摘要
针对万福矿井主井754.8 m超深厚冲积层冻结法凿井掘进和支护时存在的施工技术难题,开展了冻结壁稳定性、冻土掘进技术、高强高性能混凝土井壁支护技术等冻结井筒施工关键技术应用研究。采用冻土发展速度和测温孔实测温度2种方法推算开挖时间,确定了井筒的开挖时机。根据设计冻结壁厚度、设计冻结壁强度、冻结壁变形校核结果,确定了冲积层安全掘砌段高和井帮暴露时间。通过现场试验,采用伞钻配锚杆钻机机头、麻花钻杆、"Y"字形钻头钻凿冻土炮眼,选用耐低温型水胶炸药,采取炸药保温措施解决了冻土钻眼爆破的施工难题。开发了砂石筛洗装置、井上螺旋输送机输送混凝土系统和井下固定式分灰器,保证了高强高性能混凝土尤其是钢纤维混凝土的制作和输送质量,解决了深厚冲积层冻结井筒支护施工技术难题。
According to frozen drilling and support construction technology problem of main shaft in Wanfu Mine with 754. 8 m ultra deep and thick alluvium,this paper studied and practiced the key techniques of excavation and support in Wanfu Mine freezing sinking engineer- ing, including frozen wall stability, frozen soil tunneling technology, high performance concrete wall support. We used two methods to de- termine the time of excavation by calculating the pace of frozen soil development and measuring temperature of temperature-measuring hole. According to the design thickness and average temperature of frozen wall, we analyzed the frozen wall deformation. Based on the re- sults, the safe height of section and exposure time were determined for excavation alluvium. The umbrella drilling rig with bolt head, twist drill rod and Y shaped drill were used to drill borehole in frozen soil. Inorder to solve the fi＇ozen soil drilling and blasting construction problems, This paper select the low temperature and water gel explosives, and preserved heat for explosive. A series of high performance concrete production and transport techniques were adopted to guarantee the quality of high performance concrete lining, such as gravel wash screen means, underground mine concrete transport system and underground mine concrete fixed points ash, especially steel fiber re- inforced concrete lining in the deep freeze alluvium shaft support.
出处
《煤炭科学技术》
CAS
北大核心
2017年第8期90-97,141,共9页
Coal Science and Technology
关键词
深厚冲积层
冻结法凿井
掘砌
冻土钻眼爆破
钢纤维混凝土
ultra deep and thick alluvium
freeze sinking method
excavation and lining
drilling and blasting
steel fiber reinforced concrete
