盾尾刷更换时不同冻结加固方案温度场数值对比分析  

Numerical simulation comparative analysis of temperature field of different freezing and strengthening schemes for replacement of shield tail brush

作　　者：杨宁[1,2,3] 赵美霞 陈璐[4] 胡俊 YANG Ning;ZHAO Mei-xia;CHEN Lu;HU Jun(School of Architecture Construction,Jiangsu Vocational Institute of Architectural Technology,Xuzhou 221116,China;Jiangsu Collaborative Innovation Center for Building Energy Saving and Construct Technology,Xuzhou 221116,China;Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China;College of Civil Engineering and Architecture,Hainan University,Haikou 570228,China)

机构地区：[1]江苏建筑职业技术学院建筑建造学院,江苏徐州221116 [2]江苏建筑节能与建造技术协同创新中心,江苏徐州221116 [3]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [4]海南大学土木建筑工程学院,海南海口570228

出　　处：《兰州理工大学学报》2024年第6期119-126,共8页Journal of Lanzhou University of Technology

基　　金：江苏省高等学校自然科学研究项目(23KJA560004);江苏建筑节能与建造技术协同创新中心青年博士基金(SJXTBZ2112);江苏高校“青蓝工程”资助;海南省重点研发计划高新技术方向项目(ZDYF2024GXJS001);海南大学协同创新中心科研项目(XTCX2022STB09);海口市科技计划重点研发项目(2023-012)。

摘　　要：更换盾尾刷时,防治盾尾渗漏是盾构隧道施工过程重难点.针对管片上放射性直接打孔一圈(方案1)、盾尾冻结管+预埋冻结管管片(方案2)和设置2根环形冻结管(方案3)更换盾尾刷时三种不同的冻结加固方案,分别建立数值模型对比分析各方案形成的冻土幕温度场的发展规律.结果表明:三种方案最终形成的冻土幕可有效防治盾尾渗漏,所形成的冻土帷幕体积方案3>方案2>方案1;盾尾间隙交圈密封时间分别为17天、2天和5天,该处冻结效果方案2>方案3>方案1;方案1改进措施为一圈放射状冻结管尽量靠近盾尾间隙布设,方案2和3在实际工程中均可采用;在盾尾刷更换时冻结加固方案建议采用方案3.How to prevent shield tail leakage when replacing shield tail brushes is an important and difficult pointduring shield tunnel construction.In this paper,the shield tail brushes were replaced by‘directly drilling a circle of radioactive holes on the pipe segment’(scheme 1),‘shield tail freezing tube and pre-embedded freezing tube segment’(scheme 2)and‘setting 2 annular freezing tubes’(scheme 3),and a numerical model was established to compare and analyze the development law of the temperature field of the frozen soil curtain formed by each scheme.The results show that the frozen soil curtain formed by the three schemes can effectively prevent shield tail leakage,and the volume of the frozen soil curtain formed by scheme 3 is greater than scheme 2 and scheme 1.The sealing time for the gap between the shield tail and the ring is 17 days,2 days,and 5 days,respectively.The freezing effect at this location of scheme 2 is greater than scheme 3,and the scheme 1 has the worst effect.The improvement measure for scheme 1 is to arrange a radial freezing tube as close as possible to the gap between the shield tails.Scheme 2 and scheme 3 can be adopted in practical engineering,and it is recommended to adopt scheme 3 for freezing reinforcement during the replacement of the shield tail brush.

关 键 词：盾尾刷更换 冻结法 环形冻结 温度场 数值模拟 

分 类 号：U455[建筑科学—桥梁与隧道工程]