基于Grasselli形貌参数的岩石节理初始剪胀角新模型

doi:10.13722/j.cnki.jrme.2018.0603

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Abstract The three-dimensional morphological parameters proposed by G. Grasselli are the key parameters describing the roughness of rock joints. The peak dilatancy angle was divided into the initial dilatancy angle and the relationship function ，and the Grasselli?s distribution function of the apparent dip angle was revised and compared to the cumulative grain size distribution of a soil in geotechnical engineering. By analyzing the Grasselli?s distribution function of the apparent dip angle，the effect of the parameter C on the shear strength of a rock joint was revealed，and a new model of the initial dilatancy angle of rock joints was developed. Comparisons among the new initial dilatancy angle model，Xia?s model and Yang?s model were conducted. The results shows that the initial dilatancy angle calculated by the new model is between those obtained by the other two models in most cases(82 groups in total) and the new model has a good agreement with the other two models. A new peak shear strength model was established based on the new initial dilatancy angle model. Comparisons between Grasselli?s model，Yang?s model，Xia?s model，Tatone?s model，Tian?s model and the developed model with the data of 30 groups rock joints published by G. Grasselli were performed，and the corresponding errors the peak shear strength are respectively 15.8%，11.7%，14.5%，10.0%，9.8% and 9.2%，among which the error calculated by the new model is the smallest. The new model is reasonable for estimating the peak shear strength of rock joints and provides a reference for rock engineering.

Key words： rock mechanics rock joints three-dimensional morphology Grasselli?s distribution function of the apparent dip angle initial dilatancy angle peak shear strength

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	Articles by authors
	CHEN Xi
	ZENG Yawu
	SUN Hanqing
	LIU Wei

Cite this article:

CHEN Xi,ZENG Yawu,SUN Hanqing, et al. A new model of the initial dilatancy angle of rock joints based on Grasselli′s morphological parameters[J]. , 2019, 38(1): 133-152.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0603 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I1/133

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