| 红砂岩路基强夯处理大变形数值模拟方法与效果分析 |
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| 引用本文： | 王桂尧,胡振南,匡希龙.红砂岩路基强夯处理大变形数值模拟方法与效果分析[J].岩土力学,2008,29(9):2451-2456. |
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| 作者姓名： | 王桂尧 胡振南 匡希龙 |
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| 作者单位： | 1. 长沙理工大学 土木与建筑学院，长沙 410076；2. 湖南省高速公路管理局，长沙 410001；3. 湖南交通职业技术学院 路桥系，长沙 410004 |
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| 摘 要： | 针对红砂岩路基难以压实的特性，采用强夯方法，提高红砂岩路基压实度。基于强夯处理红砂岩路基的现场试验，采用显示动力有限元程序LS-DYNA建立强夯三维模型，对强夯的动力响应进行了数值模拟，研究了强夯作用下红砂岩碎石土路堤的应力-应变变化规律，得到了强夯后土体的应力场、位移场，并与现场试验结果进行了对比，分析了强夯加固红砂岩路基的作用机制及有关夯击参数的取值方法，认为直径为2 m的夯锤在1 200 kN?m夯击能作用下的有效影响深度为4～6 m，锤间距（中心距）不宜大于3.5 m。
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| 关 键 词： | 强夯 红砂岩路基 数值模拟 现场试验 效果分析。 |
| 收稿时间： | 2006-12-19 |
Large-strain numerical simulation and experimental result reseach about improving red-sandstone embankment by dynamic compaction |
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| WANG Gui-yao,HU Zhen-nan,KUANG Xi-long.Large-strain numerical simulation and experimental result reseach about improving red-sandstone embankment by dynamic compaction[J].Rock and Soil Mechanics,2008,29(9):2451-2456. |
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| Authors: | WANG Gui-yao HU Zhen-nan KUANG Xi-long |
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| Institution: | 1. School of Civil Engineering and Architecture,Changsha University of Science &Technology, Changsha 410076, China; 2. Administration Bureau of Hunan Expressway, Changsha 410001, China; 3. Highway and Bridge Department,Hunan Vocational Polytechnic College of Communications, Changsha 410004, China |
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| Abstract: | Since the uncompressible for red-sandstone embankment, the dynamiic compaction method is used and the 3D FEM model about improving red-sandstone embankment by dynamic compaction is established. The numerical simulation of whole dynamic compaction process is carried out; and the coutours of displacement & stress are obtained with explicit dynamic finite element program ANSYS/LS-DYDA. The results show that the orderliness of stress & strain is quite consistant with the experimental results. The mechanism of improving red-sandstone embankment via dynamic compaction as well as how to determine compaction parameters is also analyzed.Meanwhile,the results show that the effective influence depth is about 4~6 m, and the hammer’s contact distance is about 3.5 m, for hammers with tamping-energy is 1 200 kN?m and diameter is 2 m. |
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| Keywords: | dynamic compaction red-sandstone embankment numerical simulation In-situ experiment effect analysis |
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