振冲碎石桩与充水预压联合处理地震区深厚软土地基
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摘要
采用振冲碎石桩与充水预压法对SKIKADA炼油厂场地进行联合地基处理。在分析场区工程地质条件的基础上,选用振冲碎石桩与充水预压联合地基处理方案,并对施工方案进行设计;经过现场振冲碎石桩试桩试验,进一步优化振冲碎石桩的桩长和桩位分布;在充水预压施工过程中,实时进行土体位移和孔隙水压力的动态监测,严格执行信息化施工。结果表明,处理后,复合地基承载力达260kPa,灌体运营期间沉降量为270mm,振冲碎石桩与充水预压联合法能够有效、经济地处理地震区深厚软土地基。
Vibrofluctuation crushed stone (VCS) piles combined with preloading was chosen to treat the SKIKADA refinery sub-grade. Based on the engineering geological conditions in site, the preliminary designs of VCS Pile and preloading were done respectively. The length and layout of VCS piles was optimized by the VCS pile test in site. In the meantime, the dynamic monitoring of soil displacement and pore water pressure was carried out timely, and the loading was controlled strictly on information during preloading. The results show that the composite sub-grade bearing capacity reaches 260 kPa and the total settlement during operation in the future will be 270 mm after preloading treatment, and that the deep and thick soft strata in seismic region can be improved effectively and economically by the VCS piles combined with preloading.
Vibrofluctuation crushed stone (VCS) piles combined with preloading was chosen to treat the SKIKADA refinery sub-grade. Based on the engineering geological conditions in site, the preliminary designs of VCS Pile and preloading were done respectively. The length and layout of VCS piles was optimized by the VCS pile test in site. In the meantime, the dynamic monitoring of soil displacement and pore water pressure was carried out timely, and the loading was controlled strictly on information during preloading. The results show that the composite sub-grade bearing capacity reaches 260 kPa and the total settlement during operation in the future will be 270 mm after preloading treatment, and that the deep and thick soft strata in seismic region can be improved effectively and economically by the VCS piles combined with preloading.
引文
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[11]徐青松,沈荣根,陈舟.振冲碎石桩技术在汤浦堆石坝软黏土地基处理中的应用[J].水利水运工程学报,2004(4):50·53.XU Qing-song,SHEN Rong-gen,CHEN Zhou.Application of vibration stone pile technique in soft clay foundation development of Tangpu rockfill dam[J].Hydro-Science and Engineering,2004(4):50·53.
[12]徐琼梅.10万m3大型油罐软土地基的综合治理[J].岩土工程界,2005,7(5):64·65.XU Qiong-mei.Soft soil ground treatment for1×105m3large-scale oil storage tank[J].Geotechnical Engineering World,2005,7(5):64·65.
[13]赵同顺,周波.大型油罐地基变形特性的研究[J].岩石力学与工程学报,2004,23(6):1037·1043.ZHAO Tong-xun,ZHOU Bo.Deformation behaviors of soft foundation under large oil tank[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(6):1037·1043.
[14]贾庆山.振冲与充水预压综合处理大型油罐软地基工程实例综述[J].石油工程建设,1996(2):7·10.JIA Qing-shan.Example for soft sub-grade treatment of large oil tank using VCS piling&preloading[J].Petroleum Engineering Construction,1996(2):7·10.
[2]地基处理手册编写委员会.地基处理手册[M].北京:中国建筑工业出版社,2000.Compiling Committee of Handbook of Groundwork Treatment.Handbook of groundwork treatment[M].Beijing:China Architecture and Building Press,2000.
[3]高加成,刘恒武.碎石桩·强夯联合法加固湖区填土地基[J].湖南科技大学学报:自然科学版,2005,20(1):49·51.GAO Jia-cheng,LIU Heng-wu.Reinforcing soil around lake with gravel pile and dynamic compaction[J].Journal of Hunan University of Science&Technology:Natural Science Edition,2005,20(1):49·51.
[4]姚琪阳.碎石桩复合地基承载机理及优化设计研究[D].长沙:湖南大学土木工程学院,2004.YAO Qi-yang.Study on work mechanics and optimization design of gravel pile composite foundation[D].Changsha:College of Civil Engineering,Hunan University,2004.
[5]龚晓南.复合地基设计和施工指南[M].北京:人民交通出版社,2003:109·110.GONG Xiao-nan.Design and construction guide of composite foundation[M].Beijing:People Transportation Press,2003:109·110.
[6]赵明,赵明华,陈昌富.确定碎石桩复合地基桩土应力比的一种新方法[J].湖南大学学报:自然科学版,2002,29(2):112·116.ZHAO Ming,ZHAO Ming-hua,CHEN Chang-fu.New pile-soil stress ratio calculation method in gravel-pile composite foundation[J].Journal of Hunan University:Natural Sciences,2002,29(2):112·116.
[7]周波,杨庆光,张可能.刚性基础下柔性桩复合地基有效桩长的计算方法[J].中南大学学报:自然科学版,2007,38(1):175·179.ZHOU Bo,YANG Qing-guang,ZHANG Ke-neng.Calculation method for effective length of flexible piles for composite foundation with rigid foundation[J].Journal of Central South University:Science and Technology,2007,38(1):175·179.
[8]Han J,Gabr M A.Numerical analysis of geosynthetic reinforced and pile supported earth platforms over soft soil[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2002,128(1):44·53.
[9]张晓光,曹永华.振冲碎石桩法在高液限软黏土地基处理中的应用[J].中国港湾建设,2007(3):36·37.ZHANG Xiao-guang,CAO Yong-hua.Application of vibro-replacement crushed stone columns for improvement of soft clay with high liquid limit[J].China Harbour Engineering,2007(3):36·37.
[10]黄宝龙,刘冶,李波.某工程振冲碎石桩处理效果试验研究[J].施工技术,2005(S1):28·31.HUANG Bao-long,LIU Ye,LI Bo.Study on treatment effect of vibro-replacement stone piles in practical project[J].Construction Technology,2005(S1):28·31.
[11]徐青松,沈荣根,陈舟.振冲碎石桩技术在汤浦堆石坝软黏土地基处理中的应用[J].水利水运工程学报,2004(4):50·53.XU Qing-song,SHEN Rong-gen,CHEN Zhou.Application of vibration stone pile technique in soft clay foundation development of Tangpu rockfill dam[J].Hydro-Science and Engineering,2004(4):50·53.
[12]徐琼梅.10万m3大型油罐软土地基的综合治理[J].岩土工程界,2005,7(5):64·65.XU Qiong-mei.Soft soil ground treatment for1×105m3large-scale oil storage tank[J].Geotechnical Engineering World,2005,7(5):64·65.
[13]赵同顺,周波.大型油罐地基变形特性的研究[J].岩石力学与工程学报,2004,23(6):1037·1043.ZHAO Tong-xun,ZHOU Bo.Deformation behaviors of soft foundation under large oil tank[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(6):1037·1043.
[14]贾庆山.振冲与充水预压综合处理大型油罐软地基工程实例综述[J].石油工程建设,1996(2):7·10.JIA Qing-shan.Example for soft sub-grade treatment of large oil tank using VCS piling&preloading[J].Petroleum Engineering Construction,1996(2):7·10.
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