基于不同屈服准则均布条形荷载下塑性区的确定

›› 2006, Vol. 27 ›› Issue (S2): 259-263.

基于不同屈服准则均布条形荷载下塑性区的确定

李顺群¹, 王英红³, 王学志²

1.天津城市建设学院土木工程系，天津 300384；2.辽宁工学院土木建筑系, 锦州 121001; 3.辽宁工学院信息科学与工程学院，锦州 121001

收稿日期:2006-07-15 发布日期:2006-12-16
作者简介:李顺群, 男, 1971年生, 博士, 副教授, 主要从事土力学基本理论与非饱和土力学等方面的研究
基金资助:
辽宁省教育厅科学研究计划资助（No.2004F105）。

Determination of the plastic zone under band-distributed-load based on diverse yield criteria

LI Shun-qun¹, WANG Ying-hong³, WANG Xue-zhi²

1. Tianjin Institute of Urban Construction, Department of Civil Engineering, Tianjin 300384, China; 2. Department of Civil Engineering, Liaoning Institute of Technology, Jinzhou 121001, China ; 3. School of Information Science & Engineering, Liaoning Institute of Technology, Jinzhou 121001, China

Received:2006-07-15 Published:2006-12-16

摘要/Abstract

摘要： 为了合理确定条形荷载下临塑荷载和塑性区的范围，在考虑侧压力系数不等于1的情况下，提出了两类方法。一类仍旧采用Mohr-Coulomb准则，但假设侧压力系数随倾角线性变化；另一类在假设侧压力系数随倾角线性变化的基础上采用3种不同的广义Mises准则。算例分析结果表明：第1类方法虽然合理减小了正应力，但仍没有考虑中主应力，结果导致得出的塑性区大于原Mohr-Coulomb准则法得出的结果；第2类方法得出的3种塑性区形状相似，其中基于外角外接Mohr-Coulomb等边不等角六锥体的广义Mises准则得出的临塑荷载与传统方法结果相似，但塑性区要小一些。因此，这种方法可以用来更合理地估算条形荷载下的塑性区和承载力。

关键词: 地基承载力, Mohr-Coulomb准则, 广义Mises准则, 侧压力系数

Abstract: The method employed to determine the plastic critical load and plastic zone is based on Mohr-Coulomb criterion and a hypothesis that the coefficient of the lateral earth pressure is unit along inclination. It is found that the settlement obtained by this method is larger than the actual situation. Considering change of coefficient of lateral earth pressure along inclination, two methods are constructed to determine the plastic critical load and plastic zone. One is based on Mohr-Coulomb criterion and the other is based on three generalized Mises criterions. The computational results show that even the normal stresses are reasonably cut down the plastic zone from the first proposed method is larger than that from the present employed method for ignoring the intermediate principle stress. The shapes of the plastic zone obtain from three different criterions adopted in proposed method are similar. The plastic critical load, gain from the generalized Mises criterion whose circle is circumscribe to the exterior angle of Mohr-Coulomb’s scalene hexagon, is almost equal to that got by the present employed method, but the corresponding plastic zone is smaller.

Key words: bearing capacity, Mohr-Coulomb criterion, generalized Mises criterion, coefficient of lateral earth pressure

中图分类号:

TU 470

李顺群 , 王英红 , 王学志,. 基于不同屈服准则均布条形荷载下塑性区的确定[J]. , 2006, 27(S2): 259-263.

LI Shun-qun , WANG Ying-hong , WANG Xue-zhi,. Determination of the plastic zone under band-distributed-load based on diverse yield criteria [J]. , 2006, 27(S2): 259-263.

参考文献

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