高应变率下钻孔煤样冲击破坏试验及数值研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (9) : 309-320.

论文

张寅1，尹立冬1，代连朋2，张季平1，李家俊1，杨晨晨1

作者信息 +

Test and numerical study on impact failure of drilling coal samples under high strain rate

ZHANG Yin1,YIN Lidong1, DAI Lianpeng2, ZHANG Jiping1, LI Jiajun1, YANG Chenchen1

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文章历史 +

摘要

煤层钻孔是防治冲击地压常用的一种简单、经济和有效的降冲减灾手段。针对冲击地压发生后高应变率加载显现，揭示钻孔煤岩的冲击破坏物理过程及其减灾机制对于定量化设计煤层钻孔参数意义重大。为研究高应变率下钻孔对煤样力学性质的影响，通过室内SHPB试验及颗粒流数值模拟对预制孔煤样进行冲击试验。实验结果表明：高应变率加载下钻孔对煤样的动态抗压强度具有显著的弱化作用，随钻孔数目的增加，煤岩动态抗压强度分别下降11.9%、20.4%、23.2%；随钻孔间距的增加，动态抗压强度分别下降20.4%、14.9%、8.5%、16.4%。含钻孔煤样应力-应变曲线存在应力跌落现象与塑性耗能平台期，应力跌落范围与塑性平台范围随孔数目的增加呈上升趋势。高应变率加载下钻孔对煤样的破坏具有明显的变形局部化引导作用，煤岩破坏时，初始主裂纹于平行加载方向的孔边拉应力区产生，次裂纹垂直主裂纹方向，孔间裂纹于孔桥间产生。应力集中区随孔桥破碎重新分布，孔边承载区远离钻孔。钻孔后煤样的AE事件数峰值出现不同程度的后移，当L≤2.5d时，AE事件分布呈双峰特征，L＞2.5d时，AE事件分布呈单峰特征。

Abstract

Coal seam drilling is a simple, economical and effective means of impact damage reduction and mitigation. In view of the high strain rate loading after the occurrence of impact pressure, revealing the physical process of impact damage of drilled coal rock and its mitigation mechanism is of great significance for quantitatively designing the parameters of coal seam drilling. In order to study the influence of boreholes under high strain rates on the mechanical properties of coal samples, impact tests were carried out on prefabricated borehole coal samples through indoor SHPB tests and numerical simulation of particle flow. The experimental results show that borehole under high strain rate loading has a significant weakening effect on the dynamic compressive strength of coal samples, with the increase of the number of boreholes, the dynamic compressive strength of coal rock decreases by 11.9%, 20.4%, and 23.2%, respectively; and with the increase of the spacing of drilling holes, the dynamic compressive strength decreases by 20.4%, 14.9%, 8.5%, and 16.4%, respectively. The stress-strain curves of coal samples containing drill holes have a stress drop phenomenon and plastic energy consumption platform period, and the stress drop range and plastic platform range show an upward trend with the increase of the number of holes. The destruction of coal samples by borehole under high strain rate loading has obvious deformation localization guiding effect; when the coal rock is destroyed, the initial primary cracks are generated in the tensile stress area of the hole edge in the parallel loading direction, the secondary cracks are perpendicular to the direction of the primary cracks, and the inter-hole cracks are generated in the inter-hole bridges. The stress concentration zone redistributes with the breakup of the hole bridges, and the hole-side bearing zone is far away from the borehole. The peaks of AE event numbers of coal samples after drilling showed different degrees of backward shift, and the distribution of AE events was characterized by bimodal peaks when L≤2.5d, and single peaks when L>2.5d.

导出引用

张寅1，尹立冬1，代连朋2，张季平1，李家俊1，杨晨晨1. 高应变率下钻孔煤样冲击破坏试验及数值研究[J]. 振动与冲击, 2024, 43(9): 309-320

ZHANG Yin1,YIN Lidong1, DAI Lianpeng2, ZHANG Jiping1, LI Jiajun1, YANG Chenchen1. Test and numerical study on impact failure of drilling coal samples under high strain rate[J]. Journal of Vibration and Shock, 2024, 43(9): 309-320

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