期刊论文

Response analysis of subgrade deformation in evolution of concealed soil cave

Zeng, X.

中文

中南大学学报(自然科学版)

1672-7207

2018

49

12

3068-3076

10.11817/j.issn.1672-7207.2018.12.021

51508042:国家自然科学基金 51678073:国家自然科学基金 51838001:国家自然科学基金 201417:湖南省交通厅科技进步与创新项目

本校为第一机构

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FLAC~(3D)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...

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 w...