The Karst Area Of ​​composite Pile Foundation And Application

Engionering construction of the region of developed canvity has being a critically difficult problem for a long time to engineering wnit which dsing and construct, to which had been paid much atlention by engiaeering' s world all over the coantry. Therefore, there should be an effect resolution and new regulation to the problem in our country, which should be come into being as quickly as possible.The article, based on the design and construction of the Bridge pile-foundation of the Ning-Heng Highway GuanYing Di in HuNax province, and directed by the theory of the researd and application of Bridge Pile' s specific property in the region of complexity canvity, analyses the present situation of developed canvity domestic and abroad and the effection of engineering' s construction and design, which summarizes some successful experiences of construction technical of compound-pile-foundation ,eguipment and quantity management, and probe into the basic principal and patterns of the compound-pile-foundation' s construction and design, Meanuhile, based on the achievements of the research of physical analogue test, numerous model and photoelastical test, we have designed the top panel as the thickness of bearing layer and deepness of rock-imbedded pile in complexity canvity' s region such projects of Bridge-pile-frundation in Guan YingDi, the pile-foundation of Biological center Building in csu, Bridge pile-foundation of shaoTan Highway, which prored it successfully. The new technical that is the compound foundation of man-digged pile+ high pressure chemical churning pile+ Steel work, was first be used to consolidate the canvity layer of the bottom paael of canvity' s top layer, which had been showed out standing etfect and save lot' s of money and shorted the construction period. The technical presents a safe quick economical and high quantity way for the pile-foundation' s construction in complicated canvity region and new theorial and practical referent materials for the researth and application in the region for engineering technitians.