砂土中倾斜条形锚板法向拉拔承载特性研究

胡伟; 张翰林; 孟建伟; 刘顺凯; 聂志红

doi:10.11779/CJGE20220474

砂土中倾斜条形锚板法向拉拔承载特性研究 English Version

胡伟^{1, 2,},
张翰林^{1, 2},
孟建伟^{1, 2},
刘顺凯^{2, 3},
聂志红³

1.
湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室, 湖南湘潭 411201
2.
湖南科技大学土木工程学院, 湖南湘潭 411201
3.
中南大学土木工程学院, 湖南长沙 410083

基金项目:

国家自然科学基金项目 52178332

详细信息

作者简介:
胡伟(1982—)，男，博士，教授，博士生导师，主要从事地基与基础工程方面的研究工作。E-mail: yilukuangben1982@163.com

中图分类号: TU43
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出版历程
- 收稿日期: 2022-04-19
- 网络出版日期: 2023-02-20
- 刊出日期: 2023-06-30

Normal pullout bearing characteristics of inclined strip anchor plate in sand

HU Wei^{1, 2,},
ZHANG Hanlin^{1, 2},
MENG Jianwei^{1, 2},
LIU Shunkai^{2, 3},
NIE Zhihong³

1.
Hunan Province Key Laboratory of Geotechnical Engineering Stability Control and Health Monitoring, Hunan University of Science and Technology, Xiangtan 411201, China
2.
School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
3.
School of Civil Engineering, Central South University, Changsha 410083, China

摘要

摘要: 锚板倾斜埋设时，倾角对承载特性的影响研究尚不充分，倾角与埋深耦合控制锚板承载机制的规律还不明确。基于模型试验和数字照相测量技术开展了砂土中倾斜条形锚板的承载特性研究，得到了以下4点认识：①锚板上拔承载因子N_γ随埋深比增加呈先快后缓的增大趋势，直至趋于一渐近值，倾角越大，上拔承载因子增速越快。②承载力增长系数K_i随埋设倾角增加表现为非线性增大，而随埋深比的增大则呈整体下降趋势，速率先快后慢，且埋深比越大，埋设倾角对拉拔承载力的影响越小。③锚周土体滑动面随埋深比和埋设倾角的演化可用椭圆来刻画，该椭圆的长短轴比随埋深比的增大而减小，两者之间可用幂函数来表征；埋设倾角对椭圆大小没有影响，将同埋深比水平锚板滑动面椭圆转动一定角度可得到倾斜锚板滑动面椭圆，该角度可表达为埋设倾角的二次函数。④采用等效路径法可将浅埋水平锚板拉拔力学模型推演至深埋倾斜锚板拉拔力学模型，使得在埋深和倾角全域内构建锚板拉拔力学分析模型成为可能。
- 条形锚板 /
- 上拔承载因子 /
- 承载力增长系数 /
- 滑动面 /
- 埋深比 /
- 倾角 /
- 椭圆
Abstract: For the inclined burial anchor plate, the researches on the influences of inclination angle on the bearing characteristics are insufficient, and the coupling effects of inclination angle and burial depth controlling the bearing mechanism are also not clear. Based on the model tests and the digital photographic measurement technology, the bearing characteristics of the inclined strip anchor plate in sand are studied, and the following conclusions are drawn: (1) The uplift bearing factor Nγ of the anchor plate increases rapidly at first and then slowly with the increase of the burial depth ratio, until it approaches an asymptotic value. The larger the inclination angle, the faster the growth rate of uplift bearing factor. (2) The growth factor of bearing capacity K_i increases nonlinearly with the increase of the burial angle, but decreases as a whole with the increase of the burial depth ratio, and the growth rate is faster at first and then slower. The larger the burial depth ratio is, the smaller the influence of inclination angle on the uplift bearing capacity. (3) The evolution of sliding surface of soil around the anchor with the burial depth ratio and the inclination angle can be described by an ellipse. The ratio of the major to minor axes of the ellipse decreases with the increase of the burial depth ratio, which can be described by the power function. With the same burial depth ratio, the size of the ellipse is not affected by the inclination angle, but has to rotate the ellipse of the horizontal anchor plate by a certain angle to obtain the ellipse of the inclined anchor plate, and this rotation angle can be expressed by the quadratic function of the inclination angle. (4) The equivalent path method can be used to deduce the mechanical models from the shallow-burial horizontal anchor plate to the deep-burial inclined one, which makes it possible to establish the pullout mechanics analysis model for the anchor plate in the whole domain of burial depth and inclination angle.
- strip anchor plate /
- uplift bearing factor /
- growth factor of bearing capacity /
- sliding surface /
- burial depth ratio /
- inclination angle /
- ellipse

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图 1 不同锚板埋设倾角

Figure 1. Different burial angles of anchor plate

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图 2 模型试验装置

Figure 2. Apparatus for model tests

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图 3 代表性荷载-位移曲线

Figure 3. Typical load-displacement curves

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图 4 上拔承载因子随埋设倾角变化规律

Figure 4. Variation of uplift bearing factor with burial angle

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图 5 上拔承载因子随埋深比变化规律

Figure 5. Variation of uplift bearing factor with burial depth ratio

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图 6 增长系数K_i随埋设倾角变化规律

Figure 6. Variation of K_i with burial angle

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图 7 增长系数K_i随埋深比变化规律

Figure 7. Variation of K_i with burial depth ratio

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图 8 锚周土体最大剪应变场

Figure 8. Maximum shear strain fields of soil around anchor plate

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图 9 锚周土体位移场(H/B=4)

Figure 9. Displacement fields of soil around anchor plate (H/B=4)

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图 10 a/b随埋深比变化规律

Figure 10. Variation of a/b with burial depth ratio

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图 11 a/b随埋设倾角变化规律

Figure 11. Variation of a/b with burial angle

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图 12 锚周土体最大剪应变场

Figure 12. Maximum shear strain fields of soil around anchor plate

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图 13 β/α随埋设倾角变化规律

Figure 13. Variation of β/α with burial angle

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图 14 β/α随埋深比变化规律

Figure 14. Variation of β/α with burial depth ratio

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图 15 全域范围内构建力学模型路径

Figure 15. Model paths in whole domain

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