黏质土隧道围岩分级指标的选取研究

以长序列黏质土围岩物理力学指标及埋深数据为基础，运用数理统计学原理和灰色关联度理论从定量的角度分析了黏质土围岩分级的指标选取。研究结果表明：选用力学指标的影响因素作为分级的基本指标是可行的；黏质土围岩分级预选物性指标可分为3组，根据综合分组分析和关联度分析，确定了各组内指标的综合相关系数，综合相关系数大小表明液性指数、天然密度及塑性指数的变化对黏聚力和内摩擦角参数有很大的影响，据此确定黏质土隧道围岩的分级指标为液性指数、天然密度和塑性指数。

Stduy on index selection of surrounding rock classification for cohesive soil tunnel

Taking a long sequence test data of physics and mechanics of cohesive surrounding rock as a base, the indices selection of surrounding rock classification was analyzed in a quantitative angle through mathematical statistics theory and grey-relation method. The research results show that the influential factors of mechanical indices are feasible to be basic classification indices. All preelection indices can be divided into three groups. On the ground of the results of grouping analysis and relation degree degree analysis, integration correlation coefficient of indices were calculated. Plastic index, natural density and liquid index have an important influence on cohesion and inner friction angle based on the value of integration correlation coefficient. The analysis results reveal liquid index, natural density and plastic index are the estimation indices of surrounding rock classification in cohensive soil tunnel.