硬石膏矿RHT动力学模型参数研究  

Study on Parameters of Anhydrite RHT Dynamic Model

作　　者：马凯 任高峰[1,2] 葛永翔 王扶成 石义虎 张聪瑞 张露伟 赵亮 于燕[5] MA Kai;REN Gao-feng;GE Yong-xiang;WANG Fu-cheng;SHI Yi-hu;ZHANG Cong-rui;ZHANG Lu-wei;ZHAO Liang;YU Yan(School of Resources and Environmental Engineering,Wuhan University of technology,Wuhan 430070,China;Key Laboratory of Green Utilization of Key Non-metallic Mineral Resources,Ministry of Education,Wuhan University of technology,Wuhan 430070,China;School of Civil Engineering and Architecture,Wuhan University of technology,Wuhan 430070,China;Anhui Chizhou conch cement Co.,LTD.,Chizhou 247100,China;Huaxin Cement Co.,Ltd.,Wuhan 430205,China)

机构地区：[1]武汉理工大学资源与环境工程学院,武汉430070 [2]武汉理工大学关键非金属矿产资源绿色利用教育部重点实验室,武汉430070 [3]武汉理工大学土木工程与建筑学院,武汉430070 [4]安徽池州海螺水泥股份有限公司,池州247100 [5]华新水泥股份有限公司,武汉430205

出　　处：《爆破》2024年第4期35-44,共10页Blasting

基　　金：国家自然科学基金(52174087)硬石膏矿空区群灾变链断链控制及精细化开发时空原理研究。

摘　　要：数值模拟计算是岩石动力学特性研究的重要手段,模型及参数的合理确定是保证模拟试验结果准确的关键。在RHT模型的34个参数中,19个参数可以通过试验、理论计算等手段获得,但还剩15个参数较难获得。为研究适用于硬石膏的模型参数,由试验分析、理论计算获得硬石膏的19个基本参数,采用LS-DYNA对15个较难获得参数开展单一因素变化下的SHPB模拟试验,对比应力-应变曲线对以上参数的敏感性程度并优化参数取值水平,进而通过正交试验对敏感程度较高的参数进行确定,最后将获得参数的模拟结果与室内试验结果对比分析。研究结果表明:RHT参数B、g^(*)_(t)、n、D _(1)、n_(f)、P_(comp)和N对应力-应变曲线基本无影响,而参数A、f^(*)_(s)、f^(*)_(t)、Q_(0)、g^(*)_(c)、ξ、ε^(m)_(p)和A_(f)对应力-应变曲线影响较大,进一步利用正交试验对应力-应变曲线影响较大的参数进行确定,获取了较为贴合硬石膏SHPB冲击试验曲线的RHT模型参数;在不同加载应变率下,硬石膏模拟试验的动态应力-应变曲线和破坏形态与室内试验表现出的规律一致,验证了模型参数适用于硬石膏矿。Numerical simulation is a vital tool for studying the dynamic characteristics of rock,with the accurate determination of models and parameters being the key to ensuring the reliability of simulation results.Among the 34 parameters of the RHT model,19 parameters can be obtained through experimental and theoretical calculations,but the remaining 15 are challenging to determine.Nineteen basic parameters of anhydrite were obtained through experimental analysis and theoretical calculation to identify the model parameters suitable for anhydrite.Furthermore,the LS-DYNA performed SHPB simulation tests on the 15 challenging parameters.The sensitivity of stress-strain curves to these parameters was compared,and the values were optimized.Parameters with high sensitivity were identified through orthogonal testing.Finally,simulation results were compared with laboratory test results.The findings indicate that RHT parameters B、g^(*)_(t)、n、D _(1)、n_(f)、P_(comp) and N have minimal impact on the stress strain curve,while parameters A、f^(*)_(s)、f^(*)_(t)、Q_(0)、g^(*)_(c)、ξ、ε^(m)_(p)andA_(f) significantly influence the curve.Furthermore,the parameters with a significant impact on the stress-strain curve were determined by orthogonal tests,and the RHT model parameters fitting the SHPB impact test curve were obtained.Under varying loading strain rates,the dynamic stress-strain curves and failure patterns of anhydrite simulation tests were consistent with laboratory tests,verifying the suitability of the model parameters for anhydrite.

关 键 词：硬石膏 RHT模型 敏感性 正交试验 SHPB 

分 类 号：TD87.2[矿业工程—非金属矿开采]