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地下煤炭资源的开采造成了采空区,采空区的稳定性对公路建设的工程设计、施工方法、公路工程质量等工作均产生直接影响,其中对隧道工程围岩稳定性和围岩级别的划分有严重影响,公路采空区的勘察与治理作为公路建设的基础环节就显得尤为重要。本文选取山西省国道307线柳林县城区段公路改线工程中张家湾2号隧道采空区勘察为典型案例,分析了开采时间、开采方式、埋藏深度、上覆岩体特征等因素对采空区地基稳定性的影响,通过定量计算评价采空区的地基稳定性,划分采空区冒落带、裂隙带的范围,为采空区治理设计提供可靠地质依据。
The underground coal resources mining caused the goaf. The stability of the goaf has a direct impact on the engineering design, construction method and highway engineering quality of the highway construction. Among them, the stability of surrounding rock and the surrounding rock level The division has a serious impact. As a basic link in highway construction, the survey and governance of highway gob area becomes more and more important. This paper chooses the investigation of the gob roof of Zhangjiawan No.2 Tunnel in the rebuilding project of 307 National Highway in Liulin County of Shanxi Province as a typical case and analyzes the influence of mining time, mining methods, burial depth and overlying rock mass characteristics on mining The stability of the foundation in the empty area, the stability of the foundation of the mined-out area is evaluated by quantitative calculation, and the scope of the caving zone and the fracture zone is defined. This provides a reliable geological basis for the goaf design.