浅埋隧道施工方法的对比分析

Comparative Analysis of Shallow Tunnel Construation Methods

隧道工程由于选用不当的开挖方法将会导致工期长、造价高等问题.以西施坡隧道浅埋段为研究对象,分别对大拱脚台阶法、交叉中隔墙法开挖过程中隧道围岩应力、位移变化进行数值分析.研究结果表明:交叉中隔墙法能有效地控制塑性区发展、地表沉降和拱顶下沉,其最大拉应力为0.82MPa,远大于大拱脚台阶法的最大拉应力0.07MPa.

Inappropriate excavation methods used in tunnel construction often lead to extension of construction time and increase of cost. Choosing the appropriate excavation method is a problem existing in tunnel construction. With the shallow buried section of xishipo tunnel as the research object, the numerical analysis of the stress on surrounding rocks of the tunnel and displacement variation in the process of excavation using the arch spring benching method and CRD is implemented. Research shows that although the CRD method can effectively control the development of plastic zone, ground settlement and vault crown settlement, its maximum tensile stress is much greater than that of arch spring benching method. Considering the construction efficiency, safety, cost and other factors of the tunneling, the arch spring benching method is recommended in the construction of the shallow buried section of xishipo tunnel.