摘要
当假定结构面形状为圆盘时,直径成为岩体结构面空间分布的重要参数,需由实测迹长推求。提出直径新试算法,以Monte Carlo法模拟结构面几何要素分布、解析几何学推导分布关系、Excel或C++等编程试算直径分布使试验逼近实测未删截半迹长分布,此时试算直径分布为最佳直径分布。由于结果具有离散性,进行降低离散性试验,发现多次试算取平均值能有效降低离散性。新试算法较Priest-Zhang算法更准确、容错能力更强、计算速度更快、硬件配置更低、文件和内存占用量更小、编程更简便、运行更稳定,且较Priest-Zhang算法、黄磊前期算法适用分布形式更广。新试算法填补了在半迹长测线法中能够适用于多种分布形式的直径准确算法鲜见的空白,在汶川地震区得到成功验证,值得推广。
The discontinuity in rock mass is assumed as a disc, and the diameter becomes an important parameter of its spatial distribution. The diameter can be deduced from the observed trace length. A new trial algorithm for diameter was proposed, which simulated discontinuity distribution with Monte Carlo method, deduced distribution relation with analytic geometry and programmed with Excel or C＋＋. The best diameter distribution from the algorithm was that making the trial untruncated-uncensored semi-trace length approximate to the observed one. Experiments to reduce the discreteness of the algorithm result were conducted. It is shown that taking mean value of many trials can reduce the discreteness effectively. The new trial algorithm is more accurate, better in fault tolerance, faster in calculation, lower in hardware configuration, less in file size and memory occupancy, more convenient in programming and more stable in running than Priest-Zhang algorithm. Also it suits more distribution patterns than Priest-Zhang algorithm and Huang Lei＇s previous one. The new trial algorithm supplies the gap in the accurate algorithms for universal distribution patterns in semi-trace line-sampling, which has been tested in Wenchuan earthquake area and is worth popularizing.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第1期140-153,共14页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展计划(973)项目(2011CB710600)
汶川地震区岩体稳定性评价技术方法资助项目(G091914)
关键词
岩石力学
汶川地震
半迹长测线法
未删截半迹长分布
直径新试算法
MONTE
Carlo法
解析几何学
rock mechanics
Wenchuan earthquake
semi-trace line-sampling
untruncated-uncensored semi-trace length distribution
new trial algorithm for diameter
Monte Carlo method
analytic geometry
作者简介
黄磊（1986－），男，2008年毕业于中国地质大学（武汉）岩土工程与工程地质系岩土工程专业，现为博士研究生，主要从事岩体结构方面的研究工作。E-mail：278908378@qq．com
