To understand the mechanical behavior characteristics of soil-rock mixture filled foundations in the Chengdu Plain under high-energy compaction,field tests including single-point compaction and full-area compaction were conducted.The settlement of the foundation and dynamic stress in the soil during the dynamic compaction process were measured to establish the relationship between the settlement and the number of blows.The test results indicate that:(1)The growth rate of settlement in the soil-rock mixture filled foundation gradually decreases nonlinearly with an increasing number of blows,and the optimal number of blows under a compaction energy of 4 000 kN·m is 10 times.(2)The dynamic stress in the foundation decreases nonlinearly with increasing vertical depth or radial distance from the compaction point,with the average attenuation gradient along the radial direction being greater than that along the depth.The attenuation gradient of radial dynamic stress within the hammer diameter is more significant than that outside the hammer diameter.(3)The effective reinforcement depth of the soil is significantly correlated with the compaction energy.(4)The estimated dynamic stress values obtained using the equivalent quasi-static method are 0.48 to 0.73 times the measured values.The research findings provide a reference for dynamic compaction techniques applied to similar mixed-fill foundations.
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