| 某公路桥桥基区岩质边坡稳定性评价 |
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| 引用本文： | 杨红喜.某公路桥桥基区岩质边坡稳定性评价[J].中国地质灾害与防治学报,2009,20(2):20-23. |
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| 作者姓名： | 杨红喜 |
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| 作者单位： | 水利部山西水利水电勘测设计研究院,山西,太原,030024 |
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| 摘 要： | 该公路桥桥基区位于高山峡谷地区,边坡稳定性评价问题尤为重要。本文选择具有代表性的两类典型地质剖面,岩土体分层和结构面切割控制滑移模式。设计了结构面不同切割厚度、不同剪出口位置和不同剪出角度等计算方案,对该区高陡边坡的稳定性进行了探讨。根据计算得到的安全系数,确定了其最不利滑移模式。在此基础上,对其自然状态、自然＋地震、饱水状态和饱水＋地震等工况下的稳定性进行了计算分析,发现存在两类典型最不利失稳模式,即浅层滑移模式和结构面切割滑移模式。前者规模有限,危害不大;后者规模相对较大。对工程危害较大,建议对其作锚固和护面处理,也应对坡脚相对软弱层作补强处理。
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| 关 键 词： | 岩质边坡 稳定性评价 结构面 安全系数 公路桥基 |
Evaluation of stability of the rock slope in the highway bridge base region |
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| YANG Hong-xi.Evaluation of stability of the rock slope in the highway bridge base region[J].The Chinese Journal of Geological Hazard and Control,2009,20(2):20-23. |
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| Authors: | YANG Hong-xi |
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| Institution: | YANG Hong-xi (Shan-xi Hydro-electric ＆ Water Resources Investigation and Design Institute, Ministry of Water Resources, Taiyuan 030024, China) |
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| Abstract: | The base of the highway bridge locates in alpine valley region.Its slope stability problem is particularly important.Two kinds of typical geological section ale selected to discuss the stability of the high and steep slope.It obtains rock and soil stratification and fissure plane slipping mode.The computing schemes such as different thickness cutting by fissure plane,different shearing location and shearing angle are designed to study its stability.According to the safety factor calculated,the worst slipping mode is determined.Based on these,its stability under natural condition,natural and seismic condition,saturated condition,saturated and seismic condition is analyzed.It is found that there lives two types of unstable mode,one is shallow slipping mode,the other is fissure plane cutting slipping mode.The scale of the former is limited,so its damage is little.Vice versus,the damage of the latter is notable for its large scale.So the engineering strengthening measure should be taken. |
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| Keywords: | rock slope stability evaluation structural plane safety factor bridge foundation of highway |
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