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沙坡隧道位于盘西铁路红(果)土(城)段。洞身穿过三迭系中统关岭组上段(T_(29)~3)的厚块状石灰岩夹中薄层白云质灰岩。岩层平缓,产状为N48W/2～8W,节理多为闭合型,大多被石灰华所充填。此处岩溶极为发育,严重患及隧道衬砌和路基稳定的里程为D_5B119+20～120+22,计102米。隧道路基面下的溶洞顶板厚3～17米,其下的溶洞暗河为相互连通的三层:上层无水流;中层为间歇性水流;下层有常流水,也是暗河现代河床的所在。详见图1。
Shapo tunnel is located in the red (fruit) soil (city) section of Panxi Railway. The cave body passes through thin-bedded dolomitic limestone in thick limestone clips of the Upper Triassic Guanling Formation (T_(29)~3). The rock formations are gentle, and the occurrence is N48W/2~8W. The joints are mostly closed and most of them are filled with travertine. The karst area is extremely developed here, and the length of the severely affected tunnel lining and roadbed is D_5B119+20~120+22, which is 102 meters. The thickness of the karst cave under the tunnel base is 3 to 17 meters. The karst cave below it is connected with three layers: the upper layer of no water flow; the middle layer of intermittent water flow; the lower layer of constant flow of water, is also the location of the dark river modern riverbed. See Figure 1 for details.