软弱夹层几何参数对试样力学行为影响颗粒元模拟研究  

PARTICLE FLOW CODE SIMULATION OF SPECIMEN MECHANICAL BEHAVIOR WITH DIFFERENT GEOMETRIC PARAMETERS OF WEAK SEAMS

作　　者：张晓平[1] 吴顺川[2] 张兵 潘文[4] 

机构地区：[1]中国科学院工程地质力学重点实验室,北京100029 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [3]中铁隧道集团有限责任公司科学技术研究所,洛阳471009 [4]中铁十八局集团第五工程有限公司,天津300222

出　　处：《工程地质学报》2008年第4期539-545,共7页Journal of Engineering Geology

基　　金：教育部矿山工程技术及其它学科重点支持项目(105016)

摘　　要：基于离散元理论的颗粒元程序,采用颗粒接触连接模型和滑动模型,建立了含软弱夹层试样的颗粒元模型。通过数值模型实验,对不同软弱夹层几何参数试样进行加载模拟,探讨了不同夹层厚度及不同倾角条件下试样的破坏过程和破坏形式,并分析其对试样强度的影响。模拟结果表明,裂隙首先产生于软弱夹层处,随着荷载的增加,再逐渐扩展,呈现渐进性破坏特征;夹层越厚,倾角越大,试样沿软弱夹层呈现较强的滑动特征,如果夹层薄且缓,软弱夹层成为试样破坏的非控制因素;软弱夹层厚度和夹角对试样的峰值强度都有影响,随软弱夹层厚度和夹角的增大,试样的峰值强度降低。Based on the distinct element method of particle flow, a specimen with weak seam of Particle Flow Code （PFC） model is made by using the contact -bond model and the slip model. The numerical model test is carried on with different weak seam parameters. Then the paper discusses contrasting failure process and form under different weak seam thickness as well as different inclination angle conditions, and analyzes the influence to specimen strength. Simulation result indicates that fissures are produced first in weak seam and then are expanded with loading, which presents the typical progressive failure process. When the weak seam is thicker and its obliquity is steeper, the specimen presenting the feature to slide along with the weak seam becomes more obvious. But if it is thin and small, the weak seam doesnt dominate the destroying of the specimen. The thickness and obliquity of the weak seam have influence on the specimen peak strength. The peak strength is decreased when the thickness and obliquity are increased. The relation between the kind of failure characteristic and the geometric parameters is ohtained from the numerical simulation. This relation offers a further understanding about mechanical property of weak seam and progressive failure.

关 键 词：软弱夹层 数值模拟 颗粒元 裂隙 渐进性破坏 

分 类 号：TD325[矿业工程—矿井建设]