大前石岭隧道进口岩堆体的稳定性分析评价

Stability Analysis and Evaluation of Rock Pile at the Entrance of Daqian Shiling Tunnel

摘要:

大前石岭隧道进口岩堆发育，覆盖层较厚，岩堆边坡表观上处于稳定状态，但在施工作业等人为作用以及外界环境扰动（如降雨、爆破等）作用下岩堆极易失稳。基于现状岩堆发育特征，分析隧道进口岩堆体失稳机理，从定性和定量的角度，给出现状和施工2种工况下隧道进口岩堆的稳定性评价，同时分析对路基、隧道等工程造成的危害，并给出处理措施建议，以保证隧道施工、线路运营的安全性，为工程建设中岩堆体诱发地质灾害的防治提供参考与借鉴。

Abstract:

The rock pile develop at the entrance of Daqianshiling tunnel with thick overburden and slope appearance of stable state, but it is easy to be unstable by artificial function of construction work and the disturbance of external environment (such as rainfall and blasting). Based on the development characteristics of rock pile, this paper analyzes the instability mechanism of rock pile at the tunnel entrance, and the stability evaluation of rock pile under static status and construction conditions at the tunnel entrance are detailed both in qualitative and quantitative views, and analyzes the damages to the subgrade, tunnel and some other engineering with treatment methods to ensure the safety of tunnel construction and line operation, which provides reference for the prevention and control of geological disasters caused by rock pile.