基于通用椭圆盘模型的三维离散结构面网络模拟及其在边坡中的应用  

Discrete fracture network modelling based on the universal elliptical disc model for a rock mass and its application to a rock slope

作　　者：詹伟 郭吉超 严鑫 郑俊[3] ZHAN Wei;GUO Jichao;YAN Xin;ZHENG Jun(Key Laboratory of Road and Bridge Detection and Maintenance Technology Research of Zhejiang Province,Hangzhou 310023,Zhejiang,China;Zhejiang Scientific Research Institute of Transport,Hangzhou 310023,Zhejiang,China;Department of Civil Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China)

机构地区：[1]浙江省道桥检测与养护技术研究重点实验室,浙江杭州310023 [2]浙江省交通运输科学研究院,浙江杭州310023 [3]浙江大学建筑工程学院,浙江杭州310058

出　　处：《水利水电技术（中英文）》2023年第S02期378-386,共9页Water Resources and Hydropower Engineering

基　　金：浙江省道桥检测与养护技术研究重点实验室(202201Z)。

摘　　要：构建三维离散结构面网络(DFN)是国内外公认的定量表征岩体结构最有效的手段。目前基本将结构面假定为圆盘模型,然而针对形状各异的天然结构面,圆盘模型适用性不强。最近具有广泛适用性的通用椭圆盘(UED)模型已建立。基于UED模型,开展岩体三维离散结构面网络模拟研究。首先概述了UED模型的几何参数,具体包括中心点位置、产状、长轴长、长短轴之比、长轴旋转角、三维密度;然后,针对结构面在岩体露头的两种出露方式,分别介绍了UED模型几何参数的确定方法;最后,以某岩质边坡为例,详细介绍了基于蒙特卡洛模拟生成了该边坡岩体三维UED DFN网络的过程。此外,对比了UED模型与现有的圆盘模型和相似椭圆盘模型的表征精度,结果表明,UED模型的表征精度分别比圆盘模型和相似椭圆盘模型的高16%和22%。Constructing a three-dimensional discrete fracture network(DFN)is recognized as the most effective way to characterize rock structures both domestically and internationally.Currently,the circular disc model is commonly used to represent fractures.However,this model is not well suited to natural fracture with various shapes.In recent years,the universal elliptical disc(UED)model has been established.This paper characterizes and simulates rock fractures using the UED model.The paper first outlines the geometric parameters of the UED model,including the center point location,orientation,long axis length,long-short axis length ratio,rotation angle of the long axis,and three-dimensional density.[Methods]to determine the geometric parameters of the UED model are presented based on exposure types of fractures on rock outcrops.Finally,a rock slope from a gold mine is used as an example to demonstrate the practical application of UED-model-based discrete fracture network modelling using Monte Carlo simulation.In addition,the paper compares the representation accuracy of the UED model to those of the existing circular disc and similar elliptical disc models.The result illustrated that the representation accuracy of the UED model is 16%and 22%higher than those of the circular disc and similar elliptical disc models,respectively.

关 键 词：岩体 离散结构面网络 通用椭圆盘模型 岩质边坡 

分 类 号：P58[天文地球—岩石学]