典型冻土路基变形调控措施应用效能分析

发布时间：2018-01-05 04:05

本文关键词：典型冻土路基变形调控措施应用效能分析　出处：《公路交通科技》2017年10期 　论文类型：期刊论文

【摘要】：为了解决多年冻土区路基变形控制与稳定性问题,满足高海拔多年冻土区路基调控措施的选型需求,以青藏公路、国道214线共和至玉树公路、中科院北麓河高等级试验公路中已试验应用的一些典型路基调控措施为研究对象,采用实测数据分析、数值模拟等方法,将实体试验工程长时间序列监测数据反映的情形与数值模拟结果对照,并结合道路运营状态调查等技术手段对各类典型调控措施的长期作用效能进行验证,探讨其在高等级公路中的适应性。研究表明:隔热层工程措施、热棒工程措施、空心块护坡工程措施等基于温度调控的冻土路基变形调控措施,主要通过减少路基基底吸热、调控路基基底温度场的变化趋势与强度,实现对冻土路基变形进行调控,它们对路基自身结构安全与稳定性要求较高,长期作用效能没有达到设计预期,该类调控措施在路基变形调控应用中不宜单独使用,应注重与其他调控措施组合使用;块石路基、通风管路基、全断面通风路基等主要基于水、热同时调控的工程措施,它们通过减弱水的影响,对流换热增加基底冷储量,减少路基体水热影响作用明显,虽然也存在有些措施热效能不足、路基基底整体处于净吸热状态的问题,但其自身结构力学稳定性和水稳定性较好,综合使用效能经长期观察是积极的,路基变形能基本达到设计预期。
[Abstract]:In order to solve the problem of deformation control and stability of roadbed in permafrost region and to meet the demand of roadbed regulation and control measures in permafrost region at high altitude, the highway from Gonghe to Yushu on Qinghai-Tibet Highway and National Highway 214 is adopted. Some typical roadbed regulation and control measures have been tested and applied in the Beilu River high-grade test highway of the Chinese Academy of Sciences for the research object, using the methods of data analysis and numerical simulation. Compared with the results of numerical simulation, the long-term effectiveness of various typical control measures was verified by means of road operation condition investigation and so on. The study shows that the engineering measures of thermal insulation, hot bar and hollow block slope protection are based on temperature regulation and control measures of frozen soil subgrade deformation. Mainly through reducing the subgrade base heat absorption, adjusting the change trend and intensity of the subgrade base temperature field, realize the control of the frozen subgrade deformation, they have a high demand for the subgrade structure safety and stability. The long-term effect is not up to the design expectation, this kind of control measures should not be used alone in the application of subgrade deformation control, and should be combined with other control measures. Rock subgrade, ventilation subgrade and ventilation roadbed are mainly based on the engineering measures of water and heat control, which increase the cold reserves of the basement by weakening the influence of water. The effect of reducing the influence of water and heat on the road matrix is obvious. Although some measures have insufficient thermal efficiency and the subgrade basement is in the state of net heat absorption, the structural mechanical stability and water stability of the roadbed are better. The comprehensive use efficiency is positive after long-term observation, and the subgrade deformation can basically reach the design expectation.
【作者单位】：中交第一公路勘察设计研究院有限公司高寒高海拔地区道路工程安全与健康国家重点实验室;中国科学院西北生态环境资源研究院;
【基金】：“十二五”国家科技支撑计划项目(2014BAG05B03,2014BAG05B07) 交通运输部科技项目(2013 318 490 010)
【分类号】：U416.168
【正文快照】： 0引言在国家的大力支持下,地处高海拔高寒地区的西藏,公路交通建设取得了举世瞩目的成就,公路网在规模、质量、通达深度和服务水平等方面都有了显著的提高。但是,西藏是我国目前唯一没有通达省际高等级公路的省区,而且西藏与内地的陆路联系主要依靠青藏公路、青藏铁路,以及不

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