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针对目前水电站地下厂房工程中不同围岩分类方法存在评价结果不一致、围岩力学参数存在室内试验值与实际情况不吻合的现象,现推荐采用岩体精细化描述体系对围岩岩体结构进行定量化评价。将常用围岩分类方法(RMR、Q、RMi、GSI、BQ、HC)评价指标予以归纳分组,并通过各组内不同指标对比分析获得围岩分类方法中的基础评价指标。以大岗山水电站主厂房某区段为分析对象,采取现场岩体精细化地质素描与后期数据挖掘、拟合相结合方法,并依据评价指标间的关联关系,获得了基础、非基础评价指标的分布概型及对应参数,实现对该段围岩岩体精细化描述认知;基于精细化描述结果,应用Monte Carlo法生成符合各评价指标分布概型的大量随机数,而后参照各分类方法评价思路与评分流程,得到评价指标在各分类方法对应的大量随机评分值,通过归纳统计获得不同围岩分类方法评价结果的分布概型;基于各围岩分类方法评价结果与力学参数值之间的关联关系实现对力学参数概率特征分析。该分析方法与思路可为类似工程围岩质量及力学参数的精确确定提供一定借鉴,并可为实现围岩支护极限状态设计提供必要的原始参数支持。
In view of the inconsistent appraisal results of different surrounding rock classification methods in the underground powerhouse project of hydropower station, there is a phenomenon that the experimental values of the surrounding rock mechanical parameters are not consistent with the actual situation. It is recommended to use the detailed description system of rock mass to quantify the surrounding rock mass structure Evaluation. The evaluation indexes of common surrounding rock classification methods (RMR, Q, RMi, GSI, BQ, HC) are grouped into groups, and the basic evaluation indexes of the surrounding rock classification methods are obtained through comparative analysis of different indexes in each group. Taking a certain section of the main plant of Dagangshan Hydropower Station as the analysis object, a combination of on-site fine mapping of rock mass and subsequent data mining and fitting was adopted. Based on the correlation between evaluation indexes, basic and non-basic evaluation indexes Based on the detailed description, Monte Carlo method was used to generate a large number of random numbers that fit the distribution of each evaluation index. Then, referring to the classification methods Evaluation ideas and scoring process, a large number of random scoring values corresponding to the evaluation indexes in each classification method are obtained, and distributional profiles of evaluation results of different surrounding rock classification methods are obtained through induction statistics. Based on the evaluation results of each surrounding rock classification method and the mechanical parameter values Of the relationship between the realization of the mechanical parameters of the probability characteristics of analysis. The analysis methods and ideas can provide some reference for the accurate determination of surrounding rock mass and mechanical parameters of similar projects and provide the necessary support for the original parameters for the design of the limit state of surrounding rock support.