软土地区基坑开挖引起的浅基础建筑沉降分析

发布时间：2018-07-21 21:27

【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/He值的增加,土体沉降呈先缓慢增加,后迅速减小的趋势。在x16 m时,土体沉降值较大但差异沉降较小,在10 mx28 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y30 m时,建筑沉降值较小,差异沉降较大;在y30 m时,沿y方向的建筑沉降值较大,差异沉降较小。
[Abstract]:The excavation of foundation pit will cause the additional stress and deformation of the surrounding building. Through the analysis of the monitoring data of the retaining structure of the continuous wall during the excavation of the foundation pit, it is found that the maximum lateral displacement of the wall body increases with the increase of the excavation depth. The maximum displacement depth is near the excavated surface, and the proportion of lateral displacement to the final displacement is 91.8%. With the increase of x / he value, soil settlement increases slowly first, then decreases rapidly. At x16 m, the settlement value of soil is larger but the differential settlement is smaller. At 10 mx28 m, the settlement of soil decreases rapidly, and the differential settlement of soil is larger. When x is 9.6m ~ 27.6m, the proportion of building settlement to final settlement is 76.6m / 71.5cm and 56.8m respectively. The settlement variation of the five-story building is quite different from that of the surface soil. The variation trend of the settlement of the three-story building is close to that of the surface. At y30m, the building settlement value is smaller and the differential settlement is larger, while at y30m, the building settlement value along y direction is larger and the differential settlement is smaller.
【作者单位】：浙江大学滨海与城市岩土工程中心;软弱土与环境土工教育部重点实验室;浙江理工大学建筑工程学院;中国建筑第五工程局;
【分类号】：TU433

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