压剪荷载作用下硬质岩石裂隙的峰后剪胀特性及其演化规律

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Abstract The dilatancy and its evolution of fractures under normal and shear loads are essential to understanding deformation behavior，coupled hydromechanical behavior and anchorage mechanism of fractured rock masses. Although the dependencies of joint dilatancy on plasticity，normal stress and scale effect have been demonstrated in the literature，the evolution of dilatancy remains an open issue for rock fractures. Existing studies commonly adopted a constant dilatancy angle between 0 and 20 or the internal friction angle to characterize the dilatancy behavior. As a result，the normal deformation of rock fractures induced by dilatancy may either be underestimated at small shear displacements，or be overestimated at relatively large ones. The post-peak dilatancy behavior and its evolution are better modeled by the formulae for peak dilatancy angles of rock fractures proposed by N. Barton and a mobilized dilatancy evolution model in negative exponential form. The proposed model have been validated by a number of existing laboratory shear tests；and it may provide a useful expression for investigating the deformation，seepage flow and reinforcement behaviors of jointed rock masses.

Key words： rock mechanics dilatancy evolution hard rock fractures shear test

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	Articles by authors
	BAI Zhengxiong
	CHEN Yifeng
	ZHOU Chuangbing
	LI Dianqing
	RONG Guan

Cite this article:

BAI Zhengxiong,CHEN Yifeng,ZHOU Chuangbing, et al. POST-PEAK DILATANCY AND ITS EVOLUTION OF HARD ROCK FRACTURES UNDER NORMAL AND SHEAR LOADS[J]. , 2010, 29(S2): 4131-4138.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/4131

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