预应力损失对高预应力全锚索支护技术的影响  

Influence of Pre-stress Lose on Anchored Cable Supporting with High Pre-stress

作　　者：马长乐 吴拥政[2] 何杰[2] 

机构地区：[1]潞安矿业(集团)有限责任公司余吾煤业,山西长治046032 [2]天地科技股份有限公司开采设计事业部,北京100013

出　　处：《煤矿开采》2012年第2期61-63,72,共4页Coal Mining Technology

基　　金：国家科技支撑计划资助项目(2008BAB36B07)

摘　　要：针对余吾煤业全断面强力锚索支护技术应用中预应力损失问题,借助有限差分数值计算程序FLAC,模拟研究了不同锚索预应力下围岩应力分布特征和支护效果,探讨了影响预应力损失因素。依据井下具体工程环境,统计分析了预应力损失范围一般为20%～25%,提出采用超张拉25%弥补预应力损失,并在井下全断面强力锚索支护中应用试验。实践结果表明:预应力的损失严重减弱了全断面强力锚索支护效果,采用超张拉技术后,设计的支护方案能有效地控制围岩变形。For the problem of pre-stress lose of whole-section consolidated anchored cable supporting in Yuwu Coal,applying FLAC to simulating stress distribution characteristic and supporting effect under different pre-stresses of anchored cable.Pre-stress lose was usually 20%-25%.It was put forward that pre-stress was compensated by super tension 25%.Underground practice showed that pre-stress lose seriously weakened whole-section consolidated anchored cable supporting effect and super tension technology could effectively control deformation of surrounding rock.

关 键 词：预应力损失 高预应力 全断面 强力锚索支护 超张拉 

分 类 号：TD353[矿业工程—矿井建设]