| 袋装砂井爆夯处理软土地基的数值模拟方法及现场试验验证 |
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| 引用本文： | 邓志勇,张翠兵,张志毅.袋装砂井爆夯处理软土地基的数值模拟方法及现场试验验证[J].岩土力学,2008,29(7):1931-1937. |
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| 作者姓名： | 邓志勇 张翠兵 张志毅 |
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| 作者单位： | 1. 铁道科学研究院铁道建筑研究所,北京,100081
2. 铁道部运输局,北京,100844 |
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| 摘 要： | 袋装砂井爆夯法处理软土地基是利用炸药在设置有排水通道的软土中爆炸产生冲击和振动而使土体加固的方法.针对该法进行理论研究,提出了一种将袋装砂井爆夯处理软土地基的三维问题转化为二维平面应变问题的数值模拟方法:袋装砂井转化为等价砂墙;利用等效冲量原理,炮孔爆炸压力则转化为等效压力墙.数值模拟中考虑了土体骨架变形与孔隙水非达西渗流的耦合.对数值模拟的现场试验验证分析表明,沉降数值分析的结果与铁路宁启线软基处理现场测试结果具有很好的可比性.所提出的数值分析方法可模拟袋装砂井爆夯处理软土地基的超静孔隙水压产生和消散以及土体沉降变形的动态过程.
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| 关 键 词： | 爆夯 袋装砂井 软土 地基处理 数值模拟 袋装砂井 处理软土地基 数值分析 模拟方法 试验验证 experiments verification vibration explosive sand consolidation drainage treatment soft clay modelling 动态过程 沉降变形 超静孔隙水压 可比 测试结果 |
| 收稿时间： | 2006-11-15 |
Numerical modelling of soft clay treatment by drainage consolidation with sand wick explosive vibration and its verification with in-situ experiments |
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| DENG Zhi-Yong,ZHANG Cui-Bing,ZHANG Zhi-Yi.Numerical modelling of soft clay treatment by drainage consolidation with sand wick explosive vibration and its verification with in-situ experiments[J].Rock and Soil Mechanics,2008,29(7):1931-1937. |
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| Authors: | DENG Zhi-Yong ZHANG Cui-Bing ZHANG Zhi-Yi |
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| Institution: | 1. Institute of Railway Construction, China Academy of Railway Sciences, Beijing 100081, China; 2. Train Operation Bureu, Ministry of Railway, Beijing 100844, China |
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| Abstract: | A method for treating soft clay by sand wick and explosive vibration is introduced. And a numerical modelling method is proposed for transforming the three-dimensional soft clay treatment by drainage consolidation with explosive vibrations into a two-dimensional plane strain problems. In this method, the sand drains is transformed into equivalent sand walls; and the explosive pressure on porthole is transformed into equivalent pressure walls, which is based on the mechanism of equivalent impulse. The deformation of soil skeleton and the non-Darcy seepage of pore water is coupled in the numerical modelling. A comparison between numerical results and in-situ experimental results shows that both results are comparable. The numerical method is capable of modelling the dynamic process of the occurrence and dissipation of excess pore pressure and the soil settelment in the course of dynamic consolidation. |
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| Keywords: | drainage consolidation with explosive vibration sand wick soft clay soil treatment numerical modelling |
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