| 沪蓉西马水河大桥岸坡稳定性评价 |
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| 引用本文： | 王国斌.沪蓉西马水河大桥岸坡稳定性评价[J].岩土力学,2010,31(Z1):261-265. |
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| 作者姓名： | 王国斌 |
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| 作者单位： | 湖北省交通规划设计院,武汉,430051;中国地质大学,工程学院,武汉,430074 |
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| 摘 要： | 马水河大桥是沪蓉国道主干线关键性工程,大桥桥头边坡地质条件复杂,构造发育,边坡整体稳定性对大桥施工和安全运行影响很大,但其整体稳定性非常难以判断。如何在计算中反映马水河大桥岸坡的地质结构、岩体结构特征及岩体结构面网络以及变形破坏模式,是决定岸坡稳定性分析结果客观性的重要因素。基于岸坡地质条件、地质结构和岩体结构面网络模拟的有限差分数值分析方法和数值分析模型,分别模拟了边坡在天然状态下、桥荷载作用下及水位升高50m情况下的应力状态和变形大小。研究结果表明,在桥荷载作用下,斜坡应力场局部影响较大,深度达50m,因此建议桩基设计时应加大桩基断面尺寸以改善桩体承载力。
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| 关 键 词： | 马水河大桥 边坡 结构面网络 稳定性 数值分析 |
| 收稿时间： | 2010-04-25 |
Slope stability analysis of Mashui River large bridge for Shanghai-Chengdu national trunk highway |
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| WANG Guo-bin.Slope stability analysis of Mashui River large bridge for Shanghai-Chengdu national trunk highway[J].Rock and Soil Mechanics,2010,31(Z1):261-265. |
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| Authors: | WANG Guo-bin |
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| Institution: | 1. Communications Planning and Design Institute of Hubei Province, Wuhan 430051, China; 2. School of Engineering, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | Mashui River large bridge is a key project of the Shanghai-Chengdu national trunk highway; the slope stability of Mashui River large bridge is difficult to be evaluated due to the complex geological conditions and tectonic evolution. How to reflect the geological conditions and tectonic evolution in slope stability analysis is very important for the result objectivity. According to the geological structure and tectonic character of rock mass, the author summarized the deformation and failure mode of the slope. On the basis of the failure mode, the numerical model with finite difference method was built. The stress and deformation state were simulated with the slope under three states, such as in natural state, the action of a bridge and the 50 meters rising of water level. The results indicate that the slope stress field changes very much locally and the influence depth reaches 50 meters. Therefore, an increased cross-section of pile foundation is suggested to improve its bearing capacity. |
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| Keywords: | Mashui River large bridge slope network map of structural plane stability numerical simulation |
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