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某隧道全长1 799 m,最大埋深约276 m,设计为单洞双向行驶车道,按40 km/h三级公路标准设计。隧道内轮廓净宽10.00 m,净高7.50 m。勘察中采用工程地质测绘,并采用钻探、野外原位测试、地球物理勘探、抽水试验、土工试验、波速测试等手段对勘察区进行详细的工程地质和水文地质勘察,对隧道的稳定性进行评价,划分出勘察区内的Ⅴ级围岩段总长843 m,占隧道全长46.8%;Ⅳ级围岩段总长956 m,占隧道全长53.2%。因层间破碎带发育,建议按Ⅴ级围岩支护。利用多种方法预测出隧道正常涌水量为7885 m3/d,最大涌水量为200 000 m3/d。据隧道的地质情况推断认为,隧道开挖时可能产生涌水、突泥、突石等地质灾害,并提出防治建议。
A total length of 1 799 m tunnels, the maximum depth of about 276 m, designed as a single-lane two-way lanes, according to 40 km / h Class 3 highway standard design. The outline of the tunnel has a net width of 10.00 m and a net height of 7.50 m. Geological surveying and mapping is adopted in the survey, and detailed engineering geology and hydrogeological investigation are conducted in the survey area by means of drilling, in-situ field test, geophysical prospecting, pumping test, geotechnical test and wave velocity test to evaluate the stability of the tunnel The total length of Grade V surrounding rock is 843m, accounting for 46.8% of the total length of the tunnel. The grade IV rock is 956m in length, accounting for 53.2% of the total length of the tunnel. Due to the development of crushing zone, it is suggested to press Ⅴ grade rock support. A variety of methods are used to predict the normal inflow of tunnels to 7885 m3 / d and the maximum inflow of 200 000 m3 / d. According to the geological conditions of the tunnel, it is concluded that geological disasters such as gushing water, mud and rock may occur during the tunnel excavation, and prevention and treatment suggestions are put forward.