一维动静组合加载下深部石英片岩破坏研究

为研究锡铁山铅锌矿深部石英片岩的力学特性,利用分离式霍普金森杆(SHPB)对埋深863¹ 264m的试样进行25、30、35MPa轴压下的一维动静加载实验,和采用LS-DYNA软件模拟了25、30、35、40、45、50 MPa轴压情况下的冲击实验。研究结果表明:在冲击作用下,试样的一维动态抗压强度和破坏所需的入射能随着埋深的增加而增加,并呈现出常见的压剪破坏模式;当轴压40MPa左右,埋深1 428m的岩石动态抗压值达到最大;当轴压低于40 MPa时,轴压的增大能加强试样的抗压能力;当轴压大于40MPa时,轴压的增加反而减弱了试样的抗压能力。

Destruction of deep quartz schist under one-dimensional dynamic and static combination loading

With the purpose to investigate the mechanical properties of deep quartz schist in Xitieshan lead-zinc mine,the author adopt SHPB in the test of one-dimensional coupled static and dynamic loading,by forcing 25,30,35 MPa axial compression upon specimens extracted from 863—1 264 m,also the LS-DYNA software is utilized to simulate the impact tests with six different axial compression including 25,30,35,40,45,50 MPa.The results show that the one-dimensional dynamic compressive strength and the incident energy to failure of the specimens increase with the increasing of depth under the tests,and the compression and shear failure mode presents in common;also the results state clearly that the dynamic pressure is the strongest of those specimens in the depth 1 428 mwith the axial pressure is around 40 MPa;when the axial pressure is lower than 40 MPa,the specimens' compressive strength enhances with the increasing of axial compression.However,the specimens' compressive strength weakens when the axial compression is increasing when the axial pressure is greater than 40 MPa.