测量统计范围大小对结构面迹长估计的影响

EFFECTS OF MEASUREMENT RANGE ON ESTIMATION OF TRACE LENGTH OF DISCONTINUITIES

基于计算机模拟裂隙网络和典型露头实测结果 2种数据,对比研究测量范围大小对迹长估值的影响。通过对比研究揭示测量范围大小对不同估值公式可靠性的影响,研究允许最小测量范围及其影响因素,发现窗口过大时有些计算公式也会出现明显偏差,并分析计算机模拟技术在该问题研究上的局限性。研究表明,对结构面迹长估值,首先应研究测量范围的适宜性及其对所采用估值方法的影响,否则,即便采用目前复杂的计算公式仍可能存在较大的取样偏差,为后续的结构面建模埋下隐患。另外,针对我国高放废物地质处置预选场地的典型露头进行的测量范围适宜性分析,也可为其接下去的结构面参数识别打下基础。

The extent of measurement range has a significant influence on estimation of trace length of discontinuity.However,measurement range is not considered in some of the current calculation formulas,though this parameter contained in some of the formulas,whether this influence could be showed in different measurement ranges still remain farther test and verify.So this paper attempts to make a comparative study on the basis of two types of data,one is created from Monte Carlo simulation,another is measured on a real outcrop.The influences of measurement range on the estimation of trace length by different formulas,the permitted minimum measurement range and its factors have been studied in this paper.The results indicate that some formulas may also contain notable errors when the sampling window is too large.Therefore,for the evaluation of the trace length of discontinuity,it should begin with the analysis of suitability and influence of measurement range;otherwise the sampling deviation would be still unquenchable even if complicated formulas are adopted.The edge effect and limitation of Monte Carlo simulation method for this issue have been found during this study.Also the suitability analysis in typical outcrops of candidate area for the geological disposal of high-level radioactive waste in China is made,which is helpful for the subsequent discontinuity investigation.