（铜陵市建筑工程施工图设计文件审查有限公司， 铜陵 244000）

［摘要］《建筑地基基础设计规范》第5.2.7条软弱下卧层验算公式中的pc、pcz、Gk和fak都涉及到地面标高从哪里算起的问题，很多设计人员由于对该公式的推导未进行深入研究，不能正确选择地面标高，设计要么浪费，要么不安全。本文通过对《建筑地基基础设计规范》第5.2.7条软弱下卧层验算公式进行推导，提出计算pc、pcz、Gk和fak时地面标高的正确选择方法，对广大设计人员有一定的参考价值。

［关键词］软弱下卧层； 地面标高； 推导

中图分类号： TU470 文献标识码： A文章编号：  1002-848X(2016)S1-0833-04

Correct use of the formula on the clause 5.2.7 of Code for design of building foundation

Li Guosheng

(Tongling Building Engineering Construction Drawing Design Document Review Co., Ltd., Tongling 244000, China)

Abstract: The pc, pcz, Gk and fak, in the formula of clause 5.2.7 of Code for design of building foundation all involve the issue of the ground elevation from where, Many designers have not conduct the thorough research on the derivation of the formula, thus unable to correctly choose the elevation of the ground,the design is waste or unsafe. Through to the derivation of the formula of clause 5.2.7 of Code for design of building foundation, a correct selection method of the ground elevation when calculating the pc, pcz, pk and fak was put forward, which has certain reference value for the vast number of designers.

Keywords: soft sublayer; ground elevation; derivation

作者简介： 李国胜，学士，高级工程师，Email:693950802@qq.com。