冲击作用下含水煤样能量吸收和耗散规律及本构关系研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (6) : 202-211.

论文

翟新献1，翟俨伟2，刘勤裕1，赵晓凡1，任柱安1，郭钊洋1

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Energy absorption and dissipation and the constitutive relation of water-bearing coal specimens under impact load

ZHAI Xinxian1,ZHAI Yanwei2,LIU Qinyu1,ZHAO Xiaofan1,REN Zhu’an1,GUO Zhaoyang1

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文章历史 +

摘要

煤层注水是综放开采回采巷道预防冲击地压的主要措施之一。为了研究含水煤样动态力学性质和力学参数，利用霍普金森压杆（SHPB）试验系统，对不同含水率的圆柱形煤样进行单轴冲击压缩试验，研究含水率和冲击速度对煤样动态应力-应变曲线、动态力学参数以及耗散能变化规律的影响。研究结果表明：（1）煤样动态力学参数与冲击速度和含水率有关。当煤样含水率一定时煤样动态抗压强度、动态弹性模量与冲击速度成正相关；而冲击速度一定时煤样动态抗压强度、动态弹性模量与含水率成负相关。（2）在冲击过程中煤样的损伤耗散能直接反映煤样中微裂隙发育程度，随着冲击时间的增加，煤样损伤耗散能增大，煤样坍塌破坏时损伤耗散能达到最大值。当含水率一定时煤样破坏耗散能与冲击速度成正相关；而冲击速度一定时煤样破坏耗散能与含水率成负相关。（3）损伤因子定义为煤样损伤耗散能与破坏耗散能的比率。基于煤样单轴冲击压缩试验结果，建立了煤样损伤体-黏弹性本构模型和本构关系，对不同含水率煤样动态应力-应变试验曲线进行理论拟合，理论拟合曲线与试验曲线拟合度高，因此理论曲线可用来表示单轴冲击压缩煤样的应力-应变关系。研究结论为冲击地压矿井深孔煤层注水预防冲击地压提供了理论基础。

Abstract

Coal seam water injection is one of the main measures to prevent coal bump in the gateways of fully mechanized caving face. In order to study dynamic mechanical properties and mechanical parameters of water-bearing coal specimens, the uniaxial impact compression tests of cylindrical coal specimens with different moisture contents were carried out by using the Hopkinson pressure bar (SHPB) test system. The effects of moisture contents and impact velocities on the dynamic stress-strain curves, dynamic mechanical parameters, and dissipation energies of coal specimens were studied. (1) Dynamic mechanical parameters of coal specimens are related with their impact velocities and moisture contents. When the moisture contents of coal specimens are a constant, the dynamic compressive strength and dynamic elastic modulus of coal specimens are positively correlated with the impact velocities. When the impact velocities are a constant, the dynamic compressive strength and dynamic elastic modulus of coal specimens are negatively correlated with their moisture contents. (2) The damage dissipation energies of coal specimens during impact directly reflects their degree of micro-fracture development. With the increase of impact time, the damage dissipation energies of coal specimens increase, and the damage dissipation energies reach the maximum when the coal specimens collapses. When the moisture contents are a constant, the failure dissipation energies of coal specimens are positively correlated with the impact velocities; When the impact velocities are a constant, failure dissipation energies of the coal specimens are negatively correlated with their moisture contents. (3) The ratio of damage dissipation energy to failure dissipation energy of coal specimen is defined as its damage factor. Based on the uniaxial impact compression tests results of coal specimens, their damage-viscoelastic constitutive model and constitutive relation were established. The dynamic stress-strain experimental curves of coal specimens with different moisture contents were theoretically fitted. The fitting degree between the theoretical and the experimental curves was higher, so the theoretical curves can be used to represent the stress-strain relationship of uniaxial impact compression coal specimens. The conclusions provide a theoretical basis for the prevention of rockburst by coal seam water injection into deep-holes in coal bump mines.

导出引用

翟新献1，翟俨伟2，刘勤裕1，赵晓凡1，任柱安1，郭钊洋1. 冲击作用下含水煤样能量吸收和耗散规律及本构关系研究[J]. 振动与冲击, 2023, 42(6): 202-211

ZHAI Xinxian1,ZHAI Yanwei2,LIU Qinyu1,ZHAO Xiaofan1,REN Zhu’an1,GUO Zhaoyang1. Energy absorption and dissipation and the constitutive relation of water-bearing coal specimens under impact load[J]. Journal of Vibration and Shock, 2023, 42(6): 202-211

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