玻璃纤维改良对浙西山区红黏土力学性能的影响  

Mechanical Properties of Glass-Fiber Improved Red Clay inthe Mountainous Area of Western Zhejiang

作　　者：葛宏盛 刘丽萍[1] GE Hongsheng;LIU Liping(Civil&Architecture Engineering,Xi'an Technological University,Xi’an 710021,China;Zhejiang Cheng-ming Experimental Testing Co.Ltd.,Quzhou 324300,China)

机构地区：[1]西安工业大学建筑工程学院,西安710021 [2]浙江成明试验检测有限公司,衢州324300

出　　处：《西安工业大学学报》2024年第1期41-47,共7页Journal of Xi’an Technological University

基　　金：陕西省自然科学基础研究计划项目(2013JM7004)。

摘　　要：为了解决高液限红黏土在浙西地区工程施工中引起的路基不均匀沉降、滑坡等工程地质灾害。文中采用玻璃纤维加筋技术改良红黏土,通过直剪试验、无侧限抗压试验对不同长度、掺量的玻璃纤维红黏土力学性能进行研究,分析其力学性能指标演变规律。试验结果表明,在红黏土中掺入定量的玻璃纤维对土体的抗剪强度有明显的提升作用,可使土体的黏聚力相比于素土提高1.68~2.22倍,黏聚力随着掺量和长度的增加先增大后减小。玻璃纤维红黏土的无侧限抗压强度相比于素土提高了1.47~1.95倍,纤维土的无侧限抗压强度随掺量、长度的增加而增强。通过分析应力—应变关系曲线发现素土应力峰值出现在2.5%~3.0%之间,而纤维土应力峰值出现在3.5%~4.5%之间,说明玻璃纤维的掺入提高了土体的残余强度。改良后的纤维土体可满足路用性要求,为纤维加筋土体治理提供参考。The study aims to solve the engineering geological disasters,such as uneven settlement and landslides,caused by the high liquid limit red clay in the western Zhejiang.In this paper,glass fiber reinforcement technology is used to improve red clay.Through the direct shear test and unconfined compression test,the mechanical properties of red clay with glass fibers of varying lengths and dosages are studied,and the evolution rule of mechanical properties indexes is analyzed.The experimental results show that the addition of glass fibers in red clay has improved significantly the shear strength of the soil,and that its cohesion is 1.68~2.22 times higher than that of plain soil.Its cohesion increases first and then decreases with an increase in the amount and length of glass fibers.The unconfined compressive strength of glass fiber red clay is 1.47~1.95 times higher than that of plain soil,increasing with the dosage and length of glass fibers.By analyzing the stress-strain curve,it is found that the peak stress of plain soil is between 2.5%and 3.0%,while that of fibrous soil is between 3.5%and 4.5%,indicating that the addition of glass fibers has improved the residual strength of the soil.The improved fibrous soil can meet the roadability requirements.The study provides reference for fiber reinforced soil treatment.

关 键 词：玻璃纤维红黏土 抗剪强度 无侧限抗压试验 应力-应变关系 应力峰值 

分 类 号：TU419.1[建筑科学—岩土工程]