With the development of urbanization, the construction conditions of foundation pits are becoming more and more complex, especially group excavation meets complex interaction problems among various projects. Taking the group excavation projects in Guangzhou as an engineering case, the excavation sequences of the foundation pits are simulated using a three-dimensional numerical model based on hardening soil-small strain model, and the results are compared with the measured data to analysis the interaction of group excavation. The results show that the lateral displacement of numerical simulation results are basically consistent with the measured results, indicating that the hardening soil-small strain model is suitable for the numerical analysis of foundation pit projects; with the excavation of adjacent foundation pits, the additional ground settlement and the additional lateral displacement of supporting structure of the existing excavation caused by follow-up foundation pit; for the existing foundation pit, the excavation of the adjacent foundation pit is equivalent to unloading outside the pit, and the supporting structure of the existing foundation pit will appear as lateral deformation in the direction of the follow-up foundation pit. Therefore, it is necessary to consider the interaction in the design of group excavation for the similar projects.
Feng Zhongwen
,
Yang Hongpo
,
Wen Kewei
. Three-dimensional Numerical Simulation on Interaction among the Adjacent Group Excavation[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S1)
: 283
-289
.
DOI: 10.20174/j.JUSE.2024.S1.34
[1] 沈健. 超大规模基坑工程群开挖相互影响的分析与对策[J]. 岩土工程学报, 2012, 34(增1): 272-276.
[2] 邵鹏, 朱春柏, 潘静杰, 等. 基坑群间有限土压力及支护结构相互作用研究[J]. 地下空间与工程学报, 2021, 17(增1): 187-195.
[3] 郭力群, 程玉果, 陈亚军, 等. 内支撑基坑群开挖相互影响的三维数值分析[J]. 华侨大学学报(自然科学版), 2014, 35(6):711-716.
[4] 陈小雨, 袁静, 胡敏云, 等. 相邻深大基坑安全距离理论分析与数值模拟[J]. 地下空间与工程学报, 2019, 15(5): 1557-1564.
[5] 戴斌, 胡耘, 王惠生. 上海地区相邻基坑同步开挖影响分析与实践[J].岩土工程学报, 2021, 43(增2): 129-132.
[6] 杨其润, 李明广, 陈锦剑,等. 同步实施的相邻基坑相互作用机理[J]. 上海交通大学学报, 2022, 56(6): 722-729.
[7] 秦善良, 孙梦尧. 大规模共墙基坑群开挖相互影响规律数值模拟[J]. 工程建设, 2023, 55(4): 1-7.
[8] 王海波, 徐明, 宋二祥. 基于硬化土模型的小应变本构模型研究[J]. 岩土力学, 2011, 32(1): 39-43.
[9] 谢东武, 管飞, 丁文其. 小应变硬化土模型参数的确定与敏感性分析[J]. 地震工程学报, 2017, 39(5): 898-906.
[10] 尹骥. 小应变硬化土模型在上海地区深基坑工程中的应用[J]. 岩土工程学报, 2010, 32(增1): 166-172.
[11] Monika M C. A study of displacements of structures in the vicinity of deep excavation [J]. Archives of Civil and Mechanical Engineering, 2019, 19(2): 547-556.
[12] Xuan F, Xia X H, Wang J H. The application of a small strain model in excavations [J]. Journal of Shanghai Jiaotong University, 2009, 14(4): 418-422.
[13] Mu L L, Huang M S. Small strain based method for predicting three-dimensional soil displacements induced by braced excavation [J]. Tunnelling and Underground Space Technology, 2016, 52(2): 12-22.
[14] 温科伟, 刘树亚, 杨红坡. 基于小应变硬化土模型的基坑开挖对下穿地铁隧道影响的三维数值模拟分析[J]. 工程力学, 2018, 35(增1): 80-87.
[15] 华南理工大学建筑设计研究院勘察工程有限公司.广州腾讯大厦项目岩土工程详细勘察报告[R]. 广州:华南理工大学建筑设计研究院勘察工程有限公司, 2016.
