盾构隧道的液化危害性分析  

Analysis of Liquefaction Hazard in Shield Tunnels

作　　者：邵帅[1] 邵生俊[1,2] 郑芸昕 SHAO Shuai;SHAO Shengjun;ZHENG Yunxin(Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China;Shaanxi Key Laboratory of Loess Mechanics and Engineering, Xi'an 710048, Shaanxi, China)

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]陕西省黄土力学与工程重点实验室,陕西西安710048

出　　处：《地震工程学报》2020年第6期1615-1622,共8页China Earthquake Engineering Journal

摘　　要：目前对地下结构液化破坏的研究尚不完善,很有必要对地铁隧道等地下结构可液化土层的液化势进行分析。本文以太原地铁隧道液化破坏为研究对象,应用Tokimatsu和Yoshimi,Seed,Japan Road Associate和中国建规4种方法,分析其抗液化性,评价场地的整体液化风险;依据振动液化动剪应力比、抗液化安全系数、标贯击数与体应变的关系评价盾构隧道的液化沉降变形。在粉质砂土和黏质粉土盾构隧道仰拱基底二次灌浆抗液化的基础上,建议太原地铁可液化砂土地层采用水泥基悬液二次灌浆加固处理地基,以提高其抗液化能力,减小液化沉降变形。The current status of research on liquefaction failure in underground structures is not ideal.It is necessary to analyze the soil liquefaction potential of underground structures such as subway tunnels.In this paper,the anti-liquefaction safety of the Taiyuan metro tunnel was analyzed using four methods,i.e.,those used by Tokimatsu and Yoshimike,Seed,the Japan Road Association,and the Chinese code.The overall liquefaction risk level of the site was evaluated.Based on the dynamic shear-stress ratio of vibration liquefaction,the anti-liquefaction safety factor,the relationship between the standard penetration test number and volumetric strain,and the liquefaction settlement deformation of the shield tunnel were evaluated.By the adoption of the anti-liquefaction technique of secondary grouting of the shield tunnel in silty sand and the clay silt stratum,it is suggested that secondary grouting of a cement-based suspension be used to reinforce the foundation of the Taiyuan Metro to improve its anti-liquefaction ability and reduce the deformation associated with liquefaction-induced settlement.

关 键 词：盾构隧道 饱和砂土 液化势 沉降 加固处理 

分 类 号：TU435[建筑科学—岩土工程]