深厚回填土地基高能级强夯有效加固深度计算方法及影响因素研究
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摘要
采用高能级强夯处理深厚回填土地基时,可提高地基土的强度和均匀性,降低压缩性,减小沉降量,消除液化和湿陷性等。目前对高能级强夯有效加固深度的研究尚未成熟,规范给出的经验公式又不适用,因此进行高能级强夯有效加固深度计算方法和影响因素研究非常必要。本文针对在碎石土、湿陷性黄土、砂土三种回填土地基上进行的高能级强夯试验,采用平板载荷试验、动力触探试验、瑞利波测试方法研究强夯前、强夯后浅层地基承载力和深层密实度的变化,提出考虑土类别的高能级强夯有效加固深度计算公式,并得到了修正系数取值表。通过分析夯点间距、锤底面积对不同回填土地基有效加固深度的变化规律,得到高能级强夯优化设计参数,可为工程实践提供参考。
The high energy dynamic compaction method is economical and high efficiency when it is used to treat the backfilled soil foundation. It can improve the strength of backfilled soil, decrease compressibility,eliminate collapsibility and liquefaction,etc. At present,the study on the effective depth of improvement for high energy dynamic compaction is not perfect,and the empirical formulas from the relevant codes aren 't suitable. The corrected coefficients are lacked for the high energy dynamic compaction. Therefore,it is necessary to study the method to calculate the effective improvement depth and the influential factors. Through the high energy dynamic compaction tests on the detritus,collapsible loess and sand foundation by using the plate loading tests,dynamic penetration tests and laboratory soil tests,the change regulations of bearing capacity,compression moduls and the effective improvement depth under the different energy levels,the spaces of tamping spots,the diameters of hammers are studied.According to the data,the corrected formula for the effective depth of improvement under different backfilled soils,energy levels is presented,which could provide the guidance for using high energy dynamic compaction method.
The high energy dynamic compaction method is economical and high efficiency when it is used to treat the backfilled soil foundation. It can improve the strength of backfilled soil, decrease compressibility,eliminate collapsibility and liquefaction,etc. At present,the study on the effective depth of improvement for high energy dynamic compaction is not perfect,and the empirical formulas from the relevant codes aren 't suitable. The corrected coefficients are lacked for the high energy dynamic compaction. Therefore,it is necessary to study the method to calculate the effective improvement depth and the influential factors. Through the high energy dynamic compaction tests on the detritus,collapsible loess and sand foundation by using the plate loading tests,dynamic penetration tests and laboratory soil tests,the change regulations of bearing capacity,compression moduls and the effective improvement depth under the different energy levels,the spaces of tamping spots,the diameters of hammers are studied.According to the data,the corrected formula for the effective depth of improvement under different backfilled soils,energy levels is presented,which could provide the guidance for using high energy dynamic compaction method.
引文
[1]水伟厚,董炳寅,梁富华.湿陷性黄土地区高填方压实场地20000k N·m超高能级强夯处理试验研究[A].第十四届全国地基处理学术会议论文集[C].江西:江西科学技术出版社,2016,247~253.Shui Weihou,Dong Bingyin,Liang Fuhua.Experiment research of 20000k N·m ultra-high dynamic compaction about the collapsible loess area high fill foundation after compaction[A].The paper collection of fourteenth national conference on foundation treatment[C].Jiangxi:Jiangxi Science and Technology Press,2016,247~253.(in Chinese)
[2]任新红.绵阳机场强夯影响深度及有效加固深度研究[J].路基工程,2008,(5):50~51.Ren Xinhong.Study on influence depth and effective depth of improvement under dynamic compaction in Mianyang airport[J].Subgrade Engineering,2008,(5):50~51.(in Chinese)
[3]王铁宏,水伟厚,王亚凌等.强夯法有效加固深度的确定方法与判定标准[J].工程建设标准化,2005,(3):27~38.Wang Tiehong,Shui Weihou,Wang Yaling et al.Determination method and criterion of effective depth of improvement under dynamic consolidation[J].Standardization of Engineering Construction,2005,(3):27~38.(in Chinese)
[4]邵忠心,刘献刚,乐平.强夯地基处理有效加固深度的界定与作用[J].建筑施工,2008,130(11):952~956.Shao Zhongxin,Liu Xiangang,Le Ping.Definition and action of effective consolidation depth of dynamic compaction method for foundation treatment[J].Building Construction,2008,130(11):952~956.(in Chinese)
[5]王铁宏,水伟厚,王亚凌.对高能级强夯技术发展的全面与辩证思考[J].建筑结构,2009,(11):86~89.Wang Tiehong,Shui Weihou,Wang Yaling.Thinking of high energy level dynamic compaction application and development[J].Building Structures,2009,(11):86~89.(in Chinese)
[6]Lukas,Robert G.Densification of loose deposits by pounding[J].ASCE J Geotech Eng Div,1980,106(4):435~446.
[7]李朝晖,郑明军,王涛.某罐区高能级强夯试夯检测与分析[J].工程勘察,2010,(S1):880~886.Li Zhaohui,Zheng Mingjun,Wang Tao.The detection and analysis of high energy level dynamic compaction tests in some petroleum storage tank area[J].Geotechnical Investigation&Surveying,2010,(S1):880~886.(in Chinese)
[8]Chaim J.Poran,Jorge A.Rodriguez.Design of dynamic compaction[J].Can.Geotech,1992,29(5):796~802.
[9]杨海巍,刘珍岩,王志平等.某场地湿陷性黄土地基试夯分析[J].工程勘察,2010,(S1):400~406.Yang Haiwei,Liu Zhenyan,Wang Zhiping et al.Analysis of collapsible loess dynamic compaction test on a certain site[J].Geotechnical Investigation&Surveying,2010,(S1):400~406.(in Chinese)
[10]栾帅,王凤来,水伟厚.残积土回填地基高能级强夯有效加固深度试验研究[J].建筑结构学报,2014,35(10):151~158.Luan Shuai,Wang Fenglai,Shui Weihou.Study of effective depth of high energy level dynamic compaction on backfilled residual soil[J].Journal of Building Structures,2014,35(10):151~158.(in Chinese)
[11]荣韶婧,韩云山,段伟等.强夯法同能级轻锤高落与重锤低落的效果对比[J].施工技术,2014,(S2):110~112.Rong Shaojing,Han Yunshan,Duan Wei et al.Comparative study on light hammer with high drop distance and heavy hammer with low drop distance under the same energy level in dynamic consolidation[J].Construction Technology,2014,(S2):110~112.(in Chinese)
[12]冯世进,胡斌,张旭等.强夯参数对夯击效果影响的室内模型试验[J].同济大学学报,2012,40(8):1147~1153.Feng Shijin,Hu Bin,Zhang Xu et al.Model test study on impact parameters influence on tamping effect[J].Journal of Tongji University,2012,40(8):1147~1153.(in Chinese)
[13]中华人民共和国行业标准.建筑地基处理技术规范(JGJ79-2012)[S].北京:中国建筑工业出版社,2012.The Professional Standards of the Peolpe's Repbulic of China.Technical code for ground treatment of buildings(JGJ 79-2012)[S].Beijing:China Architecture and Building Press,2012.(in Chinese)
[14]逯海,水伟厚.强夯法有效加固深度影响因素的理论分析[J].石河子大学学报,2004,22(4):345~348Lu Hai,Shui Weihou.Analysis on influential factors on dynamic compaction effective consolidation depth[J].Journal of Shihezi University,2004,22(4):345~348.(in Chinese)
[2]任新红.绵阳机场强夯影响深度及有效加固深度研究[J].路基工程,2008,(5):50~51.Ren Xinhong.Study on influence depth and effective depth of improvement under dynamic compaction in Mianyang airport[J].Subgrade Engineering,2008,(5):50~51.(in Chinese)
[3]王铁宏,水伟厚,王亚凌等.强夯法有效加固深度的确定方法与判定标准[J].工程建设标准化,2005,(3):27~38.Wang Tiehong,Shui Weihou,Wang Yaling et al.Determination method and criterion of effective depth of improvement under dynamic consolidation[J].Standardization of Engineering Construction,2005,(3):27~38.(in Chinese)
[4]邵忠心,刘献刚,乐平.强夯地基处理有效加固深度的界定与作用[J].建筑施工,2008,130(11):952~956.Shao Zhongxin,Liu Xiangang,Le Ping.Definition and action of effective consolidation depth of dynamic compaction method for foundation treatment[J].Building Construction,2008,130(11):952~956.(in Chinese)
[5]王铁宏,水伟厚,王亚凌.对高能级强夯技术发展的全面与辩证思考[J].建筑结构,2009,(11):86~89.Wang Tiehong,Shui Weihou,Wang Yaling.Thinking of high energy level dynamic compaction application and development[J].Building Structures,2009,(11):86~89.(in Chinese)
[6]Lukas,Robert G.Densification of loose deposits by pounding[J].ASCE J Geotech Eng Div,1980,106(4):435~446.
[7]李朝晖,郑明军,王涛.某罐区高能级强夯试夯检测与分析[J].工程勘察,2010,(S1):880~886.Li Zhaohui,Zheng Mingjun,Wang Tao.The detection and analysis of high energy level dynamic compaction tests in some petroleum storage tank area[J].Geotechnical Investigation&Surveying,2010,(S1):880~886.(in Chinese)
[8]Chaim J.Poran,Jorge A.Rodriguez.Design of dynamic compaction[J].Can.Geotech,1992,29(5):796~802.
[9]杨海巍,刘珍岩,王志平等.某场地湿陷性黄土地基试夯分析[J].工程勘察,2010,(S1):400~406.Yang Haiwei,Liu Zhenyan,Wang Zhiping et al.Analysis of collapsible loess dynamic compaction test on a certain site[J].Geotechnical Investigation&Surveying,2010,(S1):400~406.(in Chinese)
[10]栾帅,王凤来,水伟厚.残积土回填地基高能级强夯有效加固深度试验研究[J].建筑结构学报,2014,35(10):151~158.Luan Shuai,Wang Fenglai,Shui Weihou.Study of effective depth of high energy level dynamic compaction on backfilled residual soil[J].Journal of Building Structures,2014,35(10):151~158.(in Chinese)
[11]荣韶婧,韩云山,段伟等.强夯法同能级轻锤高落与重锤低落的效果对比[J].施工技术,2014,(S2):110~112.Rong Shaojing,Han Yunshan,Duan Wei et al.Comparative study on light hammer with high drop distance and heavy hammer with low drop distance under the same energy level in dynamic consolidation[J].Construction Technology,2014,(S2):110~112.(in Chinese)
[12]冯世进,胡斌,张旭等.强夯参数对夯击效果影响的室内模型试验[J].同济大学学报,2012,40(8):1147~1153.Feng Shijin,Hu Bin,Zhang Xu et al.Model test study on impact parameters influence on tamping effect[J].Journal of Tongji University,2012,40(8):1147~1153.(in Chinese)
[13]中华人民共和国行业标准.建筑地基处理技术规范(JGJ79-2012)[S].北京:中国建筑工业出版社,2012.The Professional Standards of the Peolpe's Repbulic of China.Technical code for ground treatment of buildings(JGJ 79-2012)[S].Beijing:China Architecture and Building Press,2012.(in Chinese)
[14]逯海,水伟厚.强夯法有效加固深度影响因素的理论分析[J].石河子大学学报,2004,22(4):345~348Lu Hai,Shui Weihou.Analysis on influential factors on dynamic compaction effective consolidation depth[J].Journal of Shihezi University,2004,22(4):345~348.(in Chinese)