基于泊松比的土石混填地基应力波测试研究
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摘要
设计土石混填料大型振动压实仪,对砂土、粉土、低液限黏性土3种土石混合材料进行不同含水量、不同含石量下振动压实实验。采集相关土压力,计算混填料试件压实过程中的动泊松比,研究不同压实状态下混填料各向变形性能。研究土石混填料动泊松比变化规律,建立密实状态下混填料泊松比相关性分析模型。对工程中动泊松比参数变化引发的混填料剪切波速变化进行敏感性影响分析,结果表明,工程中测试土石混填地基剪切波速时,混填料动泊松比对剪切波速影响较小,可直接采用混填料在固定含水率、固定含石量下最密实状态泊松比对现场混填材料进行相关参数标定。在此基础上建立土石混填料面波-剪切波相关性模型,并开展现场试验对模型进行验证,取得了较好效果。
The equipment of large vibration compaction was designed to do large laboratory vibration compaction test under the condition of different water content and different soil-stone proportions with sandy soil,silt soil and low liquid-limit clay. The soil pressure was collected to calculate the dynamic Poisson's ratio,and then the deformation capability in each direction of foundation mixture in different compactness was studied. The change rule of dynamic Poisson's ratio in soil-stone mixture was revealed. The correlation analysis model of Poisson's ratio in soil-stone mixture was built. Sensitivity analysis on change of shear wave velocity in soil-stone mixture caused by change of dynamic Poisson's ratio was conducted. The results showed that the dynamic Poisson's ratio had little influence on shear wave velocity in soil-stone mixture,while the field shear wave velocity test of soil-stone foundation was done. The correlation parameters of soil-stone mixture could be calibrated and determined by Poisson's ratio in most compact condition under fixed water content and fixed soil-stone proportion. Then the model of correlating surface wave and shear wave was built and field-verified,and a favorable effect was obtained.
引文
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