客运专线桩复合地基复合模量计算方法探讨
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摘要
客运专线对路基沉降控制较普通铁路更为严格,复合模量作为桩复合地基沉降计算的重要参数,是衡量加固区土层刚度与应力扩散作用重要指标,而目前结合面积加权法获取复合模量计算复合地基沉降值与实测值误差较大,探索更为合理桩复合地基的复合模量计算方法已经成为工程界面临重要课题之一。本文采用弹性力学理论法、剪切位移法等,对桩合地基的复合模量进行修正计算,并将成果应用到甬台温客运专线DK273+300搅拌桩联合插塑板(长板-短桩)多元复合地基断面与DK234+600浆喷桩和布袋桩联合处理软基断面沉降计算分析中。研究结果表明:利用修正公式计算复合模量较利用面积比公式计算值大,且不同修正法得到完全不同的计算值,在沉降中要慎重选取计算方法。研究成果可以为客运专线软土桩复合地基设计提供理论参考。
The control of subgrade settlement for passenger dedicated line is much stricter than that of ordinary railway. As an important parameter of settlement calculation of pile composite foundation,composite modulus is an important index to measure the effect of soil stiffness and stress diffusion in reinforced area. However,at present,the error between the settlement value of composite foundation and the measured value is larger than that obtained by using area weighting method. It has become one of the most important topics in the engineering field to explore a more reasonable method for calculating the composite modulus of pile composite foundation. In this paper,the composite modulus of pile composite foundation is modified and calculated by means of elastic mechanics theory,shear displacement method,etc. The results are applied to the DK273 + 300 mixing pile of Ningbo-Taizhou-Wenzhou Railway. In the calculation and analysis of the settlement for soft foundation treated by grouting pile and bag pile at DK234 + 600,the results show that the composite modulus calculated by modified formula is better than that of using the area ratio formula,and larger than the calculated value of the formula,different modified methods are used to obtain completely different calculation values,and the calculation method should be carefully selected in settlement. The research results can provide a theoretical reference for the design of soft soil pile composite foundation of passenger dedicated line.
The control of subgrade settlement for passenger dedicated line is much stricter than that of ordinary railway. As an important parameter of settlement calculation of pile composite foundation,composite modulus is an important index to measure the effect of soil stiffness and stress diffusion in reinforced area. However,at present,the error between the settlement value of composite foundation and the measured value is larger than that obtained by using area weighting method. It has become one of the most important topics in the engineering field to explore a more reasonable method for calculating the composite modulus of pile composite foundation. In this paper,the composite modulus of pile composite foundation is modified and calculated by means of elastic mechanics theory,shear displacement method,etc. The results are applied to the DK273 + 300 mixing pile of Ningbo-Taizhou-Wenzhou Railway. In the calculation and analysis of the settlement for soft foundation treated by grouting pile and bag pile at DK234 + 600,the results show that the composite modulus calculated by modified formula is better than that of using the area ratio formula,and larger than the calculated value of the formula,different modified methods are used to obtain completely different calculation values,and the calculation method should be carefully selected in settlement. The research results can provide a theoretical reference for the design of soft soil pile composite foundation of passenger dedicated line.
引文
[1]王星运.铁路客运专线路基沉降预测方法研究[D].武汉:中国科学院研究生院武汉岩土力学研究所,2009:72-76.
[2]牛建东.高速铁路桩—网复合地基性状及设计方法研究[D].长沙:中南大学,2006:98-103.
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[5]牛婷婷,刘汉龙,丁选明,等.高铁列车荷载作用下桩网复合地基振动特性模型试验研究[J].岩土力学,2018(3):1-10.
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[8]赵明华,李权,刘猛,等.路堤荷载下考虑地基成层性的复合地基加固区沉降计算[J].水文地质工程地质,2015,42(2):69-76.
[9]程一杰,马利东,刘洋.刚性基础下组合桩复合地基下卧层沉降分析[J].华北科技学院学报,2017,14(5):70-75.
[10]马明正,海振雄,叶阳升,等.高速铁路CFG桩复合地基沉降计算适用方法研究[J].中国铁道科学,2014,35(2):7-13.
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[13]张崇磊.中等压缩性土地区短桩桩网复合地基路基荷载传递规律及沉降机理研究[D].成都:西南交通大学,2015:82-84.
[14]朱奎,魏纲,徐日庆.刚-柔性桩复合地基复合模量的一种解析解[J].岩石力学与工程学报,2008(S1):3104-3109.
[15]王建军,孙建兵.碎石桩复合地基复合模量取值分析[J].中国勘察设计,2012(4):71-73.
[16]单丽萍.无砟轨道高速铁路CFG桩桩—筏复合地基沉降计算[D].长沙:中南大学,2011:52-60.
[17]朱华鹏.中低压缩性地基高铁路基沉降计算研究[D].长沙:中南大学,2013:23-31.
[18]张土乔,龚晓南,曾国熙,等.水泥土桩复合地基复合模量计算[C]∥中国土木工程学会土力学及基础工程学会地基处理学术委员会.中国土木工程学会土力学及基础工程学会地基处理学术委员会第三届地基处理学术讨论会论文集,1992:140-143.
[19]王凤池,朱浮声,王晓初.复合地基复合模量的理论修正[J].东北大学学报,2003,5(5):491-494.
[20]何思明.复合地基压缩模量计算新方法[J].四川建筑科学研究,1997(3):38-40.
[21]邓永锋,刘松玉,洪振舜.水泥土搅拌桩复合地基变形模量确定的一种新方法[J].公路交通科技,2005(3):13-16.
[22]孙林娜.复合地基沉降及按沉降控制的优化设计研究[D].杭州:浙江大学,2006:62-73.
[2]牛建东.高速铁路桩—网复合地基性状及设计方法研究[D].长沙:中南大学,2006:98-103.
[3]顾徐锐.高速铁路无砟轨道桩筏复合地基反力及基床动力响应分析[D].长沙:中南大学,2013:66-73.
[4]肖宏,冯雁,龚小平.桩板结构桩-板-土相互作用模型试验研究[J].岩土力学,2013,34(S2):81-87.
[5]牛婷婷,刘汉龙,丁选明,等.高铁列车荷载作用下桩网复合地基振动特性模型试验研究[J].岩土力学,2018(3):1-10.
[6]郑俊杰,马强,韦永美,等.复合地基沉降计算与数值模拟分析[J].华中科技大学学报(自然科学版),2010,38(8):95-98.
[7]杨光华,徐传堡,李志云,等.软土地基刚性桩复合地基沉降计算的简化方法[J].岩土工程学报,2017,39(S2):21-24.
[8]赵明华,李权,刘猛,等.路堤荷载下考虑地基成层性的复合地基加固区沉降计算[J].水文地质工程地质,2015,42(2):69-76.
[9]程一杰,马利东,刘洋.刚性基础下组合桩复合地基下卧层沉降分析[J].华北科技学院学报,2017,14(5):70-75.
[10]马明正,海振雄,叶阳升,等.高速铁路CFG桩复合地基沉降计算适用方法研究[J].中国铁道科学,2014,35(2):7-13.
[11]李泰灃.高速铁路软土路基桩网复合地基体系沉降分析及对策研究[D].北京:中国铁道科学研究院,2017:45-48.
[12]曹禄来.高速铁路营运期沉降预测分析研究[D].长沙:中南大学,2014:32-44.
[13]张崇磊.中等压缩性土地区短桩桩网复合地基路基荷载传递规律及沉降机理研究[D].成都:西南交通大学,2015:82-84.
[14]朱奎,魏纲,徐日庆.刚-柔性桩复合地基复合模量的一种解析解[J].岩石力学与工程学报,2008(S1):3104-3109.
[15]王建军,孙建兵.碎石桩复合地基复合模量取值分析[J].中国勘察设计,2012(4):71-73.
[16]单丽萍.无砟轨道高速铁路CFG桩桩—筏复合地基沉降计算[D].长沙:中南大学,2011:52-60.
[17]朱华鹏.中低压缩性地基高铁路基沉降计算研究[D].长沙:中南大学,2013:23-31.
[18]张土乔,龚晓南,曾国熙,等.水泥土桩复合地基复合模量计算[C]∥中国土木工程学会土力学及基础工程学会地基处理学术委员会.中国土木工程学会土力学及基础工程学会地基处理学术委员会第三届地基处理学术讨论会论文集,1992:140-143.
[19]王凤池,朱浮声,王晓初.复合地基复合模量的理论修正[J].东北大学学报,2003,5(5):491-494.
[20]何思明.复合地基压缩模量计算新方法[J].四川建筑科学研究,1997(3):38-40.
[21]邓永锋,刘松玉,洪振舜.水泥土搅拌桩复合地基变形模量确定的一种新方法[J].公路交通科技,2005(3):13-16.
[22]孙林娜.复合地基沉降及按沉降控制的优化设计研究[D].杭州:浙江大学,2006:62-73.