韩亮;刘健修;
HAN Liang;LIU Jian-xiu;China Society of Explosives and Blasting;

• 1:中国爆破行业协会

摘要(Abstract)：

胶结充填体的稳定性对于矿山安全生产至关重要。为了研究动载作用下充填体的动力学特性,利用霍普金森压杆(SHPB)对充填体进行单轴冲击试验,研究充填体应力应变曲线、动态抗压强度、动态强度增长因子与平均应变率之间的关系。结果表明,当平均应变率低于60 s^(-1)时,应力应变曲线峰后阶段为"应变回弹"类型;超过80 s(-1)时,应力应变曲线峰后阶段为"应变回弹"类型;超过80 s^(-1)时,为"峰后塑性"类型;介于二者之间时,为"应力跌落"类型;随着平均应变率的增大,试样动态抗压强度先迅速增大,后趋于稳定,对应的平均应变率临界值为80 s(-1)时,为"峰后塑性"类型;介于二者之间时,为"应力跌落"类型;随着平均应变率的增大,试样动态抗压强度先迅速增大,后趋于稳定,对应的平均应变率临界值为80 s^(-1)。利用Gompertz模型能较好的描述充填体动态抗压强度与平均应变率之间的关系;动态强度增长因子与平均应变率正相关,当平均应变率处于40～130 s(-1)。利用Gompertz模型能较好的描述充填体动态抗压强度与平均应变率之间的关系;动态强度增长因子与平均应变率正相关,当平均应变率处于40～130 s^(-1),动态强度增长因子范围在1.5～3之间。
The stability of cemented backfill is very important to the safe production of the mine. In order to study the dynamic characteristics of the filling material under dynamic load, the Split Hopkinson Pressure Bar(SHPB) is used to perform the uniaxial impact test on it, and the relationship between the average strain rate and the stress-strain curve of the filling material, the dynamic compressive strength, or the dynamic strength increase factor respectively is studied. The results show that the post-peak stress-strain curve is the type of "strain rebound" when the average strain rate is lower than 60 s(-1),动态强度增长因子范围在1.5～3之间。
The stability of cemented backfill is very important to the safe production of the mine. In order to study the dynamic characteristics of the filling material under dynamic load, the Split Hopkinson Pressure Bar(SHPB) is used to perform the uniaxial impact test on it, and the relationship between the average strain rate and the stress-strain curve of the filling material, the dynamic compressive strength, or the dynamic strength increase factor respectively is studied. The results show that the post-peak stress-strain curve is the type of "strain rebound" when the average strain rate is lower than 60 s^(-1), it is the type of "post-peak plasticity" when the average strain rate exceeds 80 s(-1), it is the type of "post-peak plasticity" when the average strain rate exceeds 80 s^(-1), and it is the type of "stress drop" when the average strain rate is between 60 s(-1), and it is the type of "stress drop" when the average strain rate is between 60 s^(-1) to 80 s(-1) to 80 s^(-1). With the increase of the average strain rate, the dynamic compressive strength of the specimen increases rapidly firstly and then tends to be stable, and the critical value of strain rate is 80 s(-1). With the increase of the average strain rate, the dynamic compressive strength of the specimen increases rapidly firstly and then tends to be stable, and the critical value of strain rate is 80 s^(-1). The Gompertz model could well describe the relationship between the dynamic compressive strength and the average strain rate of the backfill. When the average strain rate is between 40 s(-1). The Gompertz model could well describe the relationship between the dynamic compressive strength and the average strain rate of the backfill. When the average strain rate is between 40 s^(-1) to 130 s(-1) to 130 s^(-1), the dynamic strength growth factor is between 1.5 to 3.

关键词(KeyWords)： 胶结充填体;霍普金森压杆;平均应变率;动态强度
cemented backfill;Split Hopkinson Pressure Bar;average strain rate;dynamic strength

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51974318)

作者(Authors): 韩亮;刘健修;
HAN Liang;LIU Jian-xiu;China Society of Explosives and Blasting;

DOI: 10.19931/j.EB.20200260

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