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浙江大学学报(工学版)  2022, Vol. 56 Issue (1): 111-117    DOI: 10.3785/j.issn.1008-973X.2022.01.012
土木工程、水利工程     
循环加卸载下纤维增强泡沫轻质土变形特性
许江波1,2,3(),王元直1,祁玉1,曹宝花1,骆永震1,晏长根1,杨晓华1,包含1,向钰周4
1. 长安大学 公路学院, 陕西 西安 710064
2. 山区道路工程与防灾减灾技术国家地方联合工程实验室, 重庆 400067
3. 信息产业部电子综合勘察研究院, 陕西 西安 710064
4. 重庆市城投路桥管理有限公司, 重庆 400015
Deformation characteristics of fiber-reinforced foam lightweight soil under cyclic loading and unloading
Jiang-bo XU1,2,3(),Yuan-zhi WANG1,Yu QI1,Bao-hua CAO1,Yong-zhen LUO1,Chang-gen YAN1,Xiao-hua YANG1,Han BAO1,Yu-zhou XIANG4
1. Highway School, Chang’an University, Xi’an 710064, China
2. National Local Joint Engineering Laboratory for Road Engineering and Disaster Prevention and Reduction Technology in Mountainous Areas, Chongqing 400067, China
3. China Electronic Research Institute of Engineering Investigations and Design, Xi’an 710064, China
4. Chongqing Chengtou Road and Bridge Administration Limited Company, Chongqing 400015, China
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摘要:

为了研究聚丙烯纤维增强泡沫轻质土的损伤变形特性,选用UNSAT非饱和土三轴仪开展50 kPa围压作用下的循环加卸载试验. 以泊松比、弹性模量提高率及弹塑性变形趋势为参数,分析不同纤维质量分数条件下聚丙烯纤维增强泡沫轻质土的力学特性和变形规律. 研究结果表明:当纤维质量分数达到0.50%~1.00%时,初次弹性模量提高率为56.88%~69.43%,纤维对泡沫轻质土内部初始缺陷的改善作用最佳;纤维增强泡沫轻质土试样的弹性模量提高率随着循环次数的增加呈先增大后减小的趋势,泊松比随着循环次数的增加而增大,在经历最初的2、3次循环荷载作用后趋于稳定直至试样破坏;随着循环次数的增加,纤维增强泡沫轻质土的轴向弹性应变与总应变之比逐渐降低,试样内部损伤变形逐渐累积.

关键词: 纤维增强泡沫轻质土循环加卸载弹性模量损伤变形泊松比    
Abstract:

The UNSAT unsaturated soil triaxial instrument was used to conduct cyclic loading and unloading tests under 50 kPa confining pressure in order to analyze the damage and deformation characteristics of polypropylene fiber-reinforced foamed lightweight soil. The mechanical properties and deformation laws of polypropylene fiber reinforced foam lightweight soil under different fiber mass fraction conditions were analyzed by using Poisson’s ratio, elastic modulus increase rate and elastic-plastic deformation trend as parameters. The research results showed that the initial elastic modulus increase rate was 56.88%-69.43% when the fiber mass fraction reached 0.50% to 1.00%. The fiber has the best effect on improving the initial defects of the foamed lightweight soil. The elastic modulus increase rate of the fiber-reinforced foamed lightweight soil sample firstly increases and then decreases with the increase of the number of cycles. The Poisson’s ratio increases with the increase of the number of cycles, and tends stable after the first 2 and 3 cycles of loading until the sample is broken. The ratio of the axial elastic strain to the total strain of the fiber-reinforced foam lightweight soil gradually decreases as the number of cycles increases, and the internal damage and deformation of the sample gradually accumulate.

Key words: fiber-reinforced foam lightweight soil    cyclic loading and unloading    elastic modulus    damage deformation    Poisson’s ratio
收稿日期: 2021-03-06 出版日期: 2022-01-05
CLC:  U 416  
基金资助: 国家重点研发计划资助项目(2016YFC0802203-8);长安大学中央高校基本科研业务费专项资金资助项目(300102219213);国家自然科学基金资助项目(41790443);陕西省重点研发计划资助项目(2018ZDXM-SF-024);中国博士后科学基金资助项目 (2020M683244)
作者简介: 许江波(1985—),男,副教授,从事岩土工程与隧道工程的研究. orcid.org/0000-0003-1567-0931. E-mail: xujiangbo@yeah.net
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引用本文:

许江波,王元直,祁玉,曹宝花,骆永震,晏长根,杨晓华,包含,向钰周. 循环加卸载下纤维增强泡沫轻质土变形特性[J]. 浙江大学学报(工学版), 2022, 56(1): 111-117.

Jiang-bo XU,Yuan-zhi WANG,Yu QI,Bao-hua CAO,Yong-zhen LUO,Chang-gen YAN,Xiao-hua YANG,Han BAO,Yu-zhou XIANG. Deformation characteristics of fiber-reinforced foam lightweight soil under cyclic loading and unloading. Journal of ZheJiang University (Engineering Science), 2022, 56(1): 111-117.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.01.012        https://www.zjujournals.com/eng/CN/Y2022/V56/I1/111

l/mm d/μm ρ/(g·cm?3 tb/℃ tm/℃ a/% E/MPa $ \sigma $/MPa 纤维类型 分散性 抗酸碱性能
12 31 0.91 580 160~180 10-28 ≥3850 ≥500 束状单丝 极好 极高
表 1  聚丙烯纤维的基本参数
序号 mw/mc mw/kg mc/kg mf/kg
01 1∶1.60 221.85 354.96 23.19
02 1∶1.65 217.63 359.09 23.29
03 1∶1.70 213.56 363.05 23.39
04 1∶1.75 209.64 366.88 23.48
05 1∶1.80 205.87 370.56 23.57
06 1∶1.85 202.23 374.12 23.66
07 1∶1.90 198.71 377.55 23.74
表 2  泡沫轻质土试配配合质量比的设计值
图 1  泡沫轻质土流值随水灰质量比的变化曲线
图 2  泡沫轻质土湿重度随水灰质量比的变化曲线
图 3  泡沫轻质土7 d无侧限抗压强度随水灰质量比的变化曲线
图 4  GDS非饱和土三轴仪
图 5  试验结束后的试样状态
图 6  试验结束后不同纤维质量分数试样顶部破损情况的对比图
图 7  泊松比与循环加卸载次数的关系曲线
序号 n/% En/%
01 0 154.97
02 0.25 107.75
03 0.50 56.88
04 0.75 65.76
05 1.00 69.43
06 1.25 138.38
07 1.50 185.78
表 3  不同纤维质量分数泡沫轻质土初次加载弹性模量提高率的统计表
图 8  弹性模量与循环加卸载次数的关系曲线
图 9  归一化后各纤维质量分数下泡沫轻质土轴向弹性应变随循环次数变化的曲线
图 10  归一化后各纤维质量分数下泡沫轻质土径向弹性应变随循环次数的变化曲线
图 11  归一化后各纤维质量分数下泡沫轻质土径向塑性应变随循环次数的变化曲线
图 12  归一化后各纤维质量分数下泡沫轻质土轴向塑性应变随循环次数的变化曲线
1 陈忠平. 气泡混合轻质填土新技术[M]. 北京: 人民交通出版社, 2006.
2 蔡力, 陈忠平, 吴立坚 气泡混合轻质土的主要力学特性及应用综述[J]. 公路交通科技, 2005, 22 (12): 71- 74
CAI Li, CHEN Zhong-ping, WU Li-jian A summary of the main mechanical properties and applications of bubble-mixed light soils[J]. Journal of Highway and Transportation Research and Development, 2005, 22 (12): 71- 74
doi: 10.3969/j.issn.1002-0268.2005.12.019
3 KIKUCHI Y, NAGATOME T, MIZUTANI T, et al. The effect of air foam inclusion on the permeability and absorption properties of light weight soil[J. Soils and Foundations, 2011, 51(1): 151-165.
4 李硕, 杨军宏. 泡沫轻质土在高速公路改扩建工程中的应用[J]. 公路交通科技, 2018, 35(增1): 1-6.
LI Shuo, YANG Jun-hong. The application of foam light soil in highway reconstruction and expansion project [J]. Journal of Highway and Transportation Research and Development. 2018, 35(Supple. 1): 1-6.
5 蔡国庆, 韩博文, 蔡德钩, 等 高速铁路泡沫轻质土路基动力响应分析[J]. 北京交通大学学报, 2019, 43 (3): 8- 15
CAI Guo-qing, HAN Bo-wen, CAI De-gou, et al Dynamic response analysis of high-speed railway foam light soil subgrade[J]. Journal of Beijing Jiaotong University, 2019, 43 (3): 8- 15
6 刘楷, 李仁民, 杜延军, 等 气泡混合轻质土干湿循环和硫酸钠耐久性试验研究[J]. 岩土力学, 2015, 36 (Supple.1): 362- 366
LIU Kai, LI Ren-min, DU Yan-jun, et al Experimental study on dry-wet cycling and sodium sulfate durability of air-bubble mixed lightweight soil[J]. Rock and Soil Mechanics, 2015, 36 (Supple.1): 362- 366
7 李明东, 田安国 泡沫塑料混合轻质土在循环荷载下的力学性质[J]. 岩土工程学报, 2010, 32 (11): 1806- 1810
LI Ming-dong, TIAN An-guo Mechanical properties of foamed plastic mixed lightweight soil under cyclic loading[J]. Chinese Journal of Geotechnical Engineering, 2010, 32 (11): 1806- 1810
8 赵文辉, 苏谦, 李婷, 等 高速铁路基床底层泡沫轻质土填料试验研究[J]. 振动与冲击, 2019, 38 (6): 179- 186
ZHAO Wen-hui, SU Qian, LI Ting, et al Experimental study on foamed lightweight soil filling at the bottom of high-speed railway subgrade[J]. Journal of Vibration and Shock, 2019, 38 (6): 179- 186
9 欧孝夺, 彭远胜, 莫鹏, 等 掺铝土尾矿泡沫轻质土的物理力学及水力特性研究[J]. 材料导报, 2020, 34 (Supple.1): 241- 245
OU Xiao-duo, PENG Yuan-sheng, MO Peng, et al Study on the physical mechanics and hydraulic properties of foam light soil mixed with bauxite tailings[J]. Materials Reports, 2020, 34 (Supple.1): 241- 245
10 詹炳根, 郭建雷, 林兴胜 玻璃纤维增强泡沫混凝土性能试验研究[J]. 合肥工业大学学报:自然科学版, 2009, 32 (2): 226- 229
ZHAN Bing-gen, GUO Jian-lei, LIN Xing-sheng Experimental study on the performance of glass fiber reinforced foam concrete[J]. Journal of Hefei University of Technology: Natural Science Edition, 2009, 32 (2): 226- 229
doi: 10.3969/j.issn.1003-5060.2009.02.021
11 陈婷婷. 纤维增强泡沫轻质混凝土基床表层结构的力学性能分析[D]. 成都: 西南交通大学, 2017.
CHEN Ting-ting. Analysis of mechanical properties of surface structure of fiber reinforced foam lightweight concrete base bed [D]. Chengdu: Southwest Jiaotong University, 2017.
12 李启金, 李国忠, 杜传伟 改性聚丙烯纤维对发泡水泥性能的影响[J]. 复合材料学报, 2013, 30 (3): 14- 20
LI Qi-jin, LI Guo-zhong, DU Chuan-wei Effect of modified polypropylene fiber on the properties of foamed cement[J]. Acta Materiae Compositae Sinica, 2013, 30 (3): 14- 20
13 余其俊, 林秋旺, 李方贤, 等 硅酸钙板-纤维增强泡沫混凝土复合墙板的受压性能[J]. 华南理工大学学报:自然科学版, 2017, 45 (9): 88- 95
YU Qi-jun, LIN Qiu-wang, LI Fang-xian, et al Compression performance of calcium silicate board-fiber reinforced foam concrete composite wallboard[J]. Journal of South China University of Technology: Natural Science Edition, 2017, 45 (9): 88- 95
doi: 10.3969/j.issn.1000-565X.2017.09.013
14 邢锋, 冷发光, 冯乃谦, 等 克裂速纤维增强混凝土抗裂性能[J]. 复合材料学报, 2002, 19 (6): 120- 124
XING Feng, LENG Fa-guang, FENG Nai-qian, et al Crack resistance of fiber reinforced concrete with crack speed[J]. Acta Materiae Compositae Sinica, 2002, 19 (6): 120- 124
doi: 10.3321/j.issn:1000-3851.2002.06.023
15 马一平, 李国友, 杨利香, 等 表观密度和聚丙烯纤维对泡沫混凝土收缩开裂的影响[J]. 材料导报, 2012, 26 (6): 121- 125
MA Yi-ping, LI Guo-you, YANG Li-xiang, et al The influence of apparent density and polypropylene fiber on the shrinkage and cracking of foam concrete[J]. Materials Reports, 2012, 26 (6): 121- 125
doi: 10.3969/j.issn.1005-023X.2012.06.033
16 许江波, 王元直, 骆永震, 等 加筋泡沫轻质土三轴剪切力学特性[J]. 交通运输工程学报, 2020, 20 (4): 120- 133
XU Jiang-bo, WANG Yuan-zhi, LUO Yong-zhen, et al Triaxial shear mechanical properties of reinforced foamed lightweight soil[J]. Journal of Traffic and Transportation Engineering, 2020, 20 (4): 120- 133
17 周顺鄂, 卢忠远, 焦雷, 等 泡沫混凝土压缩特性及抗压强度模型[J]. 武汉理工大学学报, 2010, 32 (11): 9- 13
ZHOU Shun-e, LU Zhong-yuan, JIAO Lei, et al Compression property and compression strength model of foamed concrete[J]. Journal of Wuhan University of Technology, 2010, 32 (11): 9- 13
doi: 10.3963/j.issn.1671-4431.2010.11.003
18 苏谦, 赵文辉, 王亚威, 等 泡沫轻质混凝土单轴循环加卸载试验研究[J]. 铁道标准设计, 2016, 60 (8): 21- 25
SU Qian, ZHAO Wen-hui, WANG Ya-wei, et al Experiment of foamed lightweight concrete under uniaxial cyclic loading and unloading conditions[J]. Railway Standard Design, 2016, 60 (8): 21- 25
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