关键词: 排水刚性桩, 土压力, 现场试验, 沉桩

Abstract: The anti-liquefaction-rigid-drainage pile is a new pile type combining the bearing capacity of rigid pile and the drain ability of gravel pile. In a pile foundation project, pile driving field tests of the rigid-drainage pile were carried out. The horizontal and vertical soil pressures around drainage piles and ordinary piles were recorded in different locations and depths using dynamic sensors during field tests. According to these test results, rigid-drainage pile can reduce the disturbance of soil pressures during pile driving. At the location 0.6 m far from the pile center in the depth -15 m, the peak horizontal soil pressure around the rigid-drainage pile is a quarter of the ordinary pile’s. The rigid-drainage pile can reduce the impact of pile driving on the effective stress in soil, which makes the liquefiable soil around rigid-drainage piles more stable. In the depth of -5 m, the effect of rigid-drainage piles on soil pressure is not obvious. In deep depths (-10, -15 m), the effective influence radius of rigid-drainage piles is about 4 times as large as the pile diameter. The data of piles tests provide other engineers with reliable evidences.

Key words: rigid-drainage pile, soil pressure, field test, pile driving