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Numerical Simulation for Tunnel Geological Hazard Detection by Reflected Wave Method and Rock Dynamic Classification by F-AHP Method Research

Author: LuGuangYin
Tutor: ZhuZiQiang
School: Central South University
Course: Safety Information Engineering
Keywords: Tunnel geological disasters Reflected wave detection Forward modeling Reverse Time Migration Surrounding rock mass dynamic classification
CLC: P631.4
Type: PhD thesis
Year: 2009
Downloads: 430
Quote: 9
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Abstract


Tunnel project as a hidden project, when the unknown geological conditions in Front of Face, can easily cause landslides, cave-, of Mud Outburst sudden geological disasters, not only affect the construction schedule, and also can easily result in equipment buried, personnel mourning the dead and other major accidents, causing heavy losses to the national economy and people's lives and property. Advanced detection is the basis of the prediction and prevention of geological disasters of the tunnel, and the surrounding rock classification is the basis of tunnel geological disasters Stability Evaluation and Treatment program development. However, the detection of the reflected wave method of tunnel geological disasters due to seismic wave field is unusually complex and overlapping, difficult to effectively identify and separation, unable to meet the the tunnel leading exploration of high-precision and high-resolution requirements; addition, the tunnel adverse geological disasters body disposal, the traditional classification of rock masses determine the system due to the lack of effective, reasonable level of surrounding rock, can not accurately evaluate and guide the construction of the tunnel surrounding rock stability, it is difficult to meet the tunnel geological disasters Treatment need. To solve these problems, the author of a number of provincial and ministerial research projects jointly funded the typical tunnel geological hazards model seismic wave field forward modeling, multi-wave and multi-component data migration imaging, and the tunnel wall rock dynamic F-AHP points level and other aspects of the study and exploration, mainly to carry out the following tasks: (1) in arbitrary even order time analysis of first-order velocity - stress elastic wave equation - space precision interlaced network differential format, and to explore the stability conditions and overcome numerical the basis of the frequency scattered method for tunnel reflection wave method ahead of detection of the detector observation system of detailed explore the tunnel seismic wave field are played to simulate the boundary conditions, system derivation of its boundary condition equations and staggered network differential calculation formats, and settings source function for the tunneling wave field forward modeling and programming foundation. (2) Visual C and MATLAB visualization program design language, the preparation of the tunnel wave field forward modeling program applicable to any complex medium model and applied to tunneling in fault, weak interlayer cave several typical geological disasters The forward computation model, to obtain a snapshot of the wave field at different times of the corresponding model and synthetic seismic records. Forward simulation results clearly reflect the primary wave, the reflected wave, transmission spread multiple kinematic and dynamic characteristics of the various types of seismic waves, summed up the the tunnel seismic wave propagation of field, to deepen understanding of the the tunnel wave field snapshot tunnel reflected wave inversion soundings to explain the basis of the theory and technology. (3) A detailed analysis of the the conventional tunneling wave field migration imaging algorithm using traditional scalar wave field approach, the tunnel complex wave field, it is difficult to complete separation of the migration imaging accuracy and low accuracy, can not meet the tunnel geological precise prediction of disaster based on the characteristics of multi-wave and multi-component data tunnel reflected wave leading exploration vector wave field approach, in a tunnel complex under the conditions of full wave equation reverse-time migration imaging, compared with the traditional tunnel wavefield migration method to adapt better to the tunnel concealed detection and inversion interpretation of geological disasters ahead. (4) According to the characteristics of the tunnel project of comprehensive utilization of geological and geophysical data, logging data, tunnel engineering data and seismic records, integrated approach to build the initial velocity model, and export full wave equation inverse delay Billiton the basis of the staggered the network differential calculation format strike inverse offset imaging conditions on the preparation of the program to achieve a tunnel wave field reverse time migration imaging algorithm applied to the several typical geological hazards model and tunnel engineering, to obtain a more accurate and clearer profile migration imaging, good geological effect is more conducive to the geological interpretation of the data of the advanced detection of the reflected wave of the tunnel. (5) the traditional tunnel surrounding rock classification method difficult to meet the tunnel geological disasters disposal of the introduction of the Analytic Hierarchy Process (AHP) to dynamically adjust the impact factor of the tunnel surrounding rock classification on the basis of need limitations proposed using fuzzy math theory to determine the impact factor fuzzy weight calculation method, the F-AHP classification of tunnel surrounding rock dynamic programming algorithm applied to the tunnel project. The engineering application results show that, compared with the traditional RMR grading and classification of tunnel surrounding rock dynamic F-AHP, to improve the accuracy of tunnel surrounding rock classification, provides a more accurate basis for tunnel geological disaster evaluation and disposal.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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