The general attenuation law of ground vibration caused by heavy tamping is verified by spectrum analysis in this paper . moreover , the relationship between attenuation index and standard penetration number is created through combination analysis of vibration attenuation and surface wave propagation 在此基础上,通过面波分析,得出了场地介质衰减指数和表征场地介质性质的参数?标准贯入击数之间的关系,给出了表达式的一般形式。
In the thesis domestic and foreign relation model of standard penetration blow count and shearing velocity , standard penetration blow count and deformation modular , shearing velocity and foundation bearing capacity are analyzed . on base of these analysis a new calculation model that applying rayleigh wave velocity to calculate the stress ratio of pile and soil between piles is established . because of the difference of region and soil character , the new model own three branch model , ie , japan model , wuhan model , xia liaohe mo del , in three different conditions 文章通过分析国内外标准贯入击数与剪切波速、标准贯入击数与变形模量、剪切波速与地基土承载力之间的关系模型,并考虑到地区性和土质类别的差异,分别选用日本公路桥梁抗震设计新规程模型(日本模型) 、武汉地区模型、下辽河平原模型三种模型建立了新的桩土应力比计算模型? ?应用瑞雷波速求解桩土应力比之间的计算模型。
The results show that the water soaking is vital to microstructure , its influence on shear strength is higher than it on deformation properties of clayey soil obviously ; when number of blows of more wet and vibrated soil increased , the damage of initial construction increased , but the later strength of construction increased for a little 结果表明,水的浸入对土的微结构特性影响至关重要,对土的抗剪强度的影响明显高于土的变形特性,偏湿上和受振动的土击数越多,对土的初始结构损伤越厉害,但土的后期结构强度有所提高。
In the comprehensive fuzzy evaluation model of soil liquefaction , the following factors , such as earthquake intensity , spt counts , groundwater level and mean diameter of sand soil particle which affect the liquefaction of sand soil were considered , and the sketch map of trapezoid subordinate function was adopted and the subordinate function expression of each factor was given 在提出的砂土液化模糊综合评判模型中,通过综合地震烈度、标贯击数、地下水位和平均粒径等影响砂土地震液化的因素,采用梯形隶属函数并分别给出各因素隶属函数的表达式。