Oedometer试验指标的剪刀型错误及用弦线模量的改正

Scissors Model Error of Oedometer Index and Its Correction by Chord Modulus

Oedometer试验测定的压缩模量值,不是随压力的增加而减小,反而是增加.这就是压缩模量值的剪刀型错误.用它计算的沉降量,误差也是剪刀型:对低压力、小基础偏大,对高压力、大基础偏小.Oedometer其它指标也有类似情况.弦线模量改正了这些指标的数值错误,消除了计算误差,从而成功地计算了黄土的湿陷变形.

With the pressure increase, the value of the modulus of compressibility, determined by oedometer test increases rather than decreases. This is the scissors model error of the modulus. Following the error, the computed results have similar difference greater than the actual value of low pressure and small foundation, and smaller than that of the high pressure and big foundation. The same problem also occurs in other index of oedometer test. The chord-modulus corrects this error and eliminates its difference. Thus, it sucessfully computes the collapse deformation of collapsible loess.