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各向异性软黏土地基上浅基础破坏包络面研究

ISSN号：1000-6915
期刊名称：岩石力学与工程学报
时间：0
页码：2362-2369
语言：中文
分类：TU471.8[建筑科学—结构工程;建筑科学—土工工程]
作者机构：[1]鲁东大学岩土工程重点实验室,山东烟台264025, [2]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
相关基金：国家自然科学基金资助项目（50909048 50639010）; 鲁东大学博士科研启动基金项目（LY20075602）
相关项目：海洋土的工程特性及其地基的变形机理研究

关键词：土力学, 软土地基, 承载力, 浅基础, 复合加载, 各向异性, 有限元分析, soil mechanics, soft soil foundation, bearing capacity, shallow foundation, combined loading, anisotropy, finite element analysis

中文摘要：

根据已有的关于土体强度各向异性的表达式,针对基于Tresca屈服准则的理想弹塑性模型进行改进,使之可以考虑不排水条件下软黏土强度的各向异性,并在大型通用有限元软件ABAQUS中予以数值实施。联合应用swipe加载模式和固定位移比加载模式,对于条形浅埋基础在竖向荷载V、水平荷载H与力矩荷载M的复合加载条件下的承载性能进行比较系统的数值模拟,主要探讨地基土不排水强度的各向异性、竖向荷载水平对于浅基础在H-M荷载空间内的破坏包络面的影响。首先进行浅基础分别在竖向、水平与力矩荷载单独作用下极限承载力的计算,并与已有结果进行对比。进而对于不同竖向荷载水平下浅基础在H-M荷载空间内的破坏包络面特性进行分析。计算结果表明：当浅基础埋深与宽度之比较大或基础承受三维自由度加载时,swipe加载模式得到的加载路径比真实的破坏包络面明显偏小;对于给定埋深的浅基础,其包络面的大小与地基土强度的各向异性与竖向荷载水平都有关系,而在归一化荷载平面内,包络面形状主要受到竖向荷载水平的影响,而与地基土强度的各向异性无关。

英文摘要：

According to the available expressions about anisotropy of soil strength,the simple elasto-perfectly plastic Tresca model is modified to allow for the strength anisotropy of soft soil under undrained condition based on the general purpose finite element software ABAQUS.Combining swipe loading method with fixed displacement ratio loading method,the bearing capacity of shallow strip foundations under combined loading is simulated through finite element numerical studies.The effect of soil strength anisotropy and vertical load level on the failure envelope of shallow strip foundations is studied.The undrained bearing capacity of shallow strip foundations under uniaxial vertical（V）,moment（M） and horizontal（H） loads is predicted and compared with available solutions.Then the VMH capacity of shallow foundations under combined loading is reported in the form of slices through the three-dimensional VMH failure envelope as planes in H-M at various levels of vertical loads.The results show that the swipe path can considerably undercut the true failure envelope for shallow foundation with the ratio of buried depth to width larger than 0.5 or subjected to three degrees of freedom combined loading.For shallow foundation with given buried ratio,the size of the failure envelope is both dependent on soil strength anisotropy and the level of vertical load,however the shape of failure envelope is only dependent on the level of vertical load but almost independent on soil strength anisotropy.

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