潘谢煤田13-1煤层煤岩冲击动力学性能及本构关系的建立

发布时间：2018-03-19 04:00

本文选题：煤岩　切入点：SHPB　出处：《安徽理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以潘谢煤田13-1煤层原煤为研究对象,结合实验室实验、理论分析和数值模拟,对气煤煤岩的动态力学性能及本构关系进行了研究。利用分离式霍普金森压杆实验系统对潘谢煤田张集煤矿13-1煤层原煤进行了不同应变率下的单轴冲击压缩实验,成功采集了实验波形、煤岩破碎程度等数据,利用三波法对原始数据进行处理,得到了煤岩动态应力应变曲线。实验结果表明：煤岩的动态强度、动态弹性模量及破碎程度均具有较强的应变率敏感性,煤岩应力应变曲线表现出显著的应变硬化和应变率硬化等动态力学特性。针对煤岩的动态力学特性,根据粘弹性理论和损伤力学理论,简化朱-王-唐方程并引入动态损伤因子,建立了较好反映煤岩峰值应力前动态应力应变关系的本构方程。由单轴压缩实验和数据拟合得到全部本构方程的未知参数。结果表明：所拟合动态应力应变曲线与实测曲线吻合性较好,煤岩材料具有高应变率响应敏感性,且在高应变率条件下气煤比无烟煤表征更明显的脆性特征。基于煤岩动态本构方程,采用Fortran语言开发了VUMAT煤岩材料子程序,并利用商用有限元软件ABAQUS中的用户材料接口,将煤岩动态本构方程与ABAQUS接合起来,对不同应变率下煤岩材料的动态力学行为进行了有限元模拟。通过分析和比较,本文所开发的煤岩材料子程序能较好的反映煤岩的动态力学性能。
[Abstract]:In this paper, the dynamic mechanical properties and constitutive relations of coal and rock of gas coal are studied by taking the raw coal of coal seam 13-1 in PanXie coalfield as the research object, combining with the laboratory experiment, theoretical analysis and numerical simulation. The uniaxial impact compression experiment of coal seam 13-1 in Zhangji Coal Mine of PanXie coal field was carried out by using the split Hopkinson pressure bar experimental system. The experimental waveform and the degree of coal rock fragmentation were successfully collected. The dynamic stress-strain curves of coal and rock are obtained by using three-wave method. The experimental results show that the dynamic strength, dynamic elastic modulus and breaking degree of coal and rock have strong sensitivity to strain rate. The stress-strain curves of coal and rock show remarkable dynamic mechanical properties such as strain hardening and strain rate hardening. According to the dynamic mechanical properties of coal and rock, according to the viscoelastic theory and damage mechanics theory, the Zhu Wang-Tang equation is simplified and the dynamic damage factor is introduced. The constitutive equation of dynamic stress-strain relationship before peak stress of coal and rock is established. The unknown parameters of all constitutive equations are obtained by uniaxial compression experiment and data fitting. The results show that the dynamic stress-strain curve is fitted. The curve is in good agreement with the measured curve. Coal and rock materials are sensitive to high strain rate response, and gas coal shows more obvious brittleness than anthracite at high strain rate. Based on the dynamic constitutive equation of coal and rock, the subprogram of coal and rock material of VUMAT is developed by Fortran language, and the interface of user material in commercial finite element software ABAQUS is used to connect the dynamic constitutive equation of coal and rock with ABAQUS. The dynamic mechanical behavior of coal and rock materials under different strain rates is simulated by finite element method. Through analysis and comparison, the subroutine developed in this paper can better reflect the dynamic mechanical properties of coal and rock.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD313

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