Depth of strong development of karst based on quantitative factors of hydrodynamic conditions

Abstract

The hydrodynamic condition of groundwater vertical circulation is the main factor to control the development depth of karst.In order to explore the karst strong development depth under the multistage flow system in the anticline karst area of East Sichuan.The quantitative factor of karst hydrodynamic strength(FHQ) is constructed by using GIS technology and selecting topographic index and hydrodynamic gradient.Combined with drilling data, the depth of strong development of underground karst in Jiajiao Mountain anticline structure area is calculated.The results show that the hydrodynamic factor FHQ is positively correlated with topographic index and hydrodynamic gradient in space.At the same time, it can indicate the depth of deep circulation of karst water flow system, so as to calculate the lower limit of strong development depth of underground karst in anticline structural areas.The FHQ of the two wings of the Jiajiao Mountain anticline is between 0.1 and 0.4, the karst hydrodynamic force is generally weak, and the FHQ value of the deep ditch is generally higher than that of the shallow ditch.The strong development depth of underground karst under the control of deep trenches in the east and west wings of anticline is about 40-100 m and 110-180 m respectively.It is hoped that the research results will further enrich the evaluation method system of karst development in east Sichuan anticline area.It also provides a theoretical basis for the prediction and prevention of karst water inrush disaster in tunnel engineering.

Keywords

• multistage flow system
• karst hydrodynamic condition
• quantitative research
• karst strong development depth