基于小波分析的岩体结构表面形貌各向异性研究  

Research on Anisotropy of Surface Topography of Rock Joints Based on the Wavelet Analysis

作　　者：徐磊[1] 任青文[2] 叶志才[2,3] 杜小凯[4] 

机构地区：[1]河海大学水利水电工程学院,南京210098 [2]河海大学土木工程学院,南京210098 [3]宿迁市水务局,宿迁223800 [4]中国水电工程顾问集团公司,北京100120

出　　处：《武汉理工大学学报》2010年第11期73-76,共4页Journal of Wuhan University of Technology

基　　金：国家重点基础研究发展"973"计划项目(2007CB714104);国家自然科学基金委员会和二滩水电开发有限责任公司雅砻江水电开发联合研究项目(50539030)

摘　　要：岩体结构面表面形貌的各向异性是岩体结构面的力学、渗流及其耦合性质存在各向异性的主要因素。采用人工劈裂方法制备了4个花岗岩结构面,在精确测试其表面形貌并进行数值化表达的基础上,截取二维表面轮廓线并对其几何组成进行分析,将二维表面轮廓线分为非稳态倾向、稳态一阶起伏度、稳态二阶粗糙度3个几何组成部分,并由此提出了二维表面轮廓线的3参数描述系统。基于小波分析,实现了对稳态一阶起伏度与稳态二阶粗糙度的分离。在上述基础上,对岩体结构面表面形貌的各向异性特征进行了系统深入的研究。研究表明,非稳态倾向与稳态一阶起伏度具有明显的各向异性特征;而稳态二阶粗糙度则可视为各向同性,对于岩性相同的结构面,稳态二阶粗糙度的描述参数值大多分布在某一长度较小的区间内。The mechanical property,seepage,and their coupling property of rock joints are greatly influenced by their surface topography.Based on the precise measurement of the surface topography of four artificial granite rock joints prepared by splitting method,the surface profiles are obtained and generalized as three parameters： non-stationary inclination,stationary first order wave,and stationary second order rough.The three-parameter description system of surface profiles is introduced.The stationary first order wave and stationary second roughness are separated by means of the wavelet analysis.Based on the above-mentioned,the anisotropy of surface topography of rock joints is researched systematically.The research results show that the non-stationary inclination and stationary first order wave are anisotropy,but the stationary second roughness can be viewed as isotropy,and its description parameter of the same type of rock joints is distributed in a small range.

关 键 词：岩体结构面 表面形貌 各向异性 小波分析 

分 类 号：TU452[建筑科学—岩土工程]