矿业科学学报2024，Vol.9Issue(2)：258-269,12.DOI:10.19606/j.cnki.jmst.2024.02.012
胀锁型锚索双向加固窄煤柱试验研究与工程应用
Bidirectional reinforcement of narrow pillar with inflatable lock-type anchor experimental investigation and its application
摘要
Abstract
This study targets at asymmetric deformation of narrow coal pillar in gob-side entry driv-ing.We put forward the bidirectional reinforcement of narrow pillar with opposite-crossing anchor cable.Specifically,we designed two types of anchor cable structure:the byelongation type and the ex-pansion lock type,and carried out the pull-out test of opposite-crossing anchor cable,the test shows that both anchor cable structures could meet the tensile requirements.We conducted comparative analysis on the morphology of anchor cable failure,construction convenience and the economic aspect of material selection,where the expansion lock type crossed anchor was selected for narrow coal pillar bidirectional reinforcement.Furthermore,we investigated the bearing deformation patterns of coal pillars and the stress characteristics of anchor cables under different reinforcement methods through similar model tests and numerical simulation.Results show a 96.04%increase of peak load in the specimen reinforced by the double-row tight opposite-crossing anchor cable compared with that of the not reinforced specimen,and higher stability of the narrow pillar reinforced by the double-row tight opposite-crossing anchor cable as the rows of the anchor cable increases in number.The expansion lock anchor type crossed cable improved the energy storage and the critical failure point before the coal pillar was destroyed.Finally,the engineering test of expansive lock type crossed anchor cable to reinforcing narrow coal pillar was carried out in the transportation roadway of 123 lower 04 working face of Jining No.3 Coal Mine.The monitoring show that the anchoring force of the anchor cable exceeded 220kN,with 70&reduction of the coal pillar in the reinforcement area and good overall stability of the narrow coal pil-lar.It proves the feasibility of the bidirectional reinforcement technology of narrow pillar and provides new technical way for gob-side entry driving.关键词
沿空掘巷/双向加固/窄煤柱/胀锁型对穿锚索/拉拔试验/承压性能Key words
roadway excavation/bidirectional reinforcement/narrow coal pillar/expansive lock type crossed anchor cable/pull-out test/bearing capacity分类
矿业与冶金引用本文复制引用
王军,吕顺章,杨光,王波,谷长宛,王港..胀锁型锚索双向加固窄煤柱试验研究与工程应用[J].矿业科学学报,2024,9(2):258-269,12.基金项目
国家自然科学基金(52274121) （52274121）
山东省自然科学基金(ZR2022ME162) （ZR2022ME162）
河北省自然科学基金(E2022508023) （E2022508023）
