压实砂类土体PFWD动态变形模量的影响及预估

选取大别山区典型花岗片麻岩风化砂土填料制备压实非饱和试样，采用便携式落锤弯沉仪（PFWD）进行动态变形模量室内测试，分析相应的变化规律，建立预估模型，研究含水率和压实度对砂类土体力学性能的影响。结果表明:砂类土体动态变形模量与含水率呈幂函数负相关关系，而与压实度呈S型函数正相关关系，且压实度对动态变形模量的影响要比含水率的影响更为显著；经试验验证，综合预估模型的精度较高且具有良好的适用性。

Influence and Prediction of PFWD Dynamic Deformation Modulus for Compacted Sandy Soil

The typical weathered sandy soil filler of granite gneiss in Dabie Mountain Area was selected to prepare the compacted unsaturated samples. The dynamic deformation modulus was tested by portable falling-weight deflectometer (PFWD) in laboratory. The corresponding variation laws were analyzed, and the prediction models were established. The influence of water content and compaction degree on the mechanical properties of sandy soil was studied. The results show that the dynamic deformation modulus of sandy soil is negatively correlated with water content in a power function, and positively correlated with compaction degree in an S-type function. The influence of compaction degree on dynamic deformation modulus is more significant than that of water content. The experimental verification shows that the comprehensive prediction model has high accuracy and good applicability.