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岩体结构面形貌存在明显的各向异性和尺寸效应特征。由于结构面本身的复杂性,定量表征其属性仍是该领域的研究难点。鉴于此,考虑岩体结构面的地质本质性特征,应用地质统计学原理,提出采用变异函数参数(基台C和变程a)表示结构面粗糙度(JRCv)的方法;然后采用量纲分析法,给出JRCv表达式。应用提出的公式计算结构面上不同尺寸范围(100 Pixel×100 Pixel~1 000 Pixel×1 000 Pixel)32个方向上的JRCv值,分析结构面粗糙度各向异性及其尺寸效应特征。研究结果表明:(1)从表观看,沿分析方向,结构面越粗糙,JRCv值越大,JRCv可以定量表征结构面粗糙度及其各向异性特征;(2)在结构面分析方向上,随尺寸范围的增大,JRCv值逐渐减小,达到一定范围时,JRCv值趋于稳定,通过分析各方向上JRCv值随尺寸范围的变化趋势,可以确定结构面的临界范围;(3)结构面各向异性特征受结构面研究范围的影响,当研究范围达到一定尺度时,结构面各向异性特征趋于稳定。该研究成果将为定量分析岩体结构面力学性质强弱方向提供依据,为实验室或原位结构面力学试验选择合理尺寸试件提供一种新方法。
There is obvious anisotropy and size effect characteristics of rock mass structure surface morphology. Due to the complexity of the structural plane itself, quantitative characterization of its properties is still a difficult area of research. In view of this, taking into account the geologic nature of the structural plane of the rock mass, the method of using geostatistics to propose the structural surface roughness (JRCv) using the parameters of the variation function (abutment C and the variation a) is proposed. Then, Method, gives the JRCv expression. The proposed formulas are used to calculate the JRCv values in 32 directions with different size range (100 Pixel × 100 Pixel ~ 1 000 Pixel × 1 000 Pixel) on the structural plane. The anisotropy of the roughness of the structural plane and its dimensional effect are analyzed. The results show that: (1) JRCv can quantitatively characterize the roughness and anisotropy of structural planes according to the analysis direction, the rougher the structural planes and the larger JRCv values; (2) In the direction of structural plane analysis, As the size range increases, the JRCv value decreases gradually. When reaching a certain range, the JRCv value tends to be stable. The critical range of the structural plane can be determined by analyzing the trend of the JRCv value with the size range in all directions. (3) The anisotropy of surface is affected by the research area of structure surface. When the research scope reaches a certain scale, the anisotropy of structure surface tends to be stable. The results of this study will provide a basis for quantitative analysis of the strength and weakness of the mechanical properties of rock mass structural planes and provide a new method for selecting reasonable size specimens for mechanical testing of in-situ structural planes or in-situ structures.