桩土复合路基静载试验的改进方法

为了克服现有复合路基静载试验的不足，通过引进能模拟实际垫层作用的弹性垫层，提出了一种改进的桩土复合路基静载试验方法。首先，通过数值模拟对不同工况下的静载试验进行分析，论证了引入弹性垫层的合理性；然后，对比不同工况下的桩土应力比以确定弹性垫层参数；最后，通过现场CFG桩复合路基试验，分析改进后静载试验在沉降及桩土应力比的变化规律。试验表明弹性垫层具有明显的应力调节作用，更能体现实际工程垫层的作用，为桩土复合路基的质量检测提供了一种新方法。

Improved Method of Static Load Test of Pile-soil Composite Roadbed

In order to overcome the deficiency of existing static load test of composite roadbed, an improved static load test method of pile-soil composite roadbed was proposed by introducing elastic cushion which can simulate actual cushion action.Firstly, the rationality of introducing elastic cushion was proved by analyzing static load test under different working conditions through numerical simulation.Then, the pile-soil stress ratio under different working conditions was compared to determine the elastic cushion parameters.Finally, through the field CFG pile composite roadbed test, the change rule of settlement and pile-soil stress ratio in the improved static load test was analyzed. The tests show that the elastic cushion has an obvious stress regulation effect, which can better reflect the effect of actual engineering cushion, and provide a new method for quality inspection of composite roadbed.