Analysis on the response of the dip slope with weak layer to earthquake
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摘要: 以抚顺西露天矿南帮含弱层顺向坡作为参考原型，利用FLAC3D软件模拟实际地震动及地震动输入、斜坡模型的边界条件、岩体参数以及网格模型划分，对含弱层顺向坡进行数值模拟计算，通过监测点的加速度和速度探讨含弱层顺向坡在地震作用下的响应规律。研究结果表明：（1）地震作用下对于含单一弱层斜坡响应特征起到决定性的影响因素是弱层的厚度，在地震荷载作用下影响斜坡的稳定程度要大于单一弱层倾角的影响。（2）通过弱层与斜坡坡面的相交部位监测点2#在水平方向速度可以得出，厚度对于X方向的速度大小影响程度较大。（3）对于地震作用下双弱层特性斜坡的响应规律分析时，弱层与斜坡相交部位的破坏响应规律会随着坡高的增大而有所变化，双弱层监测点3#的加速度幅值变化及速度变化程度均比双弱层监测点2#明显。地震作用下顺向坡的响应规律与含有弱层的倾角、厚度和弱层的数量位置有关，在对斜坡的治理与防护的过程中应当充分考虑地震与弱层特性的耦合作用对斜坡稳定性的影响。Abstract: Taking the down-slope with weak strata in the south of Fushun west open-pit mine as the reference prototype, numerical simulations of the down-slope with weak strata were conducted through FLAC3D software, which included the simulation of actual ground motion and ground motion input, the boundary conditions of slope model, rock mass parameters, and grid model division. The response rule of down-slope with weak strata under an earthquake was investigated by analyzing the acceleration and velocity of the monitoring points. The results revealed that: (1) The thickness of the weak layer is a critical factor affecting the response characteristics of the slope with a single weak layer under an earthquake, and it has a greater impact on the stability of the slope under earthquake load than the dip angle of a single weak layer. (2) Based on the horizontal velocity of monitoring point 2# at the intersection of the weak layer and the slope surface, it was concluded that the thickness has a significant influence on the velocity in the X direction. (3) The failure response law at the intersection of weak layers and slope changes with an increase in slope height when analyzing the response law of the double weak layer characteristic slope under an earthquake. The acceleration amplitude and velocity change degree of monitoring point 3# with double weak layers are more noticeable than that of monitoring point 2#. The response law of the down-slope under an earthquake is related to the dip angle, thickness, number, and location of weak layers. Therefore, the coupling effect of earthquake and weak layer characteristics on slope stability should be thoroughly considered in the process of slope treatment and protection.
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Key words:
- weak layer /
- dip slope /
- earthquake action /
- response law
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图 5 不同倾角监测点2#的加速度和速度时程曲线
Figure 5. Time history curves of acceleration and velocity at monitoring point 2# with different dip angles
图 6 不同厚度监测点2#的加速度和速度时程曲线
Figure 6. Time history curves of acceleration and velocity at monitoring point 2# with different thicknesses
图 7 双弱层不同倾角监测点2#的加速度和速度时程曲线
Figure 7. Time history curves of acceleration and velocity at monitoring point 2# with different dip angles for double weak layer
图 8 双弱层不同倾角监测点3#的加速度和速度时程曲线
Figure 8. Time history curves of acceleration and velocity at monitoring point 3# with different dip angles in double weak layer
图 9 双弱层不同厚度监测点2#的加速度和速度时程曲线
Figure 9. Time-history curves of acceleration and velocity at monitoring point 2# with different thicknesses in double weak layer
图 10 双弱层不同厚度监测点3#的加速度和速度时程曲线
Figure 10. Time history curves of acceleration and velocity at monitoring point 3# with different thicknesses of double weak layer
表 1 岩体材料力学参数
Table 1. Mechanical parameters of rock mass materials
介质 密度
/（kg·m−3）弹性模量
/GPa泊松比 黏聚力
/MPa内摩擦角
/（°）抗拉强度
/MPa岩体 2900 10 0.20 0.20 39.0 3.5 软弱夹层 2400 1.076 0.30 0.22 21.6 0.75 
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