地基中压力变化对弹性均压系数的影响

到目前为止,在所有动力机器基础设计规范中均未考虑基底下不同深度处土体所受压力的变化对土体弹性模量和地基弹性均压系数Cz的影响,而只考虑基础底面面积对Cz值的影响。但是,研究结果表明,地基的弹性均压系数不仅与基底面积有关,而且与所受压力的大小有很大关系。在确定Cz值时,考虑土体所受压力的作用是十分必要的,它将大大改善基础振动计算的准确性。

EFFECT OF VARIATION OF PRESSURE IN SOIL ON THE COEFFICIENT OF ELASTIC UNIFORM COMPRESSION OF BASE

Up to now,in all codes for design of dynamic machine foundation,the effect of variation of pressure in soils at various depths under foundation base on the value Cz of the coefficient of elastic uniform compression of base was not considered.All these codes of design only considered the effect of area of foundation base on the coefficient Cz.However,the results of research of this paper verify that the coefficient of elastic uniform compression depends not only on the area of foundation base but also on the acting pressure on soils.When determing the coefficient Cz,considering the effect of pressure on soil is fully necessary.On the basis of that one,the precision degree of computing of foundation vibration will be improved considerably.