隧道漏斗状巨型溶洞处治技术研究

Study on treatment technology of tunnel funnel-shaped giant karst cave

以大关至永善高速新坪隧道施工过程中遇到的漏斗状巨型溶洞为例,选取节能环保、可靠性、经济性、施工工期、可操作性、运营维护、行车舒适性7种指标,采用模糊数学多目标层次分析法建立综合模糊评价体系,研究了改线避绕、回填暗挖、回填+明洞、桥梁+明洞、桥梁+钢棚洞五种方案,最终计算得到“桥梁+钢棚洞”为新坪隧道漏斗状巨型溶洞最优处治方案。

Taking the funnel-shaped giant karst cave encountered in the construction of Xingping tunnel of Daguan-Yongshan expressway as an example,selects seven indicators of energy conservation and environmental protection,reliability,economy,construction period,operability,operation and maintenance,and driving comfort,establishes a comprehensive fuzzy evaluation system by using fuzzy mathematics multi-objective analytic hierarchy process,and five schemes of diversion and avoidance backfilling,concealed excavation backfilling+open cut tunnel,bridge+opencut tunnel,bridge+steel shed tunnel are studied,and the final calculation shows that"bridge+shed tunnel"is the best treatment scheme for the funnel-shaped giant karst cave of Xinping tunnel.