Application of TSP Combined with TEM in Advanced Geological Prediction of Risk Surrounding Rock Tunnel
In order to identify potential geological risks during tunnel construction and guide the safe tunnel excavation,advanced geological prediction was carried out by using the combination of TSP and TEM methods for the shallow buried and the soluble rock sections in risk surrounding rock tunnel of a high-speed railway.TSP can provide long-term macroscopic prediction of the surrounding rock conditions in front of the tunnel face,and can delineate the location and approximate scale of unfavorable geological bodies such as faults,fractured zones,and groundwater.TEM can conduct multi-angle and multi-directional measurements near the excavation face,thereby determining the characteristics of unfavorable surrounding rock,especially the distribution and scale of groundwater and karst,within a certain spatial range in front of the excavation face.Through comprehensive comparison and analysis of TSP and TEM detection results,the joint prediction conclusions were drawn which correspond well with the actual excavation of the tunnel.Application research shows that,TSP combined with TEM can effectively detect bad geological bodies such as fracture zone,groundwater,and karst.The negative reflection and low-speed anomaly corresponding to the TSP seismic wave map highlight the changes in rock lithology and the degree of rock fragmentation.Based on the characteristics of vertical and horizontal wave velocity fluctuations,the development of groundwater can be roughly determined.The low resistivity anomaly of TEM intuitively reflects the groundwater state of the surrounding rock,and can speculate on the development and distribution of karst.The area with dense changes in apparent resistivity corresponds to the fragmentation of the surrounding rock.In engineering applications,combining two or more methods to carry out comprehensive forecasting can improve the accuracy and reliability of predicting conclusions.The application examples of TSP combined with TEM successful prediction can provide reference and comparison for advanced geological prediction of similar risk surrounding rock tunnel.
high-speed railwayrisk surrounding rock tunnelshallow buried sectionsoluble rock sectionTSPTEMadvanced geological prediction
万方数据
维普
