复杂结构岩体三维裂隙网络密度的计算方法研究  

Study on calculation method of 3D fracture network density of complex rock mass

作　　者：王德库[1,2] 谭春[1,2] WANG De-ku;TAN Chun

机构地区：[1]中水东北勘测设计研究有限责任公司,吉林长春130061 [2]水利部寒区工程技术研究中心,吉林长春130061

出　　处：《东北水利水电》2022年第4期34-37,71,共5页Water Resources & Hydropower of Northeast China

摘　　要：岩体的力学性质受岩体中的结构面控制,但是结构面的展布特征十分复杂,仅用在现场二维露头面上采集的裂隙信息不能完整地反映结构面的发育特征。为了完整地反映结构面的发育特征,广泛应用三维裂隙网络模拟的方法。而裂隙的密度是三维裂隙网络模拟的关键参数之一。本文在预先确定三维裂隙网络中裂隙的位置、大小、产状等参数的前提下,采用模拟露头面切割三维裂隙网络,统计迹线条数的试算法,确定裂隙的密度。并以在建大藤峡水利枢纽泄水闸28号坝段下游岩体为例,计算了裂隙的密度。采用考察模拟露头面上的迹线半迹长的分布函数,并与现场实测裂隙半迹长的分布函数对比的方式,证明了本文方法的合理性,该方法有着广阔的应用前景。The mechanical properties of rock mass are controlled by the discontinuity in rock mass,but the distribution characteristics of the discontinuity are very complicated,and only the fracture information collected on the two-dimensional outcrop surface can not completely reflect the development characteristics of the discontinuity.In order to fully reflect the development characteristics of structural plane,3D fracture network simulation is widely used.The density of cracks is one of the key parameters of 3D fracture network simulation.On the premise of determining the location,size,occurrence and other parameters of cracks in 3D fracture network in advance,the density of cracks is determined by using the trial algorithm of simulating outcrop surface cutting 3D fracture network and counting trace lines.Taking the rock mass downstream of no.28 dam section of dam-gate of Datengxia Hydraulic Project as an example,the density of fissure is calculated.By investigating the distribution function of the half-trace length on the simulated outcrop surface and comparing it with the distribution function of the half-trace length of the fracture measured in the field,the rationality of the proposed method is proved,and the method has a broad application prospect.

关 键 词：裂隙岩体 三维裂隙网络模拟 裂隙密度 试算法 大藤峡水利枢纽 

分 类 号：TV223.1[水利工程—水工结构工程] P583[天文地球—岩石学]