Electrical-Geological Parameters Of The Adverse Geological Zone In Front Of Working Face In Tunnel And Sensitivity Analysis

With the construction of high speed railway, highway and submarine tunnel, geologic disaster always plays the main part of influencing construction and operation safe of tunnel and underground engineering, among this geologic disaster, underground water is one of the main factors, for example, karst cave, underground river, karst sink hole, karst muddy belts, water-saturated fracture zone and so on, all this can bring on difficulty and harm to construction and operation of tunnel and underground engineering. By all appearance, tunnel geological hazard forecasting plays an important part in avoiding these geological hazards. Presently, there are many method used in the field of tunnel geological hazard forecasting and these methods have their own advantage each other. But there is an unsolved problem in the exploration of unfavorable geologic in the advanced forecast of geology in tunnel filled with water in the advanced forecast of geology in tunnel.Transient Electromagnetic method (TEM) is a new method used to forecast the unfavorable geologic filled with water or mud. The new method is sensitive to the unfavorable low resistively geologic bodies filled with water or mud such as faults, caves, zones of rock fracture and water-saturated fracture zone. This thesis adopts the finite element software ANSYS to analyze transient electromagnetic method Geological Prediction. In-depth study is carried on two forms of low resistively adverse geology from the impact of the transient electromagnetic abnormal response. Influencing factors of the geological anomaly response and the law of the abnormal response changing with the factor were studied. The transient electromagnetic response of multi-factor and the sensitivity of the factors were studied using the numerical Methods.