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一、某隧道溶洞处理某隧道全长687米,地质构造較为复杂,基岩为板状頁岩和块状灰岩,其复盖层0.5m～2.0m,在山坳处厚为5m左右。断裂溶洞相互穿插,质地較松軟,节理发达,风化較严重。在峒身有两个較大的溶蝕竪井,前者高6～10米,寬4～5米,长5～6米,地面有沉陷,后者高25米,寬18米,长20米,地面亦有沉陷,在施工中尚未見到明显的地下水。 (一)第一个溶蝕豎井的处理經过在导峒进至2897+01时,在左側岩层上有小的裂隙及喀斯持洞穴,为褐黃色亚粘土所填充,发現后認为是
First, a tunnel cave treatment A tunnel of 687 meters in length, the geological structure is more complex, the bedrock of plate-like shale and massive limestone, the cover 0.5m ~ 2.0m, the thickness of the col is about 5m. Broken karst interpenetration, the texture is more soft, developed joints, more severe weathering. There are two large corrosion shaft in the body, the former is 6 to 10 meters high, 4 to 5 meters wide, 5 to 6 meters long, the ground subsidence, which is 25 meters high, 18 meters wide and 20 meters long, Ground subsidence has not seen in the construction of groundwater. (I) Treatment of the first dissolution shaft After the guide tube was advanced to 2897 + 01, there were small cracks and karst caves on the left rock formation, filled with brownish yellow clay and found to be