化机理  

Structural evolution mechanism of surrounding rock of gob side entry retaining in backfilling mining face

作　　者：龚鹏[1,2] 马占国 和泽欣[2] 徐敏 陈韬 GONG Peng;MA Zhanguo;HE Zexin;XU Min;CHEN Tao(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221l16,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou,Jiangsu1221116,China)

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与土木工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2023年第4期764-773,785,共11页Journal of Mining & Safety Engineering

基　　金：国家重点研发计划项目(2019YFC1904304);国家自然科学基金项目(52104107,U22A20598);江苏省青年基金项目(BK20200634)。

摘　　要：针对综采矸石充填工作面沿空留巷围岩控制难题,采用数值模拟、理论分析、现场实测等手段,研究矸石充填沿空留巷岩层结构演化特征和载荷传递机制。分析巷旁支护体宽度、柔性层厚度等关键结构参数对巷旁支护水平变形、工作阻力和能量演化的影响规律。结果表明:顶板“大结构”的回转变形特征主要由充填区压实力学特性决定。基本顶结构性回转造成的岩层下沉以“给定变形”的方式施加于留巷“小结构”。巷旁支护体上部设置柔性层可达到适应基本顶“给定变形”的目的;合理的巷旁工作阻力能够限制直接顶离层、剪胀等附加变形,同时避免充填区破碎矸石在顶板高应力作用下的侧向流动。巷旁支护体弹性应变能密度与柔性层厚度呈负相关关系,弹性应变能在充填区侧的积聚反映了该区域的主要承载作用,弹性应变能的积聚程度为巷旁支护状态评价和参数优化提供必要依据。Aiming at solving the problem of surrounding rock control along gob-side entry retaining(GER)in fully mechanized gangue backfilling face,the structural evolution characteristics and load transfer mechanism of the rock layer along the GER in gangue backfilling face are studied with numerical simulation,theoretical analysis and field measurement.And the influence of the key structural parameters such as the width of the roadside support(RSS)and the thickness of the flexible layer on the horizontal deformation,working resistance and energy evolution of the RSS is analyzed.The results show that the rotational deformation characteristics of the"large structure"of the roof are mainly determined by the compaction mechanical characteristics of the filling area.The subsidence of the rock layer caused by the rotation of the basic roof structure is applied to the"small structure"of the retained roadway in the form of"given defor-mation".The flexible layer on the upper part of the RSS can adapt to the"given deformation"of the basic roof.Reasonable working resistance of the RSS can limit the additional deformation of the direct roof caused by delamination and shear expansion,and avoiding the lateral flow of crushed gangue under high roof stress in the filling area at the same time.The density of elastic strain energy of roadside support is negatively correlated with the thickness of flexible layer.The accumulation of elastic strain energy on the side of filling area reflects the main bearing function of this area.And the accumulation degree of elastic strain energy provides a necessary basis for the status evaluation and parameter optimization of the RSS.

关 键 词：沿空留巷 结构演化 巷旁支护 能量 

分 类 号：TD353[矿业工程—矿井建设]