中文摘要：

贯穿白鹤滩水电站地下洞室群的层间错动带是发育于各岩流层顶部凝灰岩层中的缓倾角、贯穿性的错动构造。受不同地质构造作用的影响，在错动带内部形成夹碎裂岩和泥岩不同构造。由于其内部构造相对复杂，因此，其力学行为的描述也较为困难。为了直观合理地揭示其力学特性，将该地质构造考虑为一种上下接触，中间夹软弱带的“夹心饼干”结构。在现场试验的基础上，借助FLAC分析其力学特性，将获得的规律和计算参数应用到地下洞室群的围岩稳定分析中，利用抗剪强度极限平衡原理分析加强支护对错动带稳定的影响。

英文摘要：

The interlamination disturbed belt which gets through Baihetan hydropower station underground caverns, with the characters low-angle dip and perfoliate, is derived from vary top of tuff. In fact, it is a disturbed shear zone blending cataclasite and mudstone under complicated geological process. As its formation process and internal structure are relatively complicated, it is difficult to descript its mechanical behavior. In order to reveal its mechanical properties more intuitively and reasonably, its geological structure is considered as a ＇sandwich biscuit＇ which contacts upper and lower and clamps weak belts in the interlayer. Based on field test, FLAC is used to analyze its mechanical properties; and the acquired rules and calculation parameters are used to analyze the surrounding rock of underground cavems. The shear strength margin balance theory is used to analyze the influence of disturbed belt on the surrounding rock of underground caverns in order to provide support method and support parameters for the underground caverns.