Influence of Adjacent Asymmetric Foundation Pit Excavation on the Existing Building and the Optimized Analysis
-
摘要: 以长沙市区某既有浅基础建筑物近邻非对称基坑工程为依托，通过有限差分法数值程序建立了考虑结构–基础–地基共同作用的数值模型。通过数值模拟方法，分析了建筑物两侧非对称基坑采用不同开挖方案对地层变形和既有建筑变形及受力的影响。数值分析结果表明，既有浅基础建筑物的存在，会影响基坑开挖引起坑外地表沉降曲线的形态。近邻既有建筑的非对称基坑开挖顺序也对地层变形及建筑结构受力有重要影响。综合考虑施工条件、基坑开挖对地层及建筑物变形影响等因素的情况下，应优先施工既有建筑远侧的基坑，后施工近侧基坑。Abstract: Based on the asymmetric excavation project adjacent to an existing shallow foundation building in Changsha, the proposed study used the finite difference numerical program to establish numerical models that considers the interaction between the structural foundation and the ground. Through the numerical simulation method, the influence of different excavation schemes on the ground deformation, the deformation and force of existing buildings has been analyzed. Numerical analysis results show that the existence of shallow foundation building affects the settlement curve of the ground surface caused by excavations. The asymmetric excavation sequence has an important influence on ground deformation and structural forces of adjacent existing buildings. Taking into account the construction conditions and the impact of excavations on the deformation of the ground and buildings, priority should be given to the excavation of the foundation pit on the far side of the existing building, and then the foundation pit excavation on the near side.
-
Key words:
- existing building /
- foundation pit /
- asymmetric excavation /
- construction impact /
- numerical simulation
-
表 2 土体本构模型及基本力学参数
地层土体 厚度 /m 重度γ/(kN·m−3) 弹性模量E/MPa 泊松比ν 黏聚力c/kPa 内摩擦角φ/(°) 填土 1.5 18 4.2 0.3 14 9 砂砾层 12 19 25 0.3 3 35 全风化板岩 2 20 35 0.3 38 19 强风化板岩 10 22 100 0.3 60 21 中等风化板岩 15 24 200 0.25 100 30 
下载: 导出CSV
-
[1] 耿晔宽,高芬芬,周成君. 深厚软土地区基坑大变形机理与控制对策研究[J]. 岩土工程技术,2018,32(6):313-316. doi: 10.3969/j.issn.1007-2993.2018.06.009 [2] 韩健勇,赵 文,关永平,等. 近接浅基础建筑物深基坑变形特性及关键参数[J]. 东北大学学报(自然科学版),2018,39(10):1463-1468. doi: 10.12068/j.issn.1005-3026.2018.10.019 [3] 张治国, 杨 轩, 赵其华, 等. 浅基础框架建筑受邻近基坑开挖影响简化分析[J]. 岩土工程学报, 2017, 39(S2): 224-227. [4] 郭延辉,王建国,高才坤. 昆明软土地区深基坑开挖对邻近地铁隧道稳定性的影响[J]. 岩土工程技术,2018,32(5):254-260. [5] 陈锦剑,王建华,杜 毅,等. 两侧深基坑开挖影响下浅埋运营隧道的位移特性[J]. 地下空间与工程学报,2011,7(6):1163-1167. [6] 伍尚勇,杨小平,刘庭金. 双侧深基坑施工对紧邻地铁隧道变形影响的分析[J]. 岩石力学与工程学报,2012,31(S1):3452-3458. [7] 高 波,李方明,朱利明,等. 地铁车站深基坑邻近浅基础房屋保护措施研究[J]. 现代隧道技术,2018,55(6):117-123. [8] 吕文龙. 珠江三角洲地区基坑开挖对邻近建筑地基基础的影响及控制[J]. 建筑科学,2018,34(1):122-129. [9] 刘念武,龚晓南,俞 峰,等. 软土地区基坑开挖引起的浅基础建筑沉降分析[J]. 岩土工程学报,2014,36(S2):325-329. [10] 信磊磊,杜一鸣,郑 刚. 两侧深基坑开挖对近邻地铁车站及隧道变形影响的优化分析[J]. 铁道标准设计,2016,60(5):84-90. [11] 梅 祯, 肖军华, 王炳龙. 基坑开挖对临近基坑地铁高架结构变形的影响[J]. 土木与环境工程学报(中英文), 2019, 41(4): 51-58. [12] 徐中华,王卫东. 敏感环境下基坑数值分析中土体本构模型的选择[J]. 岩土力学,2010,31(1):258-264. doi: 10.3969/j.issn.1000-7598.2010.01.044 [13] OU C Y,HSIEH P G. A simplified method for predicting ground settlement profiles induced by excavation in soft clay[J]. Computers & Geotechnics,2011,38(8):987-997. [14] SCHUSTER M,KUNG T C,JUANG C H,et al. Simplified model for evaluating damage potential of buildings adjacent to a braced excavation[J]. Journal of Geotechnical & Geoenvironmental Engineering,2015,135(12):1823-1835. [15] GB 50007—2011 建筑地基基础设计规范[S]. 北京: 中国建筑工业出版社, 2012. -
图(8) / 表(2)
计量
- 文章访问数: 164
- HTML全文浏览量: 57
- PDF下载量: 65
- 被引次数: 0
