厚顶煤软岩巷道破坏规律与支护技术  

Failure Law and Support Technology of Thick-top Coal Soft Rock Roadway

作　　者：李伟涛 LI Weitao(Mine Construction Branch Company,Xishan Coal Electricity Construction Engineering Group Co.,Ltd.,Taiyuan 030053,Shanxi,China)

机构地区：[1]西山煤电建筑工程集团有限公司矿建分公司,山西太原030053

出　　处：《能源与节能》2023年第8期145-147,共3页Energy and Energy Conservation

摘　　要：以马兰矿为工程背景,在煤厚多变和围岩“三软”条件下,对马兰矿厚顶煤软岩巷道矿压显现规律和软岩巷道锚固失效原因进行分析。现场调研发现,回采巷道顶底板变形明显,顶板锚固失效;在理论分析的基础上,认为围岩强度低和水对锚固剂、围岩的弱化作用是造成回采巷道锚杆(索)失效的主要原因;针对锚固失效问题,现场试验扩孔锚固效果,扩孔锚固后,锚固力整体提高25.0%~93.8%;在以上数据基础上,依据顶煤厚度的不同,提出差异性支护方案,以“端锚+注浆全长锚固”作为锚固增效技术手段,掘进期间巷道顶板下沉量相对较小。Taking Malan Mine as the engineering background,this paper analyzed the law of mine pressure behaviors and the causes of anchoring failure of soft rock roadways in the thick-top coal soft rock roadways of Malan Mine under the conditions of changeable coal thickness and three soft surrounding rocks.On-site investigation found that the deformation of the roof and floor of the mining roadway was obvious,and the anchoring of the roof failed;on the basis of theoretical analysis,it was believed that the low strength of the surrounding rock and the weakening effect of water on the anchoring agent and surrounding rock were the main reasons for the failure of the anchoring rods(cables)of the mining roadway;in view of the problem of anchoring failure,the effect of reaming anchoring was tested on the spot,after reaming and anchoring,the overall anchoring force increased by 25.0%-93.8%;on the basis of the above data,based on the different thickness of the top coal,different support schemes were proposed,with"end anchor+grouting full-length anchoring"as the anchoring efficiency enhancement technical means,the amount of sinking of the roof of the roadway during the excavation was relatively small.

关 键 词：软岩 矿压显现 回采巷道 锚固失效 锚固增效技术 

分 类 号：TD325[矿业工程—矿井建设] TD353