高海拔季节冻土区高速铁路路基水-热-冻胀变形特征研究——以兰新客专民乐段为例

doi:10.7522/j.issn.1000-0240.2018.0064

摘要/Abstract

摘要： 兰新第二双线是世界上第一条修建在高海拔季节冻土区的高速铁路，路基填料采用通常认为是冻胀非敏感性材料的粗颗粒土（A、B组填料）。基于2015-2017年军马场-民乐区间（长约38 km）运营期现场监测发现，部分路段仍有较大冻胀量发生，对列车高速运营存在安全隐患。现场监测结果表明：该区间高铁路基平均冻结期为5个月，最大冻深介于3.0~3.8 m，约是天然冻深的2倍，路基2.7 m以上地层最大冻胀量可达27.5 mm。0~0.5 m级配碎石层含水量很低，控制在4%以内，暖季较高，寒季由于冻结而降低；0.5 m以下地层含水量相对较高，介于8%~15%之间，暖季较低，寒季较高，呈现“正弦”式分布，且随着路基深度增加而逐渐减小。路基冻胀发展过程大致可分为三个线性阶段，其中第二阶段（12月中下旬至次年1月中旬）为冻胀发展最快时期，历时约20天可达到稳定冻胀量。

关键词: 季节冻土, 高速铁路, 粗颗粒土, 冻胀

Abstract: The Lanzhou-Xinjiang Railway Second Double Line is the first and the longest high-speed railway in the high altitude and seasonal frozen areas in Northwest China. Based on the observation at three monitor sections, wide-spread frost heave had been captured over two freezing periods (2015-2017). The results showed that the heave mainly occurred in the coarse fills that have been ever considered as unsusceptible to frost heave. The frozen period was nearly five months and the maximum frozen depth ranged from 3.0 to 3.8 m, two times of original frozen depth. The maximum frost-heave amount can reach to 27.5 mm between the surface and a depth of 2.7 m. The water content in crushed rock layer (0~0.5 m) is less than 4% in warm reason, and decreases in cold reason. The water content in coarse soil layer (under 0.5 m depth) is relative higher, between 8% and 15%, and the water content in warm reason is lower than that in cold reason, distributing as a sine curve. With the depth increasing, the water content decreases gradually. The development process of frost heave can be divided into three linear phases, and the maximum growth rate of frost-heave amount occurs from the middle or last ten days of December to the middle ten days of January, which means that in about twenty days in all a stable frost-heave amount will be reached.

Key words: seasonal frozen soil, high-speed railway, coarse graded soil, frost heave

中图分类号:

P642.14

邵珠杰. 高海拔季节冻土区高速铁路路基水-热-冻胀变形特征研究——以兰新客专民乐段为例[J]. 冰川冻土, 2018, 40(3): 588-597.

SHAO Zhujie. The characteristics of high-speed railway subgrade's temperature, moisture and frost heave deformation in high altitude and seasonal frozen region:taking the Minle section of Lanzhou-Xinjiang passenger railway line as an example[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2018, 40(3): 588-597.

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