基于黄河冲洪积地层试桩试验优化桩基承载力设计的研究
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摘要
以山东东营某工程为例,基于黄河冲洪积地层试桩试验成果,对试桩试验、试桩单桩极限承载力实测值与预估值相差较大(6.36%～20.19%)的原因进行分析。建立在相同桩顶标高(-5.7m)条件下单桩极限承载力实测平均值与桩底标高(可以换算成桩长)的关系曲线,对工程桩桩基承载力设计方法进行优化。根据桩基检测结果,优化后的工程桩在相同桩长、桩径条件下单桩极限承载力实测值与预估值承载力相比提高约10%,达到发掘地质条件的潜力、减少桩数、节省工程造价的目的。相关试验方法、优化桩基承载力设计的方法可为类似地质条件的工程设计及建立区域桩基承载力数据库提供借鉴。
Taking aproject in Dongying as an example,and based on the test results of test piles in the Yellow River flood alluvial formation,the relation curve between the measured average value of the ultimate bearing capacity of single pile and the height of the pile bottom(which can be converted into pile length)under the condition of the same pile top elevation(-5.7 m)is set up.Analysis is made of the test pile test and the big difference(6.36%～20.19%)between the measured value and the predicted value of the ultimate bearing capacity of the single pile.The reasons and the optimal design method of pile foundation bearing capacity are introduced.According to the test results of the pile foundation,the measured value of the ultimate bearing capacity of the single pile under the same length and diameter of the pile is about 10% greater than the predicted bearing capacity,which can exploit the potential of the geological conditions,reduce the number of piles and save the cost of the project.Relevant test methods and methods of optimizing the pile bearing capacity design can provide reference for engineering design under similar geological conditions and the establishment of regional pile bearing capacity database.
Taking aproject in Dongying as an example,and based on the test results of test piles in the Yellow River flood alluvial formation,the relation curve between the measured average value of the ultimate bearing capacity of single pile and the height of the pile bottom(which can be converted into pile length)under the condition of the same pile top elevation(-5.7 m)is set up.Analysis is made of the test pile test and the big difference(6.36%～20.19%)between the measured value and the predicted value of the ultimate bearing capacity of the single pile.The reasons and the optimal design method of pile foundation bearing capacity are introduced.According to the test results of the pile foundation,the measured value of the ultimate bearing capacity of the single pile under the same length and diameter of the pile is about 10% greater than the predicted bearing capacity,which can exploit the potential of the geological conditions,reduce the number of piles and save the cost of the project.Relevant test methods and methods of optimizing the pile bearing capacity design can provide reference for engineering design under similar geological conditions and the establishment of regional pile bearing capacity database.
引文
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[10]贺诗选,张娇,李强.根据试桩成果反分析灌注桩的设计参数[J].探矿工程(岩土钻掘工程),2012,39(8):61-64.HE Shixuan,ZHANG Jiao,LI Qiang.Inverse analysis on design parameters of bored grouting pile according to the pile testing results[J].Exploration Engineering(Rock&Soil Drilling and Tunneling),2012,39(8):61-64.
[11]王文鹏,张小东.曹妃甸某大型工程钻孔灌注桩试桩施工及检测结果分析[J].探矿工程(岩土钻掘工程),2011,38(7):57-62.WANG Wenpeng,ZHANG Xiaodong.Pile test construction for bored-grouting pile of a large engineering in Caofeidian and the analysis on testing result[J].Exploration Engineering(Rock&Soil Drilling and Tunneling),2011,38(7):57-62.
[12]樊清禄.桩基静载荷试验方案的对比[J].山西建筑,2017,43(36):76-78.FAN Qinglu.Comparison of static load test scheme of pile foundation[J].Shanxi Architecture,2017,43(36):76-78.
[13]陈红玲,曹庆霞.桩基优化设计经济效益分析[J].探矿工程(岩土钻掘工程),2014,41(7):70-72.CHEN Hongling,CAO Qingxia.Analysis on economic benefit of optimal design of pile foundation[J].Exploration Engineering(Rock&Soil Drilling and Tunneling),2014,41(7):70-72.
[14]江小兵,吴红兵,张浩博.深层平板和单桩竖向抗压静载试验的对比分析[J].探矿工程(岩土钻掘工程),2018,45(1):84-88.JIANG Xiaobing,WU Hongbing,ZHANG Haobo.Comparative analysis on the deep plate test and single pile vertical compressive static load test[J].Exploration Engineering(Rock&Soil Drilling and Tunneling),2018,45(1):84-88.
[2]吴群昌.西安地区钢筋混凝土钻孔灌注桩试桩试验研究[J].城市勘测,2014,(4):172-176.WU Qunchang.An experimental research on reinforced concrete drill-hole pile testing of the third ring road system in Xi’an city[J].Urban Geotechnical Investigation&Surveying,2014,(4):172-176.
[3]柯洪,吴翔,王继华,等.天津厚地层超长钻孔灌注桩单桩承载特性研究[J].岩土力学,2011,32(9):2821-2826.KE Hong,WU Xiang,WANG Jihua,et al.Research on vertical bearing capacity of single super-long bored pile in thick stratum of Tianjin[J].Rock and Soil Mechanics,2011,32(9):2821-2826.
[4]王申.桩基静载荷试验实例分析[J].价值工程,2015,34(31):111-113.WANG Shen.Analysis on the test cases of pile foundation static load[J].Value Engineering,2015,34(31):111-113.
[5]王美云,顾国荣,陈晖,等.某桩基工程优化设计实例[J].勘察科学技术,2004,(6):41-42,48.WANG Meiyun,GU Guorong,CHEN Hui,et al.A case history of a pile foundation project for optimal design[J].Site Investigation Science and Technology,2004,(6):41-42,48.
[6]孙宏伟.京津沪超高层超长钻孔灌注桩试验数据对比分析[J].建筑结构,2011,41(9):143-146.SUN Hongwei.Compare analysis on loading test data of ultralong bored piles in Beijing,Tianjin and Shanghai[J].Building Structure,2011,41(9):143-146.
[7] JGJ 106-2014,建筑基桩检测技术规范[S].JGJ 106-2014,Technical code for testing of building foundation piles[S].
[8]祝磊,孔思丽,曹小兵.某钻孔灌注桩基静载荷试验分析[J].贵州工业大学学报(自然科学版),2005,34(4):84-87.ZHU Lei,KONG Sili,CAO Xiaobing.Analysis of the static loading tests of bored piles[J].Journal of Guizhou University of Technology(Natural Science Edition),2005,34(4):84-87.
[9]姚泽良.竖向荷载作用下单桩极限承载力计算方法的研究[D].陕西西安:西安理工大学,2003.YAO Zeliang.Calculating ultimately bearing capacity of vertically loading single pile[D].Xi’an Shaanxi:Xi’an University of Technology,2003.
[10]贺诗选,张娇,李强.根据试桩成果反分析灌注桩的设计参数[J].探矿工程(岩土钻掘工程),2012,39(8):61-64.HE Shixuan,ZHANG Jiao,LI Qiang.Inverse analysis on design parameters of bored grouting pile according to the pile testing results[J].Exploration Engineering(Rock&Soil Drilling and Tunneling),2012,39(8):61-64.
[11]王文鹏,张小东.曹妃甸某大型工程钻孔灌注桩试桩施工及检测结果分析[J].探矿工程(岩土钻掘工程),2011,38(7):57-62.WANG Wenpeng,ZHANG Xiaodong.Pile test construction for bored-grouting pile of a large engineering in Caofeidian and the analysis on testing result[J].Exploration Engineering(Rock&Soil Drilling and Tunneling),2011,38(7):57-62.
[12]樊清禄.桩基静载荷试验方案的对比[J].山西建筑,2017,43(36):76-78.FAN Qinglu.Comparison of static load test scheme of pile foundation[J].Shanxi Architecture,2017,43(36):76-78.
[13]陈红玲,曹庆霞.桩基优化设计经济效益分析[J].探矿工程(岩土钻掘工程),2014,41(7):70-72.CHEN Hongling,CAO Qingxia.Analysis on economic benefit of optimal design of pile foundation[J].Exploration Engineering(Rock&Soil Drilling and Tunneling),2014,41(7):70-72.
[14]江小兵,吴红兵,张浩博.深层平板和单桩竖向抗压静载试验的对比分析[J].探矿工程(岩土钻掘工程),2018,45(1):84-88.JIANG Xiaobing,WU Hongbing,ZHANG Haobo.Comparative analysis on the deep plate test and single pile vertical compressive static load test[J].Exploration Engineering(Rock&Soil Drilling and Tunneling),2018,45(1):84-88.