柔性基础下复合地基试验研究综述

Review of Experimental Studies on Composite Ground under Flexible Foundation

对近10年来缩尺试验和足尺试验研究成果的总结和分析,结果表明:柔性基础下复合地基工作性状是柔性基础、垫层、复合地基及下卧层四者之间相互作用与应力应变耦合的结果;除桩土应力比外,桩土沉降差、土拱效应、中性点位置、土工格栅作用等也应得到重视;正交设计或均匀设计尚未广泛应用于试验;有必要将解析解、室内试验与原位测试、缩尺试验、数值模拟和足尺试验结合起来开展研究。

Based on summary and analysis of studies on reduced scale and full-scale experiments in recent ten years, it is concluded that （1） the behavior of the composite ground under the flexible foundation is the result of the interactions and stress-strain coupling among the flexible foundation, the cushion, the composite ground and the underlying stratum; （2） in addition to pile-soil stress ratio, the differential settlement between pile and soil, the soil arching effect, the position of the neutral point and the effect of reinforced geogrid should be paid more attention; （3） the orthogonal design or uniform design are not widely used in experiments; （4） it is necessary to comprehensively apply the analytical solution, the laboratory and in-situ tests, the reduced scale experiment, the numerical simulation and the full-scale experiment to the research.