岩石分形节理粗糙性对应力场影响的光弹模拟研究

节理的粗糙性是影响岩体力学特性的重要因素。现有的众多的研究结果表明：不规则的节理面具有很好的自相似特征，可以用分形几何去描述，节理面的分形维数是表征节理面粗糙度（ＪＲＣ）恰当的统计量。基于以上观点，为了能够精确地控制节理面的粗糙性，本文以Ｍａｎｄｅｌｂｒｏｔｗｅｉｅｒｓｔｒａｓｓ函数生成不同分维的分形曲线来模拟实际的粗糙节理面，制成光弹实验试样进行多组的单压和压剪实验，通过光弹条纹和接触点的变化来研究不规则的节理对于岩体变形，应力场的影响，得出了一些有益的结论．

Photoelastic Modelling Study on the Effect of Roughness of the Fractal Rock Joints on the Stress Field

The roughness of rock jointS has an important influence on the mechanicalbehaviours of rock joints.Studies indicate that irregular and rough rock joint surfaces behavegood self-similarity and can be described well by fractal geometry.The fractal dimension of thejoint surf see is an appropriate statistical quantity for characterizing the roughness of the jointsurface(JRC).Based on the above viewpoints,in this poper,the fractal curves with different dimensionsgenerated by Mandelbrot-Weierastrass function are used to model the actual rough jotnt surfscesin order to controll the jont roughness accurately.A serial of uniaxal compression andcompression-shear experiments of the synthesised rough joints are carried out by usingphotoelastic method.By means of isocromatic fringes and the variation of contact points,theeffects of the rough joints on the deformation and the stress field of rock masses are explored andsome interesting conclusions have been obtained.