Groundwater monitoring and numerical simulation under the influence of linear engineering in karst areas: A case study of the Jinshazhou area, Guangzhou City
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摘要: 以广州市金沙洲地区的水文地质条件及地下水位监测结果为基础,应用地下水数值模拟FEFLOW软件建立了金沙洲地区的地下水系统的数值计算模拟模型.模拟结果表明:(1)高铁金沙洲隧道施工降水是引起金沙洲地下水流场变化的主要原因,高铁隧道施工大量抽排地下水时,地下水位变化形成以抽水点为中心的降落漏斗;(2)随着抽水量的加大,形成水位下降漏斗及地下水强径流排泄带,加速地下水对泥沙的搬运动力,增大对岩土体结构的冲刷作用,使与岩溶管道连通的土洞及覆盖层稳定性受到破坏,从而导致地面塌陷的发生;(3)随着地下水水位的下降,金沙洲一带的软弱淤泥土容易出现排水固结沉降和失托沉降,从而产生地面沉降灾害.Abstract: This paper establishes a conceptual model of the groundwater system by generalizing the hydrogeological conditions,and then builds a numerical simulation model of groundwater flow in the study area based on FEFLOW.The simulation shows that groundwater flows to the center from the surroundings during the construction of pumping,and forms a depression cone.The simulation results areconsistent with the geological disasters both in time and space.According to the study results,the pumping intensity should be strictly controlled in the Jinshazhou to prevent ground collapse and ground subsidence.
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Key words:
- karst collapse /
- groundwater /
- Jinshazhou /
- numerical simulation
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