岩体结构面三维粗糙度系数表征新方法

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Abstract Joint roughness coefficient(JRC) has influence on the deformation，failure and seepage properties of rock mass discontinuities；and the measurement and estimation of JRC are always focal，but difficult problems in the field of rock mechanics. The majority of the current research methods which have been based on the analysis of two-dimensional(2D) profiles rather than three-dimensional(3D) surface topography lead to erroneous results. On the other hand，the existing 3D evaluation methods only depend on the geometry data，but the anisotropy properties of JRC are ignored. Therefore，a new representation method for 3D JRC based on the brightness area percentage(BAP) was proposed. Firstly，with the help of laser scanning technique，the 3D digital model of rock fracture surfaces was established. Secondly，a light source was simulated；and there would be some brightness and shadows produced on the model surface. In addition，the simulated results were saved as picture format. Thirdly，in order to obtain the value of BAP of each specimen，the image recognition technique was introduced and the brightness area in the picture was identified. Lastly，combination with the results from formula proposed by R. Tse and D. M. Cruden and taking the direction of shear or seepage into account，an empirical formula was found between BAP and 3D joint roughness coefficient(JRC3D). Taking the data of Yujian River Reservoir project for example，the experimental results show that：(1) In the case of equal light source angle，generally，JRC3D are positive proportional to BAP. (2) A comparative analysis of results from different incidence angles was performed；after an extended evaluation，35°–70° was chosen as the most appropriate incidence angle. (3) The evaluation formula for relationship between BAP and JRC3D based on the engineering data of Yujian River Reservoir was derived. The predictions(17.20，17.40，17.17) of JRC3D made with this equation agreed well with the results(16.47，16.81，16.69) obtained in equation proposed by R. Tse and D. M. Cruden.

Key words： rock mechanics rock mass discontinuities joint roughness coefficient(JRC) three-dimensional laser scanning technique image recognition technique

Received: 28 April 2012

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