摘要
为了解决极近距煤层巷道支护技术难题,分析巷道围岩特征及变形规律,总结已有支护形式,提出围岩控制原理。概括为:①利用高强度锚杆施加的高预应力,把巷道开挖初期形成的叠合梁顶板转变成组合梁顶板,显著降低煤岩层顶板的挠度和应力,提高顶板浅部煤岩层的强度,增强其承载能力;②采用短锚索提供高预紧力,串联顶板深浅部煤岩层,增大组合梁的厚度和强度,再降低煤岩层顶板的挠度和应力,提高顶板整体结构的稳定性;③选用高强度锚杆加强两帮支护,控制煤帮变形和破坏,确保巷道整体稳定。据此提出水峪矿5116面运输巷支护设计,巷道围岩变形得到显著控制。
In order to solve technical problems of the gateway support in an ultra closed seam, the paper analyzed the surrounding rock features and deformation law of the gateway, summarized the available support modes and provided the principle of the surrounding rock control. The paper summarized that ① the high pre - stress set by the high strength bolt could be applied to make the congruential beam roof formed at the initial excavation period of the mine roadway converted to a combined beam roof. The roof deflection and stress of the seam and rock stratum was obviously reduced, the strength of the seam and rock stratum closely under the roof was improved and the loading capacity of the seam and rock was increased. ② The short anchor was applied to provide a high pretension to connect the seam and rock stratum closely under the roof, to increase the thickness and strength of the combined beam, to reduce the roof deflection and stress of the seam and rock stratum and to increase the stability of the completed structure of the roof. ③ The high strength bolt was applied to reinforce the support of the two sidewalls, to control the deformation and failure of the side coal wall and to ensure the completed stability of the gateway. Thus a support design of the transportation gateway in No. 5116 coal mining face was provided. The deformation of surrounding rock along the mine gateway was obviously controlled.
出处
《煤炭工程》
北大核心
2013年第8期27-30,共4页
Coal Engineering
基金
国家科技支撑计划资助项目(2012BAK04B06)
关键词
极近距煤层
围岩控制
锚杆支护
高预应力
短锚索
ultra closed seams
surrounding rock control
bolt support
high pre - stress
short anchor
