CAJ | 학술논문

针对沿空留巷隔离墙早期无强度的缺陷,预先在隔离墙内侧与外侧布置单体柱和惠天锚柱来形成隔离墙预支撑轮廓,根据岩层控制的关键层理论,建立了不同支撑作用沿空留巷围岩结构力学模型. 分析了预支撑、隔离墙、围岩相互作用机制,提出了锚柱网预支撑袋铸混凝土沿空留巷技术,并在理论研究的基础上进行了工业性试验,结果表明:预支撑可以改变围岩的断裂位置,降低隔离墙的支护阻力;巷帮的支护阻力越大,围岩沿巷道外侧断裂所需的预支撑支护阻力越小;预支撑的初撑力越大,工作面回采后帮锚杆的荷载衰减越快且巷帮的变形量就越小.
침대연공류항격리장조기무강도적결함,예선재격리장내측여외측포치단체주화혜천묘주래형성격리장예지탱륜곽,근거암층공제적관건층이론,건립료불동지탱작용연공류항위암결구역학모형. 분석료예지탱、격리장、위암상호작용궤제,제출료묘주망예지탱대주혼응토연공류항기술,병재이론연구적기출상진행료공업성시험,결과표명:예지탱가이개변위암적단렬위치,강저격리장적지호조력;항방적지호조력월대,위암연항도외측단렬소수적예지탱지호조력월소;예지탱적초탱력월대,공작면회채후방묘간적하재쇠감월쾌차항방적변형량취월소.
To aim at the defect that the separating wall has no strength in the early time of gob-side entry retaining, individual props and H-T anchor columns were arranged along both the inside and outside of the separating wall to form a pre-support contour, and based on the key strata theory of rock control, mechanical models of the surrounding rock structure having different support effect in gob-side entry retaining were established. Analysis was made on the interacting mechanism of the pre-support, the separating wall and the surrounding rock, the gob-side entry retaining technology with the bag-casting concrete and H-T anchor column as pre-support was put forward, and based on the theoretical study, industrial test was carried out on this technology. The results showed that the pre-support can change the fracture location of surrounding rock, reduce the support resistance of the separating wall; the greater the support resistance of the roadway side, the smaller the pre-support resistance required for ensuring the surrounding rock fracturing along the outside of the roadway;the larger the setting load of the pre-support, the faster the load of the side anchors decayed after the winning of the coal face and the smaller the deformation of the roadway side.