| 梅岭,梅国雄,易宗发.K0≠1时的地基临塑载荷和临界载荷近似计算公式[J].计算力学学报,2010,27(6):1090~1095 |
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| K0≠1时的地基临塑载荷和临界载荷近似计算公式 |
| Approximate formulas of critical edge pressure and critical load of subsoil with K0≠1 |
| 投稿时间：2008-11-04 修订日期：2009-11-09 |
| DOI：10.7511/jslx20106023 |
| 中文关键词: 静止土压力系数 临塑载荷 临界载荷 近似公式 |
| 英文关键词:coefficient of earth pressure at rest critical edge pressure critical load approximate formula |
| 基金项目:国家自然科学基金项目(50608038)资助项目. |
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| 摘要点击次数: 1738 |
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| 中文摘要: |
| 地基弹塑性承载力pcr、p1/4的公式在推导过程中,为方便求解,一般假设地基土体的静止土压力系数K0=1,即把自重应力场看成是静水应力。这一假定实际上人为地增加了地基土的侧向压力,使土体处于加密状态,从而过高地估计了地基承载力。考虑K0≠1的前提下,由地基土中一点的应力状态,根据莫尔-库伦破坏准则,得到该点的临塑、临界荷载的近似公式。该公式修正了一些学者在K0≠1时推导地基弹塑性承载力公式过程中的缺陷,也弥补了现有公式的局限性,得到了土体抗剪强度参数c、φ在不同的K0下对地基临界载荷p1/4的影响,给出了该近似公式的适用条件。 |
| 英文摘要: |
| When it proposes calculation formulas of critical edge pressure pcr of subsoil and critical load p1/4, coefficient of earth pressure at rest K0 equals to 1. It means that the field of geostatic stress equal to hydrostatic state stress. This supposal increases the lateral load of subsoil, and makes the subsoil be in intensive state, that results in a higher bearing capacity of subsoil. Determining the stress state of one point in subsoil, then proposing approximate formulas of subsoil critical edge pressure and critical load when K0≠1 based on Mohr-Coulomb criterion. This method corrects some calculating mistakes when it proposes calculation formulas of subsoil bearing capacity which obtains K0≠1 by some scholars. And it compensates the limitation of some other calculation formulas. The influence of shear strength indexes on critical load of subsoil is found. Conditions which are applicable to the approximate formula are given. |
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