冻融扰动耦合作用下露天矿边坡断层破碎带岩体变形失稳规律研究

Deformation and Instability Law of the Rock Mass in Fault Fractured Zone of the Open-Pit Slope Under the Coupling Action of Freeze-Thaw

为研究处于高海拔高寒地区的新疆某露天铁矿边坡断层破碎带岩体的变形失稳规律,采用FLAC3D软件模拟分析了冻融循环作用及工程爆破扰动对矿山边坡断层破碎带稳定性的劣化效应。结果表明:随着冻融循环次数的增加,含断层破碎带边坡的塑性区范围不断增大。冻融循环0,20,40次和60次时求解得到的边坡安全稳定性系数分别为1.70,1.53,1.31和1.14,表明冻融循环次数越多,边坡安全稳定性系数越低。不同冻融循环次数下,含断层破碎带边坡模型在右帮大边坡靠上半部分的位置产生了水平位移最大值,在右帮大边坡中部位置产生了竖向位移最大值。在施加爆破扰动波后,随着冻融循环次数的增加,断层破碎带的振动速度和位移不断增大;监测点越靠近爆源位置,位移和振动速度受到的影响越大。

In order to investigate the deformation and instability law of rock mass in the fault fractured zone of an open-pit iron mine slope in Xinjiang in high-altitude and cold area,FLAC3D software was used to simulate and analyze the deterioration effect of freeze-thaw cycle and engineering blasting disturbance on the stability of the fault fractured zone of mine slope.The results show that with the increase of freeze-thaw cycles,the plastic zone of the slope with fault fractured zone is increasing.The safety stability coefficients of the slope are 1.70,1.53,1.31 and 1.14 respectively when the freeze-thaw cycles are 0,20,40 and 60 times,indicating that the more the freeze-thaw cycles,the lower the safety stability coefficient of the slope.Under different freeze-thaw cycles,the slope model with fault fractured zone produces the maximum horizontal displacement at the upper half of the right slope,and the maximum vertical displacement at the middle of the right slope.After the blasting disturbance wave is applied,the vibration velocity and displacement of the fault fractured zone increase with the increase of the freeze-thaw cycles.The closer the monitoring points are to the location of the explosion source,the greater the impact on the displacementandvibrationvelocity.