大采高工作面切顶留巷支护参数优化研究

发布时间：2018-09-18 18:07

【摘要】：针对大采高开采条件下煤层较厚,在切顶留巷技术现场实施过程中,常遭受矿压显现剧烈、巷道变形严重,给留设巷道的顶板支护带来难题,以柠条塔煤矿大采高S1201工作面为工程背景,采用恒阻大变形锚索作为巷道顶板的关键支护设备,在现场进行了5种不同支护方案的对比试验,通过对比不同支护方案下的顶板下沉规律,得到了有效的切顶留巷顶板支护参数。结果表明:S1201区段运输平巷有效且经济的架后补强支护方式是在原支护的基础上,于切缝侧补强1排恒阻锚索,锚索长度增加至9 000 mm,排距2 000 mm,除此之外补打3列普通锚索,普通锚索间距1 500 mm,普通锚索间去掉W钢带。该工程的成功应用为国内厚煤层切顶留巷技术提供了借鉴。
[Abstract]:In view of the thick coal seam under the condition of large mining height, during the field implementation of cutting roof and retaining roadway technology, it is often subjected to severe mine pressure and serious deformation of roadway, which brings difficulties to roof support of retaining roadway. Taking the large mining height S1201 face of Caragana Tower Coal Mine as the engineering background and using the constant resistance and large deformation anchor cable as the key supporting equipment of the roadway roof, the comparative tests of five different supporting schemes are carried out in the field. By comparing the law of roof subsidence under different supporting schemes, the effective roof support parameters of cutting roof and retaining roadway are obtained. The results show that the effective and economical way of supporting the carriage roadway of section S1201 is to reinforce 1 row of constant resistance anchor cable on the side of the cut joint on the basis of the original support, and the length of the anchor cable is increased to 9 000 mm, row distance of 2 000 mm, in addition to which 3 rows of ordinary anchor cables are added. W strip is removed between normal anchor cables and 1 500 mm, normal anchor cables. The successful application of this project provides a reference for cutting and retaining roadway technology of thick coal seam in China.
【作者单位】：陕西煤业股份有限公司神南矿业公司;中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;山东大学岩土与结构工程研究中心;
【基金】：国家自然科学基金资助项目(51674265)
【分类号】：TD353

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