南水北调澧河渡槽基桩承载力测试案例分析
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摘要
南水北调澧河渡槽摩擦型基桩设计承载力特征值为14 108 kN,桩长62 m。采用自平衡法和高应变测试法对该工程试验桩进行承载力试验。试验采用自行设计的高应变锤击系统,得到试验岩土层分层侧摩阻力推荐值、桩端阻力推荐值、桩顶位移和单桩极限承载力。自平衡法和高应变法测试结果比较接近,可相互验证。设计的高应变锤击系统是合理、有效的。测试结果对类似工程具有参考价值。
The designed bearing capacity characteristic value of 62 m long frictional pile in Lihe River aqueduct of South-to-North Water Transfer Project is 14 108 kN.The bearing capacity tests are conducted by combining self-balance method with high-strain method.With the self-developed high-strain hammer system is developed,several significant parameters are gained,including the recommended lateral friction of rock and soil layers,the recommended pile end resistance,the pile head displacement and the ultimate bearing capacity of single pile.The results of self-balance method and the high-strain method are much close,and they can verify each other.The high-strain hammer system is reasonable and effective for pile tests.The test results have reference values for similar projects.
The designed bearing capacity characteristic value of 62 m long frictional pile in Lihe River aqueduct of South-to-North Water Transfer Project is 14 108 kN.The bearing capacity tests are conducted by combining self-balance method with high-strain method.With the self-developed high-strain hammer system is developed,several significant parameters are gained,including the recommended lateral friction of rock and soil layers,the recommended pile end resistance,the pile head displacement and the ultimate bearing capacity of single pile.The results of self-balance method and the high-strain method are much close,and they can verify each other.The high-strain hammer system is reasonable and effective for pile tests.The test results have reference values for similar projects.
引文
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[2]焦莹.软弱土中大深度后压浆地下连续墙竖向承载力试验研究[J].土木工程学报,2008,41(3):84–90.(JIAO Ying.Full-scale loadingtests on vertical bearing capacity of deep diaphragm wall withpost-installation base-grouting[J].China Civil Engineering Journal,2008,41(3):84–90.(in Chinese))
[3]于清泉,龚维明,薛国亚,等.澳门桩基规范的讨论[J].岩石力学与工程学报,2008,27(2):303–308.(YU Qingquan,GONGWeiming,XUE Guoya,et al.Discussion on Macao pile foundationcode[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(2):303–308.(in Chinese))
[4]马晔,宋春霞.大吨位桩基荷载试验技术及其在工程中的应用[J].世界地震工程,2010,26(增):221–224.(MAYe,SONG Chunxia.The technology and application for large tonnage static loading testsof piles[J].World Earthquake Engineering,2010,26(Supp.):221–224.(in Chinese))
[5]陈安国,刘东甲.基桩高应变检测的拟合方法研究[J].工程地球物理学报,2008,5(2):215–221.(CHENAnguo,LIU Dongjia.Studyon matching calculation for high strain test piles[J].Chinese Journalof Engineering Geophysics,2008,5(2):215–221.(in Chinese))
[6]王建军,彭振斌,刘睦峰,等.大口径超深孔桩基轴向静荷载试验研究[J].中南大学学报:自然科学版,2011,42(5):1419–1424.(WANG Jianjun,PENG Zhenbin,LIU Mufeng,et al.Diameter axialstatic loading test about large-diameter ultra-deep-hole pile foundation[J].Journal of Central South University:Science and Technology,2011,42(5):1 419–1 424.(in Chinese))
[7]胡柏学,袁铜森,杨春林,等.静载试验与自平衡法在岩溶地区应用对比分析[J].公路工程,2009,34(5):1–4.(HU Baixue,YUANTongsen,YANG Chunlin,et al.Comparative study on the applicationof static test method and load cell method in karst area[J].HighwayEngineering,2009,34(5):1–4.(in Chinese))
[8]于清泉,龚维明,梁书亭.卵石地区自平衡深层荷载试验的应用[J].岩石力学与工程学报,2010,29(增2):3847–3851.(YU Qingquan,GONG Weiming,LIANG Shuting.Application of self-balance deeplevel load test in pebble bed area[J].Chinese Journal of RockMechanics and Engineering,2010,29(Supp.2):3 847–3 851.(inChinese))
[9]中华人民共和国行业标准编写组.JGJ94—2008建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.(The ProfessionalStandards Compilation Group of People s Republic of China.JGJ 94—2008 Technical code for building pile foundations[S].Beijing:ChinaArchitecture and Building Press,2008.(in Chinese))
[10]中华人民共和国国家标准编写组.GB50007—2002建筑地基基础设计规范[S].北京:中国建筑工业出版社,2002.(The NationalStandards Compilation Group of People′s Republic of China.GB50007—2002 Code for design of building foundation[S].Beijing:China Architecture and Building Press,2002.(in Chinese))
[11]中华人民共和国行业标准编写组.JT/T738—2009基桩静载试验——自平衡法[S].北京:人民交通出版社,2009.(TheProfessionalStandards Compilation Group of People′s Republic of China.JT/T738—2009 Static loading test of foundation pile—self-balancedmethod[S].Beijing:China Communications Press,2009.(in Chinese))
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