岩土工程学报Issue(z2)：130-135,6.DOI:10.11779/CJGE2014S2022
关于《建筑基坑支护技术规程》中锚杆刚度系数计算的探讨
Formula for rigidity coefficient of soil anchor in“Technical specification for retaining and protection of building foundation excavations”
聂子云 1谭小兵 1王正松 1李凤翔2
作者信息
- 1. 铁道第三勘察设计院集团有限公司，天津 300251
- 2. 中铁工程设计咨询集团有限公司，北京 100055
- 折叠
摘要
Abstract
The formula for rigidity coefficient of soil anchor is given by“Technical specification for retaining and protection of building foundation excavations”(JGJ120-2012). The authors considers that there are two defects in the formula: firstly, the longer length of fixed anchor, the smaller rigidity coefficient of soil anchor, secondly, the rigidity coefficient of soil anchor is dependent only on the material parameters and sizes of bolt and independent of the properties of the surrounding soils. The distribution of frictional resistance along anchorage section is oversimplified in the derivation process of the formula, which cannot truly reflect the load transfer mechanism of anchor. Starting from the cooperation deformation of anchorage section and the surrounding soils, similar to the Winkler foundation model, the action of the surrounding soils against bolt is simplified as a series of shear springs, by introducing the shear stiffness coefficient, a new rigidity coefficient of formula for soil anchor is obtained by establishing force equilibrium equation of anchorage section. Unlike the old one, the new formula shows that the rigidity coefficient of soil anchor increases with the length of anchorage section, but the growth rate is reduced, meanwhile, the rigidity coefficient is closely related to the properties of the surrounding soils.关键词
岩土锚杆/刚度系数/锚固段/切向弹簧/协同变形/剪应力Key words
soil anchor/rigidity coefficient/anchorage section/shear spring/cooperation deformation/shear stress分类
建筑与水利引用本文复制引用
聂子云,谭小兵,王正松,李凤翔..关于《建筑基坑支护技术规程》中锚杆刚度系数计算的探讨[J].岩土工程学报,2014,(z2):130-135,6.
