连拱隧道施工工序对既有建筑桩基的影响分析

为研究连拱隧道开挖施工对近距离既有建筑桩基的影响,结合重庆市某连拱隧道建设工程,通过数值分析和理论计算相结合的方式,分析连拱隧道在不同开挖工序下其自身的位移沉降以及对周边建筑桩基的影响,优化施工工序。结果显示,在所研究的4种典型施工工况下,隧道右洞比左洞滞后40 m开挖这一工况既不增加先行洞位移和既有桩基位移,又能比设计方案提升近一倍的开挖进度。该计算结果可以有效地优化该连拱隧道开挖设计,对于指导施工也具有一定的现实意义。

Influence of Construction Process of Arch Tunnel on Existing Building Pile Foundation

This paper aims to study the effect of excavation construction of the arch tunnel in close range to existing buildings piles foundation. Based on an arch tunnel construction project in Chongqing, through the combination of numerical analysis and theoretical calculation, study the different construction steps of the arch tunnel on the influence of close range building pile foundation. Results show that in the four typical construction steps studied in this paper the working condition that the right hole of the tunnel opens 40 m after the left hole not only not increase the displacement of the first tunnel and existing pile tunnel displacement but also nearly double the excavation schedule than the design. Results of this paper can effectively optimize the arch tunnel design, also has certain practical significance for guiding the construction site.