【摘要】：為緩解延安老城的城市用地緊張局面,將進行城市造地工程建設新區(qū)。然而,城市造地工程活動會對黃土丘陵溝壑區(qū)地下水流場產生影響,進而改變當地工程地質環(huán)境：如水位過高地基土壤鹽漬化,破壞建筑基礎；水位忽高忽低容易引起黃土濕陷等。利用數值模擬技術研究造地工程影響下地下水流時空分布及其演化機制,對后續(xù)工程建設及水資源開發(fā)利用具有十分重要的意義,同時為黃土丘陵溝壑型城市造地工程中的地質災害與防治提供借鑒。本文在分析研究區(qū)地質和水文地質條件的基礎上,基于Feflow軟件和ArcGIS技術建立了研究區(qū)造地工程地下水流數值模型,城市造地工程數值模型包括地表不硬化溝底不設盲溝(工況A)、地表硬化溝底不設盲溝(工況B)和地表硬化溝底設盲溝(工況C)。對新區(qū)造地工程地下水流數值模型校正后,分別進行了三種工況下短長期地下水流數值模擬,預測了各工況在短期和長期地下水位變化、埋深分布以及盲溝排水效果。結果表明：新地貌對地下水位變化起支配的作用,導水盲溝則發(fā)揮輔助作用。硬化措施使地表水入滲補給相對困難,導水盲溝的鋪設顯著地改善了溝底地層的導水性,硬化措施和導水盲溝可使地下水水位降低約20m左右；在各工況下對比分析歷年水力梯度變化差值以及主溝、次溝的上游與下游水位差增大比的大小可知,次盲溝比主盲溝的疏排效率更高,但在50年模擬末期,主盲溝水力梯度大于次盲溝水力梯度,預測未來主盲溝將承擔主要疏排工作。
[Abstract]:In order to alleviate the tense situation of urban land use in Yenan Old City, urban land construction project will be carried out to build a new area. However, the urban land engineering activities will affect the groundwater flow field in the loess hilly and gully region, and then change the local engineering geological environment: such as the soil salinization of the high water level and the destruction of the building foundation; The fluctuation of water level can easily lead to loess collapsing and so on. Using numerical simulation technology to study the spatial and temporal distribution of groundwater flow and its evolution mechanism under the influence of land reclamation projects is of great significance for the subsequent engineering construction and water resources development and utilization. At the same time, it provides reference for geological hazard and prevention in loess hilly and gully urban land construction. Based on the analysis of geological and hydrogeological conditions in the study area, a numerical model of groundwater flow in the study area is established based on Feflow software and ArcGIS technology. The numerical model of urban land engineering includes no blind ditch (A),) and no blind ditch (working condition C). After the correction of the numerical model of groundwater flow in the new area, the short-term and long-term groundwater flow numerical simulation was carried out under three conditions, and the variation of groundwater level, the distribution of buried depth and the drainage effect of blind ditch were predicted in the short and long term. The results show that the new geomorphology dominates the change of groundwater level, while the blind channel plays an auxiliary role. The surface water infiltration and recharge is relatively difficult by hardening measures, and the water conductivity of the bottom stratum is significantly improved by the laying of the water conduction blind ditch, and the groundwater level can be reduced about 20 m by the hardening measures and the water conduction blind ditch. The difference of hydraulic gradient and the increase ratio of water level difference between upstream and downstream of secondary ditch are analyzed in different working conditions. It can be seen that the drainage efficiency of secondary blind ditch is higher than that of main blind ditch, but at the end of 50 years, the drainage efficiency of secondary channel is higher than that of main channel, but at the end of 50 years, The hydraulic gradient of the main blind ditch is larger than that of the secondary blind ditch, and it is predicted that the main blind ditch will undertake the main drainage work in the future.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P641.2

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