基于等效理论的水下双孔隧道渗流场半解析研究  

Semi-analytical study on seepage field of underwater twin tunnels based on equivalent theory

作　　者：潘以恒 罗其奇 阮彩添 陈超[1] PAN Yiheng;LUO Qiqi;RUAN Caitian;CHEN Chao(College of Harbour and Coastal Engineering,Jimei University,Xiamen 361000,China;School of Civil Engineering,Central South University,Changsha 410075,China;Xiamen Branch,China National Aviation Fuel Supply Co.,Ltd.,Xiamen 361006,China)

机构地区：[1]集美大学港口与海岸工程学院,福建厦门361000 [2]中南大学土木工程学院,湖南长沙410075 [3]中国航空油料有限责任公司厦门分公司,福建厦门361006

出　　处：《人民长江》2024年第7期204-211,共8页Yangtze River

基　　金：福建省中青年教师教育科研项目(JT180256);福建省自然科学基金青年创新项目(2020J05145)。

摘　　要：为研究隧道设计参数对水下双孔隧道渗流场的影响,建立了水下双孔平行隧道渗流计算模型。运用Abaqus软件构建数值模型,以隧道埋深、双孔间距和支护结构参数为影响因素,分析各因素对解析解计算误差的影响以及支护结构外水压力的变化特征,并采用灰色关联理论研究各影响因素的敏感度。最后,基于数值计算结果对解析解进行修正,得到计算精度较高的半解析解。结果表明:二次衬砌结构参数对初期支护外水压力的折减幅度影响较大,埋深、间距和注浆圈参数对初期支护外水压力的折减幅度影响较小。支护结构渗透系数对拱顶处解析解计算误差影响较大,支护结构厚度对拱底处解析解计算误差影响较大。埋深与等效半径之比小于19时,解析解计算误差大致为12%。注浆圈渗透系数与二次衬砌渗透系数之比小于20时,拱顶处解析解计算误差超过10%。注浆圈渗透系数对拱顶处解析解计算误差影响较大,隧道埋深对拱底处解析解计算误差影响较大。To study the influence of tunnel design parameters on seepage field of underwater twin tunnels,a seepage calculation model of underwater twin tunnels with two-hole was established.Abaqus was used to build a numerical model.The tunnel burial depth,double hole spacing and support structure parameters were chosen as influencing factors,and the influence of each factor on calculation error of analytical solution based on equivalent method and the variation characteristics of external water pressure acted on the composite lining structure were analyzed.The sensitivity of each influencing factor was studied by grey correlation analysis.Finally,based on the numerical results,the analytical solution was modified and a semi analytical solution with high accuracy was obtained.The result shows that the structural parameters of secondary lining have a significant impact on the reduction of the external water pressure acted on the primary support,while the burial depth,tunnel spacing,and grouting parameters have relatively small impacts on the reduction of the external water pressure on primary support.The permeability coefficient of the support structure has a significant impact on the calculation error of the analytical solution at the vault,and the thickness of the support structure has a significant impact on the calculation error at the arch bottom.When the ratio of burial depth to equivalent radius is less than 19,the calculation error of the analytical solution is approximately 12%.When the ratio of the permeability coefficient of grouting ring to the permeability coefficient of secondary lining is less than 20,the calculation error at the arched bottom exceeds 10%.The permeability coefficient of grouting layer has a large influence on error of analytical solution at vault,while the burial depth has a large influence on error of analytical solution at arch bottom.

关 键 词：水下双孔隧道 渗流 半解析解 灰色关联分析 外水压力 

分 类 号：U452.11[建筑科学—桥梁与隧道工程]