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公路隧道围岩的分类方法较多,每一种分类方法的结果都是对真实围岩状况的一种估计,通过一定的算法将这些分类结果进行合成,可以使各分类法取长补短,围岩信息得到充分利用。基于上述思路,并考虑到分类标准和被分类隧道围岩物理力学指标均为区间数的实际情况,提出了一种基于区间数的公路隧道围岩组合分类法。为充分利用区间数携带的信息,定义了一种新的区间数距离计算方法,选择能够兼顾各单一分类法之间功能性和协调性要求的加乘混合函数作为围岩分类函数,计算被分类围岩与分类标准各级别之间的分类函数值,最小值对应的类别即为被分类围岩的类别。针对某工程隧道2个典型段围岩的分类问题,在隧道围岩常用的岩芯质量指标ROD法、《公路隧道设计规范》(JTGD70-2004)BQ值法和弹性波速vp法进行分类的基础上,采用本文方法进行组合分类,结果表明:本文方法物理意义明确,计算过程简捷,分类指标稳定,分类结果与单一分类法相比能够更好地反映实际围岩状况,可供公路隧道勘察、设计、施工时参考。
There are many classification methods for the surrounding rock of highway tunnels. The result of each classification method is an estimate of the actual condition of the surrounding rock. By synthesizing these classification results by a certain algorithm, each classification method can make up for each other’s strengths and weaknesses, Be fully utilized. Based on the above thought, taking into account the classification criteria and the physical and mechanical indexes of the classified tunnel surrounding rock are the actual number of intervals, a combination of surrounding rock classification method based on interval number is proposed. In order to make full use of the information carried by the interval number, a new interval number distance calculation method is defined. The additive mixed multiplication function that takes into account the functional and coordination requirements of each single classification method is selected as the surrounding rock classification function, Surrounding rock and classification criteria between the various levels of classification function values, the minimum corresponds to the category that is classified rock category. Aiming at the classification of surrounding rock of two typical sections of an engineering tunnel, based on the core mass index ROD method, BQ value method and elastic wave velocity vp method commonly used in tunnel surrounding rock The results show that the proposed method has a clear physical meaning, a simple calculation procedure and a stable classification index. Compared with the single classification method, the classification results can better reflect the actual conditions of surrounding rock and can be used for highway tunnel investigation and design , Construction reference.