Optimisation d'une source vibratoire pour la détection des cavités souterraines par sismique réflexion haute résolution

Abstract : The main objective of this thesis is to develop and optimize the acquisition tools for High Resolution Reflection Seismic (HRS) technique in order to improve its performances in the detection of underground cavities. It is commonly admitted that HRS imaging becomes more complicated with when the depth of interest is decreased. The work carried out in the frame of this thesis aims to bring solutions to some of the most critical problems identified in application of the HRS.The vibratory sources show undeniable advantages (non destructivity, controllable output signal) over "classic" (impulsive, destructive) sources. However, the optimal use of these sources depends on the proper choice of emitted signal.Thus, the research work carried out resulted in (1) development of a complete, computer-based vibrator control system allowing piloting small vibratory source intended to use for HRS surveys, (2) development of a method for generating the source signal. The proposed procedure links the entry signal with seismic image and thus allows the choice of the signal in terrain conditions and with regard to the measurement goals, (3) extensive testing of the developed system with several portable vibratory sources.The developed system was tested and validated in small-scale tests. Afterwards it was used in real conditions with the goal of "cavity detection" in salt-mining context (old salt mines in Lorraine region at depths between 160 m and 180 m) as well as in chalk-mining area (ancient marl-pit quarries in the Normandy region at depths 15 m - 45 m)
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Engineering Sciences. Ecole Centrale de Lille, 2009. French. <NNT : 2009ECLI0019>


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Arkadiusz Kosecki. Optimisation d'une source vibratoire pour la détection des cavités souterraines par sismique réflexion haute résolution. Engineering Sciences. Ecole Centrale de Lille, 2009. French. <NNT : 2009ECLI0019>. <tel-00579842>

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