坚硬顶板高压磨料射流侧向切顶煤柱卸荷技术研究  

Research on unloading technology of coal pillar by high-pressure abrasive jet for lateral cutting hard roof

作　　者：季飞 JI Fei(State Key Laboratory of Coal Mine Disaster Prevention and Control,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]煤矿灾害防控全国重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《矿业安全与环保》2024年第1期120-126,共7页Mining Safety & Environmental Protection

基　　金：天地科技股份有限公司科技创新创业资金专项项目(2021-2-TD-ZD008);重庆英才计划“包干制”项目(cstc2022ycjh-bgzxm0220);重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0373)。

摘　　要：针对坚硬顶板下临空巷道存在的高应力、大变形、难支护等问题,分析了磨料射流能量分布情况,研究了磨料颗粒及高压水射流的冲击破岩作用。基于“砌体梁”原理,建立不同岩性条件下的岩层周期破断力学模型,研究了巷道侧向切顶条件下上覆岩层断裂情况,采用数值模拟分析切顶前后煤柱应力变化情况,提出了磨料射流侧向切顶煤柱卸荷技术。现场试验结果表明,采用磨料射流切顶后巷道高度变形量减小38.7%,宽度变形量减小45.8%,巷道变形得到有效控制。同时,切顶后每日最大总能量降低85.5%,平均每日总能量降低82.6%。验证了磨料射流侧向切顶对坚硬顶板的弱化效果,为坚硬顶板弱化治理提供了一种新的技术手段。Aiming to solve the problems of high stress concentration,large deformation,and difficulties to support in the gob-side roadway under a hard roof,the energy distribution of abrasive jet was analyzed.Impacts and rock breaking effects of abrasive particles and high-pressure water jet were investigated.Based on the principle of“masonry beam”,the periodic fracture mechanics model of rock strata under different lithological conditions was established.The fracture of the overlying rock layer under the condition of lateral cutting roof of the roadway was studied.The stress change of the coal pillar before and after the cutting roof was analyzed by numerical tools.Unloading technology of coal pillar of the abrasive jet lateral cutting roof was developed.The field test results show that the height deformation of the roadway is reduced by 38.7%and the width change is reduced by 45.8%.The roadway deformation is effectively controlled after the abrasive jet cutting roof treatment.At the same time,the maximum daily total energy is reduced by 85.5%and the average daily total energy is reduced by 82.6%after cutting roof.The weakening effect of abrasive jet lateral cutting roof on hard roof is certified.This study provides a new technical methodology for the weakening treatment of hard roof.

关 键 词：坚硬顶板 切顶 临空巷道 煤柱应力 磨料射流 高压水射流 

分 类 号：TD713[矿业工程—矿井通风与安全]