The Analysis Of Karst Hydro-geological Condition And Its Effect To The Engeneering In Kunming Airport

Kunming new airport will found in Xiaoshao town in Guandu and Libaichong, Hunshui pond in Daban town, which is about 24km far from Kunming. There are four programmed runways. The east central runmay is designed in 4000m length and 60m breadth, and the west central runway is about 4000m length and 45m breadth. According to the Chinese airport build program, Kunming new airport will be the only one which faces to the other asian countries in the later five years. So it's important to spread the reconnaissance immediately.This paper takes the airport's reconnoitered area as the important researched area. Then spread a lot of work for the hydrogeological condition and give some analyse following:1 .As expanding a lot of embeded work in the area, we find that although there is a small area to pool the water, it has a large groundwater resource. There are many springs,like Nan quan spring,Longquansi spring, which have the big flux, and there are several ponds formed in a line.2.The researched area develops on the karst physiognomy, there are 997 billabongs. The north mostly develops the covered type of karst, where the billabongs are deep and the walls are precipitous, especially in the Zhangjiapo area;And the south mostly develops the exposed type of karst, which often develops the big and deep billabongs, with the water holes on the bottom.3.According to the surface survey data, this paper partitioned the aquifer and the aquifuge first, and gave enough proof to demonstrate the character of the faults, such as F₁₀,F₁₂,F₁₈¹,F₁₆ and so on. Then we find that the F₁₀ is blocking the groundwater, and others can lead the water go through in the area.4.Based on the hydro-geological analysis and the fauls character, we took the F₁₀ fault as the blocking water bound, and partitioned two underground water systems, the north is the Yangguanzhuang reservoir spilling system, and the south is the Dabanqiao spilling system. 5.Next, based on the drilling data, the observation data of the surface water and groundwater, including the chemical data, we divided into seven hydro-geological cells, which have each supply, flowing and the drainage. The north divided into three cells: the Wusazhuang shiqiansi springs hydro-geological cell, the Wusazhuang nanquan groundwater cell, the Zhangjiapo shallow groundwater cell. The south divided into four cells :the Qinglong cave groundwater cell, the Longquansi pipeling cell, the Xunlianchang to Adicun shallow groundwater cell, and the Huanglong cave groundwater cell.6.The areas which develop the karsts belong to the flowage or the drainage on each cell. So we can conclude that the underground water controls the upgrowth of the karst in this area. In the north, the Hunshui pond groove and the pipeline areas have some developed pipes underground; In the south, there are the hall pipe like kh055, the Qinglong cave and the Huanglong cave systems have developed each pipeling system under the surface.7.The flowage of the Nanquan cell, including the Hunshui pond groove, the pipeline and the Shuidianshisiju billabong areas, and the drainage of the Zhangjiapo cell, are the instable areas, so it must be dealt with the engineering work.8.The north area is easy to arose the earth hole and the collapse by the strong rainfall because of the covered physiognomy. That's dangerous to the airport,so the respongding measures must be gave:l)To make sure the quality and the flux of the Wsazhuang springs, advise to change is folwing ways;2)Dealt with the big pipeling, we can adopt the strong rammer to deal with the collapse can raise the intensity of the land and reduce more collapse;3)Adopt the measure of strong rammer or grouting to aviod the surface water leak into the hole or the groundwater erode the earth; 4)Adopt the strong rammer to deal with the hole.