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首页> 外文期刊>Journal of Coastal Research: An International Forum for the Littoral Sciences >Dynamic Response of Heavy-Haul Railway Tunnels in Fully Weathered Coastal Red Sandstone Strata with Base Rock Reinforcement: A Numerical Study
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Dynamic Response of Heavy-Haul Railway Tunnels in Fully Weathered Coastal Red Sandstone Strata with Base Rock Reinforcement: A Numerical Study

机译：全风化沿海红砂岩地层中荷兰铁路隧道动态响应，基层岩石加固：数值研究

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摘要

Coastal fully weathered red sandstone exhibits poor cementation, and tunnels can easily develop large deformations undercrossing such rock masses under long-term cyclic loading. This article studies dynamic response of the base rock and tunnel lining structures under the dynamic load of heavy-haul train when different base rock reinforcing methods (curtain grouting reinforcement and cement-soil compaction pile reinforcement) are adopted. A tunnel undercrossing fully weathered red sandstone strata is taken as the research object, from which the rock mechanical strength parameters are obtained for a numerical model. The dynamic response of the base rock significantly decreases with the increased depth, and the inverted arch and arch foot are the most unfavorable stress locations, to which more attention should be paid. Base rock reinforcements enhance the integrity of rock mass, and the acceleration and peak stress of the rock base and lining structure significantly reduce when reinforcement is exerted. The effect of curtain grouting proved to be better, which is indicated by the reduction of acceleration and displacement of tunnel lining as well as the low value of peak acceleration and stress of the base rock.
机译：沿海全风化红砂岩的胶结性较差，在长期循环荷载作用下，隧道在穿越此类岩体时很容易产生大变形。本文研究了采用不同基岩加固方法（帷幕灌浆加固和水泥土挤密桩加固）时，重载列车动荷载作用下基岩和隧道衬砌结构的动力响应。以某隧道下穿全风化红砂岩地层为研究对象，通过数值模拟得到岩石力学强度参数。随着深度的增加，基岩的动力响应显著降低，仰拱和拱脚是最不利的应力位置，应予以重视。基岩加筋增强了岩体的完整性，加筋后，基岩和衬砌结构的加速度和峰值应力显著降低。帷幕灌浆效果较好，隧道衬砌加速度和位移减小，基岩峰值加速度和应力较低。

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