风火山隧道地应力测量及工程稳定性分析

Stress Measurement and Engineering Stability Analysis at Fenghuoshan Tunnel

为了解风火山隧道应力状态,在隧洞内及附近地区进行了6个点地应力测量,首次在风火山地区取得了应力实测资 料。测量结果表明:风火山地区最大水平主应力量值为5.5 MPa,方向为NE至NEE,应力量值与其他地区表层地应力测量 结果比较,属中等应力水平;应力方向与风火山地区活动断裂调查所表征的现今区域应力场比较吻合。在地应力实测基础 上,还必须结合隧道区工程地质、水文地质条件以及地震活动性,进行隧道稳定性综合分析。

In order to detect the stress state of Fenghuoshan tunnel, the authors made stress measurement at six points around Fenghuoshan tunnel, and obtained the first data in Fenghuoshan area. The results indicate that the maximum horizontal stress is 5.5 MPa in Fenghuoshan area, and the direction is between NE and NEE. The stress value is at the medium level compared with surface stress values from other areas of China. The stress directions are quite in agreement with the present regional stress field as shown by investigation of active faults in the same area. On the basis of stress measurement in combination with engineering geological and hy-drogeological conditions and earthquake activities, the tunnel stability can be analyzed in an integrated way.