岩体质量分级的风险分析方法

A RISK ANALYSIS METHOD IN ROCK MASS QUALITY CLASSIFICATION

提出了基于RMR岩体质量分级系统的岩体质量研究风险分析方法。该方法分析步骤如下 :(1)通过岩芯样品的现场观测和实验室试验获得分类所需的变量 ;(2 )统计分析拟合得出各变量的分布函数及参数 ;(3)运用Monte Carlo模拟方法获得 2万个RMR值 ,并将结果绘成岩体质量描述图 ;(4)利用以上结果作出岩体质量风险分析评价。

A risk analysis method based on Bieniawski's RMR system was proposed. Firstly, variables which were acquired for the RMR classification system were obtained from field and laboratory investigation of the core samples . Secondly, distribution functions and parameters of all variables are determined using statistic method. Thirdly, 20000 RMR values have been obtained utilizing Monte Carlo method and the results are plotted . Finally, risk analysis can be made from above results. This method acquire good results in applied to the research on quality of rock masses in Runyang Yangze River Highway Bridge Project .