十字板抗剪强度换算软基加固强度的公式对比

Comparison of formulas for calculating strength of soft foundation reinforcement by shear strength of vane test

目前国家标准和水运工程相关检测规范中,未明确十字板抗剪强度和地基承载力的换算关系,导致利用十字板剪切试验检测地基承载力的评价标准不统一。通过对岩土勘察、公路、铁路基础设计规范中十字板抗剪强度换算地基承载力的公式进行对比,并以某软基加固检测工程为例,运用多种公式进行承载力的计算和验证。结果表明,根据《建筑地基基础设计规范》推导的简化公式更适用于软基处理加固效果的评价,可作为十字板剪切试验检测软基加固承载力的验收依据。

There is no clear conversion relationship between the shear strength of vane test and the bearing capacity of the foundation in the current national standards and relevant detection standards of water transport engineering,which leads to the inconsistency of the evaluation criteria of the bearing capacity of the foundation by vane test.This paper compares the conversion formulas for estimating the bearing capacity of foundation by shear strength of vane test in the codes of geotechnical investigation,highway and railway foundation design.Taking an example of soft foundation reinforcement and testing project,this paper estimates and verifies the bearing capacity by various formulas.The results show that the simplified formula deduced in accordance with Code for Design of Building Foundation is more suitable for evaluating the reinforcement effect of soft foundation treatment,and can be used as the basis for checking the bearing capacity of soft foundation reinforcement by vane test.