今天是2017年09月22日

乌东德坝区拱座岩体三维裂隙连通率特征

DOI:10.3799/dqkx.2013.067

作者:王晓明;黄孝泉;夏露;王吉亮;肖云华;于青春

联系地址:中国地质大学水资源与环境学院;长江三峡勘测研究院有限公司;长江勘测规划设计研究院;上海交通大学土木工程博士科研流动站

摘要:裂隙连通率是进行岩体稳定性评价不可或缺的参数,合理确定三维裂隙连通率的大小一直是岩体力学中的难题之一.结合金沙江乌东德水电站工程,采用投影法对乌东德坝区850m高程的拱座岩体进行了三维连通率研究.根据研究区域的工程地质条件,确定了拱座岩体的潜在滑动边界;采用逆建模方法建立拱座岩体的裂隙网络模型;在裂隙网络模型中设置不同大小、不同位置和不同方位的投影面进行三维连通率求解,探讨三维连通率的尺寸效应、分布特征和空间变化规律.研究结果表明:侧滑面连通率尺寸效应显著而底滑面连通率尺寸效应不明显;侧滑面连通率近似呈正态分布,左岸侧滑面连通率均值为3.9%,右岸侧滑面连通率均值为8.1%;侧滑面连通率随空间方位产生明显变化,投影面倾角越大,侧滑面连通率越小.这为乌东德坝区拱座岩体的稳定性评价提供了重要的参数依据.

关键字:稳定性评价;三维裂隙连通率;投影法;拱座岩体;投影面;岩体力学

Characteristics of Three Dimensional Fracture Persistence of Abutment Rock Mass in Wudongde Dam Area

Author:WANG Xiaoming, HUANG Xiaoquan, XIA Lu, WANG Jiliang, XIAO Yunhua, YU Qingchun

Author Address:1.School of Water Resources and Environment, China University of Geosciences, Beijing100083, China2.Three Gorges Geotechnical Consultants Co., Ltd., Wuhan430074, China 3.Changjiang Institute of Survey, Planning, Design and Research, Wuhan430010, China 4.Postdoctoral Flow Station of Civil Engineering and Architecture, Shanghai Jiao Tong University, Shanghai200240, China

Abstract:Fracture persistence is an essential parameter to evaluate the stability of rock mass. The calculation of threedimensional (3D) fracture persistence has always been a difficulty in rock mechanics. In the present study, a projection method based on fracture network modeling is employed to study the 3D fracture persistence of abutment rock mass in Wudongde dam area. According to the engineering geological conditions, the potential sliding boundaries of abutment rock mass on each bank are determined. Subsequently fracture networks are constructed by an inverse method. In fracture networks, projection planes with different sizes, different positions and different orientations are set to calculate 3D fracture persistence. The scale effects, distribution characteristics and the changes of persistence on lateral slip surface with directions are discussed. The following conclusions are drawn from the study: (1) the lateral slip surface has marked scale effect whereas bottom slip surface does not; (2) due to the inhomogeneous rock mass, the distribution type of 3D persistence of lateral slip surface are approximately normal. The mean value of persistence of lateral slip surface on left bank is 3.9% and that on right bank is 8.1%; (3) the persistence of lateral slip surface varies with the directions changes. The steep dip of projection plane corresponds to a low persistence value of lateral slip surface. The study provides a parameter basis for evaluating the stability of abutment rock mass in Wudongde dam area

Keyword:stability evaluation; three dimensional fracture persistence; projection method; abutment rock mass; projection plane; rock mechanics

 

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作者简介:王晓明(1984-),男,博士研究生,主要从事岩体裂隙及块体理论的研究工作

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