| 土钉与复合土钉支护结构数值模拟对比分析 |
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| 引用本文： | 王媛媛,秦四清.土钉与复合土钉支护结构数值模拟对比分析[J].工程地质学报(英文版),2006,14(2):271-275. |
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| 作者姓名： | 王媛媛 秦四清 |
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| 作者单位： | 中国科学院地质与地球物理研究所,北京100029 |
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| 摘 要： | 近几年来,复合土钉支护结构广泛应用于深基坑支护中。本文对一工程实例用SnEpFem土钉墙有限元数值分析软件,对土钉和预应力锚杆+土钉、微型桩+土钉、微型桩+预应力锚杆+土钉3种复合土钉支护结构的工作机制进行数值模拟,对比分析4种支护结构的坡面水平位移、坡顶沉降和沉降范围、坑底隆起、张拉区和塑性区范围等特点,发现:(1)与单纯土钉支护相比,复合土钉支护可以有效控制边坡变形,缩小边坡张拉区和塑性区范围,对提高边坡的稳定有利。(2)设置微型桩对坡面水平位移的控制比施加预应力的效果更好。(3)设置微型桩可以有效控制坡顶沉降,而施加预应力对坡顶沉降的影响很小。(4)4种支护结构对坑底隆起的影响趋势是一致的,量值变化很小。经过对比分析,在这一工程地质和水文地质条件下,最可靠的复合土钉支护结构是微型桩+预应力锚杆+土钉支护结构,该支护结构的变形、沉降以及张拉区和塑性区范围都是最小的,是最优的设计结构。
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| 关 键 词： | 基坑支护 复合土钉 水平位移 沉降 隆起 |
| 文章编号： | 1004-9665/2006/14（02）-0270-05 |
| 收稿时间： | 2005-06-16 |
| 修稿时间： | 2005-07-14 |
COMPARISON OF SOIL NAIL AND COMPOSITE SOIL NAIL REINFORCEMENT STRUCTURES USING NUMERICAL SIMULATIONS |
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| WANG Yuanyuan,QIN Siqing.COMPARISON OF SOIL NAIL AND COMPOSITE SOIL NAIL REINFORCEMENT STRUCTURES USING NUMERICAL SIMULATIONS[J].Journal of Engineering Geology,2006,14(2):271-275. |
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| Authors: | WANG Yuanyuan QIN Siqing |
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| Institution: | Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029 |
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| Abstract: | Foundation pits.In this paper,the authors use SnEpFem software to evaluate several alternative soil nail reinforcement structures: soil nail along,pre-stressed anchor plus soil nail;miniature pile plus soil nail;and miniature pile,pre-stressed anchor plus soil nail.Comparison of all four alternatives is done for the characteristics of horizontal deflections,ground surface settlements and the range of settlement,pit bottom uplifts and the areas of tension and plastic zones.It was concluded that(1) Compared with simple soil nail reinforcement structure,composite soil nail reinforcement can control slope distortion in effect,and reduce the areas of tension and plastic zones.Consequently,composite soil nail reinforcement structures can improve slope stability.(2) Setting miniature pile controls horizontal deflections better than adding pre-stress.(3) Setting miniature pile can efficiently control ground surface settlements,however,adding pre-stress influences it a little.(4) The effect for pit bottom uplifts is consistent in all the reinforcement structures,and the values vary a bit.By comparison,under this engineering geologic condition, of all the composite soil nail reinforcement structures,the most dependable one is miniature pile pre-stressed anchor soil nail reinforcement structure.Its distortion,settlement and the areas of tension and plastic zones are least in the four structures,and it is the most excellent reinforcement structure. |
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| Keywords: | Pit Reinforcement Composite Soil nail Horizontal deflection Ground surface settlement Tension zone |
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