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堆石料大量的大型三轴剪切试验结果表明,其轴向应变与径向应变关系并不完全符合双曲线关系,而是可以分成两段,依次用双曲线关系和直线关系来拟合,提出了一个计算两段关系拐点处径向应变的公式,对Duncan-Chang模型中泊松比的计算进行了修正。根据堆石料应力-应变关系试验结果,提出了一个用8参数拟合其应力-应变关系和体变关系的拟合方法,并将通过此方法得到的计算结果与试验结果进行对比,验证了拟合方法的精度。
A large number of large-scale triaxial shear tests of rockfill indicate that the relationship between axial strain and radial strain does not completely accord with the hyperbolic relationship, but can be divided into two sections, which are fitted by hyperbolic relationship and linear relationship A formula for calculating the radial strain at the inflection point of the two-stage relationship was used to correct the Poisson’s ratio in the Duncan-Chang model. According to the test results of the stress-strain relationship of rockfill, a fitting method of fitting the stress-strain relationship and the body-building relationship by 8 parameters is proposed. The calculated results obtained by this method are compared with the experimental results. The accuracy of the method.