摘要
为解决深部工作面沿空巷道因超前支承压力过大引起导致巷道变形量大以及易发生冲击地压的问题,基于分段分级承载原理提出复合墙体巷旁支护技术。复合墙体以矸石砖墙作为主墙体,以无机充填材料瑞米Ⅲ号作为副墙体,通过对沿空留巷顶板进行力学分析,计算出顶板下沉量及墙体支护强度。由实验室试验可知矸石砖的支护强度为10.4 MPa,完全能够满足墙体所承受的顶板压力;副墙体设计高度为0.4 m即可满足让压的需要,又能保证主墙体的支撑作用。结果表明:运用复合墙体支护技术能够有效控制巷道变形、防止冲击地压事故发生,解决了工作面沿空巷道超前支承压力过大的问题,同时解决了煤矸石污染环境的问题。
In order to solve a large deformation of mine gateway and mine strata pressure bump caused by the overhigh advance support pressure of the gateway retained along the goaf in a deep coal mining face,a composite wall roadside support technology was provided based on a sectional and stage loading principle. The composite wall mainly was a coal refuse brick wall as the main wall mass and an inorganic backfill material Ruimi No. 3 as auxiliary wall mass. With a dynamics analysis conducted on a roof of the gateway retained along the goaf,the roof subsidence value and the wall support strength were calculated. The lab experiment showed that the support strength of the coal refuse brick was 10. 4 MPa and could fully meet the roof pressure born by the wall mass. The designed height of the auxiliary wall mass was0. 4 m,could meet the requirement of the yield pressure and could ensure the support role of the main wall mass. The results showed that the composite wall support technology could effectively control the deformation of the gateway,could prevent the mine strata pressure bump accident occurred,could solve overhigh advance support pressure of the gateway retained along the goaf in the coal mining face and could solve the environment pollution problems by the coal refuse.
出处
《煤炭科学技术》
CAS
北大核心
2014年第12期32-36,共5页
Coal Science and Technology
关键词
沿空留巷
分段分级承载原理
矸石墙
巷旁支护
gob-side entry retaining
sectional and stage loading principle
coal refuse wall
gateway sidewall support
