基于演化分析的多年冻土区路基补强后力学稳定性评价研究

doi:10.13722/j.cnki.jrme.2021.0630

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摘要在高温、高含冰量多年冻土区，普通路基受多年冻土退化的影响而产生显著的沉降变形，需要对它们增设块石护坡、热棒等冷却措施进行补强以提升路基的热、力学稳定性。为评价不同类型措施的补强效果以及路基补强后的力学稳定性，基于青藏铁路多年冻土区沿线6个经过补强的监测断面，通过分析历史变形数据评价块石护坡–热棒复合措施及单一块石护坡措施的补强效果，然后利用Verhulst模型和指数曲线法演化分析其中3个变形较大的断面的沉降过程，以评价其长期力学稳定性。结果显示：普通路基在增设块石护坡–热棒复合措施或单一块石护坡措施之后，变形速率会有效减缓，而复合措施补强效率更快，效果更显著。在存在含土冰层的多年冻土区，采用复合措施进行补强可以显著提升路基的力学稳定性，而单一块石护坡措施可以一定程度上减缓路基变形速率，但对路基长期力学稳定性的提升能力相对较弱。此外，在路基左右两侧铺设不同厚度的块石护坡层可以缓解阴阳坡效应。研究旨在加深对多年冻土区路基补强措施强化效果的认识，为路基的维护与补强提供科学依据。

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	章赛泽1
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	牛富俊1
	王志伟3
	王进昌3
	董添春3

关键词 ：土力学, 多年冻土区, 青藏铁路, 补强措施, 沉降演化, 力学稳定性

Abstract：In warm and ice-rich permafrost regions，the settlement deformation of the traditional embankments is obvious owing to permafrost degradation. Therefore，cooling methods，such as crushed-rock revetments and thermosyphons，should be implemented in the embankments to improve the thermal and mechanical stability of the embankments. To evaluate the reinforcing effects of different types of reinforcement measures and the mechanical stability of the reinforced embankments，based on six monitoring sections along the Qinghai—Tibet Railway in permafrost regions，the reinforcing effects of combined crushed-rock revetment and thermosyphon measure and single crushed-rock revetment measure are evaluated by analyzing historical deformation data. Then，the settlement process of three sections with large deformation is evolved by using the Verhulst model and the exponential curve method in order to evaluate the mechanical stability of three sections. The results show that the deformation rate of a traditional embankment will be effectively slowed down after reinforced while that the reinforcement efficiency of the combined measure is faster than the single crushed-rock revetment. In the permafrost regions with massive ground ice，the mechanical stability of the embankments can be significantly improved by using combined measures. A single reinforcement measure may only slow down the deformation rate of the embankments to a certain extent，but can not effectively improve their long-term mechanical stability. In addition，the uneven settlement of the embankments can be effectively adjusted by using crushed-rock revetment with different thicknesses on both sides of the embankments. This study aims to deepen the understanding of the effect of embankment reinforcement measures and to provide a scientific basis for embankment reinforcement in the permafrost regions.

Key words： soil mechanics permafrost regions Qinghai—Tibet railway reinforcement measures settlement evolution mechanical stability

引用本文:

章赛泽1，2，牛富俊1，王志伟3，王进昌3，董添春3. 基于演化分析的多年冻土区路基补强后力学稳定性评价研究[J]. 岩石力学与工程学报, 2022, 41(6): 1285-1295.
ZHANG Saize1，2，NIU Fujun1，WANG Zhiwei3，WANG Jinchang3，DONG Tianchun3. Mechanical stability assessment of reinforced embankments in permafrost regions using evolution analysis. , 2022, 41(6): 1285-1295.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0630 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I6/1285

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