高效抗冲防淤型自渗回灌井室内试验研究
发布时间：2019-03-05 13:20
【摘要】：自渗回灌井是我国胶东半岛地下水回灌工程中最为重要的组成部分,它一般由回灌井和回灌池组成。现有自渗回灌井存在着回灌效率低、易冲刷和淤堵等问题,严重影响了回灌工程的回灌效果和使用寿命。本文对现有自渗回灌井进行了结构改进和优化,设计了三种新型内外进水式自渗回灌井,给出了新型回灌井单井回灌量的理论计算公式,研制出一套自渗回灌井室内回灌试验装置,进行了内外进水式自渗回灌井室内稳定流回灌试验,得出了新型回灌井的单井回灌量,并进行了讨论。主要研究成果如下:(1)对现有的自渗回灌井进行调研,剖析自渗回灌井的回灌过程,分析影响自渗回灌井回灌量的各种因素,以及影响自渗回灌井回灌的关键因素。现有的自渗回灌井存在的主要问题是回灌效率低、易淤堵、易被水冲刷、使用寿命低、耗用建筑材料多、后期维护成本较高等。(2)设计出三种新型高效抗冲防淤型自渗回灌井,包括台形内外进水式自渗回灌井、方形内外进水式自渗回灌井、圆形内外进水式自渗回灌井。内外进水式自渗回灌井主要是指将回灌池更改为内外进水式,即将回灌池掏空,使水流能从顶面、外侧面、内侧面和底面进入回灌井内。内外进水式自渗回灌井增加了硬质侧壁结构且顶面做成倾向水流的斜坡,具有较好的抗冲防淤能力。(3)建立自渗回灌井入渗过程的井流模型,提出新型自渗回灌井的渗流控制方程,给出高效抗冲防淤型自渗回灌井回灌量的理论计算公式。(4)设计了自渗回灌井室内试验装置,进行了新型自渗回灌井室内稳定流试验,试验得出回灌水的入渗流态、回灌量以及回灌效率。与现有自渗回灌井相比,在回灌池横截面面积相同的条件下,新型自渗回灌井的回灌量约为现有自渗回灌井回灌量的2.6倍,大大提高了自渗回灌井的回灌效率。(5)利用室内试验数据,验证了内外进水式自渗回灌井回灌量的理论计算公式,对内外进水式自渗回灌井的综合折减系数进行推算,推算出内外进水式自渗回灌井的综合折减系数为0.93~0.96,而现有自渗回灌井的综合折减系数为0.6,说明新设计的内外进水式自渗回灌井在回灌过程中产生的井损要小于现有的自渗回灌井。本文研究成果为地下水回灌中回灌井的选择提供了多种新型高效自渗回灌井,为新型内外进水自渗回灌井单井回灌量的确定提供了理论计算依据,试验所得出的内外进水自渗回灌井单井回灌量、综合折减系数可供实际工程参考使用。研究成果对于我国北方地区轻微污染区域和沿海地区海水入侵进行地下水人工回灌、提高雨洪资源利用有效利用率具有重要的现实意义。不足之处,对于新设计的内外进水式自渗回灌井,尚未进行实际井的现场回灌试验。
[Abstract]:Self-permeable recharge well is the most important part of groundwater recharge project in Jiaodong Peninsula of China. It is generally composed of reirrigation well and irrigation pool. At present, there are some problems such as low efficiency of recharge, easy scour and blockage, which seriously affect the effect and service life of the reflow project. This paper improves and optimizes the structure of the existing self-permeable well, designs three new types of self-permeable well with internal and external intake, and gives the theoretical calculation formula of the single-well recharge in the new type of recharge well. In this paper, a set of indoor recharge test device for self-permeable well is developed, and the indoor steady-flow recharge test is carried out. The single-well recharge amount of the new type of recirculation well is obtained, and the discussion is carried out. The main results are as follows: (1) the main research results are as follows: (1) to investigate the existing self-permeable irrigation wells, analyze the recharge process of the self-permeable recirculation wells, analyze the various factors that affect the recharge amount of the self-permeable recirculation wells, and the key factors that affect the recharge of the self-permeable recirculation wells. The main problems existing in the existing self-permeable backfilling wells are low efficiency of recharge, easy siltation and clogging, easy to be washed by water, low service life and much consumption of building materials. The later maintenance cost is higher. (2) three new types of high-efficiency anti-erosion and siltation-resistant self-seepage irrigation wells are designed, including the table-shaped internal and external inflow self-seepage irrigation wells, the square internal and external inlet self-seepage irrigation wells, and the circular internal and external inflow type self-seepage irrigation wells. The internal and external inflow type self-permeable irrigation well mainly refers to changing the irrigation pond to the internal and external inflow type, which is about to be emptied, so that the water flow can enter into the well from the top, the outer side, the inner side and the bottom surface. The internal and external inflow self-permeable well increases the hard sidewall structure and the top surface is made into a inclined flow slope, which has better anti-scour and siltation resistance ability. (3) establish the well flow model of the infiltration process of the self-permeable backfilling well, and build up the well flow model of the infiltration process of the self-permeable backfilling well. This paper puts forward the seepage control equation of a new type of self-permeable recirculation well, and gives the theoretical calculation formula of the recharge amount of the high-efficiency anti-erosion and siltation type self-permeable backfilling well. (4) the laboratory test device of the self-permeable backfilling well is designed. The indoor steady flow test of a new type of self-permeable irrigation well was carried out. The infiltration flow pattern, the amount of recharge and the efficiency of reinjection were obtained in the experiment. Compared with the existing self-permeable well, under the condition of the same cross-section area of the irrigation pool, the recharge amount of the new self-permeable well is about 2.6 times that of the existing self-permeable irrigation well, and the recharge amount of the new self-permeable well is about 2.6 times that of the existing self-permeable well. (5) based on the laboratory test data, the theoretical formula for calculating the recharge amount of the internal and external self-permeable recirculation wells is verified, and the comprehensive reduction coefficient of the internal and external self-permeable recirculation wells is calculated, and the experimental data are used to improve the recharge efficiency of the self-permeable well. It is calculated that the comprehensive reduction coefficient of the internal and external self-permeable filling well is 0.93 ~ 0.96, while the comprehensive reduction coefficient of the existing self-permeable backfilling well is 0.6, The results show that the loss caused by the new design in the process of recharge is less than that in the existing self-permeable well. The research results in this paper provide a variety of new and efficient self-permeable wells for the selection of reirrigation wells in groundwater recharge, and provide the theoretical calculation basis for the determination of single-well recharge in the new type of internal and external inflow self-permeable recirculation wells. The experimental results show that the single well recharge can be used as a reference for the practical engineering. The comprehensive reduction coefficient can be used as a reference for practical engineering. The results of this study are of great practical significance for the artificial recharge of groundwater for seawater intrusion in northern China and coastal areas to improve the effective utilization rate of rain and flood resources. For the newly designed self-permeable well with internal and external intake, the in-situ recharge test of the actual well has not been carried out.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P641.25
[Abstract]:Self-permeable recharge well is the most important part of groundwater recharge project in Jiaodong Peninsula of China. It is generally composed of reirrigation well and irrigation pool. At present, there are some problems such as low efficiency of recharge, easy scour and blockage, which seriously affect the effect and service life of the reflow project. This paper improves and optimizes the structure of the existing self-permeable well, designs three new types of self-permeable well with internal and external intake, and gives the theoretical calculation formula of the single-well recharge in the new type of recharge well. In this paper, a set of indoor recharge test device for self-permeable well is developed, and the indoor steady-flow recharge test is carried out. The single-well recharge amount of the new type of recirculation well is obtained, and the discussion is carried out. The main results are as follows: (1) the main research results are as follows: (1) to investigate the existing self-permeable irrigation wells, analyze the recharge process of the self-permeable recirculation wells, analyze the various factors that affect the recharge amount of the self-permeable recirculation wells, and the key factors that affect the recharge of the self-permeable recirculation wells. The main problems existing in the existing self-permeable backfilling wells are low efficiency of recharge, easy siltation and clogging, easy to be washed by water, low service life and much consumption of building materials. The later maintenance cost is higher. (2) three new types of high-efficiency anti-erosion and siltation-resistant self-seepage irrigation wells are designed, including the table-shaped internal and external inflow self-seepage irrigation wells, the square internal and external inlet self-seepage irrigation wells, and the circular internal and external inflow type self-seepage irrigation wells. The internal and external inflow type self-permeable irrigation well mainly refers to changing the irrigation pond to the internal and external inflow type, which is about to be emptied, so that the water flow can enter into the well from the top, the outer side, the inner side and the bottom surface. The internal and external inflow self-permeable well increases the hard sidewall structure and the top surface is made into a inclined flow slope, which has better anti-scour and siltation resistance ability. (3) establish the well flow model of the infiltration process of the self-permeable backfilling well, and build up the well flow model of the infiltration process of the self-permeable backfilling well. This paper puts forward the seepage control equation of a new type of self-permeable recirculation well, and gives the theoretical calculation formula of the recharge amount of the high-efficiency anti-erosion and siltation type self-permeable backfilling well. (4) the laboratory test device of the self-permeable backfilling well is designed. The indoor steady flow test of a new type of self-permeable irrigation well was carried out. The infiltration flow pattern, the amount of recharge and the efficiency of reinjection were obtained in the experiment. Compared with the existing self-permeable well, under the condition of the same cross-section area of the irrigation pool, the recharge amount of the new self-permeable well is about 2.6 times that of the existing self-permeable irrigation well, and the recharge amount of the new self-permeable well is about 2.6 times that of the existing self-permeable well. (5) based on the laboratory test data, the theoretical formula for calculating the recharge amount of the internal and external self-permeable recirculation wells is verified, and the comprehensive reduction coefficient of the internal and external self-permeable recirculation wells is calculated, and the experimental data are used to improve the recharge efficiency of the self-permeable well. It is calculated that the comprehensive reduction coefficient of the internal and external self-permeable filling well is 0.93 ~ 0.96, while the comprehensive reduction coefficient of the existing self-permeable backfilling well is 0.6, The results show that the loss caused by the new design in the process of recharge is less than that in the existing self-permeable well. The research results in this paper provide a variety of new and efficient self-permeable wells for the selection of reirrigation wells in groundwater recharge, and provide the theoretical calculation basis for the determination of single-well recharge in the new type of internal and external inflow self-permeable recirculation wells. The experimental results show that the single well recharge can be used as a reference for the practical engineering. The comprehensive reduction coefficient can be used as a reference for practical engineering. The results of this study are of great practical significance for the artificial recharge of groundwater for seawater intrusion in northern China and coastal areas to improve the effective utilization rate of rain and flood resources. For the newly designed self-permeable well with internal and external intake, the in-situ recharge test of the actual well has not been carried out.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P641.25
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