大直径超深圆竖井内衬逆顺结合作法施工过程温度应力研究  

Research on Temperature Stress during the Construction Process of Large Diameter and Ultra Deep Circular Vertical Shaft Lining Using Reverse Combination Method

作　　者：于书萍 张忠举 欧阳海滨 王振红[3] YU Shuping;ZHANG Zhongju;OUYANG Haibin;WANG Zhenhong(Beijing Jianghe Zhongji Engineering Consulting Co.,Ltd.,Beijing 100073,China;Sinohydro Bureau 10 Co.,Ltd.,Chengdu 611830,Sichuan,China;Department of Structure and Materials,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]北京江河中基工程咨询有限公司,北京100073 [2]中国水利水电第十工程局有限公司,四川成都611830 [3]中国水利水电科学研究院结构材料研究所,北京100038

出　　处：《水力发电》2024年第2期71-77,共7页Water Power

基　　金：国家重点研发计划项目(2021YFC3090102,2021YFC-3090104);国家自然科学基金资助项目(52192672);流域水循环模拟与调控国家重点实验室自主研究项目(SKL2022ZD05)。

摘　　要：珠江三角洲水资源配置工程A2标03号盾构井为外径35.9 m圆形竖井、开挖深度达73.98 m,施工复杂且难度较大,保证施工过程中不出现温度裂缝尤为重要。针对此问题,根据结构、施工特点,将盾构井内衬分为内衬墙、洞门墙和底板3个部分,使用三维有限元程序,采用逆-顺结合施工方法,基于内衬混凝土施工方案,对内衬结构施工过程进行数值模拟,研究内衬墙、洞门墙和底板温度、应力发展情况。数值模拟结果表明:(1)内衬墙、洞门墙和底板降温速率分别为0.28、0.23、0.19℃/d;(2)随着高程的降低,盾构井温控难度逐步下降,内衬墙厚度较小,受地下连续墙约束和气温变化影响较大,在高温季节浇筑的部位开裂风险较大,低温季节浇筑的洞门墙和底板开裂风险较小;(3)洞门墙和底板由于施工工序和间歇期,在结构突变连接处出现较大应力,施工中要加强这些部位的监测。The No.03 shield shaft of Lot A2 of the Water Resources Allocation Project in Pearl River Delta is a circular shaft with an outer diameter of 35.9 m and an excavation depth of 73.98 m.The construction of this circular shaft is complex and difficult,so it is particularly important to ensure that no temperature cracks occur during construction.To solve this problem,the lining of shield shaft is divided into three parts of the lining wall,the portal wall and the bottom plate according to the structure and construction characteristics,and the numerical simulation of the construction process of lining structure which adopting inverse CIS construction method is carried out to study the temperature and stress development of the lining wall,portal wall and bottom plate using three-dimensional finite element program and based on the construction scheme of lining concrete.The numerical simulation results show that:(a)the cooling rates of lining wall,portal wall and bottom plate are 0.28,0.23℃/d and 0.19℃/d respectively;(b)withthedecreaseof elevation,thetemperaturecontrol difficulty of shield shaft gradually decreases,and as the thickness of lining wall is smaller,the stress is greatly affected by the constraints of underground diaphragm wall and temperature changes,in which,the risk of cracking of the parts poured in high-temperature season is greater and the risk of cracking of the portal wall and bottom plate poured in low-temperature season is smaller;and(c)due to the construction process and intermittent period,the portal wall and bottom plate have large stress at the sudden change connection of the structure.The monitoring of these parts should be strengthened during the construction.

关 键 词：盾构井 混凝土内衬 施工过程 数值模拟 温度应力 

分 类 号：TV315[水利工程—水工结构工程]