不同饱水条件下蚀变岩边坡稳定性分析
露天矿坑蓄水后,边坡岩体长期处于浸水状态,导致岩石抗剪强度产生弱化,对边坡的稳定性产生不利影响。为分析不同饱水条件对边坡蚀变岩抗剪强度参数的影响,对仓上金矿露天矿蚀变岩试件分别进行0、8、20、35、60、100d的饱水处理。由饱水岩样的常规三轴试验结果可得,在不同酸性环境、不同饱水时间条件下,蚀变岩的内摩擦角和粘聚力产生明显的损伤弱化,饱水时间弱化作用强于浸水溶液的酸性状态。饱水时间大于60d后,抗剪强度参数的降低幅度明显减小,饱水时间产生的弱化作用是一定的。根据不平衡推力法对划分露天边坡条块,求解边坡的安全系数,随着饱水时间的增加和浸水溶液酸性的增强,边坡的安全系数呈现显著降低趋势,边坡发...
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| Published in | 地质与勘探 Vol. 53; no. 1; pp. 151 - 156 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
2017
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0495-5331 |
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| Summary: | 露天矿坑蓄水后,边坡岩体长期处于浸水状态,导致岩石抗剪强度产生弱化,对边坡的稳定性产生不利影响。为分析不同饱水条件对边坡蚀变岩抗剪强度参数的影响,对仓上金矿露天矿蚀变岩试件分别进行0、8、20、35、60、100d的饱水处理。由饱水岩样的常规三轴试验结果可得,在不同酸性环境、不同饱水时间条件下,蚀变岩的内摩擦角和粘聚力产生明显的损伤弱化,饱水时间弱化作用强于浸水溶液的酸性状态。饱水时间大于60d后,抗剪强度参数的降低幅度明显减小,饱水时间产生的弱化作用是一定的。根据不平衡推力法对划分露天边坡条块,求解边坡的安全系数,随着饱水时间的增加和浸水溶液酸性的增强,边坡的安全系数呈现显著降低趋势,边坡发生滑坡的概率逐渐增大。试验与理论研究结果可以更好的为露天矿边坡的支护设计提供重要依据。 |
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| Bibliography: | When slope rock mass is immersed in water for a long time after impoundment,its slope stability can be gradually reduced. In order to analyze the effects of different saturated conditions on this process of the Cangshang gold mine opencast,altered rock specimens were placed in saturated water for 0,8,20,35,60,100 days,respectively. The conventional tri- axial tests on water- saturated rock samples show that in different acidic environments and varied water saturated conditions,altered rocks in the angle of internal friction and cohesion of altered rocks can suffer significant damage and weakening,while the saturated water weakening effect is stronger than that of the acidic solution in soaking water. After water saturation time exceeds 60 days,the reduction amplitude of shear strength drops significantly,implying limited weakening of saturated water. According to the rule of unbalanced thrust,the open- pit slope is divided into slivers and blocks. Their resolved safety coefficients demonstrate that with incre |
| ISSN: | 0495-5331 |