本文關鍵詞： 海綿城市 物理力學參數(shù) 軟土層固結 水平位移 敏感性因素分析　出處：《北京科技大學》2017年博士論文　論文類型：學位論文

【摘要】：海綿城市建設是解決城市開發(fā)中雨水與地表水資源綜合利用、城市排水防洪和生態(tài)環(huán)境保護等問題,實現(xiàn)低影響開發(fā)的重要途徑,對解決城市缺水和內澇等環(huán)境問題,實現(xiàn)城市可持續(xù)發(fā)展,具有重要意義。我國已啟動海綿城市示范工程的建設,在海綿城市建設中,不同區(qū)域的城市,地形地貌、工程地質、水文地質、地表水和氣象條件不同,海綿城市建設的側重點應不同。北京市屬于缺水+內澇型,但以缺水為主的城市,本文以北京市中心區(qū)海綿城市建設為背景,對土層物理力學參數(shù)對地層蓄排水的影響機理開展研究,提出了在盡可能利用自然資源的同時大量改造硬質路面讓雨水能夠滲入到地層中和建設回灌井把雨水導入含水層的海綿城市建設方式,按照利用地層對雨水進行收集和儲存的建設方式,深入分析和揭示了土層物理力學參數(shù)對地層排水和蓄水的影響機理。主要工作及結論如下：(1)通過對北京市中心區(qū)域人口分布及土地價值、氣象條件、地質條件、雨水水質等方面的評價,參考現(xiàn)有雨水利用方式,結合中心區(qū)域的實際情況,提出了北京市中心區(qū)域海綿城市建設方式：在盡可能利用樹木、濕地、河流湖泊的情況下,重點進行人行步道、公園、停車場等地的硬質路面改造讓雨水能夠滲入到地層中和建設回灌井把雨水導入含水層中的海綿城市建設方式,利用天然地層對雨水進行儲蓄,減少了海綿城市配套設施的建設。(2)建立了建筑荷載作用下含水層水位下降引起的軟土層固結解析表達式,根據(jù)固結解析解對相關影響參數(shù)變化下的軟土層固結性狀進行了分析,揭示了相關物理力學參數(shù)對軟土層固結沉降的影響機理,為地層排水的閾值計算提供理論依據(jù)。(3)推導了雨水入滲時地表土層的水平位移速度公式和位移量計算公式；獲得了雨水回灌時含水層骨架顆粒的水平位移速度公式和位移量計算公式,揭示了相關物理力學參數(shù)對土體水平位移的影響機理,為地層蓄水的閾值計算提供理論依據(jù)。(4)基于灰色關聯(lián)分析方法對影響地層排水和蓄水的相關土層參數(shù)進行敏感性因素分析,并對相關影響參數(shù)進行權重排序,確定了硬質路面改造和回灌井建設時需要重點分析的土層物理力學參數(shù)。對灰色關聯(lián)分析法中的分辨系數(shù)提出了新的取值方法,并通過兩個算例驗證該取值方法的合理性及正確性。(5)采用FLAC3D軟件模擬地層排水和蓄水的物理力學發(fā)生過程,通過模擬結果對地層排水和蓄水的發(fā)生過程進行分析和評價,得到了地層在排水和蓄水時的變化規(guī)律,驗證了地層排水和蓄水理論分析和計算結果的正確性。
[Abstract]:Sponge city construction is an important way to solve the problems of Rain Water and surface water resources comprehensive utilization, urban drainage flood control and ecological environment protection in urban development, and to solve the environmental problems such as water shortage and waterlogging. It is of great significance to realize the sustainable development of the city. In the construction of the sponge city demonstration project in China, the cities, landforms, engineering geology, hydrogeology, surface water and meteorological conditions of different regions are different. The emphasis of sponge city construction should be different. Beijing belongs to the waterlogging type of water shortage, but the main city is lack of water. This paper takes the construction of sponge city in the central district of Beijing as the background. The influence mechanism of physical and mechanical parameters of soil layer on formation storage and drainage is studied. Put forward a sponge city construction mode in which Rain Water can infiltrate into the formation and build a recharge well to introduce Rain Water into the aquifer while making use of natural resources as much as possible while making a large number of hard roads. According to the construction method of collecting and storing Rain Water by using strata, The influence mechanism of physical and mechanical parameters of soil layer on drainage and water storage is analyzed and revealed in depth. The main work and conclusions are as follows: (1) through the analysis of population distribution, land value, meteorological conditions and geological conditions in the central region of Beijing, Based on Rain Water's evaluation of water quality, referring to the current mode of use of Rain Water and combining with the actual situation in the central region, this paper puts forward the construction mode of sponge city in the central region of Beijing: under the condition of making use of trees, wetlands, rivers and lakes as far as possible, Emphasis is placed on the reconstruction of hard pavement in pedestrian walkways, parks, parking lots and other places so that Rain Water can infiltrate into the formation and build a recharge well to introduce Rain Water into the aquifer for the construction of a sponge city, and use the natural strata to save Rain Water. By reducing the construction of supporting facilities in sponge city, the analytical expression of soft soil consolidation caused by the lowering of aquifer water level under building load is established, and the consolidation behavior of soft soil under the change of relevant parameters is analyzed according to the analytical solution of consolidation. The influence mechanism of relevant physical and mechanical parameters on the consolidation and settlement of soft soil is revealed, which provides a theoretical basis for the calculation of the threshold value of stratum drainage.) the formula of horizontal displacement velocity and displacement calculation of surface soil layer under Rain Water infiltration are derived. The horizontal displacement velocity formula and displacement calculation formula of aquifer skeleton particles during Rain Water recharge are obtained, and the influence mechanism of relevant physical and mechanical parameters on horizontal displacement of soil is revealed. This paper provides a theoretical basis for the threshold calculation of formation water storage. (4) based on the grey correlation analysis method, the sensitivity factors of the related soil layer parameters affecting the formation drainage and water storage are analyzed, and the weights of the relevant parameters are ranked. The physical and mechanical parameters of soil layer which need to be analyzed in the reconstruction of hard pavement and the construction of recharge wells are determined. A new method for determining the resolution coefficient in grey correlation analysis is proposed. The rationality and correctness of the method are verified by two numerical examples. The FLAC3D software is used to simulate the physical and mechanical process of formation drainage and water storage, and the process of formation drainage and water storage is analyzed and evaluated by simulation results. The variation law of formation drainage and water storage is obtained, and the correctness of theoretical analysis and calculation results of formation drainage and water storage is verified.
【學位授予單位】：北京科技大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TU992

【引證文獻】

相關期刊論文 前1條

1 徐娜;張雷;;西北黃土區(qū)“海綿城市”目標下城市綠地設計探究[J];中國園藝文摘;2017年09期

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本文編號：1527967