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桂林市由碳酸盐岩组成的峰丛和峰林石山,天然溶洞发育,长期来人们还开挖了大量人工地下洞室,作为各种用途。本文根据调查资料,对桂林碳酸盐岩地下洞室围岩划分了五种类型和三种破坏类型,并从地质构造,岩溶、水文地质三方面对隧洞稳定的影响作了论述。提出了应避免隧洞平行和近于平行通过断裂带;隧洞位置应尽可能提高,远离地下水位附近的岩溶强发育带,避免洞底产生塌陷或溶洞破坏失稳。
Guilin has a series of carbonate rocks, including Feng Cong and Fenglin Mountain, with natural caves developed. For a long time, people also dug lots of artificial underground caverns for various purposes. Based on the survey data, this paper classified five types and three types of failure rock in the underground caverns of Guilin Carbonate. The paper also discussed the influence on the stability of the tunnel from three aspects: geological structure, karst and hydrogeology. It is proposed that parallel and nearly parallel tunnels should be avoided; the location of the tunnel should be raised as far as possible away from the strong karst zone near the groundwater level to avoid cave-in or cave-out of the cave.