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滑坡区域既有隧道桩索联合加固体系模型试验研究
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Physical Model Test Analyses on Combined Anti-slide Pile and Anchor Cable Reinforcement System of Existing Tunnel in Landslide Scope
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    摘要:

    目前,国内外学者针对隧道开挖引起的滑坡体变形影响研究较多,而针对山体滑坡作用下运营隧道结构的受力变形及加固措施研究较少.基于此,提出隧道垂直穿越滑坡工况下既有隧道桩索联合加固体系,即将抗滑桩、锚索及隧道衬砌联成一体,这与传统的隧道加固与滑坡体治理分开研究有很大不同,然而由于其理论研究远滞后于工程实践,限制了在工程实践中的推广应用.为研究山体滑坡区域既有隧道桩索联合加固措施下的力学作用机制,建立了既有隧道走向与滑坡体垂直时3种工况下的地质力学模型试验,分别在无加固、抗滑桩加固及桩索联合加固措施下针对滑坡体与隧道结构的相互作用规律进行分析.试验结果发现,采取加固措施后,测试数据发生明显变化,特别是在桩索联合加固体系中,即隧道、抗滑桩、锚索形成新的结构体系具有更高的承载能力和稳定性,能进一步提高既有隧道的运营安全.该成果可为山区隧道穿越滑坡体的后期加固提供一定的理论依据.

    Abstract:

    At present, most scholars at home and abroad usually focus on the stress and deformation of landslide body caused by tunnel excavation. There are few studies on the force, deformation and reinforcement of existing tunnel structures under the influence of landslide. Based on the issue, a new combined reinforcement system of pile and cable in existing tunnel is proposed,where the anti-slide piles, anchor cables and tunnel lining are integrated, which is very different from the traditional study by the separated type between tunnel reinforcement and landslide treatment. However, due to its theoretical research lags far behind engineering practice, it limits the application in engineering practice. In order to study the stress and deformation of the reinforcement measures of the existing tunnel in landslide scope, three geo-mechanical model tests in case of vertical crossing direction are established to study the interaction rules between the landslide and the tunnel structure. It includes the ones without reinforcements,with anti-slide pile reinforcements and with combined anti-slide pile and anchor cable reinforcements. It is found that the test data change significantly after the reinforcement measures are applied. Especially in the combined anti-slide pile and anchor cable reinforcement system, the tunnels, the anti-slide piles and the anchor cables form a new structural system with higher carrying capacity and stability, which can ensure the operational safety of the existing tunnel. The results can provide a theoretical basis for the service reinforcements of the tunnel in the landslide mountain scope.

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张治国?覮,马兵兵,张成平,赵其华.滑坡区域既有隧道桩索联合加固体系模型试验研究[J].湖南大学学报:自然科学版,2018,45(S0):92~97

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  • 在线发布日期: 2018-12-11
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