基于透明土技术的加筋地基模型试验

发布时间：2018-01-19 09:50

本文关键词： 加筋地基透明土承载力位移场破坏模式　出处：《同济大学学报(自然科学版)》2017年03期 　论文类型：期刊论文

【摘要】：采用透明土技术,开展了5组不同筋材长度和加筋深度(层数)的加筋地基平面应变模型试验,以及1组无筋地基对比试验,以研究在条形基础荷载下加筋地基内部位移场演化及滑移破坏过程,并探讨其荷载—沉降特性.结果表明,加筋地基中的土体在基础沉降过程中,首先在加筋区的两侧底部非加筋区位置累积水平位移,并自下而上向加筋层扩展,致使筋材自下而上依次断裂,最终形成宏观剪切破坏面;加筋地基在基础沉降过程中形成两个应力扩散区,分别沿筋材弯折段和基础边缘向下扩展,前者扩散角是后者的2.5倍左右;加筋地基和无筋地基均表现为普朗特尔滑动破坏模式,加筋地基滑动面深度和宽度基本随加筋深度和加筋长度的增大而增大;当筋材强度不足时,加长筋材长度对加筋地基承载力的提高不起作用,而增大加筋层数对承载力影响显著.
[Abstract]:The use of transparent soil technology, carried out 5 groups of different reinforcement length and reinforcement depth (layers) of the plane strain of reinforced foundation model test, and the 1 group foundation reinforced contrast test, in order to study in strip foundation under the load of reinforced foundation internal displacement field evolution and slip failure process, and to investigate the load settlement characteristics. The results show that the reinforcement in the foundation soil in foundation settlement process, first on both sides of a bottom reinforced the position of reinforced area cumulative horizontal displacement, and bottom-up expansion to the reinforced layer, the reinforcement material from bottom to top fracture, and ultimately the formation of surface damage of macroscopic shear; two stress diffusion region is formed in the in the process of the foundation settlement of reinforced foundation, respectively along the reinforcement bending section and a base edge extending down, the diffusion angle is about 2.5 times of the latter; reinforced foundation and reinforced foundation were Prandle sliding failure mode of reinforced foundation The depth and width of the sliding surface basically increase with the increase of the reinforcement depth and reinforcement length. When the strength of the reinforcement is insufficient, the length of the lengthened steel bar does not play a role in improving the bearing capacity of the reinforced foundation, while increasing the number of reinforcement layers has a significant effect on the bearing capacity.

【作者单位】：同济大学土木工程学院;地质灾害防治与地质环境保护国家重点实验室;中交第一公路勘察设计研究院有限公司;
【基金】：国家重点实验室开放基金(SKLGP2015K005) 上海市浦江人才计划(14PJD032)
【分类号】：TU41
【正文快照】： 3.中交第一公路勘察设计研究院有限公司,陕西西安710075)加筋地基是地基处理的一种方法,它是指将基础下一定范围内的软弱土层置换为加筋垫层以作为持力层的地基.这种地基处理技术造价低、施工简便且取材广泛,在公路、铁路和建筑等领域中得到了广泛应用[1-2].目前对加筋地基的

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