软弱破碎围岩高强高预紧力支护技术与应用  

Application of Support Technology with High Strength and High Pretension Stress for Weak-Broken Rocks

作　　者：王宏伟[1] 姜耀东[1] 赵毅鑫[1] 祝捷[1] 单如月[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《采矿与安全工程学报》2012年第4期474-480,共7页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010CB226801);国家自然科学基金项目(51174213);煤炭资源与安全开采国家重点实验室开放基金项目(SKLCRSM10KFB09);中央高校基本科研业务费专项资金项目(2010YL10,2010QL02);北京市支持中央在京高校共建项目

摘　　要：为了达到对软弱破碎围岩巷道的一次支护到位,从加固破碎岩体、提高支护阻力和降低围岩采动应力3方面综合研究入手,提出了以高强高预紧力锚网喷主动支护为基础,配合U型钢可缩支架的支护方式,旨在使各支护方式在承载力上优势互补,并且充分调动围岩的承载能力,使支护体系与围岩形成承载整体。基于小康矿和木城涧矿等不同地质条件下的软弱破碎围岩巷道变形破坏原因,分析了软弱破碎围岩巷道破坏特征和高强高预紧力支护技术特点。现场试验结果表明,针对不同地质条件,高强高预紧力支护技术能够通过调动深部稳定岩层的承载能力和提供较大支护阻力等手段有效控制巷道围岩的剧烈收缩,并且一定程度上降低了工作面采动应力的影响,取得了良好的支护效果和经济效益。Due to high stress and low rock strength environment, the support of weak-broken rocks under the condition of deep mining should be solved through strengthening broken rock, reinforcing support resistance and decreasing the mine-induced stress. For the purpose of permanent support for the weak-broken rocks, this study has pointed out the support technology with high strength and high pre- tension stress which is based on the bolt-wire-shotcrete system combined with steel arched yielding support. This kind of support technology have combined the each support element and adequately taken advantage of load-caring capacity of surrounding rocks. Based on the monitoring data of Xiaokang coal mine and Muchengjian coal mine, the characters of weak-broken rocks and the features of the support technology with high strength and high pretension stress were analyzed. The results of field tests indi- cate that the support technology with high strength and high pretension stress has provided powerful support force to resist large deformation of weak-broken surrounding rocks for the various geological conditions. It is proved that the mine-induced stress can also be released by the support technology and the support technology with high strength and high pretension stress has economical significance.

关 键 词：软弱破碎围岩 高强高预紧力 支护阻力 采动应力 U型钢可缩支架 

分 类 号：TD353[矿业工程—矿井建设]