【作者】 魏纲； 郭志威； 魏新江； 陈伟军；

【Author】 WEI Gang~1,GUO Zhi-wei~(1,2),WEI Xin-jiang~(1,2),CHEN Wei-jun~(1,2) (1.Department of civil engineering,Zhejiang University City College,Hangzhou 310015,China; 2.Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China)

【机构】 浙江大学城市学院土木工程系； 浙江大学岩土工程研究所；

【摘要】 对盾构出洞口涌水涌砂灾害问题作了分析。利用Midas-GTS软件,建立了盾构出洞施工的有限元模型。考虑盾构出洞施工的渗流-应力耦合效应,研究了盾构工作井外加固土体前方高水位工况下,地下水绕加固土体下卧土层的渗流规律以及加固土体前方原状土的沉降规律。研究结果表明:在假定井外加固土体完全隔水情况下,洞门涌土灾害的发生与否受到土体加固长度、井外地下水等因素影响:土体加固长度的增加对工程安全有利,但成本较高;地下水位的降低能有效减小盾构出洞洞门涌水灾害的发生,需综合考虑工程安全性、经济性和工期等来确定合理的施工参数。更多还原

【Abstract】 The causes of piping and sand boiling of shield launching is analyzed,and the FEM model of shield launching is established using Midas-GTS software.Considering coupled seepage and stress,the groundwater permeates from reinforced soil pervious underlying layer to wall is analyzed.A example is given to demonstrate that,suppose the reinforced soil is impervious,the accident that water and sand inflows from tunnel portal is influenced by length of soil reinforcement and groundwater level;the cost and safety of engineering have the positive correlation with the length of reinforced soil,the aggressive influence of decreasing groundwater level. The factors are mutual constraint,construction parameters are influenced by economy,security and time limit for a project.更多还原