岩土力学 ›› 2023, Vol. 44 ›› Issue (6): 1695-1707.doi: 10.16285/j.rsm.2022.1130

• 基础理论与实验研究 • 上一篇    下一篇

微型桩加固长大缓倾裂隙土边坡模型试验

马鹏杰1，芮瑞2, 3，曹先振1，夏荣基2，王曦1，丁锐恒2，孙天健2   

  1. 1. 中国南水北调集团中线有限公司渠首分公司，河南 南阳 474599；2. 武汉理工大学 土木工程与建筑学院，湖北 武汉 430070； 3. 武汉理工大学 三亚科教创新园，海南 三亚 572025
  • 收稿日期:2022-07-19 接受日期:2022-10-26 出版日期:2023-06-14 发布日期:2023-06-14
  • 通讯作者: 芮瑞，男，1981年生，博士，教授，主要从事岩土工程加固与地基处理技术的研究与教学工作。E-mail: r.rui@whut.edu.cn E-mail:70023524@qq.com
  • 作者简介:马鹏杰，男，1983年生，学士，工程师，主要从事水利工程运行、施工技术方面的工作。
  • 基金资助:
    国家自然科学基金（No.42272315）；国家级大学生创新训练项目（No.202210497387）。

Model tests of micropile-reinforced soil slope with long and gently inclined fissures

MA Peng-jie1, RUI Rui2, 3, CAO Xian-zhen1, XIA Rong-ji2, WANG Xi1, DING Rui-heng2, SUN Tian-jian2   

  1. 1. Head Section, Middle Branch of China South-to-North Water Diversion Co., Ltd., Nanyang, Henan 474599, China; 2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, Hubei 430070, China; 3. Science Education Innovation Park, Wuhan University of Technology, Sanya, Hainan 572025, China
  • Received:2022-07-19 Accepted:2022-10-26 Online:2023-06-14 Published:2023-06-14
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (42272315) and the National Innovation Training Program for College Students (202210497387).

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摘要： 南水北调工程中大量膨胀土边坡因其内部的长大缓倾裂隙而发生滑动，其抢险与加固工程中微型桩取得了较好的应用效果。研究微型桩加固长大缓倾裂隙土边坡的加固机制及其参数影响，对此类工程的微型桩加固设计具有重要意义。以微型桩加固膨胀土边坡的实际工程为背景，采取对边坡滑体沿裂隙面平行方向施加推力的方式，开展了不同缓倾裂隙面角度的未加桩边坡推移破坏试验，并以桩长、排间距和桩位为影响参数，进行了微型桩加固长大缓倾裂隙土边坡的参数影响模型试验，对边坡的位移特征以及微型桩的受力特性与加固效应进行了分析。结果表明：微型桩对于缓倾裂隙边坡具有较好的抗滑加固效果，能够将抗滑阻力维持在较高的水平。微型桩能提供的抗滑阻力随桩长（锚固比）增加而增加，但提升效率随桩长增加而减小。建议布置在边坡上1/3处的微型桩锚固比取值为0.5，布置在边坡下1/3处的微型桩锚固比取值不小于0.65。桩身弯矩与剪力均呈反S形分布，最大值均位于裂隙面附近。双排桩使得边坡抵抗破坏的韧性增强，当排距为200 mm（10倍桩径）时，前后排桩协调较好，均能较为充分地发挥抗滑作用，对边坡抗滑推力提升较大。

关键词: 微型桩, 缓倾裂隙, 土质边坡, 相似模型试验, 受力特性

Abstract: In the South-to-North Water Diversion Project, a large number of expansive soil slopes slid due to the long and gently inclined fissures. The micropiles had achieved good application in the rescue and reinforcement project of the expansive soil slopes. The study on the reinforcement mechanism and the influence of parameters of micropiles in reinforcing the soil slope with long and gently inclined fissures is of great significance for the design of such projects. Based on the actual project of reinforcing expansive soil slope with micropiles, the thrust was applied on the sliding body along the direction of the fissure surface, and the failure tests of the non-piled slope with different angles of the gently inclined fissure were carried out. After taking the pile length, row spacing and pile position as influence parameters, the model tests of micropile-reinforced soil slope with long and gently inclined fissures were carried out, the displacement characteristics of the slope and the stress characteristics and the reinforcement effect of the micropile were analyzed. The test results showed that the micropile had a good anti-slide reinforcement effect for the slope with gently inclined fissures, and could maintain the anti-slide resistance at a high level. The anti-slide resistance provided by micropiles increased with the increase of pile length (anchorage ratio), while the increase efficiency decreased with the increase of pile length. It was suggested that the anchorage ratio of micropiles should be 0.5 when the pile is arranged at upper 1/3 position of the slope, and less than 0.65 when it is arranged at lower 1/3 position of the slope. The distribution of bending moment and shear force of the piles was reversed S-shape, and the maximum values were located near the fissure surface. The double-row piles can enhance the toughness of the slope to resist damage. When the row spacing was 200 mm (10 times the pile diameter), the front and rear rows of piles can well coordinate, which could give full play to the anti-slide effect and greatly increased the anti-slide thrust of the slope.

Key words: micropile, gently inclined fissure, soil slope, similarity model test, mechanical behaviors

中图分类号: 

  • TU473.1
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