吻合度对节理力学特性影响的细观数值试验  

Influence of matching coefficient on joint mechanics characteristics based on meso-numerical analysis

作　　者：周峰[1] 张鹏[1] 王旭东[1] 

机构地区：[1]南京工业大学交通学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2015年第2期85-90,共6页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(NSFC41272302);国家自然科学青年基金(41102178)

摘　　要：岩石节理经过侵蚀、风化及工程扰动等影响后,节理面往往会呈现出不吻合特征,现有关于节理力学性质的研究均是基于Barton公式考虑节理粗糙度系数的完全吻合岩石节理,对不吻合节理还未系统深入研究,本文试图从细观力学角度研究吻合度对节理力学性质的影响规律。首先通过RIEGL LMS-Z420i三维激光扫描仪现场采集节理面起伏状态,以采集的起伏状态为骨架,采用分形插值函数构造节理面的细观几何形态,通过上、下节理面的水平错位移动来描述节理的吻合度;其次,从节理面凸凹点的细观变形出发,提出这些凸凹点集群化后表现出的宏观力学特征及其数值模拟方法,基于此方法,系统地研究吻合度对节理力学性质的影响规律,并通过试验验证该模拟方法的可靠性。研究表明节理的峰值剪切强度与节理粗糙度和吻合度系数的乘积值以及法向作用力成正比。When erision,weathering or engineering disturbance happened,non-matching characteristics occurred on rock joints.The researches on joint mechanics characteristics were now almost based on Barton formula with the joint roughness coefficient,while the research at non-matching joints is not systematically executed.In this paper,the research on non-matching joints was executed in meso scale.Firstly,three-dimensional laser scanner was used to collect the information of up and down points Then,the geometrical morphology by fractal interpolation function was described in mesoscale based on these points.After that,the macroscopic mechanics characteristics were analyzed by micromechanics.Finally the influences on non-matching joints were researched by numerical methods.Research showed that the peak of joints shear strength is proportional to the result of joint roughness coefficient multiplied by the matching rock joints and is proportional to the normal stress.

关 键 词：吻合度系数 粗糙度系数 不吻合节理 三维激光扫描仪 细观变形 

分 类 号：TU45[建筑科学—岩土工程]