地下水诱发地面沉降数值模拟分析研究

发布时间：2018-05-18 07:15

本文选题：地下水开采 + 地面沉降　；参考：《山东大学》2017年硕士论文

【摘要】：近年来由于经济发展以及国内人口数量的增长,开采地下水资源从而导致的大范围沉降现象已经成为一个不可回避的岩土工程问题。本文以德州市德城区为计算背景,以理论分析及数值研究相结合的方法,以探究地下水开采过程中不同含水层失水压缩特性为目标,综合考虑地下水动力学理论以及水文地质学、地下水动力学和岩土力学等,对研究区域内不同时期开采地下水量进行数值模拟,并且对影响地面沉降的参数进行基于蒙特卡罗方法的随机性研究及参数的敏感性分析,研究深层地下水开采引发的地面沉降问题,为德州市德城区沉降现象的治理提出解决方案,减少沉降现象引起的经济损失。本文研究主要内容如下:1.研究分析地质参数随机性基于研究区域德城区的概况研究,引入蒙特卡洛随机理论及敏感性分析理论,对影响地面沉降的重要影响参数进行分析研究,并且进行重要影响参数的敏感性分析,得出不同参数对地面沉降的影响程度并将参数进行敏感性排序,对抽取相同地下水资源而降低沉降量具有重要意义。2.对区域地下水流场规律进行分析研究确切的把握研究区域的流场动态变化是进行地下水开采诱发地面沉降的重要基础工作,在充分了解德城区地质概况及水文地质概况的基础上,概化得出德州市德城区研究区域的水文地质模型,确定地下水系统的补给、径流、排泄等条件,得出不同时期研究区域地下水流场分布规律为地面沉降计算奠定了基础。3.建立研究区域三维流固耦合沉降数值模型依照主要开采地下水层位含水层的水力特征,基于有限元理论建立三维流固耦合沉降数值模型,模拟地下水开采过程中含水层的流量和水头变化,进而得出开采地下水量导致的沉降量。基于德州市德城区深层地下水开采模型,对不同含水层进行特性分析,在进行地下水开采的分析中,对沉降数据进行整理分析,逐层分析含水层失水压缩特性,进而得出含水层的变化特征。根据地面沉降的模拟结果以及对地面沉降重要影响因素的分析,对研究区域的地下水开采情况提出合理的意见与建议。
[Abstract]:In recent years, because of the economic development and the increase of the domestic population, the phenomenon of large-scale settlement caused by the exploitation of groundwater resources has become an unavoidable geotechnical engineering problem. In this paper, based on the background of Decheng District of Dezhou City and the method of theoretical analysis and numerical study, the purpose of this paper is to explore the characteristics of water-loss compression of different aquifers in the process of groundwater exploitation. Considering the theory of groundwater dynamics, hydrogeology, groundwater dynamics and geotechnical mechanics, numerical simulation of groundwater exploitation in different periods in the study area is carried out. And the parameters affecting the ground subsidence are studied based on the randomness of Monte Carlo method and the sensitivity analysis of the parameters to study the ground subsidence caused by the exploitation of deep groundwater. In order to reduce the economic loss caused by the settlement phenomenon, a solution is put forward for the settlement phenomenon in Dezhou City. The main contents of this paper are as follows: 1: 1. The research and analysis of the randomness of geological parameters based on the general situation of the study area Decheng District, the introduction of Monte Carlo stochastic theory and sensitivity analysis theory to analyze the important influence parameters affecting the land subsidence. By analyzing the sensitivity of the important parameters, the influence degree of different parameters on the land subsidence is obtained, and the sensitivity ranking of the parameters is obtained, which is of great significance for extracting the same groundwater resources and reducing the subsidence. The analysis and research on the law of regional groundwater flow field exactly grasp that the dynamic change of the flow field in the study area is an important basic work for ground subsidence induced by groundwater exploitation. On the basis of fully understanding the geological and hydrogeological situation of Decheng District, the hydrogeological model of the research area of Decheng District of Dezhou City is obtained, and the recharge, runoff and discharge conditions of groundwater system are determined. It is concluded that the distribution law of groundwater flow field in different periods lays a foundation for the calculation of land subsidence. The numerical model of three-dimensional fluid-solid coupled settlement in the studied area is established according to the hydraulic characteristics of the groundwater aquifer, and the numerical model of three-dimensional fluid-solid coupling settlement is established based on the finite element theory. The flow rate and water head change of aquifer during groundwater exploitation are simulated, and the settlement caused by groundwater exploitation is obtained. Based on the model of deep groundwater exploitation in Decheng District of Dezhou City, the characteristics of different aquifers are analyzed. In the analysis of groundwater exploitation, the settlement data are analyzed, and the characteristics of aquifer water loss and compression are analyzed layer by layer. Furthermore, the characteristics of aquifer variation are obtained. Based on the simulation results of the ground subsidence and the analysis of the important factors affecting the ground subsidence, the reasonable opinions and suggestions on the groundwater exploitation in the study area are put forward.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P641.8;P642.26

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