Experimental investigation of evolutive mode-I and mode-II fracture behavior of fiber-reinforced cemented paste backfill:Effect of curing temperature and curing time

作     者：Kun FANG Liang CUI Kun FANG;Liang CUI

作者机构：School of MinesChina University of Mining&TechnologyXuzhou 221116China Department of Civil EngineeringLakehead UniversityOntario P7B 5E1Canada 

出 版 物：《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿（英文版）)

年 卷 期：2023年第17卷第2期

页      面：256-270页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：the Natural Sciences and Engineering Research Council of Canada(NSERC)Discovery grant 

主　　题：fiber reinforcement cemented paste backfill fracture behavior underground mine cement hydration 

摘      要：The curing temperature-dependent cement hydration causes the nonlinear evolution of fracture behavior and properties of fiber-reinforced cemented paste backfill(CPB)and thus influences the stability of mine backfill materials in deep ***,the coupled effect of curing temperature(20,35,and 45℃)and cement hydration at different curing times(3,7,and 28 d)on the mode-I and mode-II fracture behavior and properties of fiber-reinforced CPB is investigated.A comprehensive experimental testing program consisting of semicircular bend tests,direct shear tests,measurement of volumetric water content and matric suction,TG/DTG tests,and SEM observation is carried *** results show that the coupled thermochemical effect results in strongly nonlinear development of pre-and post-peak behavior of fiber-reinforced ***,the results discover a positive linear correlation between fracture toughness and shear strength parameters and also reveal the vital role played by matric suction in the formation of fracture ***,predictive functions are developed to estimate the coupled thermochemical effect on the development of KIc and ***,the findings and the developed mathematical tools have the potential to promote the successful application of fiber-reinforced CPB technology in deep underground mines.