基于二维马尔可夫链的武汉长江公铁隧道地层识别

Stratigraphic Identification of Wuhan Yangtze River Railway Tunnel Based on Two-dimensional Markov Chain

地层变异性广泛存在于实际工程中,常常表现为工程面临复杂的地层环境,且地质钻孔数据受各方面因素限制往往十分有限,无法获取更多的地质资料,然而基于有限钻孔资料进行地层识别研究还不完善。因此,本文采用二维马尔可夫链模拟方法,以武汉长江公铁隧道武昌岸右线部分钻孔资料为例,进行了有效的地层识别并验证了该方法的可靠性。结果显示:该方法考虑了地层变异性对地层识别的影响,能基于有限钻孔资料进行相应的地层识别,并较简单线性插值法的误差率有所降低。研究结果可为实际工程提供较为准确的地层识别结果,特别是可为弥补地质勘查孔位不足提供较为详细的工程地质资料。

Stratigraphic variability widely exists in practical engineering.Usually,a project is faced with complex stratigraphic environment,and the geological borehole data is often limited by various factors.So,more geological data can’t be obtained.The stratigraphic identification research based on the limited borehole data is not perfect.Therefore,the two-dimensional Markov chain simulation method is adopted in this paper,and the borehole data of the right line of Wuchang bank of Wuhan Yangtze River railway tunnel is taken as an example to carry out effective stratigraphic identification and to verify the reliability of this method.The results show that the method takes into account the effect of stratigraphic variability on stratigraphic identification,complete the corresponding stratigraphic identification based on limited borehole data,and has a lower error rate than simple linear interpolation.The research can provide more accurate stratigraphic identification results for practical engineering and more detailed engineering geological data especially for the shortage of geological exploration hole.