自平衡法和锚桩法在高铁工程中的对比试验分析

为了准确快速地测试高架桥基桩承载性能,分析自平衡法试桩与传统锚桩法在工程应用中的异同,在哈大客运专线桥梁工程中,采用自平衡法与锚桩法进行了2根基桩原位试验,测试对比了荷载分担比例、轴力分布形态和桩侧阻力-位移曲线形态等.结果表明,在以桩侧阻力为主的荷载水平下,2种测试方法均反映了基桩承载力和变形特性,在匀质土层中两者结果更为接近,自平衡法在验证基桩承载力时可以替代传统方法,其精度能够满足工程应用要求.

Research on in situ tests between self balanced method and anchor pile method in high speed railway

Construction of high speed rail requests accurate and convenient pile test method.To analyze the differences between the self balanced method and the anchor pile method in applications, this paper researched the application of the self balanced method in bridges of Harbin Dalian railway, in compared with the anchor pile method. By comparing the Load sharing proportion, Force distribution pattern and shaft resistance displacement curve,both tests accurately reflects the bearing capacity and deformation characteristics of the pile when the shaft resistance is the main capacity, especially in homogeneous soil. The self balanced method in the verification of pile bearing capacity can be an alternative to the traditional methods, and its accuracy can meet the engineering requirements.