Experimental Study Of Foundation Bored Piles In The Jianghan Plain

The cast-in-place pile has become the major foundation form to road and bridge construction for the feasible practice of various geological structure, load bearing and strong resistance to earthquake. Since the pebble structure is of big pellet easy to be permeated ant it is difficult to smash and drill, the appliance with big diameter and deep cast-in-place pile has been greatly restricted. In this case, the experimental and practical data and information is not quite enough for reference and accurately indicate the experienced physical index for design. Considering the engineering of trail pile in Hubei Jingzhou Yangtze River Highway bridge, the construction process of deep cast-in-place pile under pebble geological structure, the limit load-bearing capacity of single pile, side friction stress and head drag are researched in this thesis deeply.It is stated clearly by researching, the cast-in-place pile must be constructed according to strict technological process on condition that pebble geological structure, and more important that the drilling technology and the reasonable property index of mud are chose correctly on the basis of the condition of pebble geological structure.It is provided by the result of observing for the trial of pile, if the cast-in-place is constructed according to strict technological process, the limit load-bearing capacity of single pile is more larger then its calculational value, and under the function of the most trial loading, the frictional drag haven' t occur yield in every major loading layer, so the pile have greatly safety reserve in engineering.In this thesis, the technological way that prevent the anchorage pile and the concrete of anti-force beam from crazing, and the technological application of ultrasonic determine apparatus to detecting are introduced during engineering of trial pile by inducting prestressed technology to anchorage pile and anti-force frame.