刚性桩复合地基尺寸效应试验研究

doi:10.13722/j.cnki.jrme.2014.1257

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Abstract In order to study the influence of foundation scale on the bearing capability of rigid pile composite foundation，several groups of model tests such as the load tests under four different scale plates，foundation soil load test，composite foundation load tests and single pile load tests，were carried out using a model test apparatus made in-house. A series of test results were acquired. The results showed that with the same loading stress and pile replacement ratio，the composite foundation settlement and pile-soil stress distribution ratio increased with the increasing of loading plate scale. The load carried by the pile increased at the same time. Based on the test results，the scale effects of rigid pile composite foundation were analyzed from a theoretical point of view. The composite foundation load test did not perfectly represent the load bearing characters of the actual composite foundation because of the scaling effects. A new method to calculate the bearing capacity of the ground by overlapping the single pile and soil p-s curves were put forward to solving the problems of scale effects of composite foundation. Calculated results of model tests and engineering example showed that the method was feasible.

Key words： foundation engineering rigid pile composite foundation bearing capacity behaviors scale effects model test pile-soil stress distribution ratio

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.1257 OR http://www.rockmech.org/EN/Y2016/V35/I1/187

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