中文摘要：

白鹤滩水电站坝基岩体柱状节理十分发育,岩体中存在许多复杂节理面,各向异性特性十分显著.为了研究柱状节理岩体的各向异性特性,采用模型试验方法,考虑横向贯通节理,制作具有不同柱体倾角（β=0~90°）的正四棱柱形试样,通过单轴压缩试验得到柱状节理岩体在不同节理倾角β下的单轴抗压强度、变形模量和峰值应变,分别分析了不同倾角下应力-应变曲线、峰值强度、变形模量、峰值应变及破坏类型的特性,得到以下结论：倾角β=0~15°以及75~90°范围时,应力-应变曲线存在多峰现象,β=30~60°范围时,应力-应变曲线以单峰为主;单轴抗压强度在β=60°时取得最小值,β=90°时取得最大值,试件强度各向异性比K_c为11.12,属于极高各向异性;变形模量在β=60°时取得最小值,β=90°时取得最大值;峰值应变在β=60°时取得最小值,β=30°时取得最大值;试样主要有沿材料的劈裂破坏和沿贯通节理面的滑移破坏两种破坏模式.

英文摘要：

In the dam foundation of Baihetan Hydropower Station, the columnar jointed rock mass is the main composition and there are many complicated joint planes in it; therefore, it exhibits remarkable anisotropy pe- culiarity. In order to investigate the anisotropy peculiarity of columnar jointed rock mass, using model test method, taking transverse joint into account, making right square prism columnar jointed samples with differ- ent inclination （β） ranges from 0° to 90° for uniaxial compression tests. Through uniaxial compression tests, the compressive strength, deformation modulus and peak strain are obtained. Meanwhile, the paper analyzes the characteristics of stress-strain curve, peak strength, deformation modulus, peak strain and failure mode of samples. The results show that. when β is between 0° and 15°, 75°and 90°, stress-strain curve has a multi- peak phenomenon; when β is between 30°and 60°, stress-strain curve is unimodal; the uniaxial compression strength has the minimum value at β= 30° and it reaches the maximum value at β-90° the anisotropy ratio of the strength is as high as 11.12, which belongs to extremely high anisotropy. The deformation modulus has the minimum value at β=60° and it reaches the maximum value at β= 90°. the peak strain has the minimum value at β=60°, and it reaches the maximum value at β=30°. There are two main failure modes of samples, which are the splitting failure of the material and the sliding failure which is along the joint surface.