| 有机聚合物复合纤维改良砂土无侧限抗压强度研究 |
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| 引用本文： | 朱旭芬,黄庭伟,刘瑾,车文越,戴承江,宋泽卓,王梓.有机聚合物复合纤维改良砂土无侧限抗压强度研究[J].河海大学学报(自然科学版),2023,51(6):90-98, 116. |
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| 作者姓名： | 朱旭芬 黄庭伟 刘瑾 车文越 戴承江 宋泽卓 王梓 |
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| 作者单位： | 河海大学地球科学与工程学院 |
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| 基金项目： | 国家自然科学基金项目(41877212)； |
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| 摘 要： | 为研究有机聚合物复合纤维改良砂土的抗压特性、变形规律与改良机理，通过无侧限抗压强度试验和数值模拟分析了改良砂土抗压变形过程的力链变化与微裂纹发育规律，给出了改良砂土的破坏与改良机理。结果表明：有机聚合物复合纤维能够有效提升砂土的抗压强度，随着有机聚合物含量的增大，改良砂土的无侧限抗压强度逐渐提高；随着有机聚合物含量与应变增大，改良砂土的力链演化与微裂纹发育明显改变，力链由环状和柱状结构转变为拱状结构，微裂纹总数量及张拉微裂纹增多，破坏由单一路径向多路径转变。有机聚合物复合纤维黏结、包裹砂粒以及三者相互耦合胶结有效提升了砂土的抗压特性；当荷载过大时，有机聚合物膜发生破裂，纤维逐渐断裂与滑脱，改良砂土网状结构逐渐失稳，砂粒被迫发生位移与旋转，形成局部微裂纹，最终发育、延伸形成裂隙造成破坏。
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| 关 键 词： | 改良砂土 有机聚合物复合纤维 无侧限抗压强度 土体加固 |
| 收稿时间： | 2023/5/26 0:00:00 |
Study on unconfined compressive strength of sand improved by organic polymer composite fiber |
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| ZHU Xufen,HUANG Tingwei,LIU Jin,CHE Wenyue,DAI Chengjiang,SONG Zezhuo,WANG Zi.Study on unconfined compressive strength of sand improved by organic polymer composite fiber[J].Journal of Hohai University (Natural Sciences ),2023,51(6):90-98, 116. |
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| Authors: | ZHU Xufen HUANG Tingwei LIU Jin CHE Wenyue DAI Chengjiang SONG Zezhuo WANG Zi |
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| Affiliation: | School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China |
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| Abstract: | In order to study the compressive properties, deformation rules and improvement mechanism of sand improved by the organic polymer composite fiber, through the unconfined compressive strength test and the numerical simulation, the laws of force chain change and microcrack development in the compressive deformation process of improved sand were analyzed, from which the destruction and improvement mechanism of improved sand were summarized. The results show that the organic polymer composite fiber can effectively improve the compressive strength of sand. With the increase of organic polymer content, the unconfined compressive strength of improved sand increases. In addition, with the increase of organic polymer content and strain, the force chain evolution and microcrack development of the improved sand change obviously. The force chain changes from a ring-column structure to an arch structure, and the total number of microcracks and tensile microcracks also increases, indicating that failure changes from single path to multiple paths. The improvement mechanism shows that the organic polymer composite fiber can effectively improve the compressive properties of sand by binding and wrapping the sand grains. When the load is too large, the organic polymer film breaks, the fibers break and slip gradually, and the network structure becomes unstable gradually. In such a condition, the sand is forced to displace and rotate, forming local micro-cracks that eventually develop and extend to form cracks resulting in damages. |
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| Keywords: | improved sand organic polymer composite fiber unconfined compressive strength soil reinforcement |
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