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以某水电站为工程背景,介绍了两种确定裂隙岩体REV的新方法:数字图像处理法和非连续变形DDARF法。依据水电站岩性差异、风化及卸荷程度,将围岩划分为若干工程地质区段并建立随机裂隙网络模型,研究尺寸效应对岩体力学参数的影响规律,获得了REV表征尺寸和等效力学参数;得到岩体的非线性强度准则,嵌入FLAC3D对水电站开挖进行模拟,并监测关键点位移。结果表明:水电站围岩的抗压强度与围压成正相关;洞室开挖对厂房上下游中部和拐角处影响较大,应加强对这些部位的支护;关键点的位移数值结果与现场监测值基本吻合,误差小于5%。数字图像处理法和DDARF法为裂隙岩体REV的确定开拓了新思路,对复杂条件下地下洞室围岩的稳定性分析有广泛的应用前景。
Taking a hydropower station as a project background, two new methods for determining REV of fractured rock mass are introduced: digital image processing method and non-continuous deformation DDARF method. According to the difference of lithology, weathering and unloading degree of the hydropower station, the surrounding rock is divided into a number of engineering geological sections and a random fracture network model is established to study the rule of size effect on the mechanical parameters of the rock mass. REV characterization size and equivalent mechanics Parameters; Obtain the nonlinear strength criterion of rock mass, embed FLAC3D to simulate the excavation of hydropower station, and monitor the displacement of key points. The results show that compressive strength of surrounding rock of hydropower station is positively correlated with confining pressure. Excavation of cavern has a great influence on middle and upper and lower reaches of the plant, and should be strengthened. The displacement of key points and on-site monitoring The value of the basic agreement, the error is less than 5%. Digital image processing method and DDARF method have opened up new ideas for the determination of REV of fractured rock mass and have broad application prospects for the stability analysis of surrounding rock of underground caverns in complex conditions.