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为进一步准确预测隧道V型浅埋段的地质情况,防止塌方、冒顶等事故的发生。需要对其掌子面进行超前地质预报.在隧道V型浅埋段超前地质预报中,首先对其地质模型进行分类,分析不同地质模型中能量的吸收、衰减规律,以及反射、透射等弹性波的传播规律;然后再对实际采集的TSP数据进行分析处理。提取主要强能量的反射界面,通过对该界面位置及属性的分析,定性确定其地质类型;最后结合TSP反演成果中的重要参数,对其地质情况进行详细的分析.该超前地质预报方法在拉日铁路桌隧道V型浅埋段的应用中,其预测边界与实际开挖误差仅3 m.该分析思路值得在今后的超前地质预报工作中进一步的推广和更深入的研究.
In order to further accurately predict the geological conditions of the tunnel V-shaped shallow buried sections and prevent the occurrence of landslides and roof fall accidents. It is necessary to carry out advanced geological forecasting on the face of its face.In the advanced geological prediction of V-shaped shallow section of tunnel, its geological models are firstly classified and the energy absorption and attenuation laws of different geological models are analyzed, and elastic waves such as reflection and transmission Of the propagation laws; and then the actual acquisition of TSP data analysis and processing. The reflection interface of the main strong energy is extracted, and the geological type is determined qualitatively by analyzing the location and properties of the interface. Finally, according to the important parameters in the TSP inversion results, the geological conditions are analyzed in detail. In the application of the V-Shallow Depth Section of the Lari Railway Tunnel, the predicted boundary and actual excavation error is only 3 m, which is worthy of further promotion and further study in the future advance geological prediction.