《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“钢筋加固挡土墙中的竖向护面荷载”

作者：I. P. Damians; R. J. Bathurst; A. Josa; A. Lloret and P. J. R. Albuquerque

刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2013年9月，139卷第9期，1419–1432页

关键词：挡土墙；钢筋加固；竖向荷载；面板；承压垫板；有限元模型

摘要：本文研究了回填土、地基土和水平节理的竖向压缩性对施工末期钢筋掺土混凝土面板挡土墙中竖向荷载发展量级的影响。回顾了装有测量仪器的原位挡土墙中的趾部荷载，其中竖向趾部荷载要远远大于护面的自重。在一些极限情况下，这些荷载会造成面板与面板之间的接触，导致挡土墙前面混凝土的剥落。由于回填土与面板之间的相对运动，使得竖向荷载超过面板自重，这可能会使得面板和钢筋单元连接处的面板-土界面间剪切和下拉荷载发展变大。随后建立了一个二维的有限元模型系统地研究了回填土、地基土、承载垫板刚度和面板-土间相互作用对面板中竖向荷载的影响。结果表明，适当的选择压缩承载垫板的数量和类型能够有效地降低结构中的竖向压缩荷载，与此同时还可以确保混凝土面板之间的竖向缝隙在容许的范围内。参数分析严格的限定为一个高16.7m，埋深1.5m的挡土墙，与一个记录完好的现场情况匹配。然而，本文给出的观测结果也适用于其他类似的结构。工程师可采用这种通用的数值方法对现有的集成了简单本构模型的商业有限元模型包的类似钢筋挡土墙结构承载垫板进行优化。

Vertical-Facing Loads in Steel-Reinforced Soil Walls

Authors: I. P. Damians; R. J. Bathurst; A. Josa; A. Lloret and P. J. R. Albuquerque

Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 139, Issue 9(September 2013), 1419–1432

Key words: Soil retaining walls, Steel reinforcement, Vertical loads, facing panels, bearing pads, Finite-element modeling

Abstract: The paper investigates the influence of backfill soil, foundation soil, and horizontal joint vertical compressibility on the magnitude of vertical loads developed in steel-reinforced soil concrete panel retaining walls at the end of construction. Measurements of toe loads recorded from instrumented field walls are reviewed and demonstrate that vertical toe loads can be much larger than the self-weight of the facing. In extreme cases, these loads can result in panel-to-panel contact leading to concrete spalling at the front of the wall. Vertical loads in excess of panel self-weight have been ascribed to relative movement between the backfill soil and the panels that can develop panel-soil interface shear and down drag loads at the connections between the panels and the steel-reinforcement elements. A two-dimensional finite-element model is developed to systematically investigate the influence of backfill soil, foundation soil, bearing pad stiffness, and panel-soil interaction on vertical loads in the panel facing. The results show that an appropriately selected number and type of compressible bearing pads can be effective in reducing vertical compression loads in these structures and at the same time ensure an acceptable vertical gap between concrete panels. The parametric analyses have been restricted to a single wall height (16.7 m) and embedment depth of 1.5 m, matching a well-documented field case. However, the observations reported in the paper are applicable to other similar structures. The general numerical approach can be used by engineers to optimize the design of the bearing pads for similar steel-reinforced soil wall structures using available commercial finite-element model packages together with simple constitutive models.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000874