| 喻永祥,闵望,宋京雷,郝社锋,蒋波,刘瑾,卜凡.剑麻纤维复合黏性土裂隙发育特征及其机理研究[J].矿产勘查,2021,12(6):1448-1454 |
| 剑麻纤维复合黏性土裂隙发育特征及其机理研究 |
| Study on fracture development characteristics and mechanism of sisal fiber composite clay |
| 投稿时间：2020-11-06 |
| DOI： |
| 中文关键词: 土体开裂 剑麻纤维 干湿循环 裂隙发育特征 桥接作用 |
| 英文关键词: soil cracking sisal fiber dry-wet cycle crack development characteristics bridging |
| 基金项目:本文受江苏省自然资源科技项目(KJXM2019028)、自然资源部国土(耕地)生态监测与修复工程技术创新中心开放课题(2020) |
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| 中文摘要: |
| 土体开裂一直是地质工程领域内的一个研究热点。近年来由于受到极端天气的影响，在干燥的气候条件下，水分的蒸发将导致黏性土表面及内部产生干燥，进而收缩、开裂，发育成纵横交错的裂隙，使地面及其上建筑物产生破坏。本文针对黏性土干缩开裂的问题，通过添加剑麻纤维制备得到纤维复合黏性土， 并开展一系列干湿循环试验。试验以添加不同剑麻纤维含量(Cf = 0、0.1%、0.3%、0.6%)作为变量，共制备4 组试样，且每组均含3 份对照试样。将试样置于20℃的恒温养护箱中进行干燥，实时记录其裂隙发育过程，并结合数字图像处理技术(PCAS)，对土体表层裂隙网络的几何形态进行了定量分析，以探究纤维对黏性土裂隙发育的影响。试验结果表明:(1)随着黏性土中所添加剑麻纤维含量的不断增加，其表面产生裂隙的长度、宽度及被裂隙所分割的土体区块面积均不断地减小。(2)通过对黏性土进行干湿循环试验可知，试样中剑麻纤维含量越高，每一次干湿循环后其表面裂隙“愈合”效果越好，同时整体稳定性得到一定程度的提升。 |
| 英文摘要: |
| Soil cracking has always been a research hotspot in the field of geological engineering. In recent years, due to the influence of extreme weather, the evaporation of water will lead to the drying of the clay soil, and then shrinkage, cracking, development into crisscross cracks, so that the ground and buildings on the destruction. Aiming at the problem of dry shrinkage and cracking of cohesive soil, fiber composite cohesive soil is prepared by adding sisal fiber, and a series of dry-wet cycle tests are carried out. In the tests, adding different sisal fiber content (Cf = 0, 0.1%, 0.3%, 0.6%) as a variable, a total of 4 groups of samples are prepared, each group contained 3 control samples and dried under a constant temperature of 20 ℃. The changes of surface cracking are kept in a real-time record during the whole process of drying. The image processing technique is employed for quantitative analysis of crack network to research the influence of fiber on the development of fissures. The results show that: (1) With the increase of the content of sisal fiber in the clay soil, the length and width of the cracks on the clay soil surface and the area of the divided soil decrease continuously; (2) The dry-wet cycle test on the clay soil shows that the higher fiber content in the sample, the better the “healing” effect of the surface cracks, and the overall stability of sample is improved to a certain extent. |
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