多因素下大直径电力隧道顶管诱发地表沉降研究  

Study on Ground Settlement Induced by Pipe Jacking of Large-diameter Power Tunnels under Multiple Factors

作　　者：叶井亮 袁哲 陈娟 曾聪[3] Ye Jingliang;Yuan Zhe;Chen Juan;Zeng Cong(Wuhan Yucheng Qianli Construction Co.,Ltd.,430051,China;Wuhan Water Construction Engineering Co.,Ltd.,430015,China;Faculty of Engineering,China University of Geosciences(Wuhan),430074,China)

机构地区：[1]武汉誉城千里建工有限公司,430051 [2]武汉市水务建设工程有限公司,430015 [3]中国地质大学(武汉)工程学院,430074

出　　处：《特种结构》2024年第4期75-81,共7页Special Structures

基　　金：国家自然科学基金青年项目(52008383)。

摘　　要：顶管施工过程中会对土体产生较大扰动,导致一定施工范围内的土体发生变形。本文依托南泥湾大直径电力隧道顶管工程,通过现数值模拟的方法探讨了摩擦系数、支护压力和注浆压力、管道埋深、管道直径对地表沉降的影响。结果表明:摩擦系数的增大,会使地表的沉降增加;支护压力在管道轴线上方的地表沉降产生影响,但超过二倍管径,则影响不大;适当的注浆压力能够抑制地表土体的变形;管道埋深会对地面最大沉降值和沉降槽宽度产生影响,并对地面的影响范围会扩大;管道直径的增加,会让管道周围土体最大沉降值增加,并且变化显著。研究结果可为控制顶管施工引起地表沉降措施提供参考。The construction process of pipe jacking inevitably disturbs the surrounding soil,causing deformation within a certain range.Taking the Nanniwan large-diameter power tunnel pipe jacking project as an example,this paper investigates the influence of multiple factors including friction coefficient,support pressure,grouting pressure,pipeline burial depth,and pipeline diameter on surface settlement through numerical simulation.The results indicate that the increase of friction coefficient leads to greater surface settlement.Support pressure affects surface settlement above the pipe axis,but its influence diminishes beyond twice the pipe diameter.Proper grouting pressure can mitigate surface soil deformation.The depth of the pipe affects both the maximum ground settlement value and the width of the settlement trough.Deeper burial depths expand the influence range.The increase in pipeline diameter will significantly increase the maximum settlement of the soil around the pipe.This study serves as a valuable reference for implementing measures to control surface settlement resulting from pipe jacking construction.

关 键 词：顶管 地表沉降 土体扰动 数值模拟 

分 类 号：TU994[建筑科学—市政工程]