桩板结构路基沉降计算方法及对既有桩基侧摩阻力的影响
|
摘要
基于Boussinesq理论推导了桩板结构路基沉降计算解析解,采用佐藤悟双折线模型构建了既有桩基荷载传递函数,分析了荷载传递函数对既有高速铁路桥梁桩基侧摩阻力的影响。以桩板结构路基下穿高速铁路桥梁工程为例,分别采用理论方法和FLAC 3D数值计算得到了桩板结构路基沉降变形规律和既有桥梁桩基侧摩阻力分布特点。将解析解与数值计算结果进行对比,二者接近,说明本文提出的桩板结构路基沉降计算解析解和桩基荷载传递函数可行。
Based on Boussinesq theory,an analytical solution was deduced for settlement calculation of pile-plank structure.The load transfer function of existing pile foundation was constructed by using Sato's double-broken-line model,and the influence ofload transfer function on side friction resistance of existing pile foundation in high speed railway bridge was analyzed.Taking the pile-plank structure subgrade crossing the high speed railway bridge project as an example,the settlement and deformation lawof pile-plank structure subgrade and the distribution characteristics of side friction resistance of existing bridge pile foundation were obtained by theoretical solution and FLAC 3 D numerical calculation respectively. C omparing the analytical solution with the numerical result,the two results are close,which shows that the analytical solution and the load transfer function of pile foundation for the settlement calculation of pile-plank structure subgrade proposed in this paper are feasible.
Based on Boussinesq theory,an analytical solution was deduced for settlement calculation of pile-plank structure.The load transfer function of existing pile foundation was constructed by using Sato's double-broken-line model,and the influence ofload transfer function on side friction resistance of existing pile foundation in high speed railway bridge was analyzed.Taking the pile-plank structure subgrade crossing the high speed railway bridge project as an example,the settlement and deformation lawof pile-plank structure subgrade and the distribution characteristics of side friction resistance of existing bridge pile foundation were obtained by theoretical solution and FLAC 3 D numerical calculation respectively. C omparing the analytical solution with the numerical result,the two results are close,which shows that the analytical solution and the load transfer function of pile foundation for the settlement calculation of pile-plank structure subgrade proposed in this paper are feasible.
引文
[1]杨斌.桩板结构技术在高铁施工中的实践探究[J].工程建设与设计,2017(2):96-97.
[2]沈宇鹏,李小和,冯瑞玲,等.客运专线桩板结构复合地基的沉降特性[J].交通运输工程学报,2009,9(6):32-35.
[3]荆志东,郭永春,邱恩喜,等.新型桩板结构对高速铁路软基沉降控制作用离心试验[J].岩土力学,2010,31(8):2565-2569.
[4]WANG X,SU Q,XIAO H.Field Test Research of Pile-plank Structure on Zhengzhou-Xi'an High-speed Rail[J].Advanced Materials Research,2011,354/355:109-113.
[5]李传宝,程谦恭,梁鑫,等.采空巷道上方高速铁路桩板路基模型试验研究[J].岩土力学,2014,35(11):3101-3110.
[6]CHEN H,XU S H,ZHANG B Q.Reinforcement Effectiveness Analysis of Road Pile-plank Structure in Soft Soil Area[J].Applied Mechanics&Materials,2014,482:227-232.
[7]代汉超,冯征远.新建连镇铁路桩板结构下穿京沪高铁影响分析[J].福建建筑,2017(11):68-70.
[8]杨红春.新建道路下穿高速铁路桥梁对高铁桥墩和桩基影响的分析[J].中国市政工程,2016(2):7-9.
[9]赵明华,贺炜,曹文贵.基桩负摩阻力计算方法初探[J].岩土力学,2004,25(9):1442-1446.
[10]贾煜,宋福贵,王炳龙,等.基于改进荷载传递法计算降水引起的基桩沉降[J].岩土力学,2015,36(1):68-74.
[11]王卫东,李永辉,吴江斌.超长灌注桩桩-土界面剪切模型及其有限元模拟[J].岩土力学,2012,33(12):3818-3824,3832.
[2]沈宇鹏,李小和,冯瑞玲,等.客运专线桩板结构复合地基的沉降特性[J].交通运输工程学报,2009,9(6):32-35.
[3]荆志东,郭永春,邱恩喜,等.新型桩板结构对高速铁路软基沉降控制作用离心试验[J].岩土力学,2010,31(8):2565-2569.
[4]WANG X,SU Q,XIAO H.Field Test Research of Pile-plank Structure on Zhengzhou-Xi'an High-speed Rail[J].Advanced Materials Research,2011,354/355:109-113.
[5]李传宝,程谦恭,梁鑫,等.采空巷道上方高速铁路桩板路基模型试验研究[J].岩土力学,2014,35(11):3101-3110.
[6]CHEN H,XU S H,ZHANG B Q.Reinforcement Effectiveness Analysis of Road Pile-plank Structure in Soft Soil Area[J].Applied Mechanics&Materials,2014,482:227-232.
[7]代汉超,冯征远.新建连镇铁路桩板结构下穿京沪高铁影响分析[J].福建建筑,2017(11):68-70.
[8]杨红春.新建道路下穿高速铁路桥梁对高铁桥墩和桩基影响的分析[J].中国市政工程,2016(2):7-9.
[9]赵明华,贺炜,曹文贵.基桩负摩阻力计算方法初探[J].岩土力学,2004,25(9):1442-1446.
[10]贾煜,宋福贵,王炳龙,等.基于改进荷载传递法计算降水引起的基桩沉降[J].岩土力学,2015,36(1):68-74.
[11]王卫东,李永辉,吴江斌.超长灌注桩桩-土界面剪切模型及其有限元模拟[J].岩土力学,2012,33(12):3818-3824,3832.