摘要
针对强烈动压造成巷道大变形、强破坏的技术难题,以贵州湾田煤矿1433车场为工程实例,从工程布局上分析巷道矿压显现特征,得出强烈采动影响和支护设计不合理是造成巷道围岩强破坏的主要原因。针对原支护中存在的技术缺陷,提出再造承载拱的巷道支护理念,并以普氏理论为基础对再造承载拱的厚度进行理论计算,得出巷道有效注浆范围为7.91m,注浆加固后实施高强锚索支护,能在巷道围岩浅部形成一个稳定的承载结构,锚注加固区域之外的破碎区吸收巷道上部工作面采动应力,极大地降低对再造承载拱的破坏,有效保证巷道围岩稳定。工程实践表明:注浆后强烈动压造成的破碎围岩得到有效固结,有利于锚索预应力的扩散,高强预应力锚索支护后围岩的整体承载能力得到极大增强,巷道围岩变形量明显减小,表明再造承载拱加高预应力锚索支护方案对动压影响下巷道围岩控制有较好的效果。
In order to overcome the support difficulty of roadway severe deformation and severe destruction in soft and mudding roadway, taking 1433 yard cross-cut in Wantian coal mine in Guizhou province as a project example, the strata pressure behaviors characteristics of roadway were analyzed by means of theoretical analysis. It was concluded that the strong dynamical pressure impact and the unreasonable support design were the main reasons for the large deformation and strong destruction in surrounding rock. Combined with the technical defects existing in the original scheme of support design, the concept of roadway supported with renewable bearing arch was put forward, a stable renewable bearing arch was formed in the surrounding rock of roadway through bolt-grouting reinforcement, and the mining stress and displacement released from the deep surrounding rock was absorbed by the fracture zone outside the reinforcement of bolt grouting, which greatly reduces the damage to the renewable bearing arch and effectively ensures the stability of roadway surrounding rock. Through the field experiment and observation, the effect of borehole after grouting reinforcement is better through observation by peeping, and the anchorage zone of broken rock was effectively consolidated. The deformation of surrounding rock was obviously decreased under the dynamical pressure impact, and the bearing capacity of anchor bolt was greatly enhanced. The results show that: the scheme of renewable bearing arch has a good supporting effect on soft and mudding roadway under the dynamical pressure impact.
作者
徐佑林
许猛堂
程利兴
XU Youlin;XU Mengtang;CHENG Lixing(Institute of Mining Engineering,Guizhou Institute of Technology,Guiyang,Guizhou 550003,China;Key Laboratory of Deep Coal Mine Excavation Response &Disaster Prevention and Control,Anhui Province (Anhui University of Science and Technology),Huainan,Anhui 232001,China;Coal Mining and Designing Department,Tiandi Science and Technology Co Ltd,Beijing 100013,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2018年第6期1135-1141,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金青年科学基金项目(51764010)
贵州省自然科学基金项目(黔科合基础[2016]1068)
贵州省教育厅青年科技人才成长项目(黔教合KY字[2016]230)
深部煤矿采动响应与灾害防控安徽省重点实验室开放基金项目(KLDCMERDPC16105)
关键词
动压影响
锚注加固
再造承载拱
破碎区
dynamical pressure impact
bolt-grouting reinforcement
renewable bearing arch
fracture zone
作者简介
徐佑林(1982-),男,贵州省贵阳市人,博士,副教授,从事煤矿巷道支护技术方面的研究。E-mail:xuyoulin2006@163.com, Tel:0851-88211029
