深基坑空间效应机理及考虑其影响的土应力研究

发布时间：2018-04-01 02:37

本文选题：深基坑　切入点：空间效应　出处：《浙江大学学报(工学版)》2014年09期

【摘要】：以坑周土体为研究对象,根据土体中土拱效应及滑裂面的相对位置关系分析深基坑工程空间效应的形成机理;根据受空间效应影响土体微元和不受空间效应影响土体微元的应力状态,推导考虑空间效应的支护结构土正应力计算公式.研究表明:空间效应的本质为坑周土体中的拱效应对支护土正应力和变形等特性的影响,研究空间效应时采用基坑长深比更合理;考虑空间效应的土正应力计算公式可以精确地计算支护结构上某点处的土正应力值,是关于该点深度和至坑角距离的二元函数,弥补了基坑设计规范中土正应力计算公式只与深度相关的缺陷.算例表明,该公式可以反映支护结构上土正应力的整体分布情况.
[Abstract]:Taking the soil around the pit as the research object, the formation mechanism of the spatial effect of deep foundation pit engineering is analyzed according to the soil arch effect and the relative position of sliding surface. According to the stress state of soil element affected by spatial effect and not affected by spatial effect, The formula for calculating the normal stress of supporting structure soil considering space effect is derived. It is shown that the essence of spatial effect is the effect of arch effect in the soil around the pit on the normal stress and deformation of the supporting soil. When studying the spatial effect, it is more reasonable to use the foundation pit length than the depth, and the calculation formula of soil normal stress considering the spatial effect can accurately calculate the soil normal stress value at a certain point on the supporting structure, which is a binary function about the depth of the point and the distance from the angle to the pit. It makes up for the defect that the calculation formula of soil normal stress in foundation pit design code is only related to depth. The calculation example shows that the formula can reflect the overall distribution of soil normal stress on supporting structure.
【作者单位】：解放军理工大学国防工程学院爆炸冲击防灾减灾国家重点实验室;空军第五空防工程处;
【基金】：国家自然科学基金创新研究群体科学基金资助项目(51021001)
【分类号】：TU43;TU473.2

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