工程岩体随机结构面优势方向的表示法初探  

STUDY ON THE DOMINANT ORIENTATIONS OF RANDOM FRACTURES OF FRACTURED ROCK MASSES

作　　者：陈剑平[1] 石丙飞[1] 王清[1] 

机构地区：[1]吉林大学建设工程学院,吉林长春130026

出　　处：《岩石力学与工程学报》2005年第2期241-245,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40272117);2002 年高等学校博士学科点专项科研资助基金(20020183061)

摘　　要：结构面是控制岩体稳定性的重要因素,现代的重大工程需要对岩体的弱结构面进行精细的研究和描述。根据近年来对一些重大工程岩体随机结构面研究的体会,总结出工程岩体随机结构面的精细表示方法,其主要方法是采用概率统计的办法进行优势组数的统计,用右手法则的办法更为简洁客观地表示结构面的特征,以便更好地为工程服务。Fractures are important factors that control the stability of rock masses and need to be properly studied as demanded by modern rock engineering. For many decades, scholars at home and abroad have paid much attention to the study of the properties of random fractures, especially the geometrical properties of random fractures. But how to represent the random fractures intuitively that can be easily understood by practicing engineers remains to be a problem. Based on accumulated experiences during recent years with important rock engineering projects, this paper discusses an accurate representation method for random fractures of fractured rock masses. A data set with 2190 fractures investigated from the field of the Three Gorges dam site is used to be a case study, a conventional method of contour map and scatter plot of Schmidt lower hemisphere projection is shown some shortages of representing the distribution and delineation for the data set, because of the poles of fractures are randomly distributed in the Schmidt lower hemisphere projection. A new method to delineate the dominant fracture orientation by probability and statistics method applies the rule of right hand to classify the fracture orientations in order to clarify the geometrical features of fractures with more precision without personal judgments. A computer program is developed to carry out the complicated calculation and the visualized diagrams of fractures orientation by right hand rule are represented in the paper so as to be used by practicing engineers.

关 键 词：岩石力学 岩石破坏 优势方向 随机结构面 表示法 

分 类 号：TU452[建筑科学—岩土工程]