利用压水试验构建裂隙网络系统的方法探讨--以溪洛渡水电站坝区玄武岩为例

利用钻孔常规压水试验（Lu值）资料，运用统计分析方法对Lu值大小的分级、分级频率的空间分布和随埋深的变化进行了量化分析，得出了不同级次的裂隙发育程度随埋深变化的规律，揭示了岩体裂隙发育规模、裂隙连通程度和不同级别的裂隙密度等特点；结合研究区地质构造与裂隙发育条件，提出了运用随机统计原理构建二维裂隙网络系统模式的方法；并结合中国西部溪洛渡水电站坝区玄武岩裂隙介质阐明了裂隙网络系统的构建方法与思路。

METHOD OF CONSTRUCTING FRACTURE NETWORK SYSTEM BY THE PUMP-IN TESTS:A CASE STUDY ON THE BASALT AROUND THE DAM AREA OF XILUODU HYDROELECTRIC STATION

This paper demonstrates how to use the statistic method to process the data of the regular pump in tests in boreholes and how to analyse the gradation of the L u values,the spatial distribution of the gradation and the variation of the L u values with to the burial depth.Also it points out how the scale of the fracture of different gradation varies with the burial depth.Meanwhile,it presents a method to generate a two dimensional fractures network system by statistically taking advantage of data from regular pump in tests in boreholes.It places special emphasis on how to determine the gradation of L u values and the relation between special distribution of gradation frequency and how to model the random fractures network.Finally,it verifies the feasibility of these methods in the case study on the basalt around the dam area of Xiluodu Hydroelectric Station.