| 应用离散元强度折减对复杂边坡进行稳定性分析 |
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| 引用本文： | 宁 宇,徐卫亚,郑文棠.应用离散元强度折减对复杂边坡进行稳定性分析[J].岩土力学,2007,28(Z1):569-574. |
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| 作者姓名： | 宁 宇 徐卫亚 郑文棠 |
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| 作者单位： | 河海大学 岩土工程研究所，南京 210098 |
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| 基金项目： | 国家重点基础研究发展规划项目（973项目）（No.2002CB412707）；国家自然科学基金（No.50539110）资助。 |
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| 摘 要： | 介绍了离散元（DEM）及强度折减法基本原理，利用3DEC软件结合强度折减法对某水电站高边坡进行稳定性分析。对岩体强度参数进行折减，以关键点位移与时间关系曲线发散时的折减系数作为边坡安全系数，根据位移矢量图确定滑面和破坏形态。通过与Dijkstra极限平衡有限元法及Sarma法的计算结果对比，验证该方法的可靠性。在二维计算基础上建立并简化三维模型，模拟边坡三维应力场。结合工程关注区域的应力及位移趋势，采用3DEC中的辅助节理截取典型坡段单宽模型，在已有的三维应力场的基础上对其进行强度折减，弥补了二维强度折减未考虑三维应力场对边坡稳定性影响的不足，把握了工程重点及力学特性，为类似工程提供了一种合理高效的稳定性分析手段。
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| 关 键 词： | 岩质边坡 结构面 离散元 3DEC 强度折减法 Dijkstra 辅助节理 三维应力场 |
| 收稿时间： | 2007-04-11 |
Application in complicated high slope with strength reduction method based on discrete element method |
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| NING Yu,XU Wei-ya,ZHENG Wen-tang.Application in complicated high slope with strength reduction method based on discrete element method[J].Rock and Soil Mechanics,2007,28(Z1):569-574. |
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| Authors: | NING Yu XU Wei-ya ZHENG Wen-tang |
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| Institution: | Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | The basic principles of discrete element method and strength reduction method are introduced. The method of combining the 3DEC and strength reduction method is presented and applied to the stability analysis of a high slope of a hydropower station. The reduction coefficient in divergence stage of key points’ displacement-time curve is defined as the slope safety coefficient, and the critical slip surface and failure mode can be determined according to the velocity vector of a slope. Numerical results presented in the paper indicate that this method is reliable for jointed rock slope stability analysis compared with the Dijkstra limit equilibrium FEM and classical LEM method. For no considering the 3D initial ground stress field in 2D common SRM, based on the 2D analytical results, the 3D generalized geological model is set up to get the 3D stress field. According to the analysis of the stress distribution and the main problems in the project, the specific geological model with unit width is set up by the auxiliary joint in the 3DEC. Based on the 3D stress field, the SRM is carried out. The new method takes consideration of the influence of the 3D stress filed of the slope stability and bas made up the shortcoming of 2D common SRM. This method is a rational and efficient stability analysis method and is worth using in similar projects. |
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| Keywords: | rock slope structure plane discrete element method 3DEC strength reduction method Dijkstra auxiliary joint |
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