基于目标函数法和有限单元法的深基坑井群降水优化分析

发布时间：2018-05-15 22:14

本文选题：井群降水 + 优化设计　；参考：《东北大学》2013年博士论文

【摘要】：1896年在建造伯林地下铁道时第一次使用深井降水。目前,管井井群降水成为解决深基坑施工降水的重要措施。工程降水的难点表现在不确定因素多,降水设计是个动态调整的过程。降水方案设计重点考虑方案的合理性、有效性、环境效应和经济性等因素。因此,工程降水设计需要兼顾上述因素实现方案的优化设计。针对上述问题,本文基于目标函数法和单纯形法,建立了工程降水优化模型,实现了保证施工安全水位前提下总排水量最小的目标,采用EXCEL软件的“规划求解”模块实现了快速、灵活调整降水方案,可实现总排水量最小的目标,同时获得单井排水量数据,对方案约束状态进行评价。该方法具有灵活、快速的特征,利于在工程建设中应用。分析了管井井群降水总排水量和水位降深的影响因素。采用正交试验设计,得到在总排水量最小的前提下,对水位降深影响的主次顺序为渗透系数单井排水量含水层厚度降水井布置,获得降水设计的优组合原则。基于Darcy定律、Biot固结理论和有限单元法,采用COMSOL Multiphysics软件的弱解形式,建立了真三维全耦合渗流模型,进行地下水渗流和土体沉降的非线性分析,在降水渗流分析中首次实现了对单井排水量的赋值,实现了对降水区域渗流场变化的精细描述。针对具体实例,采用目标函数法进行降水方案优化,同时建立数值模型,采用有限单元法分析工程降水的时空变化规律,对降水方案的有效性进行预测。与传统设计方法比较,每个降水区段总排水量节约6%～8%,实现降水目标。模拟结果与实测结果比较,拟合良好。采用上述两种方法相结合可以有效地实现施工降水优化,是降水优化设计的有效方法。
[Abstract]:In 1896, deep well precipitation was first used in the construction of Berlin underground railway. At present, the precipitation of well well group has become an important measure to solve the precipitation in deep foundation pit construction. The difficulty of the engineering precipitation is manifested in many uncertain factors, the precipitation design is a dynamic adjustment process. The heavy point of precipitation scheme is considered to be reasonable, effective and environmental effect. Therefore, the engineering precipitation design needs to take account of the above factors to achieve the optimal design of the scheme. Based on the above problems, this paper establishes the engineering precipitation optimization model based on the objective function method and simplex method, and realizes the goal of the minimum total drainage under the premise of ensuring the safe water level of the construction, and uses the "planning and computing" of the EXCEL software. The module realizes the rapid and flexible adjustment of the precipitation scheme, which can achieve the goal of the minimum total drainage. At the same time, the single well drainage data is obtained, and the constraint state of the scheme is evaluated. This method has flexible and rapid characteristics and is beneficial to the application of the engineering construction. The influence factors of the total drainage amount and the water level drop depth of the well well group are analyzed. Based on the Darcy law, the Biot consolidation theory and the finite single element method, the weak solution of the COMSOL Multiphysics software, based on the Darcy law, the Biot consolidation theory and the finite single element method, is obtained by the orthogonal design. The true three-dimensional full coupling seepage model is established, and the nonlinear analysis of groundwater seepage and soil settlement is carried out. In the analysis of the precipitation seepage, the first realization of the value of the drainage of the single well has been realized for the first time, and the detailed description of the change of the seepage field in the precipitation region is realized. The value model is used to analyze the temporal and spatial variation of Engineering precipitation by the finite element method, and to predict the effectiveness of the precipitation scheme. Compared with the traditional design method, the total drainage of each precipitation section is saved by 6% to 8% to realize the precipitation target. The simulation results are well compared with the measured results. The combination of the above two methods can be effectively combined. The optimization of construction precipitation is an effective way to optimize precipitation design.

【学位授予单位】：东北大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU753.66

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