基于流固耦合的拱北隧道开挖孔压及沉降分析

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• 英文论文题名：The analysis of fluid-mechanical interaction in the excavation for Gongbei Tunnel
• 论文作者：马程翔 ; 张冬梅 ; 李志宏
• 英文论文作者：Ma Chengxiang ; Zhang Dongmei ; Li Zhihong ; Key Lacboratary of Geotechnical and Underground Engineering of Ministry of Education ; Tongji University ; College of Civil Engineering ; Department of Geotechnical Engineering ; Tongji University ; The Management Center of Zhuhai Link Road of Hongkong-Zhuhai-Macao Bridge
• 年：2016
• 作者机构：同济大学岩土及地下工程教育部重点实验室;同济大学土木工程学院地下建筑与工程系;港珠澳大桥珠海连接线管理中心;
• 论文关键词：拱北隧道 ; 大直径 ; 流固耦合 ; 孔压场
• 英文论文关键词：Gongbei Tunnel ; large cross-section ; fluid-mechanical interaction ; pore pressure distribution
• 会议召开时间：2016-09-26
• 会议录名称：中国土木工程学会2016年学术年会论文集
• 语种：中文
• 分类号：U456.3
• 学会代码：OGTY
• 会议名称：中国土木工程学会2016年学术年会
• 会议地点：中国北京
• 主办单位：中国土木工程学会
• 学会名称：中国土木工程学会
• 页数：15
• 文件大小：2479k
• 原文格式：O
• 会议级别：全国

摘要

采用FLAC3D有限差分软件,利用基于流固耦合的数值模拟分析了大直径的港珠澳拱北隧道冻结管幕暗挖引起的土体位移、孔压变化等规律,探讨了隧道渗流场的分布特征。对比考虑与不考虑流固耦合的情况,研究了渗流场对于位移变化的影响。计算结果表明,在冻结管幕圈冻结情况完好的情况下,由于外界地下水无法向隧道内部流动,所以开挖施工对于孔压的扰动仅仅是由于力学扰动引起的。最大的正的超孔压产生于隧道侧墙上方,最大的负的超孔压位于隧道拱底底部土体。渗流的发生主要是由于力学扰动所积累的超孔压的消散引起的,最大的渗流矢量发生在管幕外侧与砂土层的交界处。是否考虑流固耦合效应对隧道横断面的位移发展规律影响不显著,但对位移量的大小有影响。
FLAC3D software is used to simulate the excavation of Gongbei tunnel,which is with a large cross-section and will be built based on freezing-pipe roofing method.The rules of displacement and pore pressure distribution are analyzed by the simulation considering fluid-mechanical interaction.Considering two cases with fluid-mechanical interaction or not to make a comparison with their displacement,pore pressure distribution.The calculations indicate that,under a certain condition that the freezing pipe roof is complete and inpermeable,water can't flow into the tunnel,so mechanical disturbance is the only factor that leads to the disturbance of pore pressure.The maximal positive excess pore pressure is located above the tunnel side wall,and the maximal negative excess pore pressure is located below the tunnel arch bottom.Fluid flow is caused by the dissipation of excess pore water pressure,and the biggest flow vector is at the junction of the pipe-roof and the layer of sand.The displacement rules of these two cases are similar in cross section of tunnel,and just have the difference in numerical magnitude.

引文

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