砂土垫层对管廊穿越活动地裂缝响应的影响分析

徐强; 白超宇; 李文阳; 陈浩然; 安鹏; 李良成

doi:10.13204/j.gyjzG21022405

砂土垫层对管廊穿越活动地裂缝响应的影响分析

doi: 10.13204/j.gyjzG21022405

徐强^1,2,
白超宇¹,
李文阳^1, ,,
陈浩然¹,
安鹏¹,
李良成³

1. 长安大学地质工程与测绘学院, 西安 710054;
2. 自然资源部地裂缝与地面沉降野外科学观测研究站, 西安 710054;
3. 机械工业勘察设计研究院有限公司, 西安 710043

基金项目:

西部绿色建筑国家重点实验室开放基金项目(LSKF202213)

国家自然科学基金项目(42041006,41807243,41877250,41790441)

中央高校基本科研业务费资助项目(300102269101,300102268206,300102260402)。

详细信息

作者简介:
徐强,男,1986年出生,博士后,讲师。

通讯作者:
李文阳,男,1981年出生,博士,讲师,wyl@chd.edu.cn。

计量
- 文章访问数: 78
- HTML全文浏览量: 8
- PDF下载量: 3
- 被引次数: 0
出版历程
- 收稿日期: 2021-02-24

Analysis on Influence of Sand Replacement on Responses of Utility Tunnels Through Active Ground Fissures

1. College of Geological Engineering and Geomatics, Chang’an University, Xi’an 710054, China;
2. Field Scientific Observation and Research Station of Ground Fissures and Land Subsidence, Xi’an 710054, China;
3. China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., Xi’an 710043, China

摘要

摘要: 在地裂缝广泛分布的城区,城市地下综合管廊建设不可避免会遭受地裂缝活动的影响。基于已有矩形隧道物理模型试验结果,分析地裂缝活动对其破坏作用和过程,并建立其数值模型,对比试验结果验证数值模型的有效性。通过建立地下综合管廊穿越地裂缝的三维有限元模型,设置了50,100,150,200 mm四种不同的沉降量工况以及将换填砂土的长度、高度和角度作为变量的不同工况,进行数值模拟计算。计算结果表明:随着换填砂土的长度、厚度和角度在一定范围内逐渐增大,管廊的最大纵向应力均出现减小的趋势,但超出一定界限后,换填效果减弱,最优的换填砂土长度、厚度和角度分别为6,3 m和60°;砂土换填比未换填管廊的最大纵向应力有明显减小,减小幅度约20%。
- 地下综合管廊 /
- 地裂缝 /
- 砂土换填 /
- 纵向应力 /
- 防治措施
Abstract: The construction of underground utility tunnels will inevitably be affected by ground fracture activities in urban areas where ground fissures are widely distributed. Based on existing physical model test results of rectangular tunnels, the damage effect and process caused by ground fracture were analyzed, and the numerical model was constructed. The validity of the numerical model was verified by comparing the test results and numerical simulation results. By constructing a three-dimensional finite element model of underground utility tunnels crossing ground fissures, four kinds of settlement cases of 50 mm, 100 mm, 150 mm and 200 mm were setted, and the length, height and angle of sand cushions were taken as variables. Numerical simulations were parformed and the results showed that the maximum longitudinal stress of utility tunnels had a decreasing trend with the gradual increase of the length, thickness and angle of the sand cushions within a certain range. Beyond a certain limit, the trend would abate. The optimal length, thickness and angle of sand cushions were 6 m, 3 m and 60° respectively. The maximum longitudinal stress in underground utility tunnels with sand replacement was significantly reduced by about 20% compared with that of underground utility tunnels which were untreated.
- underground utility tunnel /
- ground fracture /
- sand replacement /
- longitudinal stress /
- prevention

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