Numerical and theoretical study of load transfer behavior during cascading pillar failure  

作　　者：Hangyu Dong Wancheng Zhu Leilei Niu Chen Hou Xige Liu 

机构地区：[1]College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou,450046,China [2]Center for Rock Instability and Seismicity Research,School of Resource and Civil Engineering,Northeastern University,Shenyang,110819,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第8期3014-3033,共20页岩石力学与岩土工程学报（英文版）

基　　金：financially supported by the National Key R&D Program of China(Grant No.2022YFC2903901);Enlisting and Leading Project of the Key Scientific and Technological Innovation in Heilongjiang Province,China(Grant No.2021ZXJ02A03,04);the North China University of Water Resources and Electric Power Launch Fund for High-level Talents Research(Grant No.40937).

摘　　要：To further study the load transfer mechanism of roofemulti-pillarefloor system during cascading pillar failure(CPF),numerical simulation and theoretical analysis were carried out to study the three CPF modes according to the previous experimental study on treble-pillar specimens,e.g.successive failure mode(SFM),domino failure mode(DFM)and compound failure mode(CFM).Based on the finite element code rock failure process analysis(RFPA^(2D)),numerical models of treble-pillar specimen with different mechanical properties were established to reproduce and verify the experimental results of the three CPF modes.Numerical results show that the elastic rebound of roofefloor system induced by pillar instability causes dynamic disturbance to adjacent pillars,resulting in sudden load increases and sudden jump displacement of adjacent pillars.The phenomena of load transfer in the roofemulti-pillarefloor system,as well as the induced accelerated damage behavior in adjacent pillars,were discovered and studied.In addition,based on the catastrophe theory and the proposed mechanical model of treble-pillar specimen edisc spring group system,a potential function that characterizes the evolution characteristics of roof emulti-pillarefloor system was established.The analytical expressions of sudden jump and energy release of treble-pillar specimenedisc spring group system of the three CPF modes were derived according to the potential function.The numerical and theoretical results show good agreement with the experimental results.This study further reveals the physical essence of load transfer during CPF of roof emulti-pillarefloor system,which provides references for mine design,construction and disaster prevention.

关 键 词：Cascading pillar failure(CPF) Load transfer Multi-pillar Numerical simulation 

分 类 号：TU45[建筑科学—岩土工程]