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

Journal of Central South University 2020年第10期27卷 2999-3012页

作者： JIANG Fei-fei ZHOU Hui SHENG Jia KOU Yong-yuan LI Xiang-dong State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China National Engineering Research Center for Metal Mining Changsha Institute of Mining Research Co.Ltd.Changsha 410012China School of Resource&Environment and Safety Engineering Hunan University of Science and TechnologyXiangtan 411201China Jinchuan Group Co. Ltd.Jinchang 737104China

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.

关键词： cemented backfill gravel sand temperature physico-mechanical properties deformation characteristics

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