Collapse Survey And Analysis On Concrete-pile Composite Foundation Of XinTai Expressway

Concrete-pile composite is ued widely.In general, it is successful but slump engineering often occur. Present national regulation adopt shear strength method for concrete-pile composite embankment to conduct stability analysis.But this method do not reflect reasonably principle of concrete-pile improving embankment.Although BS8006 can reflect the principle, however, BS8006 need calculate support that every pile give every slipping surface.Its promotion is difficult.Moreover,numerical analysis method exsit a problem of parameter selection so that its promotion is difficult too.On the basis of engineering geology, embankment design and build, embankment slumping and subside, tubular pile gradient and joint on XinTai expressway, analyze the effect on tubular pile gradient to support and the effect on tubular joint to embankment collapse.In addition, analyze embankment general shear sliding stability.Come to conclusion that the tubular pile gradient do not effect on design capacity and the tubular pile joint quality is not main factor in term of embankment collapse.Meanwhile,calculated result of present standard is different from actual situation.This paper propose revised density method based on BS8006 and take advantage of this method to analysis embankment flow slid stability.The collapse reason is deficiency from flow slid stability.Revised density method overcome BS8006 and load reduction method’s shortcomings.the method can use direct present normoal stability analysis software to analyzing embankment stability.Meanwhile,two slumping examples prove feasibility of the method.Combine collapse survey and analysis with present research results and draft the technical guide of subgrade engineering with tubular pile embankment.