Effects of temperature and age on physico-mechanical properties of cemented gravel sand backfills

作     者：JIANG Fei-fei ZHOU Hui SHENG Jia KOU Yong-yuan LI Xiang-dong 江飞飞;周辉;盛佳;寇永渊;李向东

作者机构：State Key Laboratory of Geomechanics and Geotechnical EngineeringInstitute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of SciencesBeijing 100049China National Engineering Research Center for Metal MiningChangsha Institute of Mining Research Co.Ltd.Changsha 410012China School of Resource&Environment and Safety EngineeringHunan University of Science and TechnologyXiangtan 411201China Jinchuan Group Co.Ltd.Jinchang 737104China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2020年第27卷第10期

页      面：2999-3012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：Project(P2018G045)supported by the Science&Technology Research and Development Program of China Railway Project(2018CFA013)supported by the Hubei Provincial Natural Science Foundation Innovation Group,China Project(KFJ-STS-QYZD-174)supported by the Science and Technology Service Network Initiative of the Chinese Academy of Sciences Project(51709257)supported by the National Natural Science Foundation of China 

主　　题：cemented backfill gravel sand temperature physico-mechanical properties deformation characteristics 

摘      要：Cemented backfill used in deep mines would inevitably be exposed to the ambient temperature of 20−60℃in the next few *** this paper,two types of cemented gravel sand backfills,cemented rod-mill sand backfill(CRB)and cemented gobi sand backfill(CGB),were prepared and cured at various temperatures(20,40,60℃)and ages(3,7,28 d),and the effects of temperature and age on the physico-mechanical properties of CRB and CGB were investigated based on laboratory *** show that:1)the effects of temperature and age on the physico-mechanical properties of backfills mainly depend on the amount of hydration products and the refinement of cementation *** temperature has a more significant effect on thermal expansibility and ultrasonic performance at early ages.2)The facilitating effect of temperature and age on the compressive strength of CGB is higher than that on *** the increase of temperature,the compressive failure modes changed from X-conjugate shear failure to tensile failure,and the integrity of specimens was significantly improved.3)Similarly,the shear performance of CGB is generally better than that of *** temperature has a weaker effect on shear strength than age,but the shear deformation and shear plane morphology are closely related to temperature.