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出 处:《岩石力学与工程学报》2017年第A01期3423-3430,共8页Chinese Journal of Rock Mechanics and Engineering
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)~~
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。Research on calculating method for loose load of deep-buried large cross-section road tunnel has been done through numerical simulation and theoretical analysis method. Evolution rule of Slumping arch in deep-buried large cross-section road tunnel excavation by steps is analyzed by numerical method with the strain-softening model. The result indicates that excavations of large cross-section tunnel by steps can effectively control the slumping arch expansion, slumping arch of tunnel is the accumulation of that of headings, and traditional method can be used for calculating the loose load of heading in the process of the excavation, but not for that of large cross-section tunnel. So, the calculating method for loose load of deep-buried large cross-section tunnel in the process of excavation by steps is introduced and put into use. It is based on the state design method, carried out with the means of dynamic design, and fully embodies the role of temporary support. By compared with the measured data of Malin tunnel, it indicates that high accuracy can be reached with the method applied to calculate the loose load of deep-buried large cross-section road tunnel. These research results can provide design basis for supporting parameters determination of the similar tunnel.
分 类 号:U45[建筑科学—桥梁与隧道工程]
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