盾构-矿山法隧道并行施工的相互扰动分析

摘要

The pattern and extend of turbulence to surrounding rock,produced by the tunnel constructions are different between shield and mine tunneling methods.The mutual turbulence in tunnels in parallel proximity are to be different between shield and mine tunneling methods.This paper is based on the tunnel construction using both shield and mine tunneling methods in small clear distance in Baifo tunnel section in 1# route in Nanning Rail Transit.The monitoring system is established according to the real construction progress.The mutual turbulence in vertical and horizontal displacements produced by each other is analyzed.When the shield tunnel is constructed backward,the push function of the shield can promote the tunnel constructed with mine tunneling method forward to produce crown rising and clearance contraction.The soften function by the shield to the surrounding rock and the settlement function by the shield construction,can promote the tunnel constructed with mine tunneling method forward to produce crown settlement and clearance dilatation.When the tunnel with mine tunneling method is constructed backward,its side unloading function can promote the tunnel constructed with shield method forward to produce lining rising and clearance dilatation.The research results have revealed the mutual turbulence principle between the two parallel tunnels with shield and mine tunneling methods,which can supply technique support for the construction sequence choice and auxiliary construction measures choice,for similar small clear distance parallel tunnels.%盾构隧道和矿山法隧道的施工,对围岩扰动的形式和程度不同;并行近接情况下,对彼此的扰动也将不同.以南宁轨道交通地铁1号线百佛区间的盾构-矿山法隧道小净距并行施工为研究对象,根据实际施工进度情况建立监测分析系统,分析了盾构-矿山法施工在竖直和水平方向位移的相互扰动.盾构法隧道后行,盾构的挤推作用,导致先行矿山法隧道拱顶上升、净空收缩;盾构弱化围岩和盾构沉降影响区的作用,导致先行矿山法隧道拱顶下沉、净空扩容.矿山法隧道后行,矿山法隧道侧向卸荷作用,导致先行盾构隧道管片产生管片隆起和净空扩容.研究成果揭示了小净距并行施工时,盾构隧道-矿山法隧道相互间的扰动规律;可以为类似小净距并行隧道施工顺序的选择,及相应辅助施工措施的采用,提供技术支撑.