挖填工程影响下黄土丘陵沟壑区地下水数值模拟研究

发布时间：2018-01-24 09:32

本文关键词： 地下水数值模拟挖填工程地下水流场导水盲沟黄土丘陵沟壑区　出处：《合肥工业大学学报(自然科学版)》2017年10期 　论文类型：期刊论文

【摘要】：文章以延安市新城北区一期工程为典型研究区,利用FEFLOW软件建立无硬化无导水、硬化无导水、硬化导水3种工况的数值模型。经过50a模拟,对比分析3种工况的地下水分布、埋深、变幅及地下水位动态变化,分析挖填工程影响下的地下水流时空分布及其稳定机制。研究结果表明:原始地形是控制地下水流场的主要因素,导水盲沟起着辅助作用;填土硬化能减小地表水入渗与黄土湿陷的面积,导水盲沟使上游和开挖区地下水及早稳定,填土硬化和导水盲沟措施使开挖区和上游水位下降4~10m,填土区水位上升4~8m;在模拟前期,次盲沟疏排效率比主盲沟疏排效率更高,主盲沟主要起到汇集地下水的作用,在40a模拟期后,主盲沟将承担主要疏排水工作。研究成果可为黄土丘陵沟壑区型城市"削山填谷"过程中的地质灾害防治提供理论依据。
[Abstract]:Taking the first phase project of Xincheng North District of Yan'an City as a typical research area, the paper establishes a numerical model of no hardening without water conductivity, hardening without water conductivity and hardening water conductivity with FEFLOW software. The model is simulated for 50 years. The groundwater distribution, buried depth, amplitude variation and dynamic change of groundwater level in three working conditions are compared and analyzed. The temporal and spatial distribution of groundwater flow and its stabilization mechanism under the influence of excavation and filling engineering are analyzed. The results show that the primary topography is the main factor controlling the groundwater flow field and the blind channel of water conduction plays an auxiliary role. Fill hardening can reduce the area of surface water infiltration and loess collapsibility, water diversion blind ditch can stabilize groundwater in upstream and excavation area as early as possible, and fill hardening and water diversion blind ditch measures can reduce water level in excavation area and upstream water level by 4 ~ 10 m. The water level in the fill area increased by 4 ~ 8 m; In the early stage of simulation, the efficiency of secondary blind ditch drainage is higher than that of main blind ditch, the main blind ditch mainly acts as a collection of groundwater, after 40 years of simulation period. The main blind gully will undertake the main drainage work. The research results can provide a theoretical basis for the prevention and control of geological hazards in the process of "clipping mountains and filling valleys" in loess hilly and gully cities.
【作者单位】：合肥工业大学资源与环境工程学院;
【基金】：国家自然科学基金资助项目(41372244) 中央高校基本科研业务费专项资金资助项目(JZ2016HGBZ0802)
【分类号】：P641.2;TU751
【正文快照】： 地下水是影响城市生态环境复杂系统的一个重要因子,随着人类改造自然能力的提高,规模越来越大,地下水从数量和质量上受到影响,阻碍了城市化进程和城市的可持续发展[1-3]。延安市地处黄土丘陵沟壑区,现政府决定拓展城市发展空间,对丘陵沟壑地区实施挖填工程建设新区[4]。但是,

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