锚杆拉拔力学作用机制的DDA方法模拟研究  

DDA simulation study on the mechanical interaction mechanism of rock bolt pullout

作　　者：甯尤军 张仲秋 聂雯 吕昕阳 NING Youjun;ZHANG Zhongqiu;NIE Wen;Lü Xinyang(School of Mechatronic Engineering,Southwest Petroleum University,610500 Chengdu,China;Research Institute of Engineering Safety Assessment and Protection,Southwest Petroleum University,610500 Chengdu,China;School of Civil and Transportation Engineering,Hebei University of Technology,300410 Tianjin,China)

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]西南石油大学工程安全评估与防护研究院,成都610500 [3]河北工业大学土木与交通学院,天津300401

出　　处：《应用力学学报》2022年第3期536-542,553,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.51908186)。

摘　　要：为研究锚杆拉拔实验中锚杆与岩体间的力学作用过程和机制,在非连续变形分析(discontinuous deformation analysis,DDA)方法中实现锚杆-岩体界面耦合作用算法,采用多线性黏结滑移界面模型模拟锚杆的滑移脱黏,并针对锚杆拉拔力作用节点和脱黏节点提出专门算法。通过模拟结果与实验结果的对比,对文献中的三线性和四线性黏结滑移界面模型进行参数修正,并验证所提锚杆-岩体界面耦合作用算法的正确性和适用性。通过基于修正参数的多线性黏结滑移界面模型的锚杆拉拔DDA模拟,研究了锚杆的拉拔力-拉拔位移关系,以及不同拉拔力条件下锚杆-岩体界面切应力和锚杆轴力的分布与变化规律,并探讨了锚杆弹性模量对锚杆拉拔力学响应的影响。锚杆-岩体界面耦合作用算法的实现,也为岩体锚固的DDA模拟分析创造了条件。To study the mechanical interaction process and mechanism between rock bolt and rock mass in the pullout experiment,an interface coupling algorithm between the rock bolt and rock mass is introduced into the discontinuous deformation analysis(DDA)method,and the slip debonding of the rock bolt in the rock mass is represented by multi-linear bond-slip interface models.By comparing the simulation results with the experimental results,the parameters of the tri-linear and four-linear bond slip interface models from literatures are revised,and the correctness and applicability of the proposed interface coupling algorithm are validated.Through DDA simulations of rock bolt pullout based on the multi-linear bond-slip interface models with revised parameters,the pulling force and displacement relationship,and the distribution and variation rules of the interface shear stress and bolt axial force under different pulling force levels are studied.The influence of the rock bolt modulus on the rock bolt pullout mechanical response is also investigated.

关 键 词：锚杆拉拔 黏结滑移模型 轴力 界面切应力 非连续变形分析 

分 类 号：U455.7+1[建筑科学—桥梁与隧道工程]