| 劈裂真空法加固软土地基的效果分析 |
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| 引用本文： | 章定文,韩文君,刘松玉,杜广印.劈裂真空法加固软土地基的效果分析[J].岩土力学,2012,33(5):1467-1472. |
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| 作者姓名： | 章定文 韩文君 刘松玉 杜广印 |
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| 作者单位： | 东南大学 交通学院，南京 210096 |
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| 基金项目： | 国家自然科学基金资助项目(No.50808046,No.51078083);江苏省交通科技项目(No.08Y34) |
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| 摘 要： | 针对常规真空预压法加固软土地基中存在的问题，介绍了最新研制开发的气压劈裂真空预压法及其施工工艺，并通过现场试验段测试结果分析了劈裂真空法加固软土地基的效果。测试结果表明，较常规真空预压法而言，劈裂真空法可以提高真空荷载向深层土体中的传递效率和加速超静孔隙水压力的消散，既可改善深层软土的加固效果又可加速地基固结，缩短工程工期；劈裂真空法加固地基的沉降效率大于常规真空预压法处理地基，沉降易于收敛，有利于工后沉降的控制。通过加固前后孔压静力触探试验测试结果对比和取样室内试验土性参数变化分析，论证了劈裂真空法加固深层软土地基的有效性和优越性。
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| 关 键 词： | 劈裂真空法 软土 现场监测 加固效果 |
| 收稿时间： | 2010-11-04 |
Effect analysis of a soft ground reinforced by a combined vacuum preloading and pneumatic fracturing method |
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| ZHANG Ding-wen
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HAN Wen-jun
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LIU Song-yu
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DU Guang-yin.Effect analysis of a soft ground reinforced by a combined vacuum preloading and pneumatic fracturing method[J].Rock and Soil Mechanics,2012,33(5):1467-1472. |
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| Authors: | ZHANG Ding-wen HAN Wen-jun LIU Song-yu DU Guang-yin |
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| Institution: | School of Transportation, Southeast University, Nanjing, 210096, China |
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| Abstract: | To overcome the problems of traditional vacuum preloading method,vacuum preloading and pneumatic fracturing are combined to reinforce the performance of ground improvement.The mechanism and construction procedures of the combined method are introduced firstly.The reinforcement effect of the combined method is validated through a pilot highway embankment on soft clay in Jiangsu,China.Comparing to the traditional vacuum preloading method,the combined vacuum preloading and pneumatic fracturing method would enhance the transfer efficiency of vacuum into deep soil layers and accelerate the dissipation of excess pore water pressure.Therefore,the strength increase of soft soil layers improved by the combined method is much larger than that of ground reinforced by the traditional vacuum preloading method.The combined method also can reduce the construction period than the traditional vacuum preloading method.The test results of cone penetration tests and engineering properties tests of soft soils also indicate the superior of the combined vacuum preloading and pneumatic fracturing method. |
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| Keywords: | combined vacuum preloading and pneumatic fracturing method soft soil field monitoring reinforcement effect |
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