doi:10.16186/j.cnki.1673-9787.2020.1.1

Received:2019/04/10

Revised:2019/05/20

Published:2020/01/15

Study on the bolt-grounding support technology with wire-rope mesh offloor stress-relief slot for soft-rock roadway in deep shaft

LI Rubo1, ZHAI Yanwei2,  TU Xingzi1, ZHAI Xinxian3, HUANG Guangshuai3,  LIU Xiaoshuai3,  XIAO Tongqiang3

1. Pingdingshan Tian' an Coal Co. ，Ltd. ， Pingdingshan 467000 ，Henan ，China;2. State Key Laboratory of Hydraulics and Mountain River Engineering ，Sichuan University ，Chengdu 610065 ， Sichuan ， China;3. School of Energy Science and Engineering ，Henan Polytechnic University ， Jiaozuo 454000 ， Henan ，China

Abstract:Aiming at the engineering geological conditions and deformation characteristics of the surrounding rocks of soft-rock return-air rise roadway in deep shaft of No. 1 Mine of Pingdingshan Tian' an Coal Co. ，Ltd.， China， the change laws of stress field and plastic zone of the surrounding rocks of roadway （ TSRR ） before and after depressurization with floor stress-relief slot were studied with numerical calculation. Depressurization principle of floor stress-relief slot was analyzed and the bolt-grounding support technology with wire-rope mesh was put forward. The results showed that： （ 1 ） after the floor stress-relief slot was excavated， the high stress areas and the peak stress in the vertical and horizontal directions in the floor TSRR both were transferred to the floor deep surrounding rocks. The stress of surrounding rocks at the same floor depth of roadway after depressurization was less than that before depressurization. After depressurization， the plastic zones in the roof， floor and two sides of TSRR all increased， the effect of the floor stress-relief was obviously. （ 2 ） The broken zone and partial plastic zone of TSRR in deep shaft were the key points of roadway supporting. After the construction of floor stress-relief slot and bolt support with wire-rope mesh， the surrounding rocks grouting reinforcement fully were completed， the support-ring with bolt-grouting rock mass was formed in TSRR. Therefore， the strength and selfsupporting capacity of TSRR were improved. After the deformation of TSRR undergoes accelerated deformation stage， decelerated deformation stage， and stable deformation stage， TSRR had been in stable deformation state. Thus， the supporting tests of bolt-grounding support with wire-rope mesh and floor stress-relief slot had been successful in return-air rise roadway.

Key words:soft-rock roadway in deep shaft;floor stress-relief slot;ground stress field;bolt-grounding support;wire-rope mesh

深井软岩巷道底板卸压钢丝绳网锚注支护技术研究_李如波.pdf