| Tunnel is an important trend in the future through the mountains, especially, since the western development, the demand of the engineering is increasing. The complicated Engineering Geology of the tunnel enhance the difficulty for detailed geological situation in the period of exploration and design stages, but using these means such as geological survey, comprehensive advanced geological prediction numerical simulation analysis, strengthen the construction of monitoring to avoid risks. The emergence of new Austrian method achieves major breakthrough in the tunnel construction technology, thus the tunnel construction into the dynamic process, then new Austrian method based on monitoring measurement develop to equal attention to monitoring measurement and geological forecast become the important guarantee for the information construction.Taking certain railway tunnel in southwest for research object, using geological forecast, numerical simulation analysis and site monitoring measurement, this paper further study on information construction for deep tunnel in water and weak stratum, the main content are as follows:(1) According to the deep tunnel in water and weak stratum in southwest, the process of comprehensive advanced geological forcast was drawed, the technology system of comprehensive advanced geological forcast was constructed and developing reserch on comprehensive advanced geological forcast. Through the comprehensive prediction of TSP203 plus, ground penetrating radar, infrared water detecting and advance borehole drilling, the dynamic classification for information construction on tunnel was got.(2) A three-dimensional numerical model of tunnel was established by large-sacle numerical simulation software ANSYS12.0, embedded into FLAC3 D for calculation on tunnel excavation under the model of seepage. The results show that, the evolution characteristics of surrounding rock nechanic, the law of displacement as well as distribution form of plastic zone were got though numerical simulation under two step method and three step method, which can guide the optimization for the tunnel excavation.(3) Using total station instrument for monitoring measurement of tunnel surrounding rock, and select several function regression analysis of monitoring data. Study shows that the result of regression analysis can predict the surrounding rock deformation for a certain railway tunnel in water and weak stratum in southwest.Through the study on information construction in deep tunnel in water and weak stratum, technical support on construction scheme optimization was provided and the safety of tunnel construction was guaranteed. The results have some reference value for similar tunnel construction. |
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