考虑相关性的铁路隧道围岩概率分级方法研究

Study on Correlativity-based Probability Grading Method for Surrounding Rock of Railway Tunnel

研究目的:以现行《铁路隧道设计规范》(TB10003—2005)围岩分级方法为基础,将概率分析原理引入铁路隧道围岩分级工作中,并对分级指标相关性进行研究,建立考虑围岩分级指标相关性的、定量分析铁路隧道围岩等级的概率模型,为铁路隧道勘察、设计及施工提供参考。研究结论:通过采用考虑相关性的铁路隧道围岩概率分级模型对石太客运专线南梁隧道、太行山隧道部分里程的围岩进行分级计算,并将计算结果与围岩实际开挖情况对比;结果表明,考虑相关性的铁路隧道围岩概率分级方法预测结果与实际开挖情况吻合,比较客观地反映了隧道围岩实际情况,是铁路隧道围岩分级的一种有效方法。

Research purposes： Based on the grading method for the surrounding rock of railway tunnel stipulated in the Design Code for Railway Tunnel,the principle of probability is used in grading the surrounding rock of railway tunnel,the study is done on the correlativity of grading indexes and the probability model is established for grading surrounding rock of railway tunnel with correlativity-based quantitative analysis for providing the reference to survey,design and construction of railway tunnel.Research conclusions：The correlativity-based probability grading method was used for grading calculation of the surrounding rock of Nanliangshan Tunnel and Taihangshan Tunnel of Shijiazhuang-Taiyuan Passenger Dedicated Line and the calculation results fit to the real situation of the surrounding rock of the tunnels after comparing it with the real surrounding rock.It shows the real situation of the surrounding rock can be reflected with this method and this method is an effective way of grading the surrounding rock of railway tunnel.