砂土地基扩底基础抗拔承载力计算方法对比

›› 2018, Vol. 32 ›› Issue (4): 424-427.

砂土地基扩底基础抗拔承载力计算方法对比

曾二贤1，叶爱民1，陈成2，刘观仕2，冯衡1

（1.中国电力工程顾问集团中南电力设计院有限公司，武汉 430071；
2.中国科学院武汉岩土力学研究所，武汉 430071）

收稿日期:2017-05-09 修回日期:2017-12-26 出版日期:2018-08-20 发布日期:2018-08-23
作者简介:曾二贤（1984-），男，高级工程师，硕士，研究方向为电力工程设计与研究。
基金资助:
中国电力工程顾问集团科技项目（DG1-T08-2014）；中南电力设计院有限公司大型科技项目（40-2B-KY201419-T01）

Comparative Study on the Methods for the Uplift Capacity of Spread Footings in Sand

ZENG Erxian1,YE Aimin1, CHEN Cheng2, LIU Guanshi2, FENG Heng1

(1.Central Southern China Electric Power Design Institute Co., Ltd., China Power Engineering Consulting Group, Wuhan 430071；
2.Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071)

Received:2017-05-09 Revised:2017-12-26 Online:2018-08-20 Published:2018-08-23

摘要/Abstract

摘要： 在大量实测数据的基础上，评价了我国现行规范《架空输电线路基础设计技术规程》（DL/T 5219-2014）中土重法和剪切法在计算砂土中扩底基础极限上拔承载力的精度。分析结果表明，我国（DL/T 5219-2014）规范中板柱基础土重法和剪切法在砂土中上拔基础的临界深度定义相对保守。据此，对规范中给出的临界深度进行了修正。修正后的剪切法和土重法计算结果均要大于修正前的结果，且与实测结果吻合的较好。此外，从与实测值吻合度以及设计安全两方面考虑，修正后土重法更具优势。

关键词: 板柱基础, 砂土；上拔承载力；临界深度

Abstract: Based on the existing measured data, the calculation precision of earth cone method and shear method for calculating the ultimate uplift capacity of the spread foundation in sand recommended in “Technical Code for Foundation Design of Overhead Transmission Line” (DL/T 52192014) was evaluated in this paper. It is shown that the values of critical depth defined in the two methods are too small. A correspondent improvement against the critical depth was therefore given based on the previous studies. The values of ultimate uplift capacity obtained from the modified earth cone method and the modified shear method were all greater than those of the uncorrected results. The calculated results agreed well with the measured results. In addition, from the point of the degree of coincidence and safety design, the modified earth cone method is preferable.

Key words: Slab Column Foundation, Sandy Soils, Uplift capacity, Critical Depth

曾二贤1，叶爱民1，陈成2，刘观仕2，冯衡1. 砂土地基扩底基础抗拔承载力计算方法对比[J]. , 2018, 32(4): 424-427.

ZENG Erxian1,YE Aimin1, CHEN Cheng2, LIU Guanshi2, FENG Heng1. Comparative Study on the Methods for the Uplift Capacity of Spread Footings in Sand[J]. , 2018, 32(4): 424-427.