基于模糊概率理论岩质围岩基本分级细化研究
Rocky surrounding sub-classification based on fuzzy mathematics and probability method

以青岛地铁岩质围岩为研究对象，制订以定性鉴别、BQ、岩芯状态和围岩弹性纵波速度为基础的岩质围岩基本分级细化方法，并将模糊概率理论引入围岩分级中。研究结果表明：对Ⅲ和Ⅳ级围岩进行亚级划分，岩质围岩等级由原来的5级增加到7级，降低了围岩质量之间的跨度，并给出各级围岩的物理力学参数；在定性鉴别的基础上，得到BQ、岩芯状态、围岩弹性纵波速度与围岩等级之间的对应关系，进而建立以定性鉴别、BQ、岩芯状态和围岩弹性纵波速度为基础的岩质围岩基本分级细化方法；获得不同围岩分级方式的判别精度以及围岩等级与各分级指标的隶属函数，以此为基础引入模糊概率理论，建立围岩分级的模糊综合评定方法；通过现场的应用得出，该方法能降低围岩分级中的主观因素，提高围岩分级的精确度，丰富围岩分级体系。
In this paper, the basic classification method of rock mass based on the qualitative discrimination, BQ, core state and elastic longitudinal compressional velocity of surrounding rocks is developed. And the fuzzy probability theory is introduced into the classification of surrounding rocks. Taking the rock mass of Qingdao subway as the research object, the following results are obtained: The Grade Ⅲ and Ⅳ rocks were divided into sub-grades, and the grades of surrounding rock were increased from five to seven, which reduced the mass span between rock masses. It also gives the physical and mechanical parameters of surrounding rock at all levels .On the basis of qualitative identification, the correspondence between BQ, core state, elastic compressional wave velocity of surrounding rock and grade of surrounding rock is obtained. Then the basic classification method of rock mass is established. The discrimination accuracy of surrounding rock classification method and the subordinate function of surrounding rock grade and each grade index are obtained. Based on the fuzzy probability theory, the fuzzy comprehensive evaluation method of surrounding rock classification is established. Through on-site application, it verified that this method reduces the subjective factors in the classification of surrounding rock, improves the accuracy of surrounding rock classification and enriches the grading system of surrounding rock