Study To The Construction Technics And Loading Capacity Of The Borehole Cast-in-place Concrete Pile In The Karst Terrain

The karst terrain, specially the karst pile is the difficult problem of engineering of the reconnaissance, design, construction. In the past emergence rock dissolves the thing problem not much, as to it' s the lading delivers mechanism and glazing rock depth area curves and hold the problem of towing force top plate less. In recent years, along with the scale of engineering with the enlargement of the capital construction land ward, especially express highway with enlargement developments of the railroad, met the top already and continuously the complicated karst problem. For example, the Ji' an Ganjiang grand bridge on Jingjiu route, the great bridge of public highway from Nanchang to Jiujiang, the Wanchun great bridges and this text a Baibie harbor great bridge engineering etc..This article aims at the characteristics of a Baibie harbor great bridge, by the spot construction test and mechanicses, limited an analysis, dissolve to the construction technics and loading capacity, stake deliver mechanism, bearing stratum and glazing rock depth area curve etc. s of the borehole cast-in-place concrete pile in the karst terrain do the some study research.By the check-out, inspection and measurement to start construction the industrial art to this test pile with the examination between stake body mass and bearing power, made sure the stroke reasonable operation method drilling under the dissolved cavern geology term; The pier foundation loading test expressed the lading and rub the lading that resistance drag a glazing for of relation, and to the borehole cast-in-place concrete pile in the karst terrain deliver with break the mechanism, the characteristicof bearing power, proceeding the spot test job of the full of result; The test data expresses the stake side friction resistance to rises with a bat batch terminal friction resistance very important function, the of tip of pile resistance drag occupies the proportion very few. This differ with computation modal that design the foundation pier very big, bearing power too than design increment; Usage mechanics numerical analysis device with limited a logarithm of timw fitting method logt, noted the rock strength in stake tip of the borehole cast-in-place concrete pile to proceed with the structure steadiness the simulation compute to study with the fixed amount, designing for the engineering to start construction to provide for science with the spot.