Abstract：Research purposes: In stability analysis of cut slope，the accurate determination of discontinuity shear strength is the base of the stability analysis and the design of retaining structure.
Research methods: Based on the research of Barton formula and combining with investigation on site s& laboratory test a new method to determine the roughness of discontinuity is put forward.
Research results: A parameter was introduced to determine the JCS which is an important parameter in Barton formula. Their mathematical relationship is fitted. The thickness of weak layer (flat layer) or filling degree (granulate layer) is introduced to determine the shear strength of weak rock layer.
Research Conclusions: Based on the correct determination of roughness, the estimated shear strength can be used to analyze the stability of slope. The method is easy, economic, fast, etc. and is more suitable in the field of highway & railway engineering.
封志军，赖紫辉. 边坡极限平衡分析中结构面抗剪强度的确定[J]. 铁道工程学报, 2006, 23(9): 16-19.
FENG Zhi-Jun, LAI Zi-hui. The Determination of Shear Strength of Rock Discontinuity in Margin Balance Analysis of Cut Slope. 铁道工程学报, 2006, 23(9): 16-19.
2006, Vol. 23 
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