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基于数理统计响应面分析法中的二次回归通用旋转法,将粘聚力与内摩擦角作为铁路隧道软弱围岩的研究指标;以重晶石、石英砂和凡士林等混合物作为铁路隧道软弱围岩的相似材料,通过应力控制式三轴试验仪进行常规三轴试验;利用非线性回归分析的方法对实验结果进行分析,分别得出相似材料配比与围岩粘聚力及内摩擦角的变化规律。综合考虑粘聚力与内摩擦角两个指标之后,最终得出与模型试验所需围岩条件相匹配的相似材料的重晶石、石英砂与凡士林的最佳配比为9.25∶4.56∶0.67。
Based on the quadratic regression general rotation method in mathematical statistics and response surface analysis, cohesion and internal friction angle are taken as the research indexes of the soft surrounding rock in the railway tunnel. The mixture of barite, quartz sand and Vaseline is used as the weak boundary of the railway tunnel Similar materials of rock were tested by stress-controlled three-axis tester for the conventional triaxial tests. The nonlinear regression analysis was used to analyze the experimental results to obtain the similar material ratio and cohesion of surrounding rock and internal friction angle The law of change. Considering cohesion and internal friction angle, the best barite with the similar materials for the model test is obtained. The optimal ratio of quartz sand to Vaseline is 9.25: 4.56: 0.67 .