计算机模拟地质化验室分样及取样常数K_(s)的估算

Computer Simulates Sampling in Geo-laboratory and the Evaluation of the Sampling Constant K_(s)

提出了计算机模拟地质化验室取样过程,考察取样误差与取样量、样品粒度之间关系,并估算取样常数。实验所得的误差与取样量之间的关系与Ingamells的取样方程一致,取样常数及取样常数和样品粒度关系式也与Ingamells推导的相符。由于计算机模拟是一颗颗取样,不用预设分布模式,不存在分析方法误差和分样操作误差的叠加,误差完全是因样品本身不均匀产生的。而且计算机模拟运算速度快,参数变换方便,使模拟更接近样品实际,能满足地质化验室的应用。

In this paper,a computer procedure to simulate the sampling processes in geo-laboratory was introduced,which studied the relations among sampling weights,grain sizes and variances of samples for analysis.The simulating studies showed that the products of relative variance and sampling weight are a constant,which is consistent with Ingamells sampling equation,and the constant is the Ingamells sampling constant Ks.The studies showed that as Ingamells had reduced Ks calculated formula,the sampling constant Ks is proportional to cubic of grain size.Because samples were drawn from their mother samples by counting grains one by one in simulating,they didn’t need any presupposition of distribution model.And the resulted errors did not contain the contributions from analytical step and sample preparation,errors came from the heterogeneity of samples only.Moreover,computers operate more quickly and are convenient to alternate parameters,these made simulations closer to reality of samples.