考虑基坑开挖空间效应的邻近建筑物沉降预测方法

摘要/Abstract

摘要： 摘要：通过工程监测数据统计，分析了基坑开挖引起的墙后土体变形特性，再结合建筑物变形响应研究提出了一种考虑空间效应的紧邻基坑建筑物沉降简化算法.重点研究了土体变形空间分布规律，发现可以采用高斯函数对墙后土体变形空间效应进行定量描述，结果表明，基坑短边处变形空间效应不明显，长边上拐角处变形明显小于中部变形.坑后土体可划分为3个区域，不同区域空间效应分布不同，而且建筑物短边刚度对土体变形空间分布影响不大.建筑物沉降简化算法以监测数据统计规律为基础，结合变形空间分布规律可以预测邻近基坑建筑物沉降，通过经验系数γ可将土层性质、周边施工情况等纳入考量，使建筑物沉降预测更为准确.算例分析表明，本文方法计算值与实测值有较好的一致性，可为预测、分析紧邻基坑施工的建筑物沉降提供参考.

关键词: 基坑, 建筑物沉降, 简化算法, 空间效应, 经验公式

Abstract: Abstract： The soil deformation induced by excavation behind the retaining wall was analyzed by statistical analysis of the engineering monitoring data and calculation result analysis of the basic model using the finite element method. The spatial distribution of soil deformation was studied in detail, which indicated that Gauss function could be used to describe the spatial distribution of the soil deformation behind the retaining wall quantitatively. A simplified approach for settlement prediction of buildings caused by adjacent excavation was presented combining this study and the study on building deformation response to soil deformation induced by excavation. The study shows that the spatial distribution of soil deformation is not notable in the short side of the excavation and the deformation in the corner of the excavation is much less than that in the middle of the excavation. The stiffness of the buildingshortside has a small impact on the spatial distribution of soil deformation. Based on the statistical analysis of the engineering monitoring data, the simplified approach can be used to predict the building settlement and soil properties taking the construction factor into consideration using empirical coefficient γ. The case analysis shows that the monitoring result and the calculated result obtained by the simplified approach are in good agreement and the simplified approach can be used to predict the building settlement adjacent to the excavation.

Key words: Key words： excavation, settlement of buildings, simplified method, spatial distribution, empirical formula

中图分类号:

TU 43

章红兵，范凡，胡昊. 考虑基坑开挖空间效应的邻近建筑物沉降预测方法[J]. 上海交通大学学报（自然版）, 2016, 50(04): 641-646.

ZHANG Hongbing,FAN Fan,HU Hao. Simplified Method to Predict ExcavationInduced Settlements of Adjacent Buildings Considering Space Effect[J]. Journal of Shanghai Jiaotong University, 2016, 50(04): 641-646.

参考文献

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