输电线路工程中钻埋式微型预制管桩承载力试验研究

Experimental Study on Bearing Capacity of Drilled and Buried miniature Precast Pipe Piles in Transmission Line Engineering

构建的模型结构与原型结构拟合性较差,导致无法获得准确的管桩荷载-沉降曲线,影响管桩承载力测试结果的准确度,为此提出输电线路工程中钻埋式微型预制管桩承载力试验研究方法。构建相似准数方程实现模型结构与原型结构的高度拟合,运用该方程得出在竖向荷载作用力下,管桩自身重力、管桩顶竖向荷载、桩端阻力和桩侧摩擦力的相似性。根据分析结果构建有限元模型,进行桩单元分析,得出管桩的侧阻荷载和端阻荷载的计算结果,并通过水平静载和抗拔静载试验得出不同条件下管桩荷载-位移曲线。实验结果表明,该方法能够得出不同桩径单桩、不同桩数群桩、不同偏斜角度的位移与沉降曲线,并且模拟精准度较高,说明该方法的结果可靠,可以实现对预制管桩承载力特性的准确分析。

Due to the poor fitting between the model structure and the prototype structure,it is impossible to obtain the accurate load settlement curve of the pipe pile,which affects the accuracy of the bearing capacity test results of the pipe pile.Therefore,the test research method of the bearing capacity of the drilling embedded micro prefabricated pipe pile in the transmission line project is proposed.The similarity criterion equation is constructed to realize the height fitting between the model structure and the prototype structure.The similarity of the gravity of the pile itself,the vertical load on the top of the pile,the resistance at the end of the pile and the friction at the side of the pile is obtained by using the equation.According to the analysis results,the finite element model is constructed and the pile element analysis is carried out,and the calculation results of the side resistance load and the end resistance load of the pipe pile are obtained,and the load displacement curve of the pipe pile under different conditions is obtained through the horizontal static load and the pull-out static load test.The experimental results show that the method can obtain the displacement and settlement curves of single pile with different pile diameter,different pile number and different deflection angle,and the simulation accuracy is high,which shows that the method is reliable and can realize the accurate analysis of the bearing capacity characteristics of precast pipe pile.