摘要
以济宁三号煤矿63下04(南)-2运矸巷沿空留巷为工程背景,提出固体充填采煤沿空留巷上覆岩层协同控制系统的概念,分析了上覆岩层协同控制系统各要素的支护特性;以顶板允许下沉量及采煤成本等指标为依据,采用FLAC3D确定了影响巷道围岩稳定性的3个因素的参数值,也即在充填工作面充实率需达到80%,矸石带强度需达到4 MPa,矸石带宽高比需达到1∶1的条件下,可保障巷道的稳定控制;同时结合济宁三号矿具体地质条件,给出了沿空巷道加固支护方案。现场工业性试验表明:该技术的实施下沿空巷道顶底板移近量最大300 mm,两帮移近量最大240 mm,沿空巷道维护效果良好。
In this paper,the gangue lane of 04（south）-2 workface with gob-side entry retaining in 63 rd mining district,Jining No.3 coal mine,has been set as the engineering background. The concept of cooperative control system including overburden layers and gob-side entry retaining with solid backfilling has been put forward. Also the support characteristic of key components in such cooperative control system have been analyzed. Based on such indexes as the roof-allowing subsidence and mining cost,three parameters of affecting surrounding rock stability in roadway are obtained by using FLAC3 D. In other words,the entry can be controlled stably under three conditions： 1） filling ratio of working face achieves up to 80%,2） strength of Gangue belt reaches 4 MPa,and 3） width/height ratio is 1∶1. Combined with the specific geological conditions of Jining No.3 coal mine,enhanced support plan for gob side entry has been proposed. The results from field test show that the roadway will be well maintained when the maximum convergence between roof and floor is approximately 300 mm and the side to side convergence amount is 240 mm.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2015年第6期936-942,共7页
Journal of Mining & Safety Engineering
基金
江苏省“青蓝工程”项目
中国矿业大学重大项目培育工程专项项目(2014ZDPY02)
国家自然科学基金创新研究群体项目(51421003)
关键词
固体充填沿空留巷
围岩稳定性控制
充实率
矸石带强度
矸石带宽高比
gob-side entry retaining with solid backfilling
surrounding rock stability control
filling ratio
strength of gangue belt
width/height ratio of gangue belt
