深基坑井点降水的优化设计及数值模拟

发布时间：2018-06-22 13:22

本文选题：深基坑 + 基坑降水　；参考：《沈阳建筑大学》2014年硕士论文

【摘要】：随着城市化发展进程的不断加快,地下工程的开发与利用越来越多地受到人们的关注,深基坑、超深基坑工程不断涌现,岩土工程问题日益突出。基坑降水工程作为基坑施工过程中的重要环节,是确保基坑开挖安全顺利的关键,在实际施工中有着举足轻重的地位。在实际工程中,绝大部分基坑降水方案趋于保守,实际水位降深值远远大于设计水位降深值,基坑总涌水量大幅度增加,对周围建筑物产生了一定的影响,同时增加了工程降水费用,因此在保证基坑开挖安全顺利的前提下,对于基坑降水方案进行优化设计是十分必要的。通过优化降低基坑总涌水量,使得实际降深值尽可能接近于设计水位降深值,减小对周围建筑的影响,降低工程降水费用。本文阐述了基坑降水的主要方法,并对基坑降水基本理论以及降水优化设计做了一定的介绍,在此基础上主要开展了以下几个方面的工作：(1)以各个控制点水位降深最大值最小化为目标函数,以单井出水量为设计变量,通过把控制点水位降深大于设计水位降深、单井出水量小于单井最大出水量作为约束条件,同时考虑实际降水井的最大井深和最小井径问题,建立了以单井出水量为变量的数学优化模型；(2)考虑工程降水井布置问题,为了寻求最佳降水井布局,使得水位降深值趋于平稳,本文建立了以井距为设计变量,以控制点水位降深最大值最小化为目标函数的深基坑降水优化数学模型；(3)运用所建数学模型分别对沈阳世贸五里河T3-T5及S3楼深基坑降水工程和另一工程实例进行优化设计,并运用MATLAB软件优化函数对所建模型进行求解,减小了世贸五里河工程的基坑总涌水量,得到了工程实例二的合理井距；(4)采用三维地下水渗流软件Visual Modflow通过对沈阳世贸五里河T3-T5及S3楼深基坑研究区域的水文地质条件进行分析研究,建立了相应的概化条件模型,并分别对上文优化结果与原设计方案进行仿真模拟,得到了良好的仿真效果,对前文建立优化模型进行验证；(5)在所建数值模型的基础上,Visual Modflow软件的井优化模块对沈阳世贸五里河T3-T5及S3楼深基坑研究区域进行降水井单井抽水量的优化,并将优化结果输入模型,重新仿真计算,对比分析结果再次验证了上文建立数学优化模型的可行性。
[Abstract]:With the rapid development of urbanization, people pay more and more attention to the development and utilization of underground engineering. As an important part of foundation pit construction, foundation pit dewatering project is the key to ensure the safe and smooth excavation of foundation pit, and plays an important role in actual construction. In the actual engineering, most of the foundation pit dewatering schemes tend to be conservative, the actual water level drop value is far larger than the design water level drop value, and the total foundation pit water inflow increases substantially, which has a certain impact on the surrounding buildings. At the same time, the dewatering cost of the project is increased, so it is necessary to optimize the design of the foundation pit dewatering scheme under the premise of ensuring the safe and smooth excavation of the foundation pit. By optimizing the total discharge of foundation pit, the actual depth reduction value is as close as possible to the design water level drop value, the influence on the surrounding buildings is reduced, and the project dewatering cost is reduced. In this paper, the main methods of foundation pit dewatering are described, and the basic theory of foundation pit dewatering and the optimum design of foundation pit dewatering are introduced. On this basis, the following aspects of the work are mainly carried out: (1) taking the maximum value of water level drop at each control point as the objective function, taking the water output of a single well as the design variable, the depth of the water level of the control point is greater than the depth of the design water level. The single well output is less than the single well maximum output as the constraint condition, and the maximum well depth and minimum well diameter of the actual precipitation well are taken into account, and a mathematical optimization model with single well water output as variable is established. (2) considering the layout of engineering precipitation well, In order to find the best layout of the dewatering wells and make the water level drop more stable, a mathematical model of deep foundation pit dewatering optimization is established, which takes the well spacing as the design variable and minimizes the maximum depth drop of the control point as the objective function. (3) the mathematical model is used to optimize the dewatering project of T3-T5 and S3 building deep foundation pit of Shenyang Wuli River and another engineering example, and the optimization function of MATLAB software is used to solve the model. The total water inflow of foundation pit of Wuli River project is reduced, and the reasonable well spacing is obtained. (4) based on the analysis of hydrogeological conditions in the study area of T3-T5 and S3 building deep foundation pit of the Wuli River in Shenyang by using the three-dimensional groundwater seepage software Visual Modflow, the corresponding generalized condition model is established. And the above optimization results and the original design were simulated, and good simulation results were obtained, and the optimization model was established to verify the above results. (5) on the basis of the numerical model established, the well optimization module of Visual Modflow software is used to optimize the single well pumping capacity in the research area of deep foundation pit of Shenyang Wuli River T3-T5 and S3 building, and the optimized results are input into the model and re-simulated. The results of comparison and analysis verify the feasibility of the above mathematical optimization model.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU473.2

【相似文献】