摘要
基于ANSYS建立了路基-土体-综合管廊的三维有限元模型,分析了交通荷载作用下管廊节段的受力性能及下卧土体的位移响应,研究了交通荷载差异及管廊刚度对下卧土体纵向变形分布的影响。通过提取不同管节下方土体的动应力状态,结合经验公式与分层总和法,得到了相邻不同管节的沉降预测值,作差得到不均匀沉降量。结果表明:交通荷载竖向附加应力沿深度方向减小,在2.5 m深度内衰减较快;管廊结构影响力的传递,下卧土体位移响应存在沿管廊纵向的空间滞后性;交通荷载作用空间位置对管廊不均匀沉降有较大影响,90°移动方向工况为单一移动方向较不利工况,交叉路面工作情况不均匀沉降更为明显;管廊刚度增大,下卧土体位移响应峰值变小,节段整体沉降及不均匀沉降均有所降低。
A three-dimensional finite element model of subgrade,soil and composite pipe corridor was established based on ANSYS,and the mechanical performance of the pipe corridor segment and the displacement response of the underlying soil under traffic load were analyzed.The influence of traffic load difference and pipe corridor stiffness on the longitudinal deformation distribution of lying soil was studied.By extracting the dynamic stress state of the soil under different pipe joints,combined with the empirical formula and the layering sum method,the predicted settlement values of different adja-cent pipe joints were obtained.The results show that the vertical additional stress of traffic load decreases along the depth direction and decreases faster in the depth of 2.5 m.As the influence of pipe corridor structure is transmitted,the displace-ment response of the underlying soil mass has the spatial lag along the pipe corridor.The spatial position of traffic load has a great influence on the uneven settlement of pipe corridor,and the single moving direction is more unfavorable in the working direction of 9o°,and the uneven settlement is more obvious in the working condition of cross pavement.With the increase of pipe corridor stffness,the displacement response peak of the underlying soil becomes smaller,and the overall settlement and uneven settlement of the section decrease.The research results of this paper can provide reference for the study and settlement control of the uneven settlement of integrated pipe corridor in soft soil area.
作者
雷承志
崔明辉
尹一哲
LEI Cheng-zhi;CUI Ming-hui;YIN Yi-zhe(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)
出处
《武汉理工大学学报》
CAS
2024年第4期63-71,共9页
Journal of Wuhan University of Technology
关键词
综合管廊
交通荷载
沉降预测
不均匀沉降
软土地基
integrated pipegallery
traffic load
settlement prediction
uneven settlement
soft soil foundation
