不同内径圆环砂岩试件温水耦合动态劈裂力学试验研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (17) : 43-51.

论文

平琦1，2，3，高祺2，3，王晨2，3

作者信息 +

Mechanical test study on thermo-water coupled dynamic splitting of annular sandstone specimens with different inner diameters

PING Qi1,2,3, GAO Qi2,3, WANG Chen2,3

Author information +

文章历史 +

摘要

煤矿巷道围岩经常处于地下水和温度共同作用环境中。由于岩石动抗拉强度远小于其动抗压强度，当受到掘进爆破等动载作用时岩体破坏往往取决于动抗拉强度，温水耦合岩石在动荷载扰动下动态抗拉力学性能值得深入研究。对不同内径圆环砂岩试件（外径50mm，内径0~25mm）进行温水耦合作用，开展X射线衍射（XRD）和扫描电子显微镜（SEM）试验，并利用霍普金森压杆试验装置（SHPB）进行动态劈裂力学特性试验研究。结果表明：温水耦合作用使砂岩试件产生损伤劣化，基本物理参数发生变化，动力学性能呈现出弱化现象；相同加载条件下，圆环砂岩试件内径增大，试件更易发生张拉破坏；劈裂后的半圆环发生了挤压断裂；相同内径时，温水耦合作用砂岩试件碎块更加明显；从能量耗散角度对试件破碎形态进行分析。

Abstract

The surrounding rock of coal mine roadway is often in the environment of the interaction of groundwater and temperature. Since the dynamic tensile strength of rock is much smaller than its dynamic compressive strength, the failure of rock mass under dynamic load, such as excavation blasting, often depends on the dynamic tensile strength. Therefore, the dynamic tensile properties of warm-water coupled rock under dynamic load disturbance are worthy of further study. The circular sandstone specimens with different inner diameters (outer diameter 50mm, inner diameter 0-25mm) were subjected to warm water coupling. The X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) tests were carried out, and the dynamic splitting mechanical properties were investigated by using Split the Hopkinson Pressure Bar test device (SHPB). The results show that the coupling effect of warm water causes damage and deterioration of sandstone specimens, changes of basic physical parameters, and weakens the dynamic properties. Under the same loading conditions, the inner diameter of the ring sandstone specimen increases and the specimen is more prone to tensile failure. After the split, the half ring has extrusion fracture. When the inner diameter is the same, the coupling effect of warm water is more obvious. The breakage form of the specimen is analyzed from the Angle of energy dissipation.

导出引用

平琦1，2，3，高祺2，3，王晨2，3. 不同内径圆环砂岩试件温水耦合动态劈裂力学试验研究[J]. 振动与冲击, 2023, 42(17): 43-51

PING Qi1,2,3, GAO Qi2,3, WANG Chen2,3. Mechanical test study on thermo-water coupled dynamic splitting of annular sandstone specimens with different inner diameters[J]. Journal of Vibration and Shock, 2023, 42(17): 43-51

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