摘要
针对淮北海孜矿新副井马头门处于岩层极为破碎、千米埋深、断面尺寸大等复杂条件,利用ABAQUS有限元数值软件进行了原支护设计方案情况下的马头门围岩稳定性分析,研究了马头门围岩位移场、应力场和塑性区的分布规律及支护结构的受力特征,据此对马头门的支护结构进行了设计优化。马头门初期支护采用锚、网、喷、索的支护形式;二次支护采用带反底拱的全断面钢纤维钢筋混凝土衬砌,增设底板注浆锚杆和底板锚索,并通过室内配合比试验确定了钢纤维混凝土的强度等级、钢纤维掺入率和最优配合比。现场监测结果表明,优化后的马头门支护结构安全储备较高且设计方案合理。
In response to such complex conditions as extremely broken rocks, one thousand meters depth, and large size section of new auxiliary shaft ingate in Haizi mine in Huaibei city, shaft ingate rock stability has been analyzed by ABAQUS finite element numerical software for original support design scheme, and distribution law of displacement field, stress field, plastic zone of ingate surrounding rock and mechanical characteristics of ingate supporting structure have been shown. The supporting structure design of ingate has been optimized according to numerical analysis result. Ingate primary supporting structure is composed of bolt, steel mesh, shotcrete and anchor. Ingate secondary support is composed of whole section steel fiber reinforced concrete lining with bottom arch, floor grouting bolt and floor anchor. Strength grade, steel fiber incorporation rate and the optimal mix of steel fiber reinforced concrete have been determined through laboratory tests. Field monitoring results show that ingate supporting structure has higher safety reserve and the design optimization is reasonable.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2015年第2期298-304,共7页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(50874002)
安徽省高等学校省级自然科学研究项目(KJ2010B318
KJ2012A094)
关键词
马头门
围岩稳定性
数值模拟
支护结构优化
ingate
rock stability
numerical simulation
supporting structure optimization
