[1]程远,刘松玉,蔡国军,等.基于CPTU测试的共振密实法加固可液化地基效果评价[J].东南大学学报(自然科学版),2011,41(5):1075-1080.[doi:10.3969/j.issn.1001-0505.2011.05.034]
 Cheng Yuan,Liu Songyu,Cai Guojun,et al.Assessment of resonance compaction method on soil liquefaction treatment through CPTU test[J].Journal of Southeast University (Natural Science Edition),2011,41(5):1075-1080.[doi:10.3969/j.issn.1001-0505.2011.05.034]
点击复制

基于CPTU测试的共振密实法加固可液化地基效果评价()
分享到:

《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
41
期数:
2011年第5期
页码:
1075-1080
栏目:
土木工程
出版日期:
2011-09-20

文章信息/Info

Title:
Assessment of resonance compaction method on soil liquefaction treatment through CPTU test
作者:
程远刘松玉蔡国军刘志彬杜广印
(东南大学岩土工程研究所, 南京 210096)
Author(s):
Cheng YuanLiu SongyuCai GuojunLiu ZhibinDu Guangyin
(Institute of Geotechnical Engineering,Southeast University,Nanjing 210096,China)
关键词:
共振密实孔压静力触探液化十字形振动杆
Keywords:
resonance compaction piezocone penetration test(CPTU) liquefaction crisscross section vibratory probe
分类号:
TU413
DOI:
10.3969/j.issn.1001-0505.2011.05.034
摘要:
为了评价共振密实法加固可液化地基的效果,对宿(迁)新(沂)高速公路某15 m厚粉土地基场地采用可变频振动桩锤和自行研制的十字形振动杆进行处理,并进行孔压静力触探(CPTU)测试.在应用CPTU测试进行液化判别的基础上,利用分析得到的相对密实度、有效内摩擦角和压缩模量等场地土性参数和抗液化性能变化对处理效果进行定量评价,并与标准贯入试验结果进行了对比.试验结果表明,密实处理后场地土性参数平均提高1倍以上,在设计7.5级地震作用下,场地达到抵抗潜在液化的水平.共振密实法可以有效加固液化土地基,CPTU测试技术是评价其加固效果的有效方法.
Abstract:
In order to investigate the densification effects of resonance compaction on liquefiable sites, deep vibratory compaction equipment with frequency-variable piling vibrator was adopted to insert a self-developed probe of crisscross section into the 15 m thick silt deposit at Suqian-Xinyi Expressway to treat liquefiable site and in situ piezocone penetration tests (CPTU) were performed before and after soil densification. The research results of liquefaction analysis based on CPTU were reviewed, and soil parameters such as relative density, effective internal friction angle and compression modulus evaluated from the CPTU data before and after densification were compared in order to assess the effect of ground improvement. In addition, the liquefaction potential was also estimated. Standard penetration tests were performed to verify CPTU results. It is shown that the soil parameters based on CPTU increase by a factor of 2 on an average after the compaction. In addition, under the magnitude 7. 5 design earthquake excitation, the silts treated by vibratory compaction is identified to the level of resisting potential liquefaction. It is concluded that the resonance compaction method is particularly suitable for liquefiable foundation improvement and CPTU is a effective way of evaluating the effect of ground improvement.

参考文献/References:

[1] Indraratna B,Chu J.Ground improvement-case histories[M].London:Elsevier,2005.
[2] 刘松玉,杜广印,苗永红.十字形振动翼:中国,2007 10020591.9 [P].2007-08-29.
[3] 刘松玉,杜广印,邵俐,等.共振法加固液化地基的操作方法:中国,201010119970.5[P].2010-07-28.
[4] 张继红,顾国荣.双桥静力触探法判别上海薄夹层黏土地基液化研究[J].岩土力学,2005,26(10):1652-1656.
  Zhang Jihong,Gu Guorong.Study on CPT for liquefaction estimation of sands with thin clay interlayer in Shanghai area [J].Rock and Soil Mechanics,2005,26(10):1652-1656.(in Chinese)
[5] 刘松玉,吴燕开.论我国静力触探技术(CPT) 现状与发展[J].岩土工程学报,2004,26(4):553-556.
  Liu Songyu,Wu Yankai.On the state-of-art and development of CPT in China[J].Chinese Journal of Geotechnical Engineering,2004,26(4):553-556.(in Chinese)
[6] Lunne T,Robertson P K,Powell J J M.Cone penetration testing in geotechnical practice[M].New York:Blackie Academic/Routledge Publishing,1997.
[7] Jamiolkowski M,Lo Presti D C F,Manassero M.Evaluation of relative density and shear strength of sands from CPT and DMT [C]//Soil Behavior and Soft Ground Construction.Cambridge,USA,2003:201-238.
[8] Kulhawy F H,Mayne P W.Manual on estimating soil properties for foundation design[R].Palo Alto,CA,USA:Electric Power Research Institute,1990.
[9] Lunne T.In-situ testing in offshore geotechnical investigations[C]//International Conference on In-Situ Measurement of Soil Properties and Case Histories.Bali,Indonesia,2001:61-81.
[10] 蔡国军,刘松玉,童立元,等.基于CPT测试的国内外砂土液化判别方法研究[J].岩石力学与工程学报,2008,27(5):1019-1027.
  Cai Guojun,Liu Songyu,Tong Liyuan,et al.Evaluation of liquefaction of sandy soils based on cone penetration test [J].Chinese Journal of Rock Mechanics and Engineering,2008,27(5):1019-1027.(in Chinese)
[11] Robertson P K,Wride C E.Evaluating cyclic liquefaction potential using cone penetration test[J].Canadian Geotechnical Journal, 1998,35(3):442-459.
[12] 符圣聪,江静贝.基于静力触探的液化势概率估计和判别标准 [J].工程抗震与加固改造,2005,27(1):70-74.
  Fu Shengcong,Jiang Jingbei.Probabilistic evaluation and criterion of liquefaction potential by CPT [J].Earthquake Resistant Engineering and Retrofitting,2005,27(1):70-74.(in Chinese)
[13] Juang C H,Jiang T.Assessing probabilistic methods for liquefaction potential evaluation[C]//Soil Dynamics and Liquefaction.Denver,USA,2000:148-162.
[14] Chen C J,Juang C H.Calibration of SPT-and CPT-based liquefaction evaluation methods[C]//Innovations and Applications in Geotechnical Site Characterization.Denver,USA,2000:49-64.

相似文献/References:

[1]居俊,刘松玉,刘志彬,等.基于CPTU孔压消散试验的欠固结土OCR计算方法[J].东南大学学报(自然科学版),2011,41(3):642.[doi:10.3969/j.issn.1001-0505.2011.03.040]
 Ju Jun,Liu Songyu,Liu Zhibin,et al.OCR evaluation method of underconsolidated soil through CPTU pore pressure dissipation test[J].Journal of Southeast University (Natural Science Edition),2011,41(5):642.[doi:10.3969/j.issn.1001-0505.2011.03.040]

备注/Memo

备注/Memo:
作者简介:程远(1985—),男,博士生;刘松玉(联系人),男,博士,教授,博士生导师,liusy@seu.edu.cn.
基金项目:国家自然科学基金资助项目(40702047)、江苏省交通厅资助项目(2010Y28)、江苏省优势学科资助项目(1121007001).
引文格式: 程远,刘松玉,蔡国军,等.基于CPTU测试的共振密实法加固可液化地基效果评价[J].东南大学学报:自然科学版,2011,41(5):1075-1080.[doi:10.3969/j.issn.1001-0505.2011.05.034]
更新日期/Last Update: 2011-09-20