岩石RHT模型主要参数敏感性及确定方法研究
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摘要
在34个RHT模型参数中,19个参数可以通过试验、理论研究等手段获得,但还剩15个参数较难确定.为了较为准确的获得相关参数,在只改变参数N、p_(comp)、f_t~*、f_s~*、A、n、Q_0、g_c~*、ξ、D_1、ε_p~m、A_f、n_f、B、g_t~*的情况下,利用LS-DYNA对石灰岩进行单轴、三轴压缩模拟计算,通过对比RHT模型的弹性、线性强化以及损伤软化段的曲线对以上15个参数的敏感性进行研究,并以红砂岩为例,利用SHPB冲击红砂岩获得应力-应变曲线,并通过静力学、声波测试等试验获得红砂岩相关物理参数,以LS-DYNA模拟SHPB冲击试验作为手段,通过正交试验的方法得到了红砂岩的RHT模型参数,为了验证所确定参数的正确性,将LS-DYNA模拟SHPB冲击红砂岩的曲线与SHPB冲击试验曲线进行了对比,取得了令人满意的效果.
Among the total 34parameters of RHT constitutive model,there are 19parameters can be confirmed from experiment or theoretical study,but the left ones,N、p_(comp)、f_t~*、f_s~*、A、n、Q_0、g_c~*、ξ、D_1、ε_p~m、A_f、n_f、Band g_t~*,are generally hard to acquire.A sensitivity study of the 15hard-acquired parameters was conducted through numerical simulation of uniaxial and triaxial compression of limestone using LS-DYNA.And then a new method was proposed in this paper to acquire all 34parameters of RHT model in terms of red sandstone by orthogonal experiment coupled with static test,sonic wave test,SHPB impact test and LS-DYNA numerical simulation.The simulated result of red sandstone is in a well line with the result from SHPB impact test of red sandstone,which evidenced the RHT model of red sandstone is effective.
Among the total 34parameters of RHT constitutive model,there are 19parameters can be confirmed from experiment or theoretical study,but the left ones,N、p_(comp)、f_t~*、f_s~*、A、n、Q_0、g_c~*、ξ、D_1、ε_p~m、A_f、n_f、Band g_t~*,are generally hard to acquire.A sensitivity study of the 15hard-acquired parameters was conducted through numerical simulation of uniaxial and triaxial compression of limestone using LS-DYNA.And then a new method was proposed in this paper to acquire all 34parameters of RHT model in terms of red sandstone by orthogonal experiment coupled with static test,sonic wave test,SHPB impact test and LS-DYNA numerical simulation.The simulated result of red sandstone is in a well line with the result from SHPB impact test of red sandstone,which evidenced the RHT model of red sandstone is effective.
引文
[1]Riedel W,Kawai N,Kondo K.Numerical assessment for impact strength measurements in concrete materials[J].International Journal of Impact Engineering,2009,36:283-293.
[2]张雄,廉艳平,刘岩.物质点法[M].北京:清华大学出版社,2013.Zhang Xiong,Lian Yanping,Liu Yan.Material point method[M].Beijing:Tsinghua University Press,2013.(in Chinese)
[3]黄永辉.立井硬岩深孔锥形掏槽爆破技术研究[D].北京:中国矿业大学(北京),2013.Huang Yonghui.The technology study on long-hole pyramid cut blasting in hard rock vertical shaft[D].Beijing:China University of Mining&Technology-Beijing,2013.(in Chinese)
[4]王宇涛.基于RHT本构的岩体爆破破碎模型研究[D].北京:中国矿业大学(北京),2015.Wang Yutao.The study of the broken model for rock mass blasting based on RHT constitutive equations[D].Beijing:China University of Mining&Technology-Beijing,2015.(in Chinese)
[5]Thomas B,Werner R.The RHT concrete model in LSDYNA[C]∥Proceedings of the 8th European LS-DYNA Users Conference.Strasbourg:[s.n.],2011:75-81.
[6]Meyers M A.Dynamic behavior of materials[M].New York:Wiley&Sons,1994.
[7]Thomas B,Werner R.The RHT concrete model in LSDYNA[C]∥Proceedings of the 8th European LS-DYNA Users Conference.Strasbourg:[s.n.],2011:64-70.
[8]吴贵生,于治福,于淑政.试验设计与数据处理[M].北京:冶金工业出版社,1997.Wu Guisheng,Yu Zhifu,Yu Shuzheng.Experimental design and data processing[M].Beijing:Metallurgical Industry Press,1997.(in Chinese)
[9]李洪超.岩石RHT模型理论及主要参数确定方法研究[D].北京:中国矿业大学(北京),2016.Li Hongchao.The study of the rock RHT model and to determine the value of main parameters[D].Beijing:China University of Mining&Technology-Beijing,2016.(in Chinese)
[2]张雄,廉艳平,刘岩.物质点法[M].北京:清华大学出版社,2013.Zhang Xiong,Lian Yanping,Liu Yan.Material point method[M].Beijing:Tsinghua University Press,2013.(in Chinese)
[3]黄永辉.立井硬岩深孔锥形掏槽爆破技术研究[D].北京:中国矿业大学(北京),2013.Huang Yonghui.The technology study on long-hole pyramid cut blasting in hard rock vertical shaft[D].Beijing:China University of Mining&Technology-Beijing,2013.(in Chinese)
[4]王宇涛.基于RHT本构的岩体爆破破碎模型研究[D].北京:中国矿业大学(北京),2015.Wang Yutao.The study of the broken model for rock mass blasting based on RHT constitutive equations[D].Beijing:China University of Mining&Technology-Beijing,2015.(in Chinese)
[5]Thomas B,Werner R.The RHT concrete model in LSDYNA[C]∥Proceedings of the 8th European LS-DYNA Users Conference.Strasbourg:[s.n.],2011:75-81.
[6]Meyers M A.Dynamic behavior of materials[M].New York:Wiley&Sons,1994.
[7]Thomas B,Werner R.The RHT concrete model in LSDYNA[C]∥Proceedings of the 8th European LS-DYNA Users Conference.Strasbourg:[s.n.],2011:64-70.
[8]吴贵生,于治福,于淑政.试验设计与数据处理[M].北京:冶金工业出版社,1997.Wu Guisheng,Yu Zhifu,Yu Shuzheng.Experimental design and data processing[M].Beijing:Metallurgical Industry Press,1997.(in Chinese)
[9]李洪超.岩石RHT模型理论及主要参数确定方法研究[D].北京:中国矿业大学(北京),2016.Li Hongchao.The study of the rock RHT model and to determine the value of main parameters[D].Beijing:China University of Mining&Technology-Beijing,2016.(in Chinese)