低填方路基施工过程中钢波纹管涵洞受力变形分析
Force Deformation Analysis of Steel Bellows Culvert During the Construction of Low-Fill Roadbed
张彬彬1
作者信息
- 1. 中铁十八局集团第二工程有限公司,河北唐山 063000
- 折叠
摘要
研究低填方路基在动态施工过程中钢波纹管涵洞的受力特点与变形特征对于涵洞设计与现场施工方案的编制具有重要意义.本文以新晋高速公路为例,针对低填方段动态施工过程中的钢波纹管涵洞的内外壁轴向和切向受力特征及变形特性,并结合管顶处土压力随填土高度的分布规律进行研究分析,研究发现:管涵顶部的土压力系数变化反应为土拱生成、破坏、新土拱生成的受力传递效应;侧面填土的拖拽作用而产生附加应力是造成管涵顶部土压力远大于侧面土压力的主要原因;在低填方段中管涵顶部应变最大,而变形主要体现在水平向的压缩和竖直向的拉伸,最终使管涵截面呈现椭圆状变形,因此在实际施工过程中应加大顶部的防护.
Abstract
It is of great significance for culvert design and on-site construction plan to study the stress characteristics and deformation characteristics of steel bellows culvert during the dynamic construction pro-cess of low-fill subgrade.Taking Xinjin Expressway as an example,it is studied and analyzed the axial and tangential stress characteristics and deformation characteristics of the inner and outer walls of steel corru-gated pipe culverts during the dynamic construction of low-fill section and the distribution law of earth pressure at the top of the pipe with the height of the fill soil,and it is found that the change of earth pres-sure coefficient at the top of the pipe culvert reacts to the force transfer effect of soil arch formation,failure and new earth arch generation.The additional stress caused by the dragging effect of the side fill is the main reason why the soil pressure at the top of the pipe culvert is much greater than the soil pressure on the side.In the low-fill section,the strain at the top of the culvert is the largest,and the deformation is mainly reflected in the horizontal compression and vertical stretching,and finally the section of the culvert is elliptical deformation,so the protection of the top should be increased during the actual construction pro-cess.
关键词
低填方/钢波纹管/变形/土压力/动态Key words
low fill/steel bellows/deformation/earth pressure/dynamic引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据