动静载荷作用下红砂岩力学性能试验研究

    Experimental Research on Mechanics Properties of Red Sandstone Under Dynamic and Static Loads

    • 摘要: 利用MTS810电液伺服材料试验系统和霍普金森压杆试验系统(SHPB)分别研究红砂岩材料动、静载荷作用下应力-应变全过程曲线、破坏特征,并将2种状态下的试验结果进行了对比。研究表明:动载荷曲线较静载荷曲线在压密阶段之前存在局部变形阶段;动载荷作用下,当应变率大于66 s-1时,红砂岩应力-应变曲线表现出一个与静载作用下相似的软化阶段;而当应变率未达到66 s-1时,红砂岩在裂纹处发生明显的脆性崩裂;红砂岩在静载下为沿断裂面的滑移破坏,在动载下为轴向劈裂破坏。

       

      Abstract: The stress-strain curve and destruction features of red sandstone under dynamic and static loads are researched by MTS 810 electrohydraulic servo material testing system and the split Hopkinson pressure bar (SHPB) test system, and the test results of dynamic and static state are compared. The results show that compared to static load, dynamic load curve will deform partly before compaction stage; when strain rate is more than 66 s-1,red sandstone stress-strain curve shows a softening stage which is similar to static load, but when strain rate did not reach 66 s-1,red sandstone occurs brittle fracture at cracks; under the static load, the destruction of red sandstone is the sliding failure along fracture face, and under dynamic load the destruction of red sandstone is axial fracturing.

       

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