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Abstract Development of model similitude material for geophysical fields is the key to the success of geophysical detection model test. According to the similar problem of the seismic wave field，electromagnetic field and the direct current field，a comprehensive model similitude material for multiple geophysical fields is developed by multiple geophysical fields similarity theorem and orthogonal experiment. It is composed of silty clay，gravel and cement. Silty clay and gravel are used as aggregated，and cement is used as the cementing agent. The velocity range of this material is about 236～1 260 m/s and the resistivity range is about 27.2～342.8 Ω•m. The influent factors order of specimens wave velocity is compactness，moisture content，cement/clay and gravel/clay，that of specimen resistivity is moisture content，compactness，gravel/clay，cement/clay according to the results of the orthogonal experiment. And the compactness and moisture content is the two prominent influence factors for velocity and resistivity of the comprehensive similitude material. Finally，a large scale physical model packing test of multiple geophysical fields is conducted，and the similitude material proportioning for the concrete model test is obtained. Strong reflection interface of TRT(tunnel reflection tomography) offset and low resistivity anomaly of inversion image are obtained. The response characteristics in model test are similar to response characteristics in field. The detection result is consistent with actual location in model test，which indicates that the similitude material could meet comprehensive model test for the multiple geophysical fields.
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2015, Vol. 34 
