岩体结构面粗糙度系数确定方法研究现状

Current status of research on methods for determining joint roughness coefficients

岩体结构面粗糙度系数(Joint Roughness Coefficient,JRC)是影响结构面抗剪强度的重要参数,而抗剪强度是影响岩体稳定性的重要因素,因此对结构面粗糙度系数的研究具有十分重要的意义.在过去50年里,研究人员提出了各种方法来量化结构面粗糙度,但到目前为止研究提出的所有粗糙度参数中,结构面粗糙度系数仍然是实践中使用最广泛的参数.JRC具有形式简单、易于估计和明确考虑尺寸效应的优点,使其成为自提出以来应用最广泛的结构面粗糙度量化参数.因此,JRC引起了许多学者的关注,并在众多领域开发了定量表征JRC的相关方法.鉴于这种发展趋势,针对结构面粗糙度系数的确定方法进行了概述,并主要介绍了岩体结构面表面形态获取方法,粗糙度定量化表征参数的本质特性及适用性,以及对岩体结构面尺寸效应及各向异性的描述.此外,还讨论了采样间距和结构面趋势向对JRC的影响,以及现有JRC相关方法可能会在岩石工程中得到进一步改进和扩展的趋势.

The Joint Roughness Coefficient(JRC) of a rock mass is an important parameter that affects the shear strength of the structural face of rock mass,whereas the shear strength of the structural face is an important factor affecting the stability of the rock mass.In the past 50 years,researchers have proposed various methods to quantify nodal roughness,but so far,among all the roughness parameters proposed in the research,the JRC is the most widely used one in practice.JRC has the advantages of being simple in form,easy to estimate,and explicitly accounting for dimensional effects,which have made it the most widely used parameter for quantifying the roughness of structural surfaces since it was proposed.As a result,JRC has attracted the attention of many scholars,and there are related methods being developed for quantitatively characterizing JRC in many fields.Due to this development trend,an overview of the methods for determining structural surface roughness coefficients is presented in this paper,focusing on methods for obtaining the surface morphology of rock structural surfaces,the intrinsic properties and applicability of the quantitative roughness characterization parameter,and the description of the size effect and anisotropy of rock structural surfaces.In addition,the effects of sampling spacing and structural surface trend direction on JRC are discussed,and the prospects of future improvement and extension of the existing JRC-related methods in rock engineering are also elaborated.