基坑降水开挖对邻近建筑物沉降的影响分析
发布时间：2018-10-15 19:00
【摘要】：随着城市化进程的加快，在原有建筑群中的新建工程日益增多。在建筑物密集且地下水位较浅的地区进行深基坑开挖，必须考虑基坑降水、开挖过程对邻近建筑物的影响。降水可为基坑的开挖提供良好的施工环境，对周围土体加固、支护结构的稳定和水压力减小有很大的作用。同时降水也会使基坑渗流场变得复杂，可能会引起流土、流砂、管涌等灾害，还会使基坑外侧地下水位下降而导致土层固结引发地面沉降。因此必须重视基坑开挖和降水对基坑和邻近建筑物的影响。本文结合邯郸市某基坑工程事故，针对基坑降水开挖引起邻近教学楼过量沉降问题，做了以下工作： (1)研究地下水在土体中的运移规律，地下水对支护结构、土体固结沉降的作用，水-土之间的相互作用，，结合基坑工程实例确定基坑降水产生的降落漏斗的范围大小。 (2)分析基坑降水引起邻近土体的固结沉降规律。探讨太沙基一维固结理论、比奥固结理论在计算土层固结沉降时的差异性，及对于总应力在固结过程中是否变化所产生的影响，总结固结沉降产生的机理和影响因素，得出实例工程降水对基坑邻近区域地面沉降的影响规律。 (3)结合实例基坑工程3-3单元的施工资料，对地下水位和周边变形监测数据进行统计分析；结合理论计算和软件计算，从中发现基坑开挖、降水所引起的教学楼的沉降规律，探讨开挖和降水引起土层沉降的时间和空间效应。分析得出建筑物过量沉降的原因。 (4)应用FLAC3D数值模拟软件，建立基坑工程的数值模型。利用数值模型，研究基坑开挖、基坑降水分别引起的建筑物的变形值及同时考虑开挖和降水引起的变形值与实际监测变形值之间的关系。对比结果表明，同时考虑开挖和降水引起的变形值能较好地与实测值拟合，且不等于分别考虑二者时所引起的变形值之和。所以在基坑设计计算中，应同时考虑基坑降水与开挖对周边环境的影响。 本文的研究结果可为同类型基坑工程的设计与施工提供一定的参考。
[Abstract]:With the acceleration of urbanization, the number of new projects in the original buildings is increasing day by day. When deep foundation pit is excavated in areas with dense buildings and shallow groundwater level, the dewatering of foundation pit and the influence of excavation process on adjacent buildings must be considered. The dewatering can provide a good construction environment for the excavation of foundation pit, and play an important role in strengthening the surrounding soil, stabilizing the supporting structure and reducing the water pressure. At the same time, the precipitation will make the seepage field of foundation pit become complex, which may cause the disasters such as flowing soil, quicksand, piping, etc. It will also reduce the underground water level outside the foundation pit and lead to the consolidation of soil layer and cause the ground subsidence. Therefore, we must pay attention to the influence of excavation and dewatering on the foundation pit and adjacent buildings. Based on a foundation pit engineering accident in Handan city, the following work has been done in this paper: (1) to study the law of groundwater movement in soil, and the underground water to support structure, in view of the problem of excessive settlement caused by dewatering and excavation of foundation pit. The effect of soil consolidation and settlement, the interaction between water and soil, and the examples of foundation pit engineering are used to determine the range of drop funnel produced by foundation pit dewatering. (2) the consolidation settlement law of adjacent soil caused by foundation pit dewatering is analyzed. In this paper, the difference between the consolidation theory and the Biot consolidation theory in calculating the consolidation settlement of soil is discussed, and the influence on whether the total stress changes in the consolidation process is discussed, and the mechanism and influencing factors of the consolidation settlement are summarized. The influence of case engineering dewatering on ground subsidence in adjacent area of foundation pit is obtained. (3) based on the construction data of unit 3-3 of foundation pit engineering, the monitoring data of groundwater level and surrounding deformation are statistically analyzed. Combined with theoretical calculation and software calculation, the settlement law of teaching building caused by excavation and dewatering of foundation pit is found, and the time and space effects of soil subsidence caused by excavation and dewatering are discussed. The causes of excessive settlement of buildings are analyzed. (4) the numerical model of foundation pit engineering is established by using FLAC3D numerical simulation software. Based on the numerical model, the deformation values of buildings caused by excavation and foundation pit dewatering are studied, and the relationship between the deformation values caused by excavation and dewatering and the actual monitoring deformation values is considered. The comparison results show that the deformation values caused by excavation and precipitation can be fitted well with the measured values and are not equal to the sum of the deformation values caused by the two factors. Therefore, the influence of dewatering and excavation on the surrounding environment should be taken into account in the design and calculation of foundation pit. The results of this paper can provide a certain reference for the design and construction of the same type of foundation pit engineering.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU463;TU433
本文编号：2273518
[Abstract]:With the acceleration of urbanization, the number of new projects in the original buildings is increasing day by day. When deep foundation pit is excavated in areas with dense buildings and shallow groundwater level, the dewatering of foundation pit and the influence of excavation process on adjacent buildings must be considered. The dewatering can provide a good construction environment for the excavation of foundation pit, and play an important role in strengthening the surrounding soil, stabilizing the supporting structure and reducing the water pressure. At the same time, the precipitation will make the seepage field of foundation pit become complex, which may cause the disasters such as flowing soil, quicksand, piping, etc. It will also reduce the underground water level outside the foundation pit and lead to the consolidation of soil layer and cause the ground subsidence. Therefore, we must pay attention to the influence of excavation and dewatering on the foundation pit and adjacent buildings. Based on a foundation pit engineering accident in Handan city, the following work has been done in this paper: (1) to study the law of groundwater movement in soil, and the underground water to support structure, in view of the problem of excessive settlement caused by dewatering and excavation of foundation pit. The effect of soil consolidation and settlement, the interaction between water and soil, and the examples of foundation pit engineering are used to determine the range of drop funnel produced by foundation pit dewatering. (2) the consolidation settlement law of adjacent soil caused by foundation pit dewatering is analyzed. In this paper, the difference between the consolidation theory and the Biot consolidation theory in calculating the consolidation settlement of soil is discussed, and the influence on whether the total stress changes in the consolidation process is discussed, and the mechanism and influencing factors of the consolidation settlement are summarized. The influence of case engineering dewatering on ground subsidence in adjacent area of foundation pit is obtained. (3) based on the construction data of unit 3-3 of foundation pit engineering, the monitoring data of groundwater level and surrounding deformation are statistically analyzed. Combined with theoretical calculation and software calculation, the settlement law of teaching building caused by excavation and dewatering of foundation pit is found, and the time and space effects of soil subsidence caused by excavation and dewatering are discussed. The causes of excessive settlement of buildings are analyzed. (4) the numerical model of foundation pit engineering is established by using FLAC3D numerical simulation software. Based on the numerical model, the deformation values of buildings caused by excavation and foundation pit dewatering are studied, and the relationship between the deformation values caused by excavation and dewatering and the actual monitoring deformation values is considered. The comparison results show that the deformation values caused by excavation and precipitation can be fitted well with the measured values and are not equal to the sum of the deformation values caused by the two factors. Therefore, the influence of dewatering and excavation on the surrounding environment should be taken into account in the design and calculation of foundation pit. The results of this paper can provide a certain reference for the design and construction of the same type of foundation pit engineering.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU463;TU433
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