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中文摘要：
以锦屏二级为a 程背景，通过对猫猫滩闸址区域内断层的统计，得到断层数量与尺度的幂律关系，并通过分段线性拟合的方法估算了断层系统的尺度-数量分维发现，当断层迹长，〈0．1km时，分维D=0．4875；当断层迹长r〉0．1km时，分维D=1．4961。通过该尺度律关系，结合蒙特卡洛法，推演了更小规模的节理的空间分布。运用DDA数值计算程序，分析并模拟了大水沟地下厂房的开挖过程，获得了高度节理化的由开挖引起的应力、位移变化图。
英文摘要：
Based on the Jinping second stage hydropower station, a distribution diagram of faults, is obtained from the geological diagram at Maomaotan lock site. A power-law relation between fault number and fault size is proposed, i.e. N（r） - r^-D. Two power exponents are estimated by using linear fitting in two segments. It is found that the power exponent D has a value of 0.48 if fault lengths r are shorter than 0.1 kin; while the power exponent is equal to 1.49 if fault lengths r are longer than 0.1 km. Combining with Monte Carlo method, the spatial distribution of a further small scale of joints can be obtained. Finally, the discontinuous deformation analysis （DDA） is employed to numerically simulate and analyze the excavation of the Dashuigou underground powerhouse; and the stress and displacement plots resulted from excavation in highly jointed rock mass are obtained.
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