工作面覆岩采动裂隙演化规律物理及数值模拟研究  

Study of the evolution of mining-induced fractures with longwall face proceeds-insight from physical and numerical modeling

作　　者：王婉洁[1] 高富强[2,3] WANG Wanjie;GAO Fuqiang(Publishing&Media Group,China Coal Research Institute,Beijing 100013 China;State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute),Beijing 100013,China;CCTEG Coal Mining Research Institute,Beijing 100013,China)

机构地区：[1]煤炭科学研究总院有限公司出版传媒集团,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室(煤炭科学研究总院),北京100013 [3]中煤科工开采研究院有限公司,北京100013

出　　处：《采矿与岩层控制工程学报》2023年第2期13-22,共10页Journal of Mining and Strata Control Engineering

基　　金：国家自然科学基金面上资助项目(52074154)。

摘　　要：了解工作面推进过程中采动裂隙的演化规律对于煤层气抽采及瓦斯控制至关重要。采用相似模拟和数值模拟的方法研究了工作面推进过程中采空区覆岩采动裂隙的演化规律,研究结果表明:采空区中部和采空区边界处靠近巷道的区域上覆岩层的采动裂隙存在截然不同的变化规律。采空区中部区域,上覆岩层的采动裂隙随着工作面的移进及越过呈现“迅速增加—逐步减低—稳定”的变化规律;采空区边界靠近巷道的区域,呈现“迅速增加—稳定”的变化规律。远离开切眼、靠近巷道的采空区上覆岩层采动裂隙发育最为充分;工作面走向平行于最大水平主应力时的各区域采动裂隙发育,显著高于工作面走向垂直于最大水平主应力时的;较硬直接顶对于提高采动裂隙渗透率有积极作用。Understanding the evolution of mining-induced fractures with longwall face proceeds is of great importance to coalbed methane drainage and gas control.In this study,physical modeling and numerical simulation methods are used to study the evolution of mining-induced fractures with longwall face proceeding under the condition of three-dimensional space and time.It is found that mining-induced fractures within a given domain of overlying strata above the near gob center changes in a distinct way in contrast to a domain close to the entries.The fracture volume of a given domain in the overlying strata above the gob center show a rapid increase-decreasing-steady change pattern as the longwall face approaches and passes by,comparing to a rapid increase-steady change pattern of a domain close to the entries.Mining-induced fractures are most fully developed in the overlying strata that are away from the cut face and near the entries.Under the condition of the maximum horizontal stress parallel to the direction of the longwall panel,the development of mining-induced fractures is significantly higher than that under the condition of the maximum horizontal stress vertical to the direction of the longwall panel.A stronger immediate roof has a positive effect on increasing the permeability of mining-induced fractures.

关 键 词：采动裂隙 瓦斯抽采 相似模拟 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]