[1]汪水银,沙爱民,穆 柯,等.地震作用下高原多年冻土区高填方路基动力响应[J].长安大学学报(自然科学版),2017,37(04):67-75.
　WANG Shui-yin,SHA Ai-min,MU Ke,et al.Dynamic response of high filled embankment under earthquake in plateau permafrost areas[J].Journal of Chang’an University (Natural Science Edition),2017,37(04):67-75.
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地震作用下高原多年冻土区高填方路基动力响应()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第37卷
期数:
2017年04期
页码:
67-75
栏目:
冻土路基专栏
出版日期:
2017-07-14

文章信息/Info

Title:
Dynamic response of high filled embankment under earthquake in plateau permafrost areas
作者:
汪水银; 沙爱民; 穆 柯; 朱东鹏; 金 龙
1. 长安大学 公路学院，陕西 西安 710064；2. 中交第一公路勘察设计研究院有限公司，陕西 西安 710068
Author(s):
WANG Shui-yin;  SHA Ai-min;  MU Ke;  ZHU Dong-peng;  JIN Long
1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. CCCC First Highway Consultants Co., Ltd., Xi’an 710068, Shaanxi, China
关键词:
道路工程; 多年冻土; 有限元法; 地震; 高填方路基; 动力响应
Keywords:
road engineering;  permafrost;  FEM;  earthquake;  high filled embankment;  dynamic response
分类号:
U416
文献标志码:
A
摘要:
针对青藏高原多年冻土区路基在地震作用下出现大量破坏这一实际问题，以G214公路工程地质条件为基础，以西宁台站、大武台站、都兰台站等实测地震加速度数据作为边界条件，建立有限元模型，计算地震荷载下多年冻土区路基动力学响应。计算了-0.2 ℃、-0.5 ℃、-0.8 ℃年平均地温工况下路基动力响应，并以此为基础研究温度对路基动力响应影响；以1、4、7、10月温度场计算结果为依托，计算了不同季节工况对路基动力响应影响；以5、10、15 m高填路基为样本，通过动力分析，确定填方高度对路基动力响应影响；同时考虑阴阳坡效应对路基稳定性影响，对比分析阴阳坡侧动力响应差异，并对比分析各因素对路基动力稳定性影响权重，确定其中主要因素。研究结果表明：地震荷载作用下，填土高度对路基稳定性的影响大于季节及温度的影响；受路基阴阳坡效应的影响，阳坡侧路基位移峰值大于阴坡侧，路肩处阳坡侧水平位移峰值比阴坡侧高42.9%，阳坡侧坡脚水平位移比阴坡侧高42.8%；10月份为路基体受力及变形最不利季节，冻土地温越高，路基顶面及坡脚点位移幅值越大，且地温对坡脚点位移的影响大于路基中心点；在地震作用下，有明显阴阳坡效应的多年冻土路基坡脚位移差别较大，路基阳坡侧较阴坡侧有更高的失稳风险。
Abstract:
Aiming at the problem that embankment in permafrost regions of Qinghai-Tibet Plateau was severely damaged under earthquake action, dynamic response model was established based on engineering geological conditions of G214 Highway, and the measured earthquake acceleration data of Xining station, Dawu station, Dulan station were collected as boundary conditions. The dynamic response of embankment under average annual ground temperature of -0.2 ℃, -0.5 ℃ and -0.8 ℃ were calculated. Based on this, the influence of temperature on embankment dynamic response was studied. Based on the temperature field calculation results of January, April, July and, October, influence of different seasons on dynamic response of embankment was calculated. 5, 10 and 15 m filled embankment were taken as samples, the dynamic response of embankment is analyzed with dynamic response. At the same time, considering the effect of cold and hot slope on embankment stability, the dynamic response differences between cold and hot slopes were compared. The influence weights of various factors on the dynamic stability of embankment were compared and analyzed, and the main factors were determined. The results show that the influence of filling height on stability of embankment is greater than that of season and temperature conditions. Peak value of hot slope side displacement is greater than that of cold side because of cold and hot slope effect. Horizontal displacement at road shoulder in hot side is 42.9%, which is larger than that of cold shoulder, and horizontal displacement at slope toe in hot side is 42.8%, which is larger than that of cold side. October is the most unfavorable season for strength and deformation of road base. The higher temperature in permafrost, the larger the peak value of displacement of subgrade top and slope toe, and the effect in slope is remarkable than the center point. Cold and hot slope embankment has obviously difference displacement in hot and cold slope under action of earthquake, and the hot slope side has higher instability risk than cold side.

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更新日期/Last Update: 2017-07-17