Reconnaissance du sous-sol par méthodes géophysiques appliquées à la détection des cavités souterraines

Abstract : This document presents a report on research work carried out in the frame work of a large program entitled « Geophysical detection of underground cavities ». The principal objective is to develop tools and procedures to enhance the performance and the resolution of the geophysical imaging. The step that consists in developing technical tools and to improve scientific knowledge in the field of underground sounding applied to the cavities detection and diagnostic is upstream process of risk management. To achieve these goals, the program was elaborated on the basis of partnership research implying scientists and industrial able to associate knowledge, experience, the know-how and the expertise. A large aspect of the work carried out concerns the design and development of acquisition tools to increase the performance of the high-resolution seismic reflection, in particular, to optimise the resolution of the sub-surface imaging. Vibratory sources in P and S waves, a procedure of generation and optimisation of Sweep were developed and validated. Powerful and operational seismic acquisition package is, from now on, available for underground auscultation applied to cavities detection. In addition to SHR (Seismic High Resolution), the geophysical techniques based on the microgravity and electrical resistance measurements were investigated in salt context of Lorraine region (East France) and the marl-pits of Haute-Normandie (North France). It arises from the experiments on pilot sites a satisfactory detection of cavities in the studied contexts thanks to the new developments of HRS acquisition System. In addition, the investigation of the three selected geophysical techniques raised the interest of joint measurements of the high-resolution seismic and the microgravity in particular in the context of the marl-pits. The following report presents the works on the SHR developments, the evidential results of the field experiments carried out in the salt basin of Lorraine and marl-pits of Haute-Normandie as well as an experience feedback of the undertaken research.
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Lynda Driad-Lebeau, Arkadiusz Kosecki. Reconnaissance du sous-sol par méthodes géophysiques appliquées à la détection des cavités souterraines. Rapport Scientifique INERIS, 2008, 2007-2008, pp.105-108. ⟨ineris-01869209⟩

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