岩土力学 ›› 2020, Vol. 41 ›› Issue (2): 428-436.doi: 10.16285/j.rsm.2019.0433

• 基础理论与实验研究 • 上一篇    下一篇

高压注浆钢花管微型桩抗滑特性 足尺模型试验研究

陈贺1, 2, 3,张玉芳4,张新民3,魏少伟4   

  1. 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071;2. 中国科学院大学,北京 100049; 3. 云南省交通规划设计研究院有限公司,云南 昆明 650041;4. 中国铁道科学研究院集团有限公司,北京 100081
  • 收稿日期:2019-02-28 修回日期:2019-04-30 出版日期:2020-02-11 发布日期:2020-02-08
  • 作者简介:陈贺,男,1986年生,博士研究生,主要从事岩土工程灾害的监测、防治等方面的咨询和研究工作
  • 基金资助:
    云南省交通运输厅科技项目(No. 云交科教[2017]33);国家重点研发计划(No. 2018YFC1504903);交通部科技示范工程项目(No. 2017-09)。

Full-scale model experiments on anti-sliding characteristics of high-pressure grouting steel-tube micropiles

CHEN He1, 2, 3, ZHANG Yu-fang4, ZHANG Xin-min3, WEI Shao-wei4   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Broadvision Engineering Consultants, Kunming, Yunnan 650041, China; 4. China Academy of Railway Sciences Corporation Limited, Beijing 100081, China
  • Received:2019-02-28 Revised:2019-04-30 Online:2020-02-11 Published:2020-02-08
  • Supported by:
    This work was supported by the Science and Technology Project of Yunnan Province Transportation Department ([2017]33), the National Key R&D Program of China (2018YFC1504903), the Science and Technology Demonstration Project of Ministry of Transport PRC (2017-09).

摘要: 为了探讨高压注浆钢花管微型桩在真实受力状态下的抗滑特性,开展了高压注浆钢花管微型单桩和群桩加固滑坡的足尺模型试验,以及重力注浆微型单桩加固滑坡的对比试验。结果表明:高压注浆能够劈裂桩周土体,在滑动带形成树根状的胶结体,显著地改善滑坡土体的力学性能,增强桩体抵抗变形的能力,减小桩体的弯曲变形,致使滑动带土体抗剪强度增加了152.6%;较重力注浆微型桩,高压注浆钢花管微型单桩、群桩加固滑坡的水平极限荷载分别提高了37.8%、71.2%;极限状态条件下,高压注浆钢花管群桩中后排桩承受的水平推力和弯矩最大,前排桩次之,中间桩最小,从坡体后缘向前缘弯矩最大位置处桩身混凝土由挤压破坏转变为张拉破坏。

关键词: 滑坡加固, 高压注浆钢花管微型桩, 抗滑特性, 足尺模型试验

Abstract: This paper presents an investigation into anti-sliding characteristics of high-pressure grouting steel-tube micropiles under actual stress condition. Full-scale model experiments were performed on landslides reinforced with a single high-pressure grouting steel-tube micropile and a group of micropiles, and with a single gravity grouting micropile as a comparison experiment. The results demonstrate that the root-shaped bonded bodies near sliding zone are formed due to the splitting of soil around the micropile by the high-pressure grouting. High-pressure grouting is able to improve soil mechanical properties significantly in landslides, enhance the resistance deformation capability of the pile bodies, decrease the bending deformation of piles, and leads to an increase of 152.6% for shear strength of the soil in the sliding zone. Comparing with the gravity grouting micropile, the horizontal ultimate loads of the landslides reinforced by a single high-pressure grouting steel-tube micropile and a group of micropiles increase by 37.8% and 71.2%, respectively. In the high-pressure grouting group piles, the horizontal forces and bending moments acting on the backward pile are maximum, followed by the forward pile, while those acting on the middle pile are minimum under the condition of limit state. The failure locations of the piles are characterized by the maximum bending moment. The failure mode of the concrete around the piles transforms from crush failure located at trailing edge to tension failure at leading edge of the landslide.

Key words: landslide reinforcement, high-pressure grouting steel-tube micropile, anti-sliding characteristics, full-scale model experiment

中图分类号: 

  • TU 473
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