| 非均质地基浅埋水平条形锚板承载力上限分析 |
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| 引用本文： | 黄明华,胡倩,黄炎杰,赵明华.非均质地基浅埋水平条形锚板承载力上限分析[J].水文地质工程地质,2017,0(6):37-37. |
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| 作者姓名： | 黄明华 胡倩 黄炎杰 赵明华 |
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| 作者单位： | 湖南大学岩土工程研究所，湖南 长沙410082 |
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| 基金项目： | 国家自然科学基金项目资助（51508180）；中国博士后科学基金项目资助（2015M570678）；中央高校基本科研业务费项目资助 |
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| 摘 要： | 考虑地基土体的非均质特性，采用非线性Mohr-Coulomb强度准则及其关联流动法则构造了浅埋水平条形锚板的曲线型破裂机制与机动许可速度场，根据极限分析上限定理推导了条形锚板抗拔承载力的表达式。利用变分极值原理求得了锚板抗拔承载力及其上方土体破裂面的上限解，分析了锚板埋深、土体非均质和非线性强度特性对锚板抗拔承载特性的影响，并将该上限解与已有计算方法进行了对比。结果表明:锚板埋深、土体非均质和非线性强度特性对其抗拔承载力与破裂面特征具有明显的影响。锚板埋深和土体非均质系数越大以及土体非线性强度系数越小，锚板抗拔承载力和土体破裂面深度、宽度均是越大。该上限解与极限平衡和极限分析有限元方法的计算结果基本一致，验证了所采用的曲线型破裂机制和地基非均质变化规律有效性，为条形锚板设计提供了一定的参考。
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| 关 键 词： | 条形锚板 非均质地基 上限分析 抗拔承载特性 非线性强度准则 |
| 收稿时间： | 2017-04-22 |
| 修稿时间： | 2017-05-26 |
Upper bound analysis of the pullout capacity of shallow horizontal strip anchor plate embedded in heterogeneous soils |
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| HUANG Minghua,HU Qian,HUANG Yanjie,ZHAO Minghua.Upper bound analysis of the pullout capacity of shallow horizontal strip anchor plate embedded in heterogeneous soils[J].Hydrogeology and Engineering Geology,2017,0(6):37-37. |
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| Authors: | HUANG Minghua HU Qian HUANG Yanjie ZHAO Minghua |
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| Affiliation: | Institute of Geotechnical Engineering, Hunan University, Changsha, Hunan410082, China |
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| Abstract: | Considering the heterogeneity of soils, a kinematic admissible velocity field was constructed to characterize a proposed curve failure mechanism of soils above the shallow strip anchor plate on the basis of the nonlinear Mohr-Coulomb criterion and the associated flow rule. The ultimate pullout force and failure mechanism of the shallow strip anchor plate were derived using the upper bound analysis method and the variation minimum principle. The influences of the embedded depth, heterogeneity and nonlinear strength features on its ultimate pullout force and failure mechanism were discussed, and comparisons between this upper bound solution and the existing solutions were also conducted. The results show that the embedded depth, heterogeneity and nonlinear strength features have obvious effects on the ultimate pullout force and failure mechanism of the shallow strip anchor plate. With the increases in the embedded depth and heterogeneity coefficient as well as the decrease in the nonlinear strength coefficient, the ultimate pullout force of the shallow strip anchor plate increases together with the failure zone (depth and width) of soils. The calculation results of this upper bound solution show good agreements with those of the limit equilibrium method and limit analysis by the finite element method, which shows the effectiveness of this proposed curve failure mechanism and heterogeneity law of soils, and provides some references for the design of shallow strip anchor plates. |
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