国外文献 > 1.轴承 > 1. 基础理论与机制 > 承载与性能
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| 标 题： |
A homogenization method for estimating the bearing capacity of soils reinforced by columns
一种用于估算由柱子加固的土壤承载力的均质化方法 |
| 作 者： |
B. Jellali
M. Bouassida
P. de Buhan |
| 关键词： |
Bearing capacity [承载能力]
Columns [ 专栏]
Cohesion ratio [ 凝聚力比率]
Homogenization theory [ 均质化理论]
Macroscopic strength criterion [ 宏观强度准则]
Reinforced soil [ 加固土]
Substitution factor [ 替代系数]
Upper bound [ 上限]
Yield design theory [ “产量设计理论”] |
| 出版年： |
2005 |
| 期刊名： |
International Journal for Numerical and Analytical Methods in Geomechanics
《数值与解析地力学国际期刊》 |
| 年卷期： |
2005, vol.29, no.10 |
| 摘 要： |
The ultimate bearing capacity problem of a strip foundation resting on a soil reinforced by a group of regularly spaced columns is investigated in the situation when both the native soil and reinforcing material are purely cohesive. Making use of the yield design homogenization approach, it is shown that such a problem may be dealt with as a plane strain yield design problem, provided that the reinforced soil macroscopic strength condition has been previously determined. Lower and upper bound estimates for such a macroscopic criterion are obtained, thus giving evidence of the reinforced soil strong anisotropy. Performing the upper bound kinematic approach on the homogenized bearing capacity problem, by using the classical Prandtl's failure mechanism, makes it then possible to derive analytical upper bound estimates for the reinforced foundation bearing capacity, as a function of the reinforced soil parameters (volume fraction and cohesion ratio), as well as of the relative extension of the reinforced area. It is shown in particular that such an estimate is closer to the exact value of the ultimate bearing capacity, than that derived from a direct analysis which implicitly assumes that the reinforced soil is an isotropic material.
研究了当天然土壤和加固材料均为纯黏性材料时，一组等距布置的柱子加固的条形基础的最终承载力问题。利用屈服设计同质化方法，表明只要先前确定了加固土壤的宏观强度条件，此类问题就可以作为平面应变屈服设计问题来处理。获得了这种宏观准则的下限和上限估计值，从而证明了加固土壤的强各向异性。对同质化承载力问题采用上限运动方法，并利用经典的普朗特破坏机制进行计算，从而能够得出加固基础承载力的解析上限估计值，该估计值是基于加固土壤参数（体积分数和黏聚力比）以及加固区域的相对扩展量而变化的。特别指出的是，这种估算值与最终承载力的精确值相比更为接近，而这种估算并非基于直接分析得出，后者隐含地假定加固后的土壤是一种各向同性的材料。 |
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