多参数统计均质区划分——以马吉水电站为例

发布时间：2018-04-01 09:31

本文选题：统计均质区　切入点：秩和检验　出处：《岩土工程学报》2017年01期

【摘要】：引入秩和检验非参数统计方法,建立不连续面岩体统计均质区评价模型。文中考虑了不连续面产状、迹长两个参数,在随机数学的基础上提出了一种不连续面岩体统计均质区划分的新方法,即利用秩和检验计算研究区样本之间的相关性,从而合理划分不连续面岩体统计均质区。选取云南省马吉水电站左岸坝肩某两高程4个平硐作为研究对象,首先将产状数据用其法向极点与单位圆上半球被划分为100个等面积四边形小方格的交点来表示;其次,根据迹长从小到大对落入小方格的极点进行编秩;最后,基于秩和检验来分析不连续面落入相应小方格的频率。研究结果表明:PD201和PD251以及PD251和PD253不具有统计相似性,而PD241和PD253、PD201和PD241在不同的比较区域下得到不同的均质区评价结果,这说明统计均质区存在尺寸效应。较Miller仅考虑不连续面产状,本文同时考虑了产状和迹长两个因子,结果更加合理。此外,该方法可以应用到小样本不连续面统计均质区划分中。
[Abstract]:The nonparametric statistical method of rank sum test is introduced to establish a statistical homogeneous zone evaluation model for discontinuous face rock mass. Two parameters, discontinuous plane occurrence and trace length, are considered in this paper. On the basis of random mathematics, a new method of statistical homogeneous division of discontinuous rock mass is proposed, that is, using rank sum test to calculate the correlation between samples in the study area. In order to divide the statistical homogeneous area of discontinuous rock mass reasonably, four adit of two elevation on the left bank dam abutment of Maji Hydropower Station in Yunnan Province are selected as the research object. The occurrence data is first represented by the intersection of the normal poles and the upper hemispheres of the unit circle into 100 quadrilateral small squares of equal area; secondly, the poles falling into small squares are ranked according to the trace length from small to large; finally, Based on rank sum test, the frequency of discontinuous surfaces falling into the corresponding small squares is analyzed. The results show that: PD201 and PD251 and PD251 and PD253 do not have statistical similarity, while PD241 and PD253 PD201 and PD241 have different homogeneity evaluation results under different comparison regions. This indicates that there is a size effect in the statistical homogenization region, and it is more reasonable to consider both the occurrence and trace length of the discontinuous surface in this paper than in Miller. This method can be applied to the statistical homogeneous division of small sample discontinuous surfaces.
【作者单位】：吉林大学建设工程学院;
【基金】：国家自然科学基金重点项目(41330636) 吉林大学研究生创新基金项目(2016208)
【分类号】：TV223

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