Karst cave is underground dissolution phenomenon under the influence of surface water and groundwater on soluble strata by chemical and mechanical process. Dissolution may cause partial or overall dangling of certain parts which may greatly reduce the reliability of the tunnel. It may also result in the emission of fillings from the karst cave consequently cause difficulties and risks for construction. Seasonal water inflow into the karat cave may unsafe and unstable factor for the construction and tunnel system. Therefore, based on the treatment program of karst cave DI2K24 ＋ 932 of Hujiapo Tunnel on Bailong Line of Guizhou Hub it is significant to summarises the treatment of the karst cave in the development area of the karst region in Guizhou which certainly can provide reference for the design and construction of karst cave treatment.%溶洞为岩溶洞穴，是地表水和地下水对溶性岩层经过化学作用和机械破坏作用而形成的地下溶蚀现象。岩溶对隧道的影响主要表现为结构物部分及全部悬空，大大降低隧道使用的可靠度；溶洞填充物外涌。给施工造成困难和安全隐患；季节性的岩溶洞穴涌水，给隧道施工和体系带来不安全和不稳定因素。因此，制定合理、科学、有效的溶洞处理方案对隧道顺利穿越岩溶发育地段极为重要。
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