| 微型桩组合抗滑结构受力机制的现场试验研究 |
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| 引用本文： | 王 洋,冯 君,谢先当,赖 冰,杨 涛.微型桩组合抗滑结构受力机制的现场试验研究[J].岩土力学,2018,39(11):4226-4231. |
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| 作者姓名： | 王 洋 冯 君 谢先当 赖 冰 杨 涛 |
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| 作者单位： | 1. 西南交通大学 土木工程学院，四川 成都 610031；2. 西南交通大学 高速铁路线路工程教育部重点实验室，四川 成都 610031 |
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| 基金项目： | 国家自然科学基金项目（No. 51178402）；高速铁路线路工程教育部重点实验室资助（No. 20141028）。 |
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| 摘 要： | 针对有顶板连接的“八”字形微型桩组合结构，依托广大（广通至大理）线扩能改造工程，现场监测微型桩工作状态下轴力变化，对微型桩组合支护体系应用于分级开挖边坡加固的受力机制进行研究分析。结果表明：在滑坡推力作用下，各排桩桩身轴向力的分布形式不尽相同，沿推力方向依次呈现出反“S”型、“双弓”型和“S”型的分布规律；各排桩峰值轴力均为拉力，比例关系为：靠山侧桩:中间桩:靠路侧桩=2.5:4.1:3.2，其中靠山侧桩最大轴力出现在桩体下部，中间桩出现在中上部，靠路侧桩最大轴力出现在桩体上部；顶部承台对有斜桩的微型桩群的制约协调作用比一般的竖直桩群显著，水平荷载作用下的桩群易发生较大的挠曲变形，在群桩效应、坡体滑裂面等的综合影响下，引发桩体拉-压等受力形式的转变；组合结构的受力机制表现为先承受滑坡主推力的前两排桩受拉，第3排桩底部嵌固段受压，且随着持续推力作用受压区存在向上发展趋势；各单桩桩身轴力以拉力为主，有利于内部钢筋受拉优势的发挥。
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| 关 键 词： | 微型桩组合结构 现场试验 轴力监测 抗滑机制 |
| 收稿时间： | 2017-03-08 |
In-situ experimental study of anti-siding mechanism
of micro-pile combined structure |
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| WANG Yang,FENG Jun,XIE Xian-dang,LAI Bing,YANG Tao.In-situ experimental study of anti-siding mechanism
of micro-pile combined structure[J].Rock and Soil Mechanics,2018,39(11):4226-4231. |
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| Authors: | WANG Yang FENG Jun XIE Xian-dang LAI Bing YANG Tao |
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| Institution: | 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China； 2. Key Laboratory of High-Speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, China |
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| Abstract: | In view of the “eight” shaped micro-pile composite structure with a roof connection, relying on the upgrading project of the Guangtong-Dali railway, in-situ test of micro-pile combined structure to reinforce stage excavation landslide was carried out to study the anti-siding mechanism. The results show that under the action of sliding thrust, the axial force distribution of each row of piles was different, and the distribution law of anti “S”, “double bow” and “S” was successively presented along the thrust direction. The peak axial force of each row of piles was tension, and the proportion of the side piles of the mountain: the middle piles: the roadside piles was 2.5:4.1:3.2. The maximum axial force of the side piles of the mountain was at the lower part of the piles, the middle piles appeared at the middle and upper part, and the roadside piles appeared at the upper part of the pile body. The coordination effect of the top cap on the inclined pile group was more significant than that of the general vertical pile group. The pile group under horizontal load was prone to large flexure deformation. Under the combined influence of pile group effect and slip surface, the transfer of tension and pressure forms of pile body were generated. The force mechanism of the composite structure is that: the first two rows of piles are subjected to tension, the bottom embedded section of the third row piles is compressed, and the compression zone demonstrates upward trend with the continuous load. Our results also show that the axial force of the single pile is dominated by the tension force, which is beneficial to the exertion of the internal steel in tension. |
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| Keywords: | micro-pile combined structure in-situ experiment axial force monitoring anti-siding mechanism |
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