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隧道部分穿越强风化变质砂岩地段,变质砂岩部分已经泥化,岩层非常破碎,裂隙发育,裂隙充填物基本为夹泥。在雨季到来时,大量的地表水沿变质砂岩裂隙下渗,裂隙充填物软化脱落,流变性明显,部分岩层失稳,岩层间产生滑移导致塌方。根据隧洞收敛和拱顶下沉规律,采用钢拱架,配合小导管注浆,加固和稳定围岩,同时加强塌方处的监控量测。
Part of the tunnel through the strong weathered metamorphic sandstone, metamorphic sandstone has been part of mudstone, the rock is very broken, fissures, fractures filling basically mud clip. During the arrival of the rainy season, a large amount of surface water infiltrates along the fissures in the metamorphic sandstone, and the fissure filling softens and falls off. The rheological properties are obvious. Some of the rock layers are not stable and the slippage occurs between the rock layers. According to the rule of tunnel convergence and vault sinking, the steel arch frame is used, grouting with small pipes to reinforce and stabilize the surrounding rock and strengthen the monitoring and measurement at the landslide.