软弱破碎围岩高强高预紧力支护技术与应用

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。

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

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.