典型冻土路基变形调控措施应用效能分析  

Analysis on Applied Efficiency of Deformation Control Measures for Typical Permafrost Subgrade

作　　者：樊凯[1] 俞祁浩 李金平[1] 朱东鹏[1] FAN Kai YU Qi-hao LI Jin-ping ZHU Dong-peng(State Key Laboratory of Road Engineering Safety and Health in Cold and High-Ahitude Regions, CCCC First Highway Consultants Co. , Ltd. , Xi＇an Shaanxi 710064, China Northwest Institute of Eco-Environment and Resources, CAS, Lanzhou Gansu 730000, China)

机构地区：[1]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,陕西西安710064 [2]中国科学院西北生态环境资源研究院,甘肃兰州730000

出　　处：《公路交通科技》2017年第10期34-41,共8页Journal of Highway and Transportation Research and Development

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)

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。In order to solve the deformation control and stability problems of subgrade in permafrost regions,and satisfy the need of the selection for subgrade regulation measures in high altitude permafrost regions,taking some typical subgrade regulation measures which has been applied in Qinghai-Tibet highway,of Gonghe-Yushu highway,and CAS Beiluhe higher-grade test road as the research object,the reflective condition of the long time series monitoring data is compared with the result of numerical simulation,and long-term effectiveness of the typical regulation measures is verified by investigation of the road operating status to discuss the adaptability of them in higher-grade highway. The result shows that（ 1） The long-term effectiveness of the permafrost subgrade deformation regulation measures based on adjust and control temperatures did not meet the design expectation,such as thermal insulation engineering measures,heat pipe engineering measures,hollow block revetment engineering measures,etc. They adjusted and controlled thepermafrost subgrade deformation mainly by reducing the heat absorption of subgrade base and regulating the change trend and strength of subgrade base temperature field. They have high demand for strurcture safety and stability of subgrade structure itself. The measures should not be used alone in controlling the deformation of subgrade,and should be combined with other measures.（ 2） The comprehensive efficiency of the measures controlling both of water and heat,such as the block-stone engineering measures,ventilation pipe engineering measures,full face ventilation engineering measures,etc.,is proved to be positive by a longterm observation and can basically meet the design expectation. The effect of reducing the influence of water and temperature of these measures is obvious by reducing the influence of water,increasing the cold reserves of base by heat convection,although there are some measures lack in heat efficiency,and have the problem of net heat absorption overall at bottom of the

关 键 词：道路工程 效能分析 数值模拟 路基变形 典型调控措施 多年冻土 

分 类 号：U416.168[交通运输工程—道路与铁道工程]