剑麻纤维加筋膨胀土抗剪特性及机理  

Shear Behavior and Mechanism of Sisal Fiber Reinforced Expansive Soil

作　　者：李耕春 郝建斌[1] 张焕 黄佳欣 蒋臻蔚[1] LI Gengchun;HAO Jianbin;ZHANG Huan;HUANG Jiaxin;JIANG Zhenwei(School of Geology Engineering and Geomatics,Chang'an University,Xi'an 710061,China)

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710061

出　　处：《甘肃科学学报》2023年第2期78-82,93,共6页Journal of Gansu Sciences

基　　金：国家自然科学基金(41472266,42077260);中央高校基金(300102262204)。

摘　　要：为研究干湿循环作用下纤维加筋土的抗剪性能,开展了加筋土和素土的干湿循环试验和直剪试验,采用数字图像处理技术提取了试样表面裂隙面积,分析干湿循环次数、裂隙面积对抗剪强度的影响。结果表明:(1)随着干湿循环次数的增加,试样的抗剪强度呈逐渐降低的趋势,干湿循环次数相同时,加筋土的抗剪强度大于素土;(2)剑麻纤维可以显著提升土体的粘聚力,对内摩擦角的提升较小;(3)随着试样裂隙面积的增大,抗剪强度逐渐降低,试样的裂隙面积与抗剪强度近似呈直线关系,裂隙面积相同时,加筋土的抗剪强度更高。In order to analyze the shear properties of fiber reinforced soil under dry-wet cycle,the test of reinforced soil and plain soil were carried out,and the crack area on the surface of the sample was extracted by digital image processing technology,and the effects of the number of dry-wet cycles and crack area on the shear properties were analyzed.The results show that(1)with the increase of the wet-dry cycles times,the shear strength of the samples decreases gradually.The shear strength of reinforced soil is greater than that of plain soil with the same times of wetting and drying cycles.(2)Sisal fiber can significantly improve the cohesion of soil,but less impact on the increase of internal friction Angle.(3)The shear strength of the reinforced soil decreases gradually with the increase of the crack area of the sample.The relationship between the crack area and the shear strength of the sample is approximately linear,and the shear strength of the reinforced soil is higher when the crack area is the same.

关 键 词：加筋膨胀土 剑麻纤维 干湿循环 抗剪强度 裂隙 

分 类 号：TU443[建筑科学—岩土工程]