Study on Reasonable Value of Proportional Coefficient of Pile Foundation of High-speed Railway Bridge in Soft Soil Area
In the design of high-speed railway bridges,it is important to select a reasonable value of the proportional coefficient m of the bridge pile foundation coefficient.Therefore,based on the railway project of Tianjin Binhai New Area,the horizontal static load test of single pile and pile group is carried out,and the horizontal displacement variation law of single pile end and pile group cap under different horizontal loads is analyzed.Finally,based on the test results,the proportional coefficient m of the horizontal resis-tance coefficient of foundation soil is calculated and fitted,and the reasonable value of m in soft soil area is given.The results show that the critical load of Z1 single pile is about 360kN,that of Z2 is 220kN,that of Z1 single pile is 500kN and that of Z2 is 300kN.The maximum horizontal load of pile groups is 760kN,and the peak displacement of the top of pile caps is 1.582 mm.The m curves of single pile and pile group are close,and with the increase of displacement,the m decreases exponentially.According to the fitting re-sults,the m of single pile is estimated,and it is suggested that the m of single pile should be 10MN/m4 and the m of pile group should be 2.6MN/m4.Compared with the code,the m of single pile is larger,while the m of pile group is slightly smaller.
high-speed rail bridgepile foundationfield testproportional coefficient of foundation coeffi-cient
NETL
NSTL
万方数据
维普
