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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。
By means of numerical simulation and theoretical analysis, this paper studies the calculation method of loose load of deep large section highway tunnel. The strain softening model is used to analyze the development of slump arch in the deep-buried large section highway tunnel. The results show that the large-section tunnel excavation can effectively control the expansion of the slump arch. After digging up the accumulated results, the traditional load calculation method can be used to calculate the loose load of each guide pit during excavation, but it is not suitable for the calculation of loose load during the final forming of large-section tunnels. Therefore, based on the state design method, dynamic design as a means to fully reflect the role of temporary support, put forward a formula for calculating the loose load of step-by-step construction of deep-buried large section highway tunnel, and apply it; compared with the measured data of Malin Tunnel , Which shows that this method has a higher accuracy when applied to the calculation of loose load of the deep large section highway tunnel. The research results can provide the design basis for determining the supporting parameters of this kind of tunnel.