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利用颗粒离散元对深厚砂性土地基进行共振致密模拟与机理分析,详细地研究了高频共振致密过程中,土体内部孔隙率、位移、孔隙水压力的变化情况,以及振动杆杆端及杆周土体的力学特性;对振动频率、振幅及颗粒级配对共振致密效果的影响进行了分析。结果表明:高频共振致密能很好地用于处理深厚粉砂土地基,振动结束后,土体的孔隙率明显减小,表层位移明显,振动杆杆端及杆周的土体力学特性也发生较大变化;共振致密的效果受振动杆振幅、频率及土体级配状况等因素的影响,振幅和频率过大或过小都无法获得最佳致密效果。在实际工程中,应根据土体的特性确定最佳的振幅和频率。
The particle dispersion element is used to simulate and analyze the mechanism of deep sand sandy soil foundation. The changes of porosity, displacement and pore water pressure in the soil during high-frequency resonance densification are studied in detail. The mechanical properties of the soil around the rod are analyzed. The effects of vibration frequency, amplitude and particle size distribution on the resonance density are analyzed. The results show that the high-frequency resonance can be well used to treat deep silt subsoil. After the vibration is finished, the porosity of the soil decreases obviously and the surface displacement is obvious. The mechanical properties of the soil at the rod end and the rod circumference Great changes have taken place. The effect of dense resonance is affected by factors such as the amplitude and frequency of the vibrating rod and the gradation of the soil mass. The amplitude and frequency are too large or too small to obtain the best compact effect. In practical engineering, the best amplitude and frequency should be determined according to the characteristics of soil.