推算室内固结系数的剩余沉降对数法

Study on evaluation of consolidation coefficient

试样剩余沉降(最终沉降与沉降的差值)的对数与时间呈线性关系,由线性方程的系数可推算出试样的固结系数。采用最小二乘原理估计线性方程的系数时需事先确定最终沉降,由于线性方程的线性相关系数是最终沉降的函数,为使线性拟合达到最佳,最终沉降应使线性相关系数取到极值,根据这一条件可解析出最终沉降。与推算固结系数的时间平方根法和时间对数法等方法相比,本文方法无需固结试验初始阶段和最后阶段的数据,从而避免了初始沉降和后期次固结沉降的影响,并加快了固结试验的进程。

The logarithm of residual settlement is linearly related with the time. From this relationship, a new method can be developed to evaluate the coefficient of consolidation.Data of early and last periods of the test are not needed for the method put forward in this paper, so the influence of the initial and the secondary compression is avoided. At the same time, the new method also can accelerate the consolidation test.