深埋大断面公路隧道松散荷载计算方法研究

发布时间：2019-01-21 21:34

【摘要】：通过数值模拟与理论分析手段,开展深埋大断面公路隧道松散荷载计算方法研究。采用应变软化模型分析深埋大断面公路隧道分步施工中塌落拱的发展规律,结果表明:分步开挖大断面隧道可有效控制塌落拱的扩展,隧道塌落拱是各导坑开挖逐步积累的结果,传统荷载计算方法可用于开挖过程中各导坑松散荷载的计算,但不适用于大断面隧道最终成型时的松散荷载计算。因此,以状态设计法为基础,动态设计为手段,充分体现临时支护的作用,提出深埋大断面公路隧道分步施工松散荷载计算公式,并进行应用;通过与马林隧道的实测数据对比,表明该方法应用于深埋大断面公路隧道松散荷载计算时具有较高的准确度。研究成果可以为确定该类隧道支护参数提供设计依据。
[Abstract]:By means of numerical simulation and theoretical analysis, the calculation method of loose load of deep buried highway tunnel with large section is studied. The strain softening model is used to analyze the development rule of collapse arch in step construction of deep buried large section highway tunnel. The results show that the expansion of collapse arch can be effectively controlled by step excavation of large section tunnel. Tunnel collapse arch is the result of gradual accumulation in excavation of each pilot pit. The traditional load calculation method can be used to calculate the loose load of each tunnel during excavation, but it is not suitable for the loose load calculation of large section tunnel when it is finally formed. Therefore, based on the state design method and dynamic design method, the function of temporary support is fully reflected, and the calculation formula of loose load in step construction of deep buried large section highway tunnel is put forward and applied. By comparing with the measured data of Ma Lin tunnel, it is shown that this method has a high accuracy in the calculation of loose load of deep buried highway tunnel with large section. The research results can provide the design basis for determining the supporting parameters of this kind of tunnel.
【作者单位】：交通运输部公路科学研究所;
【基金】：国家自然科学基金资助项目(51278233) 贵州省交通运输厅科技项目(2015 122 050)~~
【分类号】：U452

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