Analysis of circular concrete-filled steel tube (CFT) support in high ground stress conditions
Analysis of circular concrete-filled steel tube (CFT) support in high ground stress conditions
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高地应力条件下圆形钢管混凝土（CFT）支护分析
DOI：
10.1016/j.tust.2014.04.002
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发表时间：
2014-07-01
影响因子：
6.9
通讯作者：
Tang, Chunan
中科院分区：
文献类型：
--
作者：
Chang, Xu;Luo, Xulin;Tang, Chunan
钢管混凝土支架是一种新型的被动支护形式，用于控制地下结构围岩的稳定性，特别是在地应力较高的情况下。本文对钢管混凝土支座的受力性能进行了数值研究。混凝土采用塑性损伤模型，混凝土与钢管之间采用两种界面模型描述。通过计算结果与试验观测结果的对比，验证了数值方法的可行性和准确性。钢管混凝土支座的界面行为对其力学性能有重要影响，建议摩擦系数取0.4。结果表明，钢管混凝土支座的荷载-位移响应一般可分为弹性、弹塑性和塑性三个阶段，钢管混凝土支座具有稳定的变形能力，不会突然丧失承载能力。钢管混凝土支座的力学性能随着混凝土强度和含钢率的增加而提高，但承载能力随着支座半径的增大而降低。(C)2014爱思唯尔有限公司。保留所有权利。
Concrete-filled steel tubular (CFT) support has been proposed as a new passive support form for controlling the stability of surrounding rock in underground structures, especially for the case of high ground stress. This paper presents a numerical study on the mechanical performance of CFT support. A plastic damage model is used for the concrete and two interface models are adopted to describe the behaviors between the concrete and the steel tube. The feasibility and accuracy of the numerical method are verified by comparing the calculated results with the test observations. The interface behaviors of CFT support has an important influence on its mechanical performance and the friction coefficient of 0.4 is proposed. The results indicate that the load-displacement response of the CFT support could be generally divided into three stages, elastic, elastic-plastic and plastic stages and the CFT support exhibits a stable deformability and never loses its load capacity in a sudden manner. The mechanical performance of the CFT support increases by increasing the concrete strength and the steel ratio; however, the load capacity decreases as the support radius increases. (C) 2014 Elsevier Ltd. All rights reserved.