| 基于上限法的条形锚板抗拔承载力分析 |
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| 引用本文： | 余生兵,黄茂松.基于上限法的条形锚板抗拔承载力分析[J].岩土力学,2010,31(Z2):160-163. |
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| 作者姓名： | 余生兵 黄茂松 |
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| 作者单位： | 1. 同济大学 地下建筑与工程系，上海 200092；2. 同济大学 岩土及地下工程教育部重点实验室，上海 200092 |
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| 基金项目： | 国家杰出青年科学基金项目（No. 50825803）；上海市优秀学科带头人计划项目（No. 09XD1403900）。 |
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| 摘 要： | 以极限分析上限理论为基础,利用旋转块体集的组合来构造条形锚板的运动许可速度场。分析了不排水黏土中深埋和浅埋条形锚板的抗拔承载力上限解,研究了锚板在不同埋置倾角和深度条件下的抗拔承载力和破坏面的特性,并将计算结果与已有计算方法进行了对比。分析结果表明:在不排水黏土中深埋条形锚板抗拔承载力与锚板的埋置方位和锚板的粗糙度无关,但完全光滑条件下破坏面扇圆部分的半径只有完全粗糙条件下的一半;在考虑无重土情况下浅埋条形锚板的抗拔承载力系数随锚板埋深比的增大而增大,破坏面也随埋深比的增加而逐渐扩大。所得上限解与已有文献解答较为吻合,而且求解所得破坏面更为直观,能为工程设计提供参考依据。
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| 关 键 词： | 极限分析 旋转块体集 锚板 抗拔承载力 黏土 |
| 收稿时间： | 2010-07-29 |
Analysis of pull-out capacity of plate anchor using upper bound limit method |
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| YU Sheng-bing,HUANG Mao-song.Analysis of pull-out capacity of plate anchor using upper bound limit method[J].Rock and Soil Mechanics,2010,31(Z2):160-163. |
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| Authors: | YU Sheng-bing HUANG Mao-song |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | Based on the upper bound theorem of limit analysis, admissible velocity field of strip anchor is constructed by using a combination of several rotational block sets. Upper bound solutions of pull-out capacities of deep and shallow strip anchors in undrained clay are analyzed. Pull-out capacity and failure surface characteristics under different embedment inclinations and depths are studied. The results are compared with results of existing methods. It is shown that the bearing capacity of deep strip anchor is independent of the incline angle of anchor embedment and the roughness of anchor surface. The failure surface radius of deep strip anchor under completely smooth condition is half of the radius under completely rough. The failure surface of shallow strip anchor enlarges rapidly with embedment ratio increasing; and the pull-out capacity of shallow strip anchor also increases with the increasing of embedment ratio. Comparison of the upper bound solutions with the existing solutions shows good agreement. Failure surface derived from rotational block set is explicit. It can be a reference for the practical design. |
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| Keywords: | limit analysis rotational block set plate anchor pull-out capacity clay |
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