摘要
随着城市的快速发展,地下空间的开发和利用使得深基坑工程施工全过程中的变形和稳定性问题越来越突出,以受到工程建设者的高度关注。通过数值模拟分析非对称荷载涉水深基坑开挖全过程中土体及支护结构变形,分析结果显示:(1)坑外水位变化不大时,随着基坑的开挖,地下连续墙的作用不断发挥,基坑外侧土体变形受基坑开挖影响较小,而基坑内侧土体由于受到开挖卸荷的影响,土体竖向变形量不断减小且有向上隆起的趋势。(2)坑外水位变化不大时,随着基坑的开挖,基坑左、右两侧地下连续墙上的最大位移逐渐增大且均指向基坑内侧,墙的支护作用逐渐发挥,且随着基坑的开挖,地下连续墙逐渐处于悬臂状态,最大位移均处于墙顶。(3)受基坑两侧非对称荷载的影响,同一工况下右侧荷载(大荷载)作用下地下连续墙上最大位移均大于左侧(小荷载)且同一工况及同一深度下右侧荷载(大荷载)作用下地下连续墙上位移均大于左侧(小荷载)。因此,实际工程设计和施工过程中不应忽视基坑两侧非对称荷载带来的支护结构上差异变形的影响。上述分析可对深基坑工程设计和施工提供一些借鉴和参考。
With the rapid development of the city, the development and utilization of underground space make the deformation and stability problems in the whole construction process of deep foundation pit engineering more and more attention of the project builders. In this paper, the deformation of soil and supporting structure in the whole process of deep foundation pit excavation under asymmetric load is analyzed by numerical simulation. The analysis results show that:(1)with the excavation of the foundation pit, the underground diaphragm wall continues to play a role, and the soil deformation outside the foundation pit is less affected by the excavation;Due to the influence of excavation unloading, the vertical deformation of soil inside the foundation pit decreases and tends to rise.(2)With the excavation of the foundation pit, the maximum displacements of the underground continuous wall on the left and right sides of the foundation pit gradually increase and point to the inside of the foundation pit, and the supporting effect of the wall gradually plays a role. And with the excavation of the foundation pit, the underground continuous wall gradually becomes cantilever, and the maximum displacements are all at the top of the wall.(3)Under the influence of asymmetric loads on both sides of the foundation pit, under the same working condition, the maximum displacement of the underground continuous wall under the action of the right load(large load)is greater than that of the left side(small load), and under the same working condition and the same depth, the maximum displacement of the underground continuous wall under the action of the right load(large load) is greater than that of the left side(small load). Therefore, the influence of asymmetrical load on the supporting structure should not be ignored in the actual engineering design and construction. The above analysis can provide some reference for the design and construction of deep foundation pit.
作者
洪星
Hong Xing(Jiangxi Agricultural Investment Information Technology Co.,Ltd.Nanchang 330000,Jiangxi)
出处
《陕西水利》
2022年第8期117-119,共3页
Shaanxi Water Resources
关键词
非对称荷载
涉水深基坑
数值模拟
支护结构变形和稳定性
Asymmetric loads
deep foundation pits wading
numerical simulation
deformation and stability of supporting structures
作者简介
洪星(1989-),男,江西高安人,助理工程师,主要从事水利水电工程相关工作。
