高水压作用下衬砌管片构件氯离子侵蚀数值模拟研究  

Study on Numerical Simulation of Chloride Ion Erosion of Lining Segment Components under the Action of High Hydraulic Pressure

作　　者：陈立保[1] 封坤[2] 孙文昊[1] 邢文杰 潘瑾 耿珺洋 王俊玲 CHEN Libao;FENG Kun;SUN Wenhao;XING Wenjie;PAN Jin;GENG Junyang;WANG Junling(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031;3rd Agent Construction Project Department)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]西南交通大学交通隧道工程教育部重点实验室,成都610031 [3]第三代建项目部,成都610031

出　　处：《现代隧道技术》2024年第3期131-140,共10页Modern Tunnelling Technology

基　　金：国家重点研发计划(2021YFB2600900);国家自然科学基金(51878569,52078430)。

摘　　要：为探究高水压作用下氯离子在管片结构中的运移与分布规律,明确外水压条件、氯离子浓度、孔隙水压力、侵蚀时间等因素对衬砌管片侵蚀规律的影响,以青岛胶州湾第二海底隧道为依托工程,采用COMSOL Multiphysics■有限元平台建立高水压作用下饱和-非饱和条件衬砌管片的氯离子侵蚀运移数值模型,采用结构力学模块(solid)、桁架模块(truss)以及多孔介质稀物质传递模块(tds)和理查兹方程模块(dl)模拟管片模型构件在压弯荷载、高水压和离子浓度耦合作用下的氯离子侵蚀规律。结果表明:高水压作用下氯离子在管片构件中的对流作用主要受水头控制,而扩散作用主要受浓度梯度影响,可将氯离子浓度-深度曲线分为对流水平段、过渡段和扩散段。In order to investigate the migration and distribution pattern of chloride ions in segment structure,and determine the impact of the factors such as external hydraulic pressure conditions,chloride ion concentration,pore water pressure and erosion time on the erosion pattern of lining segment,the Jiaozhou Bay 2nd subsea tunnel in Qingdao is used as an example in this study.The numerical model for chloride ions erosion and migration in lining segment in saturated and non-saturated conditions under the action of high hydraulic pressure is created by using the COMSOL Multiphysics®finite element platform.The structural mechanics module(solid),truss module(truss),porous media dilute substance transfer module(tds)and Richards equation module(dl)are used to simulate the chloride ions erosion pattern of segment model component under the coupling action of bending load,high hydraulic pressure and chloride ion concentration.As the results indicate:The convection of chloride ions in a segment component under the action of high hydraulic pressure is mainly controlled by the water head,while their diffusion is mainly affected by concentration gradient.The chloride ion concentration-depth curve can be divided into the convection segment,transition segment and diffusion segment.

关 键 词：海底盾构隧道 管片 耦合作用 氯离子侵蚀 高水压 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]