| 悬臂式抗滑桩加固黏土边坡地震永久位移算法 |
| |
| 引用本文： | 肖世国,祝光岑.悬臂式抗滑桩加固黏土边坡地震永久位移算法[J].岩土力学,2013,34(5):1345-1350. |
| |
| 作者姓名： | 肖世国 祝光岑 |
| |
| 作者单位： | 1. 西南交通大学 地质工程系，成都 610031；2. 西南交通大学 岩土工程系，成都 610031 |
| |
| 基金项目： | 中央高校基本科研业务费专项资金(No. SWJTU11CX060)；四川省交通科技项目(No. 2011D-03-2)。 |
| |
| 摘 要： | 为了有效地确定悬臂式抗滑桩加固的黏土边坡地震永久位移，基于极限分析上限定理，针对圆弧滑动式土坡破坏模式，通过对设置抗滑桩条件下土坡进行外力功率和内能耗散率的计算，按严格力学定义推导出坡体在地震作用下的安全系数，进而导出与安全系数相对应的边坡地震屈服加速度计算公式，并结合Newmark滑块位移法对边坡产生的转动加速度进行二次积分，推导出与边坡设计安全系数密切相关的坡体地震永久位移的详细计算公式。以5.12汶川地震卧龙测站东向地震波为例，通过对一算例边坡进行分析，给出了边坡永久位移时程曲线以及不同设计安全系数与永久位移的关系，分析了算法与Ambraseys算法的结果，验证了所提计算方法的有效性，并得到不同设计安全系数时边坡土体黏聚力和内摩擦角对坡体永久位移的影响规律。研究结果表明，坡体永久位移随着设计安全系数的增加逐渐呈指数函数式减小变化，在较低设计安全系数下，坡体永久位移受土体抗剪强度参数影响较为敏感，随着设计安全系数的提高，这种敏感性则逐渐降低。
|
| 关 键 词： | 黏土边坡 悬臂式抗滑桩 设计安全系数 屈服加速度 永久位移 |
| 收稿时间： | 2012-03-04 |
Seismic permanent displacement of clay slopes reinforced with cantilever stabilizing piles |
| |
| XIAO Shi-guo,ZHU Guang-cen.Seismic permanent displacement of clay slopes reinforced with cantilever stabilizing piles[J].Rock and Soil Mechanics,2013,34(5):1345-1350. |
| |
| Authors: | XIAO Shi-guo ZHU Guang-cen |
| |
| Institution: | 1. Department of Geological Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. Department of Geotechnical Engineering, Southwest Jiaotong University, Chengdu 610031, China |
| |
| Abstract: | In order to get the seismic permanent displacement of clay slope reinforced with cantilever stabilizing piles effectively, based on the upper bound theorem of limit analysis and circular failure mode of soil slope, factor of safety and the corresponding yield acceleration of slope with stabilizing piles under the earthquake can be derived through calculating the rate of work done by external loads and the energy dissipation rate. Then, combined with the Newmark’s sliding block method, the expression for the seismic permanent displacement related to design safety factor can be deducted by the double integrals of the rotational acceleration of slope. The paper takes a clay slope reinforced with cantilever stabilizing piles under the 5.12 Wenchuan Earthquake for example, the validity of the proposed method is verified by comparison with Ambraseys’s method. In Addition, the permanent displacement time history of the reinforced slope is given, and the relationship between the permanent displacement and factor of safety of the slope is also shown. The laws that the permanent displacement affected by the cohesion and internal friction angle of soil under different safety conditions are obtained. The research results show that the permanent displacement exponentially decreases with design safety factor of the slope increasing. In the case of lower design safety factor, the permanent displacement is more sensitive to soil shear strength parameters. However, the sensitivity is gradually reduced with the increase of the design safety factor. |
| |
| Keywords: | clay slope cantilever stabilizing pile design safety factor yield acceleration permanent displacement |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
