软土地区基坑开挖引起的浅基础建筑沉降分析

刘念武; 龚晓南; 俞峰; 汤恒思

doi:10.11779/CJGE2014S2057

软土地区基坑开挖引起的浅基础建筑沉降分析 English Version

刘念武^{1, 2},
龚晓南^{1, 2},
俞峰³,
汤恒思⁴

1. 浙江大学滨海与城市岩土工程中心,浙江杭州 310058;
2. 软弱土与环境土工教育部重点实验室,浙江杭州 310058;
3. 浙江理工大学建筑工程学院,浙江杭州310018;
4. 中国建筑第五工程局,浙江杭州 310058

详细信息

作者简介:
刘念武(1987- ),男,博士研究生,主要从事桩及基坑方面的研究。E-mail: zjulnw@163.com。

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出版历程
- 收稿日期: 2014-07-27
- 发布日期: 2014-07-27

Settlement of buildings with shallow foundations induced by excavation in soft soils

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
2 Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China;
3. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China;
4. China Construction Fifth Engineering Division Corp. Ltd., Hangzhou 310058, China

摘要

摘要: 基坑开挖会引起周围建（构）筑物的附加应力和变形,通过对基坑开挖过程中连续墙围护结构的监测资料分析发现,随着开挖深度的增加,墙身最大侧向位移呈增大的趋势;最大位移深度位于开挖面附近,底板浇筑时侧向位移所占最终位移的比例为91.8%。随x/H_e值的增加,土体沉降呈先缓慢增加,后迅速减小的趋势。在x<16 m 时,土体沉降值较大但差异沉降较小,在10 m< x <28 m,土体沉降呈迅速减小的趋势,土体的差异沉降值较大。在x分别为9.6,27.6,45.2 m时,底板浇筑时的建筑沉降所占最终沉降的比例分别为76.6%,71.5%,56.8%。五层建筑的沉降变化与地表土体的沉降变化相差较大,2~3层建筑的沉降变化趋势与地表的变化趋势较为接近。在y <30 m时,建筑沉降值较小,差异沉降较大;在y >30 m时,沿y方向的建筑沉降值较大,差异沉降较小。
- 基坑 /
- 建筑沉降 /
- 空间效应 /
- 时间效应 /
- 变形
Abstract: Excavation will cause additional stress and deformations to the surrounding buildings. A series of field monitoring exercise of a deep foundation pit are conducted, including lateral wall deflections, soil settlements and building settlements. Field data indicate that the maximum wall deflections increase as the excavation depth increases, and the maximum wall deflection occurs near the excavation face. The wall deflection is accounted for 91.8% of the final wall displacement when the slab is cast in place. The settlement increases firstly and decreases sharply as the value of x/H_eincreases (x, the distance from the wall in the horizontal direction; H_e,excavation depth). The soil settlement is relatively large, while the differential settlement is small when x<16 m, however, the soil settlement is relatively small, while the differential settlement is large when 10 m< x <28 m. The building settlements at the time the slab is cast in place is accounted for 76.6%, 71.5%, 56.8% of the final building settlements with the value of x being 9.6 m, 27.6 m, 45.2 m, respectively. The settlement profile of the five-storey building varies with x and is different from that of soil settlement. However, the settlement profile of the two or three-storey building varies when x is similar to that of soil settlement. The building settlement is relatively large, while the differential settlement is large when y<30 m (y, the distance from the excavation corner in the longitudinal direction), however, the building settlements are relatively small, while the differential settlement is small when y>30 m.
- excavation /
- building settlement /
- spatial effect /
- time effect /
- deformation

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参考文献(15)

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