水力发电2026，Vol.52Issue(1)：59-65,7.
顶管隧道施工掌子面极限支护压力计算及影响因素研究
Calculation of Critical Support Pressure at Tunnel Face during the Construction by Pipe Jacking and Influencing Factors Analysis
摘要
Abstract
Based on limit equilibrium theory,a face instability failure model that explicitly accounts for stratified ground conditions is developed,and an analytical expression for the critical support pressure is derived.The formula is verified using a finite-element model calibrated to the pipe-jacked tunnel section of the Hefei segment of the Yangtze-to-Huaihe Water Diversion Project,with parametric analyses evaluating the influence of ground properties on the ultimate support demand.The results indicate that:(a)the critical support pressures predicted by the proposed formula differ from the numerical results by less than 10%,thereby validating the rationality of the model and calculation formula;(b)the deformation is more pronounced in the upper half of the face,and with the increase of internal friction angle,the sensitivity of the required support pressure to cohesion diminishes,and moreover,both the increases of the internal friction angle and cohesion will lead to a decrease in the ultimate supporting pressure;and(c)despite the larger stress release induced by increasing the cover-to-diameter ratio,the concurrent gain in soil strength leads to a progressive reduction in the normalized ultimate support pressure.关键词
顶管隧道/掌子面稳定性/极限支护力/极限平衡理论/数值模拟Key words
pipe jacking tunnel/face stability/ultimate support pressure/limit equilibrium theory/numerical simulation分类
建筑与水利引用本文复制引用
ZHANG Jianghong,XU Qianwei..顶管隧道施工掌子面极限支护压力计算及影响因素研究[J].水力发电,2026,52(1):59-65,7.基金项目
国家重点研发计划(2023YFC3009401) （2023YFC3009401）
