超浅埋超小净距花岗岩隧道中两种开挖工法的受力分析

Stress Analysis of Two Excavation Methods in Ultra-Shallow Buried and Ultra-Small Clear Distance Granite Tunnel

结合某隧道工程,提出“三台阶法+钢管桩”开挖工法,通过建立力学模型,模拟计算常规CD法开挖与“三台阶法+钢管桩”开挖的受力情况,并对2种工法经济效益进行分析。结果表明:应用“三台阶法+钢管桩”不仅缩短工期,而且经济效益更高。

Combined with a tunnel project,this paper puts forward"three steps method+steel pipe pile"excavation method,by establishing a mechanical model,the stress of conventional CD method and"three-step method+steel pipe pile"excavation is simulated and calculated.And the economic benefit of the two construction methods is analyzed.The results show that the application of"three-step method+steel pipe pile"not only shortens the construction period,but also has higher economic benefit.