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Numerical experimental study on optimum design of anchorage system for Xiashu loess slope

下蜀土边坡锚固系统优化设计数值试验研究

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Abstract

In FLAC3D, cable element or modified pile element can be used to build slope anchoring model. However, the difference between the two structural elements and their influence on the calculation results have not been studied in depth. In order to solve this problem, the Xiashu loess slope anchoring models based on cable element and modified pile element were constructed respectively. A variety of anchoring schemes were designed by orthogonal experiment method, and then they were brought into the model for calculation and the calculation results were analyzed by range analysis and variance analysis. The results show that the modified pile element can bear the bending moment and reflect the strain softening property of the grout. From the perspective of slope safety factor, the anchorage length and anchor bolt spacing are the main factors affecting the stability of the slope, and the anchorage angle is the secondary factor. The grout in cable element is assumed to be an elastic-perfectly plastic material, so the safety factor of the slope can be significantly increased by increasing the length of the anchor bolts. This will bring potential risks to the slope treatment project. Therefore, in the calculation of the slope anchoring model, the modified pile element is more suitable for simulating the anchor bolt.

摘要

在FLAC3D中, 可以使用锚杆单元或修改桩单元构建边坡锚固模型. 但有关两种结构单元的区别 及其对计算结果的影响并未得到深入研究. 为了解决这个问题, 基于锚杆单元和修改桩单元的两种下 蜀黄土边坡锚固模型被构建. 通过正交试验法设计了多种锚固方案, 随后带入模型进行计算并对计算 结果进行极差分析和方差分析. 结果显示: 使用修改桩单元构建的锚杆既可以承受弯矩又能反映材料 的应变软化特性, 基于修改桩单元构建的下蜀土边坡锚固模型的计算结果更加贴近工程实际. 从边坡 安全系数角度看锚杆长度和锚杆间距为边坡稳定性影响的主要因素, 锚固角度为次要因素. 根据方差 分析计算的F值可以得出, 由于在锚杆单元中浆体材料被假定为理想弹塑性材料, 在使用该单元构建 的边坡锚固模型中, 只需增大锚杆长度即可显著增大边坡安全系数. 但这会给边坡治理工程带来潜在 风险. 因此在边坡锚固模型计算中修改桩单元更加适合模拟锚杆.

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Authors and Affiliations

  1. School of Earth Science and Engineering, Hohai University, Nanjing, 210098, China

    Wu-chao Wang  (王武超), Shao-rui Sun  (孙少锐) & Ji-hong Wei  (魏继红)

  2. Jiangsu Province Geological Survey Institute, Nanjing, 210018, China

    Yong-xiang Yu  (喻永祥), Wei He  (何伟) & Jing-lei Song  (宋京雷)

Authors
  1. Wu-chao Wang  (王武超)
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  2. Shao-rui Sun  (孙少锐)
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  3. Ji-hong Wei  (魏继红)
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  4. Yong-xiang Yu  (喻永祥)
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  5. Wei He  (何伟)
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  6. Jing-lei Song  (宋京雷)
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Corresponding author

Correspondence to Shao-rui Sun  (孙少锐).

Additional information

Foundation item

Project(41672258) supported by the National Natural Science Foundation of China; Project(2018045) supported by the Science and Technology Project of Jiangsu Provincial Land and Resources, China

Contributors

The overarching research goals were developed by SUN Shao-rui, WANG Wu-chao, and SONG Jing-lei. WANG Wu-chao, YU Yong-xiang and HE Wei provided the pull-out test of fully grouted anchor bolt data, and analyzed the measured data. WANG Wu-chao, and WEI Ji-hong established the models and calculated the parameters. WANG Wuchao, YU Yong-xiang and HE Wei analyzed the calculated results. The initial draft of the manuscript was written by WANG Wu-chao, SUN Shao-rui, and WEI Ji-hong. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

WANG Wu-chao, SUN Shao-rui, WEI Ji-hong, YU Yong-xiang, HE Wei, and SONG Jing-lei declare that they have no conflict of interest.

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Wang, Wc., Sun, Sr., Wei, Jh. et al. Numerical experimental study on optimum design of anchorage system for Xiashu loess slope. J. Cent. South Univ. 28, 2843–2856 (2021). https://doi.org/10.1007/s11771-021-4811-x

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  • DOI: https://doi.org/10.1007/s11771-021-4811-x

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