盾構(gòu)隧道下穿管道施工引起的管道水平位移研究

管凌霄 徐長(zhǎng)節(jié) 可文海 丁海濱 張高鋒 虞巍巍

摘 要：采用兩段法研究了盾構(gòu)隧道下穿管道施工引起的管道水平變形特性，在第1階段改進(jìn)了Loganathan公式，求得盾構(gòu)隧道以任意角度下穿管道施工引起的管道軸線處土體水平位移，第2階段采用Vlasov模型模擬管土相互作用，并求得管道水平位移解析解。通過與工程監(jiān)測(cè)數(shù)據(jù)及有限元計(jì)算結(jié)果的對(duì)比，驗(yàn)證了方法的正確性，并進(jìn)一步分析了管道與隧道夾角、管道直徑以及隧道埋深對(duì)管道變形的影響。結(jié)果表明：盾構(gòu)隧道斜下穿管道施工時(shí)，隧道與管道相交角度的大小對(duì)管道水平位移造成的影響顯著，隨著夾角的減小，管道的水平位移逐漸增加;當(dāng)管道與隧道相交角度較小時(shí)，盾構(gòu)隧道開挖引起的管道水平位移相對(duì)管道豎向沉降不可被忽略;隨著管道直徑的增大、隧道埋深的增加，盾構(gòu)隧道斜交下穿管道施工引起的鄰近管道變形均減弱。

關(guān)鍵詞：盾構(gòu)隧道;管道位移;管道;兩階段方法;相互作用

中圖分類號(hào)：U455.43;TU433 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：2096-6717（2020）06-0054-09

Abstract： The two-stage method is used for analyzing the pipeline deformation caused by the underneath shield tunneling. In the first stage， the Loganathan formula is modified for studying the ground loss when the tunnel axis intersection with the pipeline axis is not orthogonal. The soil-pipeline interaction is studied based on the Vlasov model in the second stage， and the pipeline deformation is also obtained. Then， through comparison with the finite element results， the proposed method was verified to be correct. The influences of pipeline diameter; tunnel depth and intersection between the tunnel and pipeline on pipeline deformation have been further studied. The parametric study shows that the intersection angle of the tunnel and the pipeline significantly influences the pipeline horizontal displacement， and the pipeline deformation increases remarkably as the intersection angle decreasing. The parametric study indicates： a. the pipeline horizontal displacement cant be ignored compared to the pipeline vertical displacement when the intersection angle of the tunnel and the pipeline is relatively small; b. the pipeline deformation is weakening as the pipeline diameter and tunnel depth increasing.

Keywords：shield tunnelling; displacement of pipe; pipe; two-stage method; interaction

盾構(gòu)隧道在掘進(jìn)過程中會(huì)引起地層損失[1]，使鄰近管道產(chǎn)生變形甚至破壞。城市地下管道是城市的生命線，如何全面分析盾構(gòu)隧道開挖對(duì)鄰近管道變形的影響，成了城市地鐵工程中亟待解決的熱點(diǎn)問題[2-3]。

目前，在盾構(gòu)隧道下穿管道施工引起的管道變形理論研究中，兩段法是常用方法[4]，即將盾構(gòu)隧道開挖對(duì)鄰近管道變形的影響研究分為兩個(gè)階段[5]：第1階段分析盾構(gòu)隧道開挖引起的管道軸線處土體位移;第2階段將管道位置處的土體位移轉(zhuǎn)化為荷載施加到管道上，再采用合理的彈性地基梁模型模擬管土相互作用求解出管道變形的解析解。……