Behaviour of FRP-confined coal rejects based backfill material under compression
Behaviour of FRP-confined coal rejects based backfill material under compression
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FRP 约束煤矸石基充填材料在压缩下的行为
DOI：
10.1016/j.conbuildmat.2020.121171
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发表时间：
2020-11
影响因子：
7.4
通讯作者：
Alex Remennikov
中科院分区：
文献类型：
--
作者：
Hongchao Zhao;Ting Ren;Alex Remennikov
本文介绍了一种新型的纤维增强聚合物（FRP）支架，称为玻璃钢管状支架（FTSS）。FTSS的外部容器是小破裂应变（SRS）GFRP管，外部包裹具有大破裂应变（LRS）的超高分子量聚乙烯（UHMWPE）FRP护套，而填充物是煤矸石基回填材料（CBM）。煤层气是由工业副产品（即煤矸石）和高流动性水泥灌浆材料制成的，当其用于地下矿山时，会产生一些环境和经济效益。试验变量包括煤的类型（即筛分和未筛分）、SRS FRP管的厚度（即1.5 mm和3.0 mm）以及LRS FRP护套的厚度（即2层、3层和4层）。试验结果表明，由于外部玻璃钢容器的约束作用，外承式钢管混凝土柱的承载力和变形能力得到了显著提高。现有的FRP约束普通混凝土应力-应变模型可以合理地预测具有大变形能力的FTSS中约束煤层气的受压性能。柔性FTSS适用于地下空间和基础设施，其中结构的完整性是主要关注的问题。
This paper introduces a novel standing support incorporating fibre-reinforced polymer (FRP), termed FRP tubular standing support (FTSS). The exterior container of FTSS is the small rupture strain (SRS) GFRP tube wrapped with ultra-high molecular weight polyethylene (UHMWPE) FRP jacket with large rupture strain (LRS), while the infill is the coal rejects based backfill material (CBM). The CBM is made of industrial by-product (i.e. coal rejects) and high flowable cementitious grout material, leading to some environmental and economic benefits when it is used in underground mines. Test variables included the type of coal rejects (i.e. screened and unscreened), the thickness of SRS FRP tube (i.e. 1.5 mm and 3.0 mm) as well as the thickness of LRS FRP jacket (i.e. 2-ply, 3-ply and 4-ply). Test results showed that both the load carrying capacity and deformation ability of CBM in FTSS have been significantly enhanced attributed to the confinement provided by exterior FRP container. Existing stress–strain model for FRP-confined normal concrete can be used to reasonably predict the compressive behaviour of confined CBM in FTSS with large deformation ability. The ductile FTSS is suitable for underground spaces and infrastructures where the integrity of structure is the main concern.
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