| 膨胀土地区边坡拟框锚结构工作特性的现场试验 |
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| 引用本文： | 李雄威,孔令伟,郭爱国.膨胀土地区边坡拟框锚结构工作特性的现场试验[J].岩土力学,2010,31(Z2):125-130. |
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| 作者姓名： | 李雄威 孔令伟 郭爱国 |
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| 作者单位： | 1. 常州工学院 土木建筑工程学院，江苏 常州 213002；2. 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 武汉 430071 |
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| 基金项目： | 国家自然科学基金资助项目（No. 10872210）；交通部西部交通建设科技项目（No. 200631878530）;岩土力学与工程国家重点实验室资助项目（No. SKLZ0803）；常州工学院自然科学研究基金项目（No. YN0911）。 |
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| 摘 要： | 以广西膨胀土为研究对象,考虑气象因素的影响,模拟单锚和框锚结构,进行了现场试验测试。膨胀土与结构物共同作用的结果表明,大气剧烈影响深度范围内土体的胀缩性会对锚杆的工作状态产生较大影响,实际工程中可以考虑对大气剧烈影响深度范围内的锚杆设置自由段。在雨季,框架梁可通过锚杆对梁的约束限制土体膨胀变形,维持土体干密度,进而阻止土体强度的衰减,以达到防止边坡发生浅层破坏的目的。膨胀土吸湿膨胀时,由于框锚结构是半刚性的体系,随着变形协调的过程,框锚结构会释放部分膨胀力,这使梁底土体反力维持在一个定值左右,同时,土体反力呈现中间大两边小的分布形式。现场试验测试结果可对框锚防护系统的设计起到优化的作用。
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| 关 键 词： | 膨胀土 边坡 大气影响 框锚系统 共同作用 |
| 收稿时间： | 2010-07-30 |
Field test on simulating frame anchor system in expansive soil slope |
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| LI Xiong-wei,KONG Ling-wei,GUO Ai-guo.Field test on simulating frame anchor system in expansive soil slope[J].Rock and Soil Mechanics,2010,31(Z2):125-130. |
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| Authors: | LI Xiong-wei KONG Ling-wei GUO Ai-guo |
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| Institution: | 1. School of Civil Engineering & Architecture, Changzhou Institute of Technology, Changzhou, Jiangsu 213002, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | Considering the effect of atmosphere, field test on simulating single anchor and frame anchor is carried out in Guangxi. The test results are as follows. Firstly, the swelling-shrinkage characteristics of expansive soil influences the working state of anchor deeply; so a free part of anchor should be set up in the drastic atmosphere influencing depth. Secondly, in rainy season, the anchoring action to frame beam restricts the swelling deformation and keeps the dry soil density in a certain range, which can prevent the strength weakening tendency of expansive soil and the shallow damage of the slope. Finally, because the frame anchor system is semi-rigid structure, the swelling stress may be released partly with the compatible deformation process when the soil is wetting and swelling, which keeps the soil additional stress under the beam to a constant value and show a distribution form of a big one in the center and a smaller one on each side. The results of field test can optimize the design of frame anchor system. |
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| Keywords: | expansive soil slope atmosphere influence frame archor system interaction |
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