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锚杆预紧力在巷道围岩中的力学效应 预览 被引量:30

The mechanics effect of bolt pretension in roadway surrounding rock
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摘要 针对巷道围岩稳定性控制中的整体锚固结构,分析了预应力锚杆的力学作用机理.预应力锚杆施加于围岩之上的预紧力所产生的横向挤压作用,是围岩形成整体锚固结构的必要条件.基于固体力学中的Boussinnesq研究了单根预应力锚杆作用下围岩中应力以及相应的横向挤压力的计算方法,建立了2根预应力锚杆共同作用下二者之间横向挤压力的理论计算公式.结果表明,2根锚杆之间的横向挤压力与锚杆预紧力成正比,与计算位置到锚杆安装位置的距离成反比;预紧力产生的横向挤压力在2根锚杆正中间位置最小;横向挤压力的大小除与围岩的泊松比有关外,还与锚杆安装密度、有效长度等有关.研究结果在塔山煤层巷道支护设计中得到应用. For the integral anchorage structure in stability controlling of roadway' s surrounding rock, the mechanism of action if pretensioned bolt was analyzed. The transverse conpressional effect caused by the pretensioning force which acted on surrounding rock and was loaded by pretensioned bolt was the necessary condition as integral anchorage taking shape in surrounding rock. By making use of the Boussinnesq solution in solid mechanics, the calculating methods of stress and transverse conpressional force caused by a single pretensioned bolt in surrounding rock were researched, and the theoretical calculating formulas of transverse conpressional force caused by two pretensioned bolts and acted on the rock between these two bolts was set up. The results show that transverse conpressional force between two bolts has relationship of direct proportion with pretensioning force of bolt, and have relationship of inverse change with the distance between calculating point and the installing place of bolts. The transverse conpressional force at the position of right in the middle of two bolts is the minimum. The value of transverse conpressional force not only related to Poisson' s ratio of surrounding rock, but also is concerned in the bolt installing density and bolt effective length. The result obtained is applied to support designing of roadway in coal seam in Tashan Coal Mine.
作者 翟英达 ZHAI Ying-da ( 1. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. Postdoctoral Research Station, Datong Coal Mine Group Company, Datong 037003, China)
出处 《煤炭学报》 EI CAS CSCD 北大核心 2008年第8期 856-859,共4页 Journal of China Coal Society
关键词 锚杆 预紧力 力学效应 应力 bolt pretensioning force mechanics effect stress
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