新建隧道下穿不同结构形式既有运营隧道变形分析

作者：刘士海¹’²

作者单位：

刘士海,工程师,E-mail:869956346@ qq. com

作者简介：

1. 北京市建设工程质量第三检测所有限责任公司,北京 100037;2. 北京市市政工程研究院,北京 100037

摘要：

结合北京某新建矿山法隧道下穿不同结构形式既有运营隧道工程,基于 Peck 理论修正公式及变形实测数据,采用拟合分析方法进行拟合反演分析,对新建隧道下穿不同结构形式既有运营隧道变形特性进行研究分析.结果表明:新建隧道下穿施工引起的既有隧道结构变形与既有隧道的结构形式有关,竖向位移变化规律为:盾构隧道矿山法单洞隧道>矿山法连拱隧道;新建隧道上台阶穿越施工对既有隧道结构影响较大,单线穿越后呈“单凹槽”,双线穿越后呈“双凹槽”,两次穿越存在叠加影响;Peck 理论修正公式可较好地拟合新建隧道下穿施工引起的不同结构形式既有隧道沉降,既有隧道结构的地层损失率为 0.018% ~ 0.079%,处于天然地层数值范围内的较低水平,沉降槽宽度参数为 0.77~ 1.70,大于天然地层数值;对比不同结构形式既有隧道累积沉降曲线拟合参数可发现穿越施工中既有隧道地层损失率与既有隧道结构刚度成反相关,沉降槽宽度参数与既有隧道结构刚度成正相关.

关键词：隧道工程;结构形式;监测;理论分析;变形

English：

Combined with a new mining tunnel in Beijing underpassing existing operating tunnels withdifferent structural forms, based on the Peck theory correction formula and the measured deformationdata, the fitting analysis method is used to fit the inversion analysis, and the deformation characteristicsof the new tunnel under different structural forms of the existing operating tunnel are studied andanalyzed. The results show that the structural deformation of the existing tunnel caused by theconstruction of the new tunnel is related to the structural form of the existing tunnel, and the variation lawof vertical displacement is shield tunnel > mining method > mine arch tunnel. The upper step of newtunnel has great influences on the existing tunnel, single-line crossing presents a single slot, whiledouble-line crossing presents a double slot, the two crossings have superimposed effects. Peck theorycorrection formula can fit the settlement of existing tunnels with different structural forms caused by theconstruction of new tunnels, the ground loss rate of the existing tunnel structure is 0.018% ~ 0.079%,which is at a lower level in the range of natural stratum values. The width parameter of the settlementtrough is 0.77 ~ 1.70, which is greater than the natural stratum value. By comparing the fittingparameters of the cumulative settlement curve of the existing tunnels with different structural forms, it canbe found that the loss rate of the existing tunnel stratum during the crossing construction is inverselyrelated to the stiffness of the existing tunnel structure, and the width parameter of the settlement trough ispositively related to the stiffness of the existing tunnel structure.

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岩土与地下工程 > 2024年 第53卷 第10期