Retreat longwall mining with a double-use entry system has many advantages over other multiple-entry systems including high coal recovery, extra entry excavation, and low risk of coal bursts. The essential of the double-use entry system is to construct a competent solid sidewall to ensure the stability, shape, and profile of the entry during retreating the first longwall face. In this study, a new comprehensive ground control measure is proposed for the construction of the sidewall and ground control of double-use entries. The system consists of strong support components to support the entry roof, in conjunction with destressing measures to diminish the influence of excessive mining-induced pressures. Laboratory tests and numerical modeling are performed to evaluate the effect of the competent support element and destressing measures, to optimize the proposed ground control system. Field-monitored data and on-site examinations showed that the proposed system successfully controlled the deformation of the double-use entry and maintained its profile during the coal mining of the first and second longwalls. The proposed system provides a new alternative for underground coal mines with restricted requirements of high coal recovery and coal burst prevention through optimizing longwall entry system.

与其他多次进入系统相比，采用双用进入系统的后退式长壁开采具有许多优势，包括煤炭回收率高、额外的进入开挖和煤爆风险低。两用入口系统的本质是建造一个称职的坚固侧壁，以确保在后退第一个长壁工作面期间入口的稳定性、形状和轮廓。在本研究中，针对两用入口的边墙和地面控制施工提出了一种新的综合地面控制措施。该系统由支撑入口顶板的坚固支撑部件组成，并结合减压措施以减少过度采矿引起的压力的影响。进行实验室测试和数值建模以评估有效支撑元件和减压措施的效果，优化拟议的地面控制系统。现场监测数据和现场检查表明，所提出的系统成功地控制了双重用途入口的变形，并在第一和第二长壁采煤期间保持了其轮廓。所提出的系统通过优化长壁进入系统，为具有高采煤率和防爆煤要求的地下煤矿提供了一种新的替代方案。