爆炸荷载作用下深部煤体损伤特征试验研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (19) : 276-286.

论文

爆炸荷载作用下深部煤体损伤特征试验研究

杨帅1，刘泽功1,2，张健玉1,2，傅师贵1,2，乔国栋1,2，张鑫 1，常帅1

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Test study on damage features of deep coal body under explosive load

YANG Shuai1, LIU Zegong1,2, ZHANG Jianyu1,2, FU Shigui1,2,QIAO Guodong1,2, ZHANG Xin1, CHANG Shuai1#br#

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摘要

为研究深部地应力影响下爆破后煤体的损伤情况及裂纹扩展规律，建立了地应力下煤体损伤模型和爆破孔环向应力分布规律。通过相似模拟试验和数值模拟与分形维数相结合的方法，探讨了地应力作用下煤体爆破后裂纹扩展规律。理论分析表明，炮孔受地应力的影响会发生二次应力分布；在双向等压条件下，裂纹沿偏离主应力方向45°发展，在双向异压条件下，裂纹朝与主应力角度为θ（θ=arctan(σx/σy)）方向发展。对比四组相似模拟试验：相对于无地应力条件下，3组对照试验各测点的应力大小和动载作用时间均减少，证明地应力对煤体爆破后的裂纹扩展起抑制作用；煤体裂纹会朝最大主应力方向扩展，最小地应力方向裂纹长度会随着应力差的增大而减小。通过ANSYS/LS-DYNA建立了三维煤体模型对不同地应力条件下进行了爆破模拟，模拟结果表明：平行于最大主应力方向的裂纹发育受到促进作用，而垂直于最大主应力方向的裂纹则会受到抑制。同时，通过线性拟合得到损伤量w和分形维数D之间的函数关系，建立了w=5.4381D10.45381的煤体损伤预测模型。

Abstract

Aiming to study the damage situation and crack propagation law of coal after blasting under the influence of deep ground stress, a coal damage model under ground stress and the distribution law of circumferential stress in blasting holes were established. By combining similarity simulation experiments and numerical simulation with fractal dimension, the crack propagation law of coal blasting under in-situ stress was explored. Theoretical analysis shows that the borehole undergoes secondary stress distribution under the influence of in-situ stress; Under biaxial isobaric conditions, cracks develop 45 ° away from the direction of the principal stress, while under biaxial isobaric conditions, the crack direction is at an angle to the principal stress θ（θ=arctan(σx/σy)）Development direction. Comparing four sets of similar simulation experiments: compared to the condition without ground stress, the stress magnitude and dynamic load action time of each measuring point in the three control experiments decreased, proving that ground stress has an inhibitory effect on crack propagation after coal blasting; The cracks in the coal body will propagate towards the maximum principal stress direction, and the crack length in the minimum geostress direction will decrease with the increase of stress difference. A three-dimensional coal body model was established using ANSYS/LS-DYNA to simulate blasting under different ground stress conditions. The simulation results showed that the development of cracks parallel to the maximum principal stress direction was promoted, while cracks perpendicular to the maximum principal stress direction were suppressed. At the same time, the functional relationship between the damage amount w and the fractal dimension D was obtained through linear fitting, and a coal damage prediction model with w=5.4381D10.45381 was established.

导出引用

杨帅1, 刘泽功1, 2, 张健玉1, 2, 傅师贵1, 2, 乔国栋1, 2, 张鑫 1, 常帅1. 爆炸荷载作用下深部煤体损伤特征试验研究[J]. 振动与冲击, 2024, 43(19): 276-286

YANG Shuai1, LIU Zegong1, 2, ZHANG Jianyu1, 2, FU Shigui1, 2, QIAO Guodong1, 2, ZHANG Xin1, CHANG Shuai1. Test study on damage features of deep coal body under explosive load[J]. Journal of Vibration and Shock, 2024, 43(19): 276-286

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