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高速公路建设中,地下采空区问题一直是一个棘手的问题,上世纪非法无序乱采滥挖遗留的大量小煤窑采空区对新建隧道施工安全和结构稳定影响极大。结合杭瑞高速公路遵义至毕节段第20合同段谢都隧道工程,分析了小型采空区的特点及施工风险,探讨了隧道拱顶相对采空区底板不同径向距离时的风险分级与安全施工技术措施。隧道安全通过采空区地段,为今后类似工程施工提供借鉴经验。
In the highway construction, the underground mined-out area has always been a thorny issue. The large number of goafs left over from the indiscriminate indiscriminate excavation and dredging in the last century have a great impact on the construction safety and structural stability of the new tunnels. Combined with the Xiedu tunnel project of the 20th contract section of Zunyi-Bijie section of Hangrui Expressway, the characteristics and construction risks of small-scale goaf are analyzed, and the risk classification and safety of tunnel dome with different radial distance to the bottom of goaf are discussed. Construction technical measures. Tunnel safety through the gob area for similar projects in the future to provide reference experience.