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为解决浅埋暗挖隧道穿越富含水地层时易发生涌水、涌泥这一工程难题,以南京地铁二号线上海路站~新街口站区间浅埋暗挖隧道为工程背景,运用大型有限元软件ADINA建立隧道涌水段冻结温度场及冻结加固后隧道开挖力学数值模型,对不同冻结管布置间距及冻土帷幕厚度进行了分析对比,提出了合理而又安全的冻结参数,为工程方案的确定和优化提供了理论依据。通过计算及工程实践表明:在浅埋暗挖隧道内采用垂直人工冻结技术能有效解决含水地层中的涌水及渗漏问题;在进行冻结管布置时间距不宜大于120cm以便保证冻土帷幕的有效性;冻土帷幕厚度控制在1.6m~2.0m是安全合理的。
In order to solve the engineering problem that the shallow buried tunnel digging through water-rich strata prone to water gushing and gushing, taking the shallow buried tunnel of Shanghai Railway Station ~ Xinjiekou Station of Nanjing Metro Line 2 as the engineering background, The finite element software ADINA establishes the freezing temperature field of tunnel gushing water section and the numerical model of tunnel excavation mechanics after freezing and reinforcement. The spacing between different freezing pipes and the thickness of frozen soil curtain are analyzed and compared, and reasonable and safe freezing parameters are proposed. The program provides the theoretical basis for the determination and optimization. Through calculation and engineering practice, it is shown that the vertical artificial freezing technology can effectively solve the problem of water inrush and seepage in the water-bearing stratum in the tunnel with shallow burying; the time interval of freezing pipes should not be more than 120cm in order to ensure the validity of the frozen soil curtain ; Frozen soil curtain thickness control in the 1.6m ~ 2.0m is safe and reasonable.