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Beam enhancement capability of a thin fibre reinforced polymer liner and its ability to support jointed roof strata
Géotechnique Letters ( IF 2.1 ) Pub Date : 2020-10-30 , DOI: 10.1680/jgele.19.00112 Z. Shan 1 , I. Porter 1 , J. Nemcik 1 , E. Baafi 1
Géotechnique Letters ( IF 2.1 ) Pub Date : 2020-10-30 , DOI: 10.1680/jgele.19.00112 Z. Shan 1 , I. Porter 1 , J. Nemcik 1 , E. Baafi 1
Affiliation
This study investigates a glass reinforced polymeric thin spray-on liner and its ability to reinforce substrate surface in underground excavations by the use of laboratory testings. Twenty-three hydrostone beams uncoated and coated with 5 mm thick fibre reinforced polymer coating were subjected to four point bending tests to study their strength. The hydrostone beams coated with fibre reinforced polymer experienced 1.3 times increase in strength when compared to the plain uncoated beams. Experiments also showed that in addition to the increased strength, the beams failure modes were also altered where the uncoated beams failed in tension while the polymer coated specimens failed predominantly in shear. To study the influence of the fibre reinforced polymer on fractured and notched surfaces, several beams with artificially induced rectangular and v-shaped notches were also tested. Results indicated that a single notch located at the bottom centre of the uncoated specimens led to strength reduce by 86% while polymer coated notched beams had 13-fold increase in strength compared to a notched but uncoated specimen. The specimen strength further increased when the notch was infilled with the polymer material. Substantial reinforcement of rock substrate in an underground tunnel is possible with application of this polymeric liner.
中文翻译:
薄纤维增强聚合物衬里的梁增强能力及其支撑节理屋顶层的能力
这项研究通过使用实验室测试来研究玻璃增强的聚合物薄喷涂衬里及其在地下挖掘中加固基底表面的能力。对未涂覆和涂覆5毫米厚的纤维增强聚合物涂层的二十三个水岩梁进行四点弯曲测试,以研究其强度。与普通的无涂层梁相比,涂有纤维增强聚合物的水岩梁的强度提高了1.3倍。实验还表明,除了增加强度外,梁的破坏模式也发生了变化,未涂覆的梁在拉伸时失效,而聚合物涂覆的试样主要在剪切时失效。为了研究纤维增强聚合物对断裂和缺口表面的影响,还测试了几条带有人为诱发的矩形和V形槽口的梁。结果表明,与未镀膜但未镀膜的试样相比,位于未镀膜试样底部中心的单个缺口导致强度降低了86%,而聚合物镀膜的缺口梁的强度提高了13倍。当缺口填充有聚合物材料时,样品强度进一步增加。通过使用这种聚合物衬里,可以在地下隧道中对岩石基质进行大量加固。当缺口填充有聚合物材料时,样品强度进一步提高。通过使用这种聚合物衬里,可以在地下隧道中对岩石基质进行大量加固。当缺口填充有聚合物材料时,样品强度进一步提高。通过使用这种聚合物衬里,可以在地下隧道中对岩石基质进行大量加固。
更新日期:2020-11-02
中文翻译:
薄纤维增强聚合物衬里的梁增强能力及其支撑节理屋顶层的能力
这项研究通过使用实验室测试来研究玻璃增强的聚合物薄喷涂衬里及其在地下挖掘中加固基底表面的能力。对未涂覆和涂覆5毫米厚的纤维增强聚合物涂层的二十三个水岩梁进行四点弯曲测试,以研究其强度。与普通的无涂层梁相比,涂有纤维增强聚合物的水岩梁的强度提高了1.3倍。实验还表明,除了增加强度外,梁的破坏模式也发生了变化,未涂覆的梁在拉伸时失效,而聚合物涂覆的试样主要在剪切时失效。为了研究纤维增强聚合物对断裂和缺口表面的影响,还测试了几条带有人为诱发的矩形和V形槽口的梁。结果表明,与未镀膜但未镀膜的试样相比,位于未镀膜试样底部中心的单个缺口导致强度降低了86%,而聚合物镀膜的缺口梁的强度提高了13倍。当缺口填充有聚合物材料时,样品强度进一步增加。通过使用这种聚合物衬里,可以在地下隧道中对岩石基质进行大量加固。当缺口填充有聚合物材料时,样品强度进一步提高。通过使用这种聚合物衬里,可以在地下隧道中对岩石基质进行大量加固。当缺口填充有聚合物材料时,样品强度进一步提高。通过使用这种聚合物衬里,可以在地下隧道中对岩石基质进行大量加固。