青藏工程走廊工程容量分析与易建性区划评价  

Capacity Analysis and Constructability Regionalization Evaluation of the Qinghai-Tibet Corridor

作　　者：王佐[1] 张会建[1] 彭惠[1] 于晖[1,2] WANG Zuo;ZHANG Hui-jian;PENG Hui;YU Hui(State Key Laboratory of Road Engineering Safety and Health in Cold and High-altitude Areas,CCCC First Highway Consultants Co.Ltd.,Xi'an 710075,China;Xi'an China Highway Geotechnical Engineering Co.Ltd.,Xi'an 710075,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,西安市710075 [2]西安中交公路岩土工程有限责任公司,西安市710075

出　　处：《公路》2023年第7期304-312,共9页Highway

基　　金：国家自然科学基金面上项目,项目编号42271490,41971095;中国交建科技研发项目,项目编号2020-ZJKJ-PTJS04,2020-ZJKJ-QNCX09;2020-ZJKJ-PTJS12;新疆交通建设集团股份公司科技研发项目“G580和田至康西瓦公路项目关键技术研究与应用”。

摘　　要：为研究青藏工程走廊密集构筑物群下的工程环境效应与青藏高速公路布局,通过对走廊带内冻土工程地质条件、退化趋势、次生地质灾害和工程病害的分析,采用数值模拟、模糊数学和空间区划等方式,建立了基于已建工程影响、冻土工程地质、冻土环境保护的三级工程容量评价体系,划分了工程建设难易程度标准,得到以下结论:工程下伏多年冻土的年平均增温率和活动层增厚率分别为0.187℃/a和15.5 cm/a,是天然状态的20倍和3.2倍;预测未来50年后,青藏工程走廊多年冻土面积退化将达到13%~22%,由此将诱发沉陷、裂缝、波浪等不同形式的工程结构灾变,和热融滑塌、热融湖塘等不同程度的次生地质灾害;在三线并行且不产生相互热干扰的情况下,拟建青藏高速公路与青藏公路、青藏铁路的最小热影响安全距离,整体式路基坡脚间距分别不小于60 m和40 m,分离式路基坡脚间距分别不小于50 m和35 m,且分幅坡脚间距不小于50 m;考虑多年冻土年平均地温、含冰量、土质类型、坡度、热融滑塌、热融湖塘等6大类主要评价指标,提出了青藏工程走廊工程容量指数计算方法与工程建设难易程度等级标准,并基于此将青藏工程走廊划分高、中、低、差4个等级的易建区;最后考虑生态环境保护与风沙灾害特点,提出了工程防护建议。研究结果以期为走廊带内重大线形工程的健康运营、病害防治和未来工程建设提供一定的参考。In order to study the engineering environmental effect and the layout of Qinghai-Tibet Expressway under the dense structure group of Qinghai-Tibet Engineering Corridor,the engineering geological conditions,degradation trends,secondary geological hazards and engineering diseases of frozen soil in the corridor are analyzed.By adopting numerical simulation,fuzzy mathematics and spatial division,a three-level project capacity evaluation system based on the impact of existing projects,permafrost engineering geology,and permafrost environmental protection is established,the standard of construction difficulty is categorized.The conclusions are as below:the annual average temperature increase rate and active layer thickening rate of the permafrost underlying the project are 0.187 ℃/a and 15.5 cm/a respectively,which are 20 times and 3.2 times of the natural state;it is predicted that in the next 50 years,the area of permafrost in the Qinghai-Tibet Project Corridor will be degraded by 13% to 22%,which will induce subsidence,cracks,waves and other forms of structural defects,as well as different degrees of secondary geological disasters such as thermal melt slumps,thermal melt lakes and ponds,etc.Under the condition that the three highway routes are parallel and there is no mutual thermal interference,in regard with the minimum thermal impact safety distance between the proposed Qinghai-Tibet Expressway and the Qinghai-Tibet Highway and Qinghai-Tibet Railway,the distance between the integral embankment slope toe is not less than 60 m and 40 m respectively,and the distance between the separated embankment slope toe is not less than 50 m and 35 m respectively,and the spacing between the sub-slope toes is not less than 50 m.Considering the annual average ground temperature of permafrost,ice content,soil type,slope,thermal melt slump,thermal melt lake and pond and other six main evaluation indicators,the calculation method of the engineering capacity index of the Qinghai-Tibet Project Corridor and the construction difficult

关 键 词：青藏工程走廊 多年冻土 工程容量指数 易建性 模糊数学 

分 类 号：U419.92[交通运输工程—道路与铁道工程] U412.13