Test Study on Bearing Characteristics of Pile-Plank Foundation in Sandy Soil
In order to optimize the design of pile-plank structure,laboratory model test was carried out on pile-plank foundation in sandy soil.The test analyzed the load-subsidence relation of pileless foundation and pile-plank foundation under the action of vertical load,and studied the effect of pile spacing,pile length and pile diameter on the ultimate bearing capacity of foundation soil and the bearing ratio(BCR).The results show that,compared with pileless foundation,pile-plank structure may increases the bearing capacity of foundation significantly and decreases the subsidence of foundation;the pile length has relatively small effect;the pile diameter has such largest effect on ultimate bearing capacity that,when the pile diameter increases from 15 mm to 35 mm,the bearing capacity of foundation increases by 117％on the working condition of the same settlement of 20 mm;the increase of the ratio of pile spacing to pile diameter reduces the slope of load-subsidence relation curve at the stage of slow deformation,defers the load level at the time of shear failure of soil mass,and decreases the settlement deformation corresponded to the ultimate bearing capacity;when the pile spacing is 4 times of the pile diameter,the pile-plank-soil coupling effect may be given full play,and leads to maximum bearing capacity of foundation.
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