
第34卷第1期 2017年1月
土木工程与管理学报 Journal of Civil Engineering and Management
Vol.34 No. 1 Jan.2017
互层地基附加应力计算深度及影响因素
陈亮,余飞?
(1.湖北工业大学体育学院,湖北武汉430068: 2.中国科学院武汉岩土力学研究所,湖北武汉430071)
摘要:对于成层地基,附加应力影响深度是地基变形计算首先需要解决的问题。针对成层地基结构特点,探讨地基中附加应力计算深度的影响因素和变化规律,综合研究土层结构、土层厚度和基础宽度等对计算深度的影响。结果表明,双层地基中,软土层厚度对计算深度有较大影响,基础宽度增加会使计算深度增加,但计算深度与基础宽度的比值却减小;含软土夹层的多层地基中,上覆硬土层对计算深度影响较小,计算深度与软土夹层厚度成负相关关系,随基础宽度增加,计算深度增加,计算深度与基础宽度的比值在一定范围内呈现减小趋
势;另外,建议在成层结构明显的地基中,使用变形比法计算地基的附加应力计算深度。关键词:成层地基;附加应力;压缩深度;影响规律;计算深度
中图分类号:TU431
文献标识码:A文章编号:2095-0985(2017)01-0067-05
Calculating Depth of Additional Stress and its InfluencingFactors
in Multi-layered Foundation
CHENLiang',YUFei
(1. School of Physical Education, Hubei University of Technology, Wuhan 430068, China; 2.Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China) Abstract: For layered foundation, the calculating depth of additional stress must first be established in deformation computing. The integrated impact of soil structure, soil thickness and basis width on the calculating depth have been researched. It indicates that in two-layer foundation, the soft soil has a greater impact on the depth and the calculating depth will increase with the basis width increases, but Sb which is the ratio of depth and basis width will reduce. Also, in multi-layered foundation, depth and soft thickness with a negative correlation; with the base width increases, the calculating depth increases, Sb presents a decreasing trend in a range. And addition, the deformation ratid method is proposed to determine the calculating depth of additional stress in multi-layered foundation. Key words : multi-layered foundation; additional stress ; squeezed depth; influence laws ; calculating
depth
对于地质条件复杂,互层沉积(韵律结构)特征显著的建筑区域,地基承载力和变形是关乎工程建设的重要问题。目前,针对成层地基的承载力问题,不少学者在均质地基承载力计算公式的基础上提出了许多修正的地基承载力公式[2-4],主要是扩散角法、冲剪破坏法和强度加权平均法等15。成层地基压缩层深度,即在荷载作用下附加应力计算深度的确定,在成层地基沉降
收稿日期:2016-04-22修回日期:2016-05-12
变形计算中占有重要地位,关乎工程的地质勘查地基处理和沉降变形控制等。
对于成层地基附加应力计算深度的确定,何颐华等提出了一种计算方法,可以用来解决地质分层复杂且其上基础宽度为10~30m、埋深5 m左右的地基计算深度,并列出了根据试验得到的计算深度调整系数表;夏正中[采用粘弹塑性模型,结合地基土连结强度理论,给出了地基土有
作者简布:静数掘1977-),男,湖北孝感人,讲师,硕土,研究方向为工程勘察(Email:17355060@qq.com)