| 南京江北新区相邻深浅基坑开挖时序优化研究 |
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| 引用本文： | 陶 勇,吕所章,杨 平,张 婷,王晓觅.南京江北新区相邻深浅基坑开挖时序优化研究[J].建筑科学与工程学报,2021,0(6):108-118. |
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| 作者姓名： | 陶 勇 吕所章 杨 平 张 婷 王晓觅 |
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| 作者单位： | (1. 南京林业大学 土木工程学院,江苏 南京 210037; 2. 江苏建科工程咨询有限公司,江苏 南京 210008) |
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| 摘 要： | 依托南京江北新区江漫滩地层地下空间基坑群工程,对深度、面积差别较大的两相邻基坑进行开挖数值模拟研究,提出3种不同开挖时序,对比了不同开挖时序下围护结构变形、地表沉降、坑底隆起规律。结果表明:不同开挖时序控制下基坑外墙与共墙变形作用不同,深浅交替时序控制作用最大,先深后浅次之,先浅后深最小; 在开挖深坑下部土方时,先浅后深时序下,共墙最大变形位置在浅坑底部附近,而另外2种开挖时序下共墙最大变形位置上移到墙顶; 在减小坑外地表沉降方面,深浅交替时序作用最大,先深后浅次之,先浅后深最小; 先浅后深时序施工深坑上部土方时,最大沉降位置逐渐靠近坑壁,而先深后浅时序施工浅坑时最大沉降位置远离坑壁,深浅交替时序施工时,最大沉降位置亦远离坑壁; 在深坑下部土方未开挖时,深浅交替时序对控制浅坑坑底隆起作用最大; 深坑与浅坑均开挖完时,先浅后深时序最有利于控制深坑坑底隆起; 对比各时序基坑变形规律,建议采用深浅交替时序开挖此类相邻基坑。
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| 关 键 词： | 相邻基坑 变形规律 时序优化 数值模拟 |
Study on Excavation Time Sequence Optimization of Adjacent Deep and Shallow Foundation Pits in Jiangbei New District of Nanjing |
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| TAO Yong,LYU Suo-zhang,YANG Ping,ZHANG Ting,WANG Xiao-mi.Study on Excavation Time Sequence Optimization of Adjacent Deep and Shallow Foundation Pits in Jiangbei New District of Nanjing[J].Journal of Architecture and Civil Engineering,2021,0(6):108-118. |
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| Authors: | TAO Yong LYU Suo-zhang YANG Ping ZHANG Ting WANG Xiao-mi |
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| Affiliation: | (1. College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China; 2. Jiangsu Jianke Engineering Consulting Co., Ltd., Nanjing 210008, Jiangsu, China) |
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| Abstract: | Based on the underground space foundation pit group project in Jiangbei New District of Nanjing, the numerical simulation study on the excavation of two adjacent foundation pits with large differences in depth and area was conducted, and three different excavation time sequences were proposed. The laws of retaining structure deformation, surface settlement and pit bottom uplift under different excavation time sequences were compared. The results show that the deformation of the outer wall of the foundation pit and the common wall are different under different time sequences. The depth and shallow alternate time sequence has the greatest control effect, followed by depth first and then shallow, and shallow first and then deep is the least. When excavating the lower part of the deep pit, the position of the maximum deformation of the common wall is near the bottom of the shallow pit under the time sequence of first shallow and then deep, while the position moves up to the top of the wall under the other two time sequences. In terms of surface subsidence outside the pit, the alternating sequence of depth and shallow has the greatest control effect, followed by depth first and then shallow, and shallow first and then deep is the least. During the construction of the upper part of the deep pit under the sequence of shallow first and then deep, the maximum settlement position is gradually close to the wall of the pit, and when the shallow pit is constructed under the sequence of deep first and then shallow, the position is far away from the wall. When the deep and shallow pits are constructed alternately, the position is also far away from the pit wall. When the soil under the deep pit is not excavated, the alternating depth and shallow sequence plays the most important role in controlling the bottom uplift of the shallow pit. When both the deep pit and the shallow pit are excavated, the time sequence of first shallow and then deep is most conducive to controlling the uplift of the deep pit bottom. Comparing the deformation laws of foundation pits in various time sequences, it is recommended to excavate such adjacent foundation pits in alternate depth and shallow time sequences. |
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| Keywords: | adjacent foundation pit deformation law time sequence optimization numerical simulation |
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