高速铁路路涵过渡段路基冻结特征试验研究

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摘要对典型涵洞的路涵过渡段路基土体的冻结特征展开监测，并分析路涵过渡段路基及其下地基土的冻结特征和时空变化过程及其对路基稳定性的影响。结果表明，涵洞的存在使得台后路基冻结深度约为天然场地最大冻结深度的2倍，同时涵顶和涵底的冻结时刻和融解时刻均较涵侧要早；涵洞间接充当了通风管道的作用，减弱了路基的阴阳坡效应差异；涵洞的存在对其周围路堤的温度场有明显的影响，其显著增大了涵顶、涵侧填料温度随气温变化的幅度。通过对路涵过渡段土体冻结特征的监测分析，为涵下地基处理和路涵过渡段的路基填料选择及铺设方式提供参考。

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关键词 ：土力学, 季节冻土, 高速铁路, 路涵过渡段, 冻结特征, 热稳定性

Abstract：Based on monitoring of ground temperature in a typical roadbed-culvert transition section，the ground temperature regime and its temporal and spatial development，along with its impact on roadbed stability was analyzed. The results show that，the maximum depth of seasonal freezing in the roadbed of transaction is about 2 times which in the natural ground because of the existence of culvert. The starting times of freezing and thawing process above and below the culvert are earlier than that behind the culvert wall. As the culvert performs somewhat as a ventilation duct，the temperature difference caused by the sunny-shady slopes is weaken. The culvert has a significant impact on the ground temperature of the roadbed around it，showing as significant increase of temperature changing amplitude in the fillings above the culvert and behind the culvert wall. Above all，the works of monitoring and analysis of the freezing characteristics in roadbed-culvert transition section can provide references for the selection of roadbed filling material and foundation treatment below the culvert.

Key words： soil mechanics seasonal frozen ground high-speed railway roadbed-culvert transition section freeze characteristics thermal stability

收稿日期: 2013-05-06

引用本文:

牛富俊1，2，刘华1，3，牛永红1. 高速铁路路涵过渡段路基冻结特征试验研究[J]. 岩石力学与工程学报, 2014, 33(3): 639-646.
NIU Fujun1，2，LIU Hua1，3，NIU Yonghong1. EXPERIMENTAL STUDY OF FREEZE CHARACTERISTICS IN ROADBED- CULVERT TRANSITION SECTION ALONG A HIGH-SPEED RAILWAY. , 2014, 33(3): 639-646.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/I3/639

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