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Volume 41 Issue 1
Feb.  2022
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Article Navigation >  CARSOLOGICA SINICA  > 2022  >  41(1): 124-132
HU Zheng,TIAN Maozhong.Study on the influence of surface water on anti-floating water level and the value taking of the level in karst sites[J].Carsologica Sinica,2022,41(01):124-132. doi: 10.11932/karst2021y14
Citation: HU Zheng,TIAN Maozhong.Study on the influence of surface water on anti-floating water level and the value taking of the level in karst sites[J].Carsologica Sinica,2022,41(01):124-132. doi: 10.11932/karst2021y14
shu

Study on the influence of surface water on anti-floating water level and the value taking of the level in karst sites

doi: 10.11932/karst2021y14
  • 1.

    Guiyang Engineering Corporation Ltd.， Power Construction Corporation of China， Guiyang， Guizhou 550081， China

  • 2.

    Guizhou BIM Engineering and Technology Research Center， Guiyang， Guizhou 550081， China

Funds:

 GYY-KY-2015-14

 黔科合平台人才[2019]5301号

  • Received Date: 2020-04-18
  • Publish Date: 2022-02-25
    Abstract
  • Aiming at the karst site in Guizhou， this paper studies the anti-floating water level values of four different surface water sites， i.e. the distribution site near lake or reservoir， the site near river bank， the site of river bend and river delta. The following conclusions are obtained， （1） When the thickness of phreatic aquifer is greater than the depth of foundation， the maximum groundwater level of the site is consistent with the anti-floating water level. If the site is located in the low-lying area or in the distribution area of confined aquifer， the anti-floating water level is higher than the groundwater level. （2） The value of anti-floating water level can be obtained by the sum of the following three， the maximum groundwater level （Hkmax） in the site during the survey， the amplitude of the groundwater level of this layer caused by possible accidental recharge （ΔH0） and the maximum amplitude of groundwater in this layer during relative survey （ΔHe）. （3） For the site near the lake or reservoir， the value can be obtained by the inverse method or empirical method， and the maximum groundwater level of the site in the flood period can be deduced by the hydraulic gradient between the site and the lake （reservoir）. For the site near the river bank， the value shall be obtained based on the highest historical flood level. For the river reach without water level observation data in historical period， the value shall be obtained based on the highest historical flood level investigated on site， the karst development degree of the site， the distance between buildings and rivers， and the comprehensive analysis of hydraulic gradient. The value shall be added by 0.5-1.0 m based on the historical highest flood level. For the river reach that has been designed and controlled， the value shall be obtained based on the designed flood level. For fragile underground buildings， the value is suggested to be obtained based on the checked flood level， and then based on the karst development degree of the site， the distance between the buildings and the river， and the comprehensive analysis of hydraulic gradient. For the site in the river bend the value shall be obtained based on the historical highest flood level， hydraulic gradient， the integrity of the site rock mass， and the degree and scale of karst development. It is appropriate to increase 0.5-1.0 m in the site with sufficient rock permeability and karst penetration. For river delta， the value shall be obtained based on the direction of underground runoff， the hydraulic gradient with the river and the maximum water level at the project location. It is appropriate to increase 0.5-1.0 m in the site with sufficient rock permeability and karst penetration. This study is of reference significance for the engineering construction in karst development area.

     

    • HU Zheng,TIAN Maozhong.Study on the influence of surface water on anti-floating water level and the value taking of the level in karst sites[J].Carsologica Sinica,2022,41(01):124-132.
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