摘要
为研究三元煤矿3301工作面在复合水体(地表水和第四系松散含水层)薄基岩下厚煤层综放开采安全性,采用地质钻探方式确定了第四系底部粘土隔水层的覆存状态,采用数值模拟和现场实测方法研究了薄基岩条件下近第四系松散层底部综放开采顶板覆岩破坏和采动裂缝发育规律。探测结果表明,三采区第四系底部有一层稳定的粘土隔水层,能有效阻隔复合水体下渗和抑制导水裂缝带的上行扩展。数值模拟和实测结果表明导水裂缝带高度发育至第四系底部粘土层底界面。采用顶板水预先探放和留设防塌煤岩柱技术方案在薄基岩条件下实现了地表水体和第四系松散含水层复合水体下综放安全开采。
In order to study the safety of fully mechanized caving mining in the thick coal seam of the thin water bed of the composite water body (surface water and Quaternary loose aquifer) in 3301 working face in Sanyuan Coal Mine, geological drilling method was used to determine the storage state of the clay aquif in the bottom of the Quaternary. The numerical simulation and the field measurement method were used to study the overburden failure and mining crack development of the fully mechanized caving mining face near the bottom of the Quaternary loose layer under thin bedrock conditions. The detection results showed that there was a stable clay aquifer at the bottom of the Quaternary in the third mining area, which could effectively block the infiltration of the composite water body and inhibit the upward expansion of the water-conducting crack zone. The numerical simulation and the measured results showed that the water-conducting fracture zone was highly developed to the bottom interface of the clay layer at the bottom of the Quaternary. The technical scheme of pre-exploration and retention of anti-collapse coal pillars by roof water was adopted to realize safe mining of fully mechanized caving under surface water body and Quaternary loose aquifer composite water body under thin bedrock conditions.
作者
朱伟
Zhu Wei(China Coal Technology & Engineering Group Tangshan Research Institute, Tangshan 063012, China)
出处
《矿山测量》
2019年第4期1-4,20,共5页
Mine Surveying
基金
国家自然科学基金资助项目(51474129)
关键词
厚松散层
薄基岩
开采
导水裂缝带
突水
thick unconsolidated layers
thin bedrock
coal mining
water flowing fractured zone
water inrush
