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摘要:
抚顺西露天矿由于长期开采造成地底岩层出露，形成众多顺倾多弱层岩质边坡。鉴于目前对于地震作用下顺倾多弱层岩质边坡的研究较少，选择抚顺西露天矿南帮E1000处顺倾多弱层岩质边坡，分析地震作用下多弱层对边坡动力响应的影响。利用有限差分软件对边坡进行数值建模，分析真实地震动作用下边坡不同弱层的动力响应变化规律，并将双弱层、单一弱层和无弱层四种情况进行对比，发现不同弱层的动力响应和对边坡的影响程度不同，位于边坡下部的弱层无高程放大效应但对边坡起主导作用，与坡面共线的弱层存在趋表放大效应和高程放大效应但对边坡无明显影响。双向地震动对顺倾多弱层边坡的弱层和坡面放大效应不受影响，Z（垂直）方向的加速度和速度显著增加，双向地震动作用下边坡的速度分布差异明显，但位移分布无显著变化。地震作用下顺倾多弱层边坡的动力响应规律与弱层的分布位置和作用机理有关，在边坡的防护和治理过程中应充分考虑弱层对边坡的影响。
Abstract:The long-term mining of the Fushun West Open-pit Mine has resulted in the exposure of underground rock layers, forming numerous down-dip and weak-layer rock slopes. In view of only few studies on the down-dip and multi-weak layer rock slopes under earthquakes, selected the down-dip multi-weak layer rock slope at E1000 in the south bank of the Fushun West Open-pit Mine, the paper analyzed the influence of multiple-weak layers on the dynamic response of the slope under earthquake action. The finite difference software is used to model the slope numerically and analyze the dynamic response of different weak layers of the slope under the real seismic action. Then by comparing the cases of double weak layers, single weak layer and no weak layer, found that different weak layers have different dynamic response and the degree of influence on the slope is also different. The weak layer located at the lower part of the slope has no elevation amplification effect but plays a dominant role in the slope. The weak layer collinear with the slope surface has the surface amplification effect and the elevation amplification effect but hasn’t obvious impact on the slope. Bidirectional ground motions has not affected the weak layers and slope magnification effect of the numerous down-dip and weak-layer slopes. The acceleration and velocity in the Z (vertical) direction increase significantly. The velocity distribution of the slope under the action of bidirectional ground motion has obvious difference, but the displacement distribution does not change significantly.The dynamic response law of numerous down-dip and weak-layer slopes under the action of earthquakes is related to the location and mechanism of the weak layers.The influence of weak layers on the slope should be fully considered in the protection and treatment of slopes.
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Key words:
- multiple weak layers /
- rocky slope /
- earthquake action /
- dynamic response
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表 1 岩体物理力学参数
Table 1. Physical and mechanical parameters of rock mass
岩土体分类 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花岗片麻岩 2900 10 0.20 0.20 39.0 3.5 玄武岩 2600 11.9 0.17 1.81 37.2 2.5 回填物料 2040 0.450 0.32 0 25.0 0.2 凝灰岩 2590 17.6 0.17 4.61 38.6 2 弱层（破碎带） 2400 1.076 0.30 0.22 21.6 0.75 
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