某隧道工程地质条件特征及稳定性研究

Study on Engineering Geological Conditions and Stability of a Tunnel

拟建隧道全长约304.0 m,净高度9.17 m,净宽度12.10 m,是该道路的重要组成部分。通过场地工程地质调查,属基本稳定场地,适宜该次工程建设。隧道进、出口边坡在自然状态处于自稳状态,工程开挖后,可形成不稳定滑坡、崩塌等次生灾害,需进行边坡防护。隧道岩体坚硬程度较软,为破碎-较破碎型,围岩级别Ⅳ-Ⅴ,隧道施工过程中,侧壁有时失去稳定,可能产生较大的坍塌,需进行拱部无支护处理。

The planned tunnel with a length of about 304.0m,a net height of 9.17m and a net width of 12.10m,is an important part of a road.Geological survey for site engineering shows the site is largely stable to fit for this project construction.Inlet and exit slopes of the tunnel are naturally stable.With project excavation,secondary disasters such as unstable landslide and collapse occur,so slope protection is required.Rock mass of the tunnel is a soft,broken-broken type with IV-V level surrounding rock.As the side wall may destabilize to be major collapses during the tunnel construction,the arch need non-supporting treatment.