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黄土节理在黄土地区广泛分布,节理表面形态对其强度及渗流等特性有重要影响。在大量野外调研的基础上,选取合适场地采集了典型天然黄土节理试样,利用轮廓曲线仪测量节理表面形态,绘制了节理面二维及三维轮廓曲线。然后运用统计学方法计算了节理表面特征参数,研究表明,节理表面的全坐标高度分布为高斯分布或准高斯分布。通过选取高度均方根z_1、峰点密度η、坡度均方根z_2三个参数,根据数据统计结果确定单因素分级范围,进而利用模糊数学方法综合评价节理表面形态,最终得到了所取天然黄土节理试样表面形态的综合特征参数R_j及分级结果。研究发现,对于同一场地,Rj值较为接近,表明同场地的节理表面形态具有相似性;经验证,特征参数Rj与黄土节理剪切强度具有较好的相关性,表明了分级的合理性。
Loess joints are widely distributed in the loess area, and the joint surface morphology has an important influence on the strength and seepage. On the basis of a large number of field surveys, the samples of typical natural loess joints were collected at appropriate sites, and the surface morphology of joint was measured by using profile curve. The two-dimensional and three-dimensional profile curves of joint surfaces were drawn. Then the statistical method was used to calculate the feature parameters of the joint surface. The results show that the full coordinate height distribution of the joint surface is Gaussian distribution or quasi-Gaussian distribution. By selecting three parameters of height root mean square (z_1), peak densities (η) and root mean square (z_2), the single factor grading range was determined according to the statistical results of the data, and then the surface morphology of the joints was evaluated by fuzzy mathematics. Finally, Synthetic characteristic parameters R_j and grading results of joint surface morphology. It is found that the Rj values are close to each other for the same site, indicating similarities in the joint surface morphology. The correlation between the characteristic parameters Rj and the shear strength of loess joints is verified, which shows the rationality of classification.