基于PFC的全长灌浆锚固系统渐进失效过程模拟  

Simulation of progressive failure process of fully grouted anchorage system based on PFC

作　　者：刘秀军 马占国[1] LIU Xiujun;MA Zhanguo(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;Shenzhen Geotechnical Investigation&Surveying Institute(Group)Co.,Ltd.,Shenzhen 518028,Guangdong,China)

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]深圳市勘察测绘院(集团)有限公司,深圳518028

出　　处：《工程建设》2024年第10期7-15,共9页Engineering Construction

摘　　要：随着岩土锚固技术的飞速发展,锚固系统的变形破坏机理仍是当前的热点问题。鉴于PFC软件在模拟岩土体裂隙发育、扩展、失稳等非连续现象方面具有较明显的优越性,文章基于PFC5.0软件建立了全长灌浆锚固系统颗粒流计算分析模型,并根据室内试验和现场拉拔试验结果对模型细观参数进行了标定,从位移场演化规律、应力场演化规律、裂隙扩展规律、组构变化规律以及能量变化等5个方面,系统地总结了全长灌浆锚固系统在拉拔荷载作用下的渐进失效特征。研究表明:PFC能够很好地应用于全长灌浆锚固系统等离散介质的模拟分析中,锚固系统内的位移场、应力场、裂隙、组构及能量等的变化规律均能反映其承载性能状况。With the rapid development of geotechnical anchoring technology,the deformation and failure mechanism of anchoring systems remains a current hot topic.Given the significant superiority of PFC software in simulating discontinuous phenomena such as the development,expansion,and instability of rock and soil fractures,a particle flow calculation and analysis model for a fully grouted anchorage system was established based on PFC 5.0 software.The micro parameters of the model were calibrated based on indoor and on-site pull-out test results,and the progressive failure characteristics of the fully grouted anchorage system under pull-out load were systematically summarized from five aspects:displacement field evolution law,stress field evolution law,crack propagation law,constitutive change law,and energy change.This research has shown that PFC can be well applied in the simulation analysis of discrete media such as fully grouted anchorage systems.The variation patterns of displacement field,stress field,cracks,composition,and energy within the anchorage system can all reflect its load-bearing performance.

关 键 词：颗粒流软件(PFC) 全长灌浆锚固系统 拉拔试验 渐进失效 数值模拟 

分 类 号：TU470.3[建筑科学—结构工程]