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均质土地基上埋深条形基础极限承载力系数数值研究

ISSN号：1000-6915
期刊名称：《岩石力学与工程学报》
时间：0
分类：TU43[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]江苏科技大学船舶与海洋工程学院,江苏镇江212003, [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071, [3]大连理工大学土木水利学院岩土工程研究所,辽宁大连116024, [4]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024, [5]青岛市胶州建设工程设计文件审查中心,山东青岛266300
相关基金：国家自然科学基金重点基金项目（50639010）;国家自然科学基金资助项目（50509023）.

关键词：土力学, 埋深条形基础, 均质地基, 极限承载力, 数值计算, soil mechanics, embedded strip footing, homogeneous foundation, limit bearing capacity, numericalanalysis

中文摘要：

以K-Terzaghi提出的叠加公式为基础计算均质地基上埋深条形基础的极限承载力，需要确定承载力系数及相应的埋深修正系数。一般情况是采用极限平衡法、滑移线法及上限分析法进行承载力问题的研究，但受假定破坏模式的影响，不同的研究成果具有较大差异，而有限元法并不事先假定破坏模式，其计算结果具有较高精度。通过在基础与地基土接触面及基础边缘土体内数值奇异点引入接触面单元，建立适用于埋深条形基础的理想弹塑性有限元数值计算模型。利用在ABAQUS平台上开发的计算模块，对饱和不排水黏土地基、砂土地基及土体摩擦角与黏聚力均不为0的地基承载力问题进行系统的有限元计算，分析各系数随基础侧面粗糙程度、地基土强度参数、超载大小等影响因素的变化规律，并与已有结果进行对比，所给出的承载力系数及相应埋深修正系数的计算图表，可供基础工程设计参考。

英文摘要：

In engineering practice, the limit bearing capacity of foundations is usually estimated using the superposed formulae suggested by K. Terzaghi. As it is used for strip footing embedded in homogeneous subsoil, the bearing capacity factors and the pertaining embedment modifying factors must be determined. Many published papers have used limit equilibrium method, slip-line method and upper bound method to investigate these factors. However, the predicted bearing capacity is affected by the assumed failure mode, which will lead to bigger discrepancies in the value of these factors obtained by different investigators. Conversely, the finite element method can predict more accurately bearing capacity without assuming failure mode in advance. An elastoplastic numerical model for embedded strip foundation is established by introducing zero-thickness interface element to remove the computational difficulty of the footing comer in finite element analysis and simulate the contact between subsoil and footing. A numerous numerical analysis for three types of subsoil, i.e. undrained clay, sand and the soil with nonzero cohesion and frictional angle, is executed to obtain the bearing capacity factors and embedment modifying factors. These factors are presented and compared with published results. Some rules of these factors varying with roughness of footing sides, embedment, surcharge load, soil strength are summarized and the applicability of these factors is also determined. These results can provide references to foundation design.

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