硅藻土地层钻孔灌注桩承载特性研究  

A Study on Bearing Capacity of Bored Piles in Diatomite Stratum

作　　者：康银庚 KANG Yingeng(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《高速铁路技术》2023年第4期30-34,共5页High Speed Railway Technology

基　　金：中国铁路设计集团有限公司科技开发应用研究类重点课题(721812)。

摘　　要：依托杭台高速铁路工程,在硅藻土地区开展了钻孔灌注桩静载荷试验,获得了硅藻土地层中灌注桩承载特性及相关力学参数,结果表明:(1)在静载试验条件下对桩身应力变形进行测试,得到了硅藻土地层灌注桩桩身荷载传递的基本规律;(2)通过对桩身轴力和侧摩阻力的计算,得到了白色、兰色和黑色3种硅藻土的极限摩阻力;(3)3种硅藻土的极限摩阻力与基本承载力间并非线性对应关系,兰色硅藻土虽具有较好的抗压性能,但其抗摩擦性能并未大幅度提高;(4)工程设计中桩端应尽量避免设置于硅藻土地层中。研究成果可为硅藻土地层桩基或类似工程的设计参数取值提供参考。Based on the Hangzhou-Taizhou high-speed railway project,a static load test was carried out on bored piles in diatomite stratum to obtain their bearing capacity and related mechanical parameters.The test results include:(1)The basic law of load transfer in bored piles in diatomite stratum was obtained in the stress and deformation test of the pile shaft under static load test conditions;(2)The ultimate friction resistance of white,blue and black diatomite was obtained by calculating the axial force and skin friction of the pile shaft;(3)The relationship between the ultimate friction resistance and the basic bearing capacity of the three kinds of diatomite is nonlinear.Although blue diatomite has good compressive performance,its anti-friction performance does not improve greatly;(4)In engineering design,the pile tip shall not be set in the diatomite stratum as far as possible.The findings can provide a reference for determining the value of design parameters of pile foundations in diatomite stratum or similar projects.

关 键 词：硅藻土地层 静载荷试验 极限摩阻力 承载特性 

分 类 号：TU473.16[建筑科学—结构工程]