挖填工程影响下黄土丘陵沟壑区地下水数值模拟研究  

Numerical simulation of groundwater flow in loess hilly and gully area under the influence of excavating and filling engineering

作　　者：陈陆望[1] 曾文[1] 许冬清[1] 李圣杰[1] 张雪芹[1] 殷晓曦[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2017年第10期1404-1411,共8页Journal of Hefei University of Technology：Natural Science

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)

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。Taking the first stage project of Yan＇an new district as research area, three different numerical mod- els under the conditions of no-hardening and no-drainage, hardening and no-drainage, hardening and drainage are established by FEFLOW. After 50 years of long-term numerical simulation, the distribution of groundwa- ter level, burial depth, amplitude of variation and dynamic change of groundwater level under the three condi- tions are analyzed. Meanwhile, the spatio-temporal distribution of groundwater level and the evolution mecha- nism of groundwater flow field under the influence of excavating and filling engineering are investigate＆ The results show that the original landform would control the groundwater flow field after implementing excava- ting and filling engineering, and the artificial gravel drain plays an auxiliary role in accelerating groundwater drawdown. The rainfall infiltration and the area of the loess collapsibility would be reduced by the hardening measure, the groundwater level in the upstream and excavation area would be accelerated to steady state by artificial gravel drain. Hardening measure and artificial gravel drain make the groundwater level rise about 4-8 m in the filling area and decrease about 4-10 m in the excavation area and in the upstream. In the early simulation period, the dewatering efficiency of the secondary artificial gravel drain is higher than that of the main artificial gravel drain, and the main artificial gravel drain has a great effect on groundwater collection. However, the main artificial gravel drain will act the main function for water drainage in the 40-year simula-tion period. The results can provide theoretical basis for preventing the geological disaster in excavating and filling engineering in the loess hilly and gully area.

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 

分 类 号：P641.2[天文地球—地质矿产勘探]