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GPR Forward Simulation of Filled Karst Caves in Advance Geological Prediction for Tunnels
(1 Karst Dynamics Laboratory, MLR & GZAR, Institute of Karst Geology, CAGS, Guilin 541004;
2 China Railway Southwest Research Institute Co. Ltd., Chengdu 611731)
Abstract Unfavorable geologic bodies such as karst caves often turn up during tunneling. Based on different fillers, karst caves are classified into four types: air-filled, water-filled, silt-filled, or grit-filled. Applying the principles of the finite difference time domain method (FDTD), a forward simulation for common karst diseases was performed, and the results of the theoretical simulation were verified using project cases. The results show that the essential feature of forward simulated images of karst caves is a hyperbolic event. From the kinematics and dynamical characteristics of the hyperbolic event, we can infer the geometric position of karst caves and qualitatively determine what their fillers are. The simulated results are in agreement with the measured ones.
Abstract：
Unfavorable geologic bodies such as karst caves often turn up during tunneling. Based on different fillers, karst caves are classified into four types: air-filled, water-filled, silt-filled, or grit-filled. Applying the principles of the finite difference time domain method (FDTD), a forward simulation for common karst diseases was performed, and the results of the theoretical simulation were verified using project cases. The results show that the essential feature of forward simulated images of karst caves is a hyperbolic event. From the kinematics and dynamical characteristics of the hyperbolic event, we can infer the geometric position of karst caves and qualitatively determine what their fillers are. The simulated results are in agreement with the measured ones.
LIU ,
WEI 1,
Zhou etc
.GPR Forward Simulation of Filled Karst Caves in Advance Geological Prediction for Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(1): 153-158
2014, Vol. 51 