不同应变率下岩-煤-岩组合体冲击动力试验研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (17) : 137-143.

论文

苗磊刚1，2，牛园园3，石必明1

作者信息 +

Impact dynamic testsfor rock-coal-rock combination under different strain rates

MIAO Leigang1,2,NIU Yuanyuan3, SHI Biming1

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文章历史 +

摘要

为了研究岩-煤-岩组合体动态力学性质，利用直径为75mm的分离式霍普金森压杆（SHPB）在5种不同应变率下对组合体试件进行单轴动态冲击压缩试验。研究结果表明：气压与子弹速度之间、冲击速度与应变率之间、应变率与动态弹性模量之间、应变率与动态抗压强度之间、应变率与分维数值之间都近似呈线性关系；σ-ε曲线在近似直线上升到峰值应力的75%左右时，随着应力的增加，曲线斜率逐渐降低，直至达到应力峰值，试件破碎后，呈现跳崖式下降现象；岩-煤-岩组合体在应变率较低时沿着加载方向轴向劈裂破坏，但伴随着应变率的升高，岩块分布也逐渐呈现细粒化，破碎程度也随之增强，块度分维数值也呈线性升高。

Abstract

Here, in order to study dynamic properties of a rock-coal-rock combination,uniaxial dynamic impact compression tests were conductedfor the combination specimen using a split Hopkinson pressure bar (SHPB) with diameter of 75 mm under 5 different strain rates.The results showed that relations between air pressure and bullet velocity, bullet velocity and strain rate, strain rate and dynamic elastic modulus, strain rate and dynamic compressive strength as well as strain rate and fractal dimension areapproximately linear, respectively;when the specimen’s σ-ε curve rises almostlinearly to about 75% of peak stress, with increase in stress, the curveslope gradually decreases until reaching peak stress;after the specimen is broken, the curve hasa precipice-like descent; the rock-coal-rock combination splits axiallyin loading direction during lower strain rate; but with increase in strain rate,distributionof rock blocks is gradually fine-grained;with increase in its broken degree, rock block fractal dimension rises linearly.

关键词

岩-煤-岩组合体

/ 应变率 / 分离式霍普金森压杆 / 动态力学 / 分维数

Key words

Rock-coal-rock combination / Strain rate / Split Hopkinson pressure bar / Dynamic mechanics / Fractal dimension

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苗磊刚1，2，牛园园3，石必明1. 不同应变率下岩-煤-岩组合体冲击动力试验研究[J]. 振动与冲击, 2019, 38(17): 137-143

MIAO Leigang1,2,NIU Yuanyuan3, SHI Biming1. Impact dynamic testsfor rock-coal-rock combination under different strain rates[J]. Journal of Vibration and Shock, 2019, 38(17): 137-143

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