摘要
为了分析路堤填筑过程中下伏溶洞顶板稳定性,基于尖点突变理论建立稳定性判定的数学模型;以湖南省益娄(益阳—娄底)高速公路岩溶路段地质条件为研究背景,基于上述稳定性判定模型,设计不同厚度的溶洞顶板填筑时的工况,采用FLAC3D软件模拟分析每层路堤填筑时的顶板稳定性变化规律。研究结果表明:随着路堤填筑高度增加,顶板会逐渐发生失稳变形,顶板厚度与路堤极限填筑高度之间呈二次函数关系;当路堤填筑高度超过极限填筑高度时,上部黏土层与顶板的沉降等值线连通,沉降值最大区域从黏土层移动至顶板中部,塑性区向上延伸发展至地表贯通,对路堤建设产生危害。
In order to analyze the stability of karst carve roof in the process of embankment filling, a mathematical model for stability determination based on the cusp catastrophe theory was established. Based on the geological conditions of the construction section in Yi—Lou highway of Hunan Province and the above stability determination model, the working conditions of the karst cave roof with different thicknesses were designed, and the FLAC3D software was used to analyze the stability of the roof when the embankment was filled. The results show that the roof gradually exhibits instability deformation with the increase of embankment filling height, and the relationship between the height of roof thickness and the ultimate filling height of the embankment is the quadratic function. When the embankment height exceeds the limit filling height, the displacement contours of the upper clay layer is connected with the roof, the largest area of the vertical displacement moves from the clay layer to the middle part of the roof, and the plastic zone extends up to the surface and perforating, which is harmful to the construction of the embankment.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第7期2456-2462,共7页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51508042)
湖南省交通运输厅科技进步与创新计划项目(201417)
长沙理工大学特殊环境道路工程湖南省重点实验室开放基金资助项目(kfj140501)
湖南省教育厅科学研究重点项目(14A007)~~
关键词
尖点突变理论
溶洞
路堤填筑
顶板稳定性
极限填筑高度
the cusp catastrophe theory
karst cave
embankment filling
roof stability
the ultimate filling height
