循环冲击作用下围压对斜长角闪岩动态特性的影响研究

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振动与冲击 ›› 2010, Vol. 29 ›› Issue (8) : 60-63,7.

论文

循环冲击作用下围压对斜长角闪岩动态特性的影响研究

许金余1,2;吕晓聪1,3;张军3;刘军忠1;白二雷1

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RESEARCH ON DYNAMIC MECHANICAL PERFORMANCE OF AMPHIBOLITE UNDER CYCLICAL IMPACT LOADINGS AT DIFFERENT CONFINING PRESSURES

XU Jinyu1,2;LV Xiaocong1,3;Zhang jun3;Liu junzhong1;Bai erlei1

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摘要

利用带围压装置的直径为100mm的霍普金森压杆设备对围压条件下斜长角闪岩在循环冲击作用下动态力学性能进行试验研究，分析了斜长角闪岩的应力－应变曲线随冲击荷载循环作用次数的变化特性、动态杨氏模量与围压和应变率之间的关系，以及斜长角闪岩的能量吸收率与应变率和围压等参量之间的关系。研究结果表明，在围压和冲击荷载一定的情况下，随着冲击荷载循环作用次数的增加，岩石的杨氏模量变小。岩石破坏面上的正应力随围压的增加而增加，在裂隙摩擦滑移的作用下，围压状态下岩石的破裂面上会产生明显的粉末状岩粉。在吸收能量相同的情况下，围压越高，岩石破坏时形成的损伤面的面积越小，破碎程度越低。相同围压等级情况时，斜长角闪岩的能量吸收率随着应变率的增加而提高；当应变率相同时，斜长角闪岩的能量吸收率随围压的增加而减小。得到了能量吸收率随应变率和围压变化的关系式。

Abstract

Dynamic mechanical performance experiments are carried out for amphibolite specimens under the cyclical impact loadings by using the SHPB. It is analysed about the relationships between the change of stress-strain curves and the cyclical action times of impact load, and among the dynamic modulus, strain rates and confining pressures. It is demonstrated that the Young’s modulus of amphibolite decreases along with the increase of cyclical action times of impact load, when the confining pressure and impact loading are fixed. The normal stress on rupture surface enhances with the increase of confining pressure, and white rock powder will come forth on the rupture surface under the action of cranny’ friction and slippage. When the rock specimen was shattered and the accumulative absorption energy is equivalent, the higher confining pressure is, the smaller the total areas of rupture is. Energy absorbency ratio increases with the augment of the strain rate, and decreases with the augment of confining pressure. The formulas are putted forward among the energy absorbency ratio, strain rate and the confining pressure.

导出引用

许金余;吕晓聪;张军;刘军忠;白二雷. 循环冲击作用下围压对斜长角闪岩动态特性的影响研究[J]. 振动与冲击, 2010, 29(8): 60-63,7

XU Jinyu;LV Xiaocong;Zhang jun;Liu junzhong;Bai erlei. RESEARCH ON DYNAMIC MECHANICAL PERFORMANCE OF AMPHIBOLITE UNDER CYCLICAL IMPACT LOADINGS AT DIFFERENT CONFINING PRESSURES[J]. Journal of Vibration and Shock, 2010, 29(8): 60-63,7