油罐地基双层强夯置换处理效果检测与分析
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摘要
采用底层强夯置换和顶层强夯半置换的分层强夯置换方法处理某1000万t/年炼油工程油罐地基,处理后,采用重型动力触探和超重型动力触探试验,对底层和顶层强夯半置换效果进行了检测;除重型动力触探和超重型动力触探试验手段外,顶层处理后,采用了静载试验测试地基承载特性。结果表明,底层和顶层强夯置换后,有效加固深度、地基承载力和压缩模量均达到了设计要求,岩土体工程特性得到了改善,依托工程地质条件下底层8000/12000k N·m强夯置换和底层5000k N·m强夯半置换有效加固深度分别不小于8m和5m。
Layered dynamic compaction replacement, which included top-layer half-replacement and bottom-layer replacement, was used in oil tank foundation treatment of one 10 million tons/year oil processing project. With heavy dynamic penetration test and super-heavy dynamic penetration test, the compaction effect of bottom-layer replacement and top-layer half-replacement was analyzed. Except those two methods, the compaction effect of top-layer half-replacement were tested with static load test of composite foundation and single pier. The conclusions are as follows: After the dynamic replacement of the bottom layer and the top layer, the effective reinforcement depth, the bearing capacity of the foundation and the compression modulus all meet the design requirements, and the geotechnical engineering characteristics have been improved. Under the engineering geological conditions, the bottom layer is 8000/12000 k Nom. The effective reinforcement depth of the replacement and underlying5000 k Nom strong semi-replacement is not less than 8 m and 5 m, respectively.
Layered dynamic compaction replacement, which included top-layer half-replacement and bottom-layer replacement, was used in oil tank foundation treatment of one 10 million tons/year oil processing project. With heavy dynamic penetration test and super-heavy dynamic penetration test, the compaction effect of bottom-layer replacement and top-layer half-replacement was analyzed. Except those two methods, the compaction effect of top-layer half-replacement were tested with static load test of composite foundation and single pier. The conclusions are as follows: After the dynamic replacement of the bottom layer and the top layer, the effective reinforcement depth, the bearing capacity of the foundation and the compression modulus all meet the design requirements, and the geotechnical engineering characteristics have been improved. Under the engineering geological conditions, the bottom layer is 8000/12000 k Nom. The effective reinforcement depth of the replacement and underlying5000 k Nom strong semi-replacement is not less than 8 m and 5 m, respectively.
引文
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[10]刘红军,吴腾,马江,等.基于孔压监测的强夯置换和砂井-强夯处理饱和软土地基试验研究[J].中国海洋大学学报:自然科学版,2015,45(2):109-114.
[11]陈国栋.分层强夯置换在大型油罐地基处理中的应用[J].建筑结构,2017,47(6):96-101.
[2]马永峰,周丁恒,张志豪,等.大型石化CFG桩复合地基现场试验与数值模[J].中国海洋大学学报,2016,46(1):86-92.
[3]马永峰,钱明,周丁恒,等.大型炼厂软弱地基钻孔灌注桩处理现场试验[J].石油工程建设,2016,41(6):22-30.
[4]马永峰,周丁恒,张志豪,等.大型石化地基振冲碎石桩处理现场试验研究[J].岩土力学,2015,36(1):327-333.
[5]郑凌逶,周风华,谢新宇.强夯置换中碎石运动机制和成墩过程的数值模拟[J].岩土工程学报,2013,35(11):2068-2075.
[6]郑凌逶,周风华.强夯置换软土中碎石墩形成过程的试验研究[J].岩土力学,2014,35(1):90-97.
[7]徐东升,汪稔,孟庆山,等.海相淤泥软土地基强夯置换砂桩试验分析[J].岩土力学,2009,30(12):3831-3836.
[8]白冰,徐华轩,刘海波,等.强夯置换法处理松软土地基若干问题研究[J].岩石力学与工程学报,2010,29(1):3001-3006.
[9]张彧,房建宏,刘建坤,等.强夯置换复合地基加固盐渍土效果的试验研究[J].岩土工程学报,2011,33(1):258-261.
[10]刘红军,吴腾,马江,等.基于孔压监测的强夯置换和砂井-强夯处理饱和软土地基试验研究[J].中国海洋大学学报:自然科学版,2015,45(2):109-114.
[11]陈国栋.分层强夯置换在大型油罐地基处理中的应用[J].建筑结构,2017,47(6):96-101.