基坑挡墙变位诱发地表沉陷的模型试验研究

发布时间：2018-04-27 21:54

本文选题：基坑开挖 + 刚性挡墙　；参考：《岩土力学》2015年10期

【摘要】：针对刚性挡墙不同变位模式,对基坑开挖过程中地表沉陷规律进行模型试验研究。开展的模型试验分别模拟了挡墙在平移(T模式)、绕墙趾转动(RB模式)和绕墙顶转动(RT模式)3种基本刚性变位模式下诱发的墙后地表沉陷,得到了土体沉陷曲线的分布规律。结果表明,挡墙平移时,墙后地表沉降呈勺型分布,最大沉降紧靠墙背处;挡墙绕墙趾转动时,墙后地表沉降近似呈三角形分布,最大沉降紧靠墙背处;挡墙绕墙顶转动时,墙后地表沉降近似呈抛物线分布,最大沉降位于距墙背一定距离的位置处。挡墙变位距离相同时,对于绕墙趾和绕墙顶转动模式,墙后土体沉陷的面积基本相等,两者沉陷面积之和近似等于平移模式的土体沉陷面积,另外,挡墙变位面积与墙后土体沉陷面积也近乎一致。将试验观察的沉陷曲线与既有的解析解作了对比分析,验证了二者的一致性。
[Abstract]:According to different displacement modes of rigid retaining wall, the ground subsidence law during excavation of foundation pit is studied by model test. The model tests were carried out to simulate the surface subsidence induced by the three basic rigid displacement modes of the retaining wall under the three basic rigid displacement modes: the translation T mode, the rotating RB model around the toe of the wall) and the RT model around the top of the wall, and the distribution of soil subsidence curves was obtained. The results show that when the retaining wall is moving, the surface settlement behind the wall is a ladle distribution, and the maximum settlement is close to the back of the wall; when the retaining wall rotates around the toe of the wall, the surface settlement behind the wall is approximately triangular, and the maximum settlement is close to the back of the wall, and when the retaining wall rotates around the top of the wall, The surface settlement behind the wall is approximately parabolic, and the maximum settlement is located at a certain distance from the back of the wall. When the displacement distance of the retaining wall is the same, the area of soil subsidence behind the wall is basically equal to that of the soil subsidence area of the translation mode for the rotation mode around the toe of the wall and the top of the wall, and the sum of the two subsidence areas is approximately equal to that of the soil subsidence area of the translation mode. The displacement area of the retaining wall is almost the same as the settlement area of the soil behind the wall. The experimental subsidence curves are compared with the existing analytical solutions, and the consistency between the two is verified.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：杭州市建委科技项目(No.2010391) 国家自然科学基金项目(No.10972159)
【分类号】：TU476.4;TU433

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