摘要
分析了目前煤矿锚索支护存在的问题,在高预应力强力支护理论的基础上,提出高预应力、长度较短的强力锚索,并全断面垂直岩面布置,是高地压、大变形巷道的有效支护方式.介绍了强力锚索及配套护表构件的力学性能,将强力锚索、拱形大托板及钢筋网组成全断面强力锚索支护系统,在锚索施加预应力的同时,给钢筋网也施加了较高的预应力,使钢筋网成为预应力支护系统的重要组成部分.在潞安矿业集团有限责任公司漳村煤矿一条与回采工作面对掘的、受2次强烈动压影响的巷道中,进行了全断面高预应力强力锚索支护技术试验,巷道支护状况发生本质变化.巷道两帮移近量比原支护方式降低90%,顶板离层几乎为0,围岩变形得到有效的控制.不仅解决了巷道支护难题,而且验证了支护理论的正确性.
The present problems of cable bolting in coal mines were analyzed. Based on high pretensioned stress and intensive bolting theory, it was put forward that the high pretensioned stress and intensive cable bolting with shorter length, set in full section and vertical to surface of roadways is an effective supporting type to the roadways with high stress or large deformation. The mechanical properties of intensive cable bolts, plate and steel mesh were introduced. The full section intensive cable bolting system was formed by intensive cable bolts combined with large domed plates and reinforced steel mesh. The reinforced steel mesh was put higher pretensioned stress when the cable bolts were pretensioned, which became an important part for pretensioned supporting system. The underground experiment of the full section high pretensioned stress and intensive cable bolting was carried out in an entry driven close to a facing working face, which was affected by twice violent dynamic pressure, and essential changes were taken place in entry supporting state. The side-to-side convergence of the entry is reduced about 90% compared with the former supporting type, the roof delamination is reduced to almost zero, and the deformation of the surrounding rock is effectively controlled. The difficult problems of roadway supporting were solved, meanwhile, the validity of the bolting theory was verified.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2009年第9期1153-1159,共7页
Journal of China Coal Society
基金
国家科技支撑计划项目(2008BAB36B07
2006BAB16B02)
关键词
全断面锚索支护
高预应力
强力锚索
动压巷道
cable bolting in full section
high pretensioned stress
intensive cable bolt
entry affected by dynamicpressure
