隧道围岩分类的层次类比系统方法

Hierachical analogy system metlmd for the classifiction of surrounding rocks of tunnel

在本文中,把围岩分类的因素分为3种。第一种为大的地质环境,它主要包括地层、构造、地形等;第二种为围岩的小环境,它包括岩体结构、结构面的发育情况、地下水的分布等;第三种为围岩的物理、力学、水理以及埋深等具体参数。这3种因素从大到小形成一个层次递阶关系,下层元素是上层元素的具体表现,上层元素对下层元素产生影响。把用这种层次关系表征的典型工点集合,作为一个工程地质评价模型的基础。按典型工点的稳定性进行排序或进行聚类分析,再把新工点的稳定性权重与典型工点的稳定性权重序列或相似序列比较,找出新工点在典型工点序列中的相当位置,这样就可根据与新工点相近的典型工点围岩类别以及施工、支护等成功的设计参数或经验教训作为新工点的设计参数。

In this paper, the factors for rock mass classification are divided into three levels. The first level is the grand geological environment, consisting manily of the stratigraphy, geological structure, and topography. The second level is the immediate rock mass surrondings, consisting of the rock mass structure, development of structural planes, ground water distribution ete. The last level consists of the concrete parameters, such as the physical dynamical and hydrological burial dopth,ete. These factors make up a hierarchical relationship, in which those of the higher levels exert control on the lower ones, while the lower ones serve as the concrecte manifestation of the higher. In the form of the data stucture, the rock mass parameters are kept into a data base as the evaluating set. Odering or clustering to the model data, the system give a evaluation resutt by analogy for a newrock tunnel.