温度效应下胶结充填体动态强度及能量演化特征  

Effect of Temperature on Strength and Energy Evolution Characteristics of Cemented Backfill Mass Under Dynamic Loading

作　　者：吴琼[1] 郭进平[1] 王小林[1] 张超[1] 刘非 侯展娜 李婷婷[1] WU Qiong;GUO Jinping;WANG Xiaolin;ZHANG Chao;LIU Fei;HOU Zhanna;LI Tingting(School of Resources Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,Shaanxi,China;Northwest Nonferrous Geological and Mining Group Limited,Xi′an 710054,Shaanxi,China)

机构地区：[1]西安建筑科技大学资源工程学院,陕西西安710055 [2]西北有色地质矿业集团有限公司,陕西西安710054

出　　处：《矿冶工程》2025年第1期27-34,共8页Mining and Metallurgical Engineering

基　　金：陕西省自然科学基金(2024JC-YBQN-0507);国家资助博士后研究人员计划(GZC20232063);陕西省博士后科研项目(2023BSHYDZZ142)。

摘　　要：为分析不同温度条件下胶结充填体在动载作用下的强度变化特征,采用SHPB冲击试验,结合能量演化过程开展胶结充填体动态力学特性研究。结果表明:胶结充填体动态抗压强度随着养护温度提高而提高,破坏后发生明显的劈裂拉伸破坏;不同养护温度下充填体的应力应变曲线具有相似性,均可划分为似弹性阶段、塑性变形阶段、峰后破坏阶段3个阶段。充填体具有波阻抗效应,在近似应变率(100 s^(-1))条件下,冲击过程中77%左右能量被反射,2%左右能量透射穿充填体。随着养护龄期及养护温度提高,充填体吸能密度和透射能均上升。微观分析结果表明,随着养护温度提高,胶结充填体内部水化反应速率提升,水化程度增加且水化产物增多,充填体内部孔隙被水化产物填充,形成更加致密的微观结构,进一步证实了养护温度的提高能促进充填体早期强度的提升。In order to analyze the strength variation characteristics of cemented backfill mass at different temperatures under dynamic loading,a SHPB impact test was performed to study the mechanical properties of cemented backfill mass under dynamic loading during the energy evolution process.The results show that the compressive strength of the cemented backfill mass under dynamic loading increases as the curing temperature rises,and presents obvious splitting tensile failure.It is also found that the stress-strain curves of backfill mass at different curing temperatures are similar,all consisting of three stages:quasi-elastic stage,plastic deformation stage and post-peak failure stage.The backfill mass experiences a wave impedance effect.At an approximate strain rate(100 s^(-1)),about 77%of the energy is reflected and about 2%of the energy is transmitted through the backfill mass during the impact process.As the curing time is prolonged and the curing temperature rises,the energy absorption density and transmissive energy of the backfill mass increase.The micro-analysis shows that with the rise of curing temperature,the internal hydration reaction of backfill mass occurs at a higher rate,leading to higher degree of hydration and more hydration products.Those hydration products gradually fill in the internal pores of backfill mass,resulting in denser microstructure.It further confirms that increasing curing temperature can improve the early strength of backfill mass.

关 键 词：深部开采 胶结充填 冲击动载 养护温度 养护龄期 动态抗压强度 能量演化 温度效应 

分 类 号：TD853[矿业工程—金属矿开采]