A NEW PEAK SHEAR STRENGTH FORMULA FOR MATCHING IRREGULAR JOINTS BASED ON 3D MORPHOLOGY PARAMETERS
XIA Caichu1，2，3，TANG Zhicheng2，3，SONG Yinglong2，3
(1. School of Civil Engineering，China Three Gorges University，Yichang，Hubei 443002；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China)
Abstract：Joint surface morphology is one of the most important factors for peak shear strength of jointed rock. Artificial joints are used for direct shear tests under five levels of normal stresses，i. e. 0.5，1.0，1.5，2.0，3.0 MPa，to study the relationship between 3D morphology parameters and peak shear strength. Effective joint surface 3D mean angle ，surface roughness coefficient and the maximum possible contact area ratio are selected to describe the joint roughness. Scanning joint surface after each direct shear tests by TJXW–3D topography scanner and the above selective morphology parameters are calculated. A new peak shear dilation angle model is proposed with relationship to 3D morphology parameters of ， ， . Then，a new strength criterion with three morphology parameters is suggested for modeling the peak shear strength of rock joints. A comparison between the proposed models and the experimental results show a relatively good agreement. At last，the calculated results by the new criterion is compared to the well-known Barton?s criterion. It is shown that Barton?s criterion underestimates the observed peak strength.
夏才初1，2，3，唐志成2，3，宋英龙2，3. 基于三维形貌参数的偶合节理峰值抗剪强度公式[J]. 岩石力学与工程学报, 2013, 32(s1): 2833-2839.
XIA Caichu1，2，3，TANG Zhicheng2，3，SONG Yinglong2，3. A NEW PEAK SHEAR STRENGTH FORMULA FOR MATCHING IRREGULAR JOINTS BASED ON 3D MORPHOLOGY PARAMETERS. , 2013, 32(s1): 2833-2839.
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2013, Vol. 32 
