[1]付冬平,张 弘,林春秀,等.纤维掺量对花岗岩残积土剪切特性的影响[J].华南地震,2024,(01):165-174.[doi:10.13512/j.hndz.2024.01.19]
 FU Dongping,ZHANG Hong,LIN Chunxiu,et al.Effect of Fiber Content on Shear Characteristics of Granite Residual Soil[J].,2024,(01):165-174.[doi:10.13512/j.hndz.2024.01.19]
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纤维掺量对花岗岩残积土剪切特性的影响()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2024年01期
页码:
165-174
栏目:
土木工程防震减灾
出版日期:
2024-03-30

文章信息/Info

Title:
Effect of Fiber Content on Shear Characteristics of Granite Residual Soil
文章编号:
1001-8662(2024)01-0165-10
作者:
付冬平1张 弘1林春秀1张欣亚2
1.北京市市政工程设计研究总院有限公司,北京 100082;2.上海大学力学与工程科学学院,上海 200444
Author(s):
FU Dongping1ZHANG Hong1LIN Chunxiu1ZHANG Xinya2
1.Beijing General Municipal Engineering Design&Research Institute Co., Ltd., Beijing 100082, China ;2.School of Mechanics and Engineering Science , Shanghai University , Shanghai 200444, China
关键词:
纤维加筋聚丙烯纤维直剪试验抗剪强度
Keywords:
Fiber reinforced soil Polypropylene fiber Interface between geogrid and soil Direct shear testShear strength
分类号:
TU443
DOI:
10.13512/j.hndz.2024.01.19
文献标志码:
A
摘要:
为探究纤维掺量对花岗岩残积土的剪切特性的影响,采用气动直剪仪对纤维加筋花岗岩残积土试样进行直剪试验。考虑纤维掺量、剪切速率、竖向应力等因素,分析不同剪切速率和竖向应力下纤维掺量对花岗岩残积土剪切特性的影响。试验结果表明:竖向应力为300kPa时,与未掺纤维相比,纤维掺量分别为0.3%、0.6%、0.9%时,剪切强度分别增加了23%、46.1%、79.2%,即掺加纤维对花岗岩残积土剪切强度有明显的增强作用。内摩擦角随着纤维掺量的增加而增大,黏聚力随着纤维掺量的增加而增加。低竖向应力下,土样先剪缩再剪胀;高竖向应力下,土样只发生剪缩。在低速剪切的情况下,剪切速率对花岗岩残积土的剪切强度特性影响较小;剪胀程度随剪切速率增加而增强。
Abstract:
In order to investigate the shear characteristics of the residual soil under different fiber content,direct shear tests were carried out on the residual soil by using pneumatic direct shear apparatus. Considering fiber content, shear rate, vertical stress and other factors, the effect of fiber content on the shear characteristics of residual soil under different shear rates and vertical stresses is analyzed. The test results show that when the vertical stress is 300 kPa, compared with the undoped fiber, with the fiber content increase from 0 to 0.3%, 0.6% and 0.9%, shear strength increases by 23%, 46.1% and 79.2%, respectively, that is, the addition of fiber has a significant enhancement effect on the shear strength of granite residual soil. The internal friction angle increases with the increase of fiber content,and the cohesion decreases significantly with the increase of fiber content. Under low vertical stress, the soil is first dilatational and then shrunken, and under high vertical stress, the soil is shrunken constantly. In the case of low-speed shear, the shear rate has little effect on the shear strength characteristics of granite residual soil. The degree of shear expansion increases with increasing shear rate.

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备注/Memo

备注/Memo:
收稿日期:2023-09-10
基金项目:国家自然科学基金资助项目(51678352)
作者简介:付冬平(1977-),男,硕士,高级工程师,主要从事岩土工程专业方面的研究。E-mail:47160390@qq.com
更新日期/Last Update: 2024-03-30