滇中红层软岩大变形预测分级研究——以滇中引水工程大转弯隧洞为例

Study on Large Deformation Prediction Classification of Red-Bed Soft Rock in Central Yunnan——Taking the Large Turning Tunnel of Water Diversion Project in Central Yunnan as an Example

【目的】为探究滇中红层隧洞软岩大变形规律,以滇中引水工程楚雄段隧洞为例,进行预测分级研究。【方法】采用三维计算模型对隧洞初始地应力进行分析,结合工程实际对各典型断面进行计算,并系统性地分析隧洞各典型断面最大位移量和工程地质情况及[BQ]值之间的关系。【结果】滇中红层软岩大变形主要受工程地质影响,通过[BQ]值和最大位移量可以对滇中红层隧洞软岩大变形等级进行分级预测。【结论】本研究为判别隧洞软岩大变形情况提供了技术支撑,并为大变形分级提供了重要依据。

[Purposes]In order to explore the large deformation law of soft rock in red bed tunnel in central Yunnan,the prediction and classification research is carried out based on the Chuxiong section tunnel of central Yunnan water diversion project.[Methods]The three-dimensional calculation model was used to analyze the initial geostress of the tunnel,and the typical sections were calculated according to the engineering practice.Secondly,the relationship between the maximum displacement of each typical section of the tunnel and the engineering geological conditions and[BQ]values is systematically analyzed.[Findings]The large deformation of red-bed soft rock in central Yunnan is mainly affected by engineering geology.The large deformation grade of soft rock in red-bed tunnel in central Yunnan can be predicted by[BQ]value and maximum displacement.[Conclusions]This study provides technical support for judging the large deformation of tunnel soft rock and provides an important basis for large deformation classification.