中缓倾角结构面分类及其抗剪强度的研究

西南某坝区中缓倾角结构面具有分别倾向上游和下游的空间分布规律。根据结构面接触情况,首先将结构面分为刚性结构面和软弱结构面两大类。其中,刚性结构面属于裂隙型;软弱结构面根据其物质组成和结构特征,可以细分为岩块岩屑型、岩屑夹泥型、泥夹岩屑型3个亚类。断层类结构面具有垂直于断层走向,由高高程到低高程,由泥夹岩屑型→岩屑夹泥型→岩屑砾型→裂隙型逐渐过渡的发育规律。最后在分析抗剪试验资料和分类及发育规律的基础上,提出了抗剪强度指标的建议值。

CLASSIFICATION AND SHEAR STRENGTH OF ROCK STRUCTURAL PLANES WITH LOW TO MIDDLE INCLINATION ANGLES IN SOUTHWESTERN CHINA

The rock structure planes with low to middle inclination angles at some dam regions in the southwest of china have the spatial orientation rule of tendency toward either upstream or downstream. According to the structure of the surface contact, the planes are first divided into two big kinds: the rigid structure and the weak structure. Among them, the rigid structure belongs to the crevasse. The weak structure surface, according to its material composition and the structure characteristic, may be subdivided into 3 sub-groups including the clod rock debris, the rock debris clamps mud, the mud clamps the rock debris. Along the direction perpendicular to the fault strikes and from high elevation to low elevation, the fault structural planes have a development pattern gradually changing from the mud clamps rock debris, to the rock debris clamps mud, to the clod rock debris and to? crevasse . Finally based on the analyzing of shear test data, classification and development pattern, this paper puts forward an index value of shearing strength.