深厚砂土地基共振致密机理  

EFFECT OF RESONANCE-COMPACTION MECHANISM ON DEEP SANDY SOIL GROUND

作　　者：陈福全[1] 姚金梅[1] 李西斌[2] 陈伟丽[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]浙江农林大学园林学院,浙江临安311300

出　　处：《工程力学》2013年第7期105-112,共8页Engineering Mechanics

基　　金：国家自然科学基金面上项目(40972200)

摘　　要：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 resonance compaction of deep silty sand ground was simulated using a particle discrete element method, The behaviors of properties of the porosity, displacement and pore pressure in soil were analyzed during the process of resonance compaction, and the mechanical characters of soils around a vibrio-rod were researched. Simultaneously, the effects of the vibration frequency and amplitude and particles gradation on soil compaction were also investigated. The results show that the high frequency resonance compaction method is most suitable for the deep sandy ground improvement. During the construction process of resonance compaction, soil porosities decrease dramatically and the surface displacement is obvious. The mechanical characters of soil around the vibrio-rod are also changed greatly. The vibration frequency, amplitude of a vibrio-rod and the grain composition of soil can affect the dense degree of the ground. It can obtain the densest degree under the resonant vibration frequency and appropriate amplitude according to the characteristics of soil in a construction project.

关 键 词：颗粒离散元 共振致密 粉砂土 颗粒级配 地基处理 

分 类 号：TU443[建筑科学—岩土工程]