CAJ | 학술논문

为了分析土壤特性与振动压路机在振动压实过程中的动态相互作用关系,提高压实效果,对振动压实过程中土壤刚度、阻尼、土体随振质量及土的固有频率等参数进行动态识别.用相似理论与模型试验法在确定了模型与原型之间的几何相似比并满足载荷相似条件后,根据模型试验结果推导出了原型土体参数;用方程对等法把受简谐激振力作用的振动轮等效为集中质量振动系统,以此作为振动压实过程的力学模型,根据振动微分方程的等效条件进行识别;用幅频特性曲线拟合法以振动压路机-土壤系统动力学方程为基础,用计算机进行动态仿真.分析表明:土的刚度和阻尼,不仅与被压实时土的初始状态、环境温度和湿度等因素有关,而且随振动压实过程中压实度的变化而改变.
위료분석토양특성여진동압로궤재진동압실과정중적동태상호작용관계,제고압실효과,대진동압실과정중토양강도、조니、토체수진질량급토적고유빈솔등삼수진행동태식별.용상사이론여모형시험법재학정료모형여원형지간적궤하상사비병만족재하상사조건후,근거모형시험결과추도출료원형토체삼수;용방정대등법파수간해격진력작용적진동륜등효위집중질량진동계통,이차작위진동압실과정적역학모형,근거진동미분방정적등효조건진행식별;용폭빈특성곡선의합법이진동압로궤-토양계통동역학방정위기출,용계산궤진행동태방진.분석표명:토적강도화조니,불부여피압실시토적초시상태、배경온도화습도등인소유관,이차수진동압실과정중압실도적변화이개변.
To analyze the dynamic interplay of soil characteristics with working parameters of vibrating roller during vibrating compaction process and improve the compaction effect, dynamic identification of the soil parameters such as rigidity, damping, soil additional vibrating mass and natural frequency was conducted.When the geometric similitude ratio of the model to the prototype was determined and the loading similitude condition was satisfied by using similitude theory in structure modeling and experimental techniques, the prototype soil parameters were derived according to the model test result. The vibrating wheel compelled by harmonic exciting force was treated as a lumped mass vibrating system by equation equity method. By using this mechanical model in vibrating compaction, soil parameters were identified according to the equivalence of vibrating differential equation. The curve fitting method of amplitude versus frequency response was used for dynamic simulation based on the systematic dynamic equation of vibrating roller-soil system. Analytical result shows that the soil rigidity and damping were determined not only by the initial state of compaction, environmental temperature and humidity but also by the varying of compaction degree during vibrating compaction.