Formula for rigidity coefficient of soil anchor in “Technical specification for retaining and protection of building foundation excavations”
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摘要: 《建筑基坑支护技术规程》（JGJ120—2012）[1]给出了锚杆刚度系数的计算公式,笔者认为该公式存在问题和缺陷：①锚固段越长,锚杆刚度系数反而越小;②锚杆刚度系数仅与锚杆材料参数、尺寸有关,而与土层性质毫无关联。该公式在推导过程中将剪应力沿锚固段的分布情况过于经验化和简化,未能真实反应锚杆荷载的传递原理。基于锚杆和土层协同变形原理,类似于文克尔弹性地基梁的处理方式,将锚杆周围土体等效为一系列独立作用的切向土弹簧,同反映地层法向特性的基床系数,引入了反映地层切向特性的剪切刚度系数,通过建立锚固段的受力平衡方程推导出新的锚杆刚度系数计算公式。与规程公式不同的是,该公式表明锚杆刚度系数随着锚固段的增长而增长,但是增长率是减少的,同时,还表明了锚杆刚度系数与土层剪切刚度系数密切相关。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.
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Keywords:
- soil anchor /
- rigidity coefficient /
- anchorage section /
- shear spring /
- cooperation deformation /
- shear stress
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