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岩体统计均质区的划分是岩体工程设计的首要步骤,因为不同的均质区内岩体的结构特性和力学特性都存在差异。大多研究考虑产状或者其他单一参数划分岩体统计均质区,却很少有人考虑多参数进行划分研究。考虑了裂隙产状、迹长两个参数,提出了一种划分裂隙岩体统计均质区的新方法,即基于秩和检验评价两个样本之间的相似性,从而实现对裂隙岩体统计均质区的划分。结合工程实例即云南省马吉水电站左岸坝肩某两高程4个平硐的岩体结构统计均质区划分,分析了多参数对裂隙岩体统计均质区划分的影响。研究结果表明:PD241和PD253、PD201和PD241分别划分为一个统计均质区,而PD201和PD251以及PD251和PD253不具有统计相似性。考虑了产状和迹长因素对岩体统计均质区的影响,划分结果较Miller方法更加合理可靠。结合现场调查分析,新方法的结果更加吻合实际情况。
The division of rock mass statistical homogeneity zone is the first step in the design of rock mass engineering, because there are differences in the structural and mechanical characteristics of rock mass in different homogeneous regions. Most studies consider the occurrence or other single parameters to divide the statistical homogenization area of rock mass, but few people consider the multi-parameter division study. Considering the fissure yield and trace length parameters, a new method of dividing the statistical homogeneity zone of fractured rock mass is proposed, that is, the similarity between the two samples is evaluated based on the rank sum test, so as to realize the statistics of fractured rock mass Homogenization division. Combined with the engineering example, the statistic homogenization zone of rock mass of four adit of two abutment on the left bank abutment of the left bank of Magee Hydropower Station in Yunnan Province, the influence of multi-parameters on the division of statistical homogenization zone of fractured rock mass is analyzed. The results showed that: PD241 and PD253, PD201 and PD241 were divided into a statistical homogeneous area, and PD201 and PD251 and PD251 and PD253 do not have statistical similarity. The effect of formation and trace length on the statistical homogenization zone of rock mass is considered, and the classification results are more reasonable and reliable than Miller's method. Combined with field investigation and analysis, the results of the new method are more in line with the actual situation.