苏通GIL综合管廊工程盾构隧道管片结构安全性评估#br#

为了探明高水压作用下大断面盾构隧道管片结构的安全性，依托苏通GIL综合管廊工程项目，选择5个控制断面作为研究对象，利用多功能盾构隧道结构体加载装置，对管片结构开展原型加载试验； 基于混凝土结构偏心受压极限承载力理论，推导出管片结构的M-N承载力曲线，并提出管片结构的安全性评价指标。研究表明： 管片结构的弯矩呈现出“蝶状”分布，轴力呈现出“圆状”分布，最大正弯矩和最大轴力均出现在拱顶位置； 5个控制断面管片结构的试验内力均在承载力曲线包络范围内，管片结构均处于安全状态； 管片结构安全系数沿圆周分布不均，拱顶安全系数小于其他位置，管片结构的安全系数为2.12-2.91，设计满足安全性要求。

Safety Evaluation of Shield Tunnel Segment Structure of Sutong GIL Utility Tunnel Project

In order to verify the safety of segment structure of large cross section shield tunnel under high water pressure, 5 control cross sections of Sutong GIL utility tunnel project are selected as the research object to carry out prototype loading test on the segment structure by multi functional shield tunnel structure loading device. Based on the theory of eccentric compression ultimate bearing capacity of concrete structure, M N bearing capacity curve of segment structure is derived, and safety evaluation index of segment structure is put forward. The research results show that: (1) The bending moment of the segment structure shows a butterfly shaped distribution, and the axial force shows a circular shaped distribution; the maximum positive bending moment and the maximum axial force appear on the crown. (2) The test internal forces of the segment structure of selected 5 control cross sections are all within the envelope of the bearing capacity curve, which is in a safe state. (3) The safety coefficient of the segment structure is unevenly distributed along the circumference; the safety coefficient of crown is smaller than other positions; the safety coefficient of segment structure ranges from 2.12 to 2.9, which meets safety requirements.