基于减小筏板差异沉降的刚性桩复合地基试验研究

Experimental study to reduce differential settlements of raft of composite foundation with rigid piles

针对高层建筑筏板荷载分布特点,采用内密外疏布桩和仅在筏板中心布桩方式,通过现场缩尺(1:10)模型试验,完成了带上部结构无桩筏板和刚性桩复合地基筏板静载荷试验。分析了筏板沉降、桩端平面以下地基沉降和筏板外侧地面沉降、筏板下桩土反力分布、桩土荷载传递及桩土荷载分担比。研究了工作荷载下不同布桩方式降低筏板差异沉降的效果。

Based on the load distribution on the raft of high-rise buildings, different pile arrangement was adopted that more piles were used in the center than on the edge or piles were only arranged in the center area. Through model tests（1：10）, the static load tests on unpiled raft and rigid composite foundation with super structure were carried out. The raft settlements, subgrade settlements under pile bottom plane, settlements of ground beside raft, distribution of reaction force from soil and pile top, load transfer and load share ratio between piles and soil were analyzed. The effect of different arrangements of piles to reduce differential settlements of raft was studied under working loads.