基于通用椭圆盘模型及3DEC实现的节理岩质边坡稳定性分析  

Stability analysis of jointed rock slopes based on a universal elliptical disc model and its realization in 3DEC

作　　者：蒋水华 陈佳栋 邹宗毅 郑俊[2] 黄劲松[1] JIANG Shuihua;CHEN Jiadong;ZOU Zongyi;ZHENG Jun;HUANG Jinsong(School of Infrastructure Engineering,Nanchang University,Nanchang,Jiangxi 330031,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou,Zhejiang 310058,China)

机构地区：[1]南昌大学工程建设学院,江西南昌330031 [2]浙江大学建筑工程学院,浙江杭州310058

出　　处：《岩石力学与工程学报》2023年第7期1610-1622,共13页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金优秀青年科学基金项目(52222905);国家自然科学基金资助项目(52179103,42272326)。

摘　　要：构建节理岩质边坡三维离散裂隙网络是目前研究岩体内部不连续面分布的常用方法。为克服基于传统Baecher圆盘和多边形模型构建边坡三维离散裂隙网络模型的不足,提出基于通用椭圆盘模型构建三维离散裂隙网络在3DEC软件中的实现方法,进而准确高效评估节理岩质边坡稳定性。同时,简要介绍通用椭圆盘模型的基本原理,包括多边形裂隙平面化、最优椭圆盘模型拟合和空间椭圆盘模型生成等。给出在3DEC软件中基于通用椭圆盘模型构建节理岩质边坡三维离散裂隙网络的流程。最后以某露天矿边坡为例,调查不连续面组椭圆盘特征参数(长短轴比和旋转角)对边坡稳定性的影响,对比通用椭圆盘模型与传统Baecher圆盘模型之间的差别。结果表明:提出方法有效避免了繁琐的fish语言编程与效率较低的3DEC软件内部建模过程,实现了在3DEC软件中快速基于通用椭圆盘模型构建三维离散裂隙网络及进行边坡稳定性分析,为高效评估三维复杂节理岩质边坡稳定性提供了一种重要的技术手段。此外,阐明了通用椭圆盘模型特征参数对边坡稳定性的影响规律,说明了在工程实际中运用通用椭圆盘模型构建边坡离散裂隙网络的必要性。Constructing three-dimensional discrete fracture network(DFN)is a commonly-used method to simulate the random distribution of discontinuities in the rock masses for jointed rock slopes.To overcome the shortcomings of traditional Baecher disc and polygon models in constructing three-dimensional DFN model of a slope,in this paper,a method for generating an universal elliptical disc(UED)model-based DFN in 3DEC software is proposed.Based on this,the stability of a jointed rock slope can be accurately and efficiently evaluated.At the same time,the basic principles of the UED model are briefly introduced,including planarization of polygon fractures,optimal elliptic disc model fitting and generation of spatial elliptical disc model,etc.The procedure of constructing the DFN model of jointed rock slopes based on the UED model in 3DEC software is presented.Finally,taking an open pit mine slope as the example,the influences of characteristic parameters(ratio of long axis to short axis and rotation angle)of elliptic disc model for discontinuity groups on slope stability are investigated,and the differences between the UED model and traditional Baecher disc model are compared.The results show that the proposed method can avoid tedious programming using fish language and inefficient internal modeling of 3DEC software,and quickly construct the three-dimensional DFN based on the UED model and conduct slope stability analysis in 3DEC software.It thereby provides an important technical means for efficiently evaluating the stability of threedimensional complex jointed rock slopes.Additionally,the influences of the characteristic parameters of UED model on the slope stability are addressed.It is confirmed that it is of great necessity to construct the DFN of slope by using the UED model in engineering practice.

关 键 词：边坡工程 节理岩质边坡 稳定性分析 通用椭圆盘模型 三维离散裂隙网络 3DEC软件 

分 类 号：P642[天文地球—工程地质学]