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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第12期    总第292期    2018年12月

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文章编号:1672-7207(2018)12-3068-09
土洞演化过程中路基变形的响应分析
何忠明1, 2,杨煜2,曾新发3,刘森峙4

(1. 长沙理工大学 特殊环境道路工程湖南省重点实验室,湖南 长沙,410114;
2. 长沙理工大学 交通运输工程学院,湖南 长沙,410114;
3. 湖南城市学院 土木工程学院,湖南 益阳,413000;
4. 长沙理工大学 国际学院,湖南 长沙,410114
)

摘 要: 为了分析隐伏土洞演化对路基变形的影响,基于已有公路路基土洞的塌陷实例调研分析,提出土洞具有“圆柱状塌陷”及“漏斗状塌陷”2种演化模式;分别利用极限平衡理论和普氏平衡拱理论推导2种土洞演化模式的临界塌陷高度,结合FLAC3D软件分析土洞在演化过程中路基的变形及塌陷规律。研究结果表明:圆柱状土洞临界塌陷高度主要由覆盖土层强度、土体重度、土洞断面面积以及车辆附加荷载等因素决定;漏斗状土洞的临界塌陷高度主要由土体内摩擦角、土体坚固系数、初始土洞半径等因素决定;路基在土洞演化过程中经历稳定、基本稳定、临界塌陷及塌陷等过程;在路基土洞完全塌陷之前,路基表面的倾斜变形值超过允许标准值。

 

关键词: 土洞演化;路基变形;塌陷;临界高度;稳定性

Response analysis of subgrade deformation in evolution of concealed soil cave
HE Zhongming1, 2, YANG Yu2, ZENG Xinfa3, LIU Senzhi4

1. Key Laboratory of Special Environment Road Engineering of Hunan Province,
Changsha University of Science & Technology, Changsha 410114, China;
2. School of Traffic and Transportation Engineering,
Changsha University of Science & Technology, Changsha 410114, China;
3. College of Civil Engineering, Hunan City University, Yiyang 413000,China;
4. International College, Changsha University of Science & Technology, Changsha 410114, China

Abstract:In order to analyze the influence of evolution of concealed soil cavity on the deformation of subgrade, two evolutionary models of “cylindrical collapse” and “funnel collapse” upward expansion of soil cave were proposed based on the analysis of the example of existing highway subgrade soil cave. The critical collapse height in the evolutionary models of soil cave was deduced by using the limit equilibrium theory and Platts equilibrium arch theory, respectively. The deformation and collapse law of the soil foundation in the course of evolution was analyzed by using FLAC3D software. The results show the critical collapse height of cylindrical shaped soil cave is mainly determined by the factors such as the strength of the covering soil layer, the soil mass, the section size of the tunnel and the additional load of the vehicle. The critical collapse height of funnel shaped soil cave is mainly determined by the factors such as the friction angle of soil, the coefficient of soil firmness, the radius of initial soil cave, and so on. In the course of the evolution of the soil cave, the subgrade undergoes the process of stability, basic stability, critical collapse and collapse. Before the collapse of the subgrade soil cave, the slope deformation of the subgrade surface will exceed the allowable standard value after stabilization.

 

Key words: soil cave evolution; deformation of subgrade; collapse; critical height; stability

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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