崔福庆;刘志云;陈建兵;彭惠;张伟;王伟;

• 1:长安大学地质工程与测绘学院
• 2: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

摘要(Abstract)：

为分析不同测试方法对青藏工程走廊带内多年冻土导热系数测试结果的影响规律,指导冻土工程的热工设计和为走廊带内冻土导热系数的测试方法选择提供依据,搭建了稳态对比法、稳态热流计法、瞬态平面热源法和瞬态热线法冻(融)土导热系数试验测试平台,运用理论模型对稳态对比法测试过程中径向漏热量进行了估算,分别从测试结果准确性、适用土性类别和适用场合等方面对各类测试方法进行了对比。结果表明:稳态对比法试验结果与文献理论值相差较大,测试过程中径向漏热量无法忽略;稳态热流计法和瞬态平面热源法的测试结果与理论计算值具有较好的一致性,80%以上的测量值与理论值相对误差小于±15%;瞬态热线法测试结果整体偏小,冻、融土平均偏小17.75%和15.03%.考虑到瞬态平面热源法测试结果准确,测试时间短,样品需求量小,因而是一种合适的青藏工程走廊带冻(融)土导热系数大规模测试方法。

关键词(KeyWords)： 多年冻土;导热系数;稳态热流法;瞬态平面热源法;瞬态热线法

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51574037,41502292);; 中国交通建设股份有限公司应用基础研究项目(2018-ZJKJ-PTJS03)

作者(Author): 崔福庆;刘志云;陈建兵;彭惠;张伟;王伟;

Email:

DOI: 10.13800/j.cnki.xakjdxxb.2020.0518

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