摘要
在开挖深度较大时,组合支护结构得到越来越多的应用,但设计中一般是将各种支护结构单独进行分析,没有考虑共同作用。以某深基坑为例,通过FLAC3D建立有限差分模型,分析了土钉、顶撑以及排桩联合支护下深基坑的稳定性,得到排桩水平位移、土钉轴力、支撑轴力的变化规律。研究结果表明:随着开挖的进行,支护结构受力增大,但土钉变化不大;超载使桩身位移变大,地表沉降增大;过大或过小的排桩嵌固深度不利于受力;土钉的长度应合理设置。
As a new kind of technology in deep foundation excavation,the combined supporting structure is attracting more attentions. However,research of the coupled effect is generally rare. Based on the software FLAC^3D,the coupled effect of a deep foundation excavation with combined supporting structure is analyzed. The supporting structure is composed of soil nail,top supports and row piles. The law of the horizontal displacement of piles,the axial force of soil nail and the bracing axial force is obtained. The results show that force of the structure increases as the excavation depth increase,but the axial force of soil nail is observed little variation. The overload would significantly increase the displacement of pile,the surface subsidence and axial force of soil nail. The embed depth of piles should be arranged reasonably to avoid failure.
出处
《施工技术》
CAS
北大核心
2014年第21期5-9,共5页
Construction Technology
关键词
风洞
支护
有限元分析
土钉
桩
共同作用
wind tunnels
supports
finite element analysis
soil nails
piles
coupled effect
作者简介
杨辉，工程师，E-mail：mshs_163@163．com
