Macroscopic deviations from isotropy occur due to bedding, schistosity and also sometimes fracturing . 与各向同性相差很大的情况往往产生于层理，片理，某些时候则由于断裂所造成。
2.
The main diagenetic stage and relevant rock types are the middle proterozoic assemblage of gneissoid granodiorite - adamellite and the sinean schistosity diorates 主要成岩期及代表性岩类有：中元古界为片麻状花岗闪长岩二长花岗岩，震旦纪为片理化闪长岩。
3.
( 3 ) ensemble character of structural planes as follows : in left dam abutment , meta basalt schistosity is main , and the structure is clockwise . low dip angle jointing did n ' t develop in rock mass ; in right dam abutment , rupture and jointing structural plane is main , and the structure is reversed . the structure was of obvious macroscopical slaty character ( 3 )通过对上述结构面的分析，得出其总体特征为：左坝肩以变玄武岩片理为主体，呈顺向结构，岩体内缓倾角节理极不发育；右坝肩主要为断裂及节理型结构面，呈反向结构，且具有明显的宏观板状结构特征，并发育有一定厚度的构造软岩带。
4.
Stability of rock slopes is generally controlled by the structure of rock masses , especially the soft structure surfaces . analysis of rock mass structures is a key to establish geological models and numerical simulation and a foundation to assess the stability of rock slopes . the weak structure surfaces are mainly bedding planes , faults , joints , schistosity plane and contact zones of intrusive bodies . since they are different in genesis and scale , the rock masses are different in features and mechanical intensities . based on the combination of rock structure bodies , 15 basic modes of deformation and failure of rock slope are systematically summarized . the deformation and failure of rock masses actually result from the recombination and rearrangement of these rock bodies . there are 11 types of rock mass structures and various deformation and failure of bank slopes are present in the reservoir area of the three gorge project 岩体结构，特别是软弱结构面对基岩斜坡变形与破坏具有显著的控制作用，岩体结构模式分析是建立斜坡地质模型和数学模型的关键和评价斜坡稳定性的基础。岩层层面断裂构造节理裂隙片理与劈理以及侵入体和围岩的接触带等是控制基岩斜坡稳定的软弱结构面，这些成因不同大小不一的结构面将岩体分割成性质各异力学强度不均的各种岩体结构体，构成了15种基岩斜坡变形破坏的岩体结构基本模式。不同结构体的重新组合与排列是斜坡失稳的内在原因。
