基于单根纤维拉拔试验的波形纤维加筋土界面强度研究

李建; 唐朝生; 王德银; 施斌; 裴向军

doi:10.11779/CJGE201409017

基于单根纤维拉拔试验的波形纤维加筋土界面强度研究 English Version

1. 南京大学地球科学与工程学院, 江苏南京 210023;
2. 成都理工大学地质灾害防治与地质环境保护国家重点实验,四川成都 610059

基金项目: 国家自然科学基金优秀青年科学基金项目（41322019）; 国家自然科学基金重点项目(41230636); 江苏省自然科学基金项目(BK2011339); 地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2013K010)

详细信息

作者简介:
李建(1989- ),男,江苏扬州人,硕士研究生,主要从事环境岩土工程和工程地质方面的研究工作。E-mail: ljspeci@163.com。

通讯作者:
唐朝生

中图分类号: TU47
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出版历程
- 收稿日期: 2014-01-19
- 发布日期: 2014-09-21

Single fiber pullout tests on interfacial shear strength of wave-shape fiber-reinforced soils

1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;
2. Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China

摘要

摘要: 纤维/土界面间的力学作用特性是决定纤维加筋土工程性质的关键因素。为了改善纤维/土界面作用力,开发了一种新型的波形纤维作为加筋材料,并自主设计了一套拉拔试验装置,对单根纤维加筋土开展了多组拉拔试验,定量获得了波形纤维加筋土的拉拔特性及界面剪切强度,通过与传统直线形纤维对比,分析了波形纤维/土界面的力学作用机理,并从理论上探讨了波形纤维的最大临界加筋长度。结果表明：提出的单根纤维拉拔试验方法及设计的试验装置为研究纤维/土界面力学作用提供了有效的途径,试验结果具有较好的可重复性;直线形纤维的拉拔曲线呈典型的单峰特征,拉力达到峰值后迅速减小到残余值并逐渐趋于稳定,而波形纤维的拉拔曲线呈显著的多峰特征,曲线波长与纤维的波长基本一致;通过对比,波形纤维/土界面剪切强度明显高于直线形纤维,强度值提高了178%,极大改善了纤维的加筋效果,此外,波形纤维拉拔曲线各峰值对应的界面剪切强度及残余剪切强度随拉拔位移呈指数递减趋势;利用测得的纤维/土界面剪切强度,结合纤维自身的抗拉强度和一些假设条件,能确定纤维的最大临界加筋长度,对实际工程设计有一定参考意义。
- 波形纤维加筋土 /
- 拉拔试验 /
- 界面剪切强度 /
- 界面力学作用 /
- 临界加筋长度 /
- 纤维加筋机理
Abstract: The interfacial mechanical interaction between fibers and soils is the key factor controlling the engineering properties of fiber-reinforced soils. In order to improve thee mechanical properties of fiber-soil interface, a new wave-shape fiber is developed as a reinforcement material. An innovative pullout test device is designed. By applying this device, a series of single fiber pullout tests are carried out on fiber-reinforced soil samples. The pullout characteristics and interfacial shear strength of wave-shape fiber-reinforced soils are quantitatively obtained. As compared to the conventional straight fibers, the interfacial mechanical interaction character of wave-shape fiber-reinforced soils is analyzed. Moreover, the maximum critical reinforcement length and techniques of wave-shape fibers are discussed. The results show that the proposed single fiber pullout test method and the designed pullout test device are effective to quantify the interfacial mechanical behaviours of the fiber-reinforced soils, with simple operation and good repeatability. The pullout curves of straight fiber present a typical single peak characteristic. As the pullout load reaches the peak value, it decreases rapidly to the residual value, and then gradually reaches stabilization. However, the pullout curves of the wave-shape fibers present a typical characteristic of multiple peaks, and the wavelength of the curve is consistent with that of the wave-shape fibers. It is found that the interfacial shear strength of the wave-shape fiber-soil is significantly higher than that of the conventional straight fiber, and the corresponding strength increases by 178%. It indicates that the wave-shape fibers can dramatically improve the reinforcement benefit as compared with the straight fibers. In addition, the interfacial shear strength and residual shear strength, which are corresponding to the peak values of wave-shape fiber pullout curve, generally decrease exponentially with an increase in pullout displacement. According to the measured fiber-soil interfacial shear strength,
- wave-shape fiber-reinforced soil /
- pullout test /
- interfacial shear strength /
- interfacial mechanical interaction /
- critical fiber length /
- fiber reinforcement mechanism

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参考文献(30)

[1]	吴景海, 王德群, 陈环．土工合成材料加筋砂土三轴试验研究[J]. 岩土工程学报, 2000, 22(2): 199-204. (WU Jing-hai, WANG De-qun, CHEN Huan. Study on geosysthetic reinforced sand by triaxial compression test[J]. Chinese Journal of Geotechnical Engineering, 2000, 22(2): 199-204. (in Chinese))
[2]	吴景海, 陈环, 王玲娟, 等. 土工合成材料与土界面作用特性的研究[J]. 岩土工程学报, 2001, 23(1): 89-93. (WU Jing-hai, CHEN Huan, WANG Ling-juan, et al. Study on soil interaction characteristics of geosynthetics[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(1): 89-93. (in Chinese))
[3]	陈永辉, 赵维炳, 汪志强. 一个加筋复合土体的本构关系[J]. 水利学报, 2002, 12: 26-32. (CHEN Yong-hui, ZHAO Wei-bing, WANG Zhi-qiang. The constitutive relationship of reinforced soil[J]. Journal of Hydraulic Engineering, 2002, 12: 26-32. (in Chinese))
[4]	张功新, 莫海鸿, 曾庆军, 等. 土工合成材料对路堤长期稳定性及工后沉降的负面影响分析[J]. 岩土工程学报, 2005, 27(6): 686-689. (ZHANG Gong-xin, MO Hai-hong, ZENG Qing-jun, et al. Analysis of negative effect of geotextile on long term stability and post construction settlement of embankment[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(6): 686-689. (in Chinese))
[5]	刘华北. 地震作用下模块式面板土工合成材料加筋土挡墙的内部稳定分析[J]．岩土工程学报, 2008, 29(6): 917-921. (LIU Hua-bei. Internal stability analysis of segmental geosynthetic reinforced soil retaining walls subjected to seismic loading[J]. Chinese Journal of Geotechnical Engineering, 2008, 29( 6) : 917-921. (in Chinese))
[6]	郭大华. 土工合成材料在公路软基处理中的应用与设计[J]．土木工程学报, 2001, 34(3): 84-89. (GUO Da-hua. Application and design of geosynthetics to reinforced highway bed[J]. China Civil Engineering Journal,2001, 34(3): 84-89. (in Chinese))
[7]	PRABAKARA J, SRIDHAR R. Effect of random inclusion of sisal fiber on strength behavior of soil[J]. Construct Build Mater, 2002, 16:123-31.
[8]	吴燕开, 牛斌, 桑贤松. 随机分布剑麻纤维加筋土力学性能试验研究[J]. 水文地质工程地质学报, 2012, 39(6): 77-81. (WU Yan-kai, NIU Bin, SANG Xian-song. Experimental study on mechanical properties of fiber- reinforced soil with random distribution[J]. Hydrogeology & Engineering Geology, 2012, 39(6): 77-81. (in Chinese))
[9]	雷胜友, 丁万涛. 加筋纤维抑制膨胀土膨胀性的试验[J]. 岩土工程学报, 2005, 27(4): 482-485. (LEI Sheng-you, DING Wan-tao. Experimental investigation on restraining the swell of expansive soil with fibre-reinforcement[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(4): 482-485. (in Chinese))
[10]	唐朝生, 施斌, 高玮, 等. 纤维加筋土中单根纤维的拉拔试验及临界加筋长度的确定[J]. 岩土力学, 2009, 30(8): 2225-2230. (TANG Chao-sheng, SHI Bin, GAO Wei, et al. Single fiber pull-out test and the determination of critical fiber reinforcement length for fiber reinforced soil[J]. Rock and Soil Mechanics, 2009, 30(8): 2225-2230. (in Chinese))
[11]	VISWANADHAM S, PHANIKUMAR R, MUKHERJEE V. Swelling behavior of a geofiber-reinforced expansive soil[J]. Geotextile and Geomembranes, 2009, 27: 73-76.
[12]	TANG CS, SHI B, GAO W, et al. Strength and mechanical behavior of short polypropylene fiber reinforced and cement stabilized clayey soil[J]. Geotextile and Geomembranes, 2007, 25: 194-202.
[13]	张小江, 周克骥, 周景星. 纤维加筋土的动力特性试验研究[J]. 岩土工程学报, 1998, 20(3): 45-49. (ZHANG Xiao-jiang, ZHOU Ke-ji, ZHOU Jing-xing. Experimental study on dynamic properties of cohesive soil reinforced with fibers[J]. Chinese Journal of Geotechnical Engineering, 1998, 20(3): 45-49. (in Chinese))
[14]	AKBULUT S, ARASAN S, KALKAN E. Modification of clayey soils using scrap tire rubber and synthetic fibers[J]. Applied Clay Science, 2007, 38(1/2): 23-32.
[15]	陈轮, 李广信. 纤维加筋粘性土的抗拉和抗裂性能研究[J]. 地基处理, 1992, 3(2): 25-31. (CHEN Lun, LI Guang-xin. Tensile strength and crack resistance of fiber reinforced cohesive soil[J]. Ground Improvement, 1992, 3(2): 25-31. (in Chinese))
[16]	李广信, 陈轮, 郑继勤, 等. 纤维加筋黏性土的试验研究[J]. 水利学报, 1995(6): 31-36. (LI Guang-xin, CHEN Lun, ZHENG Ji-qin, et al. Experimental study on fiber-reinforced cohesive soil[J]. Journal of Hydraulic Engineering, 1995(6): 31-36. (in Chinese))
[17]	介玉新, 李广信, 陈轮. 纤维加筋土和素土边坡的离心模型试验研究[J]. 岩土工程学报, 1998, 20(4): 12-15. (JIE Yu-xin, LI Guang-xin, CHEN Lun. Study on centrifugal model tests on texile and cohesive soil slopes[J]. Chinese Journal of Geotechnical Engineering, 1998, 20(4): 12-15. (in Chinese))
[18]	PUPPALA J, MUSENDA C. Effects of fiber reinforcement on strength and volume change in expansive soils[J]. Transportation Research Record: Journal of the Transportation Research Board, 2000, 1736(1): 134-140.
[19]	唐朝生, 施斌, 蔡奕, 等. 聚丙烯纤维加固软土的试验研究[J]. 岩土力学,2007, 28(9): 1796-1800. (TANG Chao-sheng, SHI Bin, CAI Yi, et al. Experimental study on polypropylene fiber improving soft soils[J]. Rock and Soil Mechanics, 2007, 28(9): 1796-1800. (in Chinese))
[20]	CAI Y, SHI B, NG C W W, et al. Effect of polypropylene fibre and lime admixture on engineering properties of clayey soil[J]. Engineering Geology, 2006, 87(3/4): 230-240.
[21]	王德银, 唐朝生, 李建, 等. 纤维加筋土非饱和黏性土的剪切强度特性[J]. 岩土工程学报, 2013, 35(10): 1933-1940. (WANG De-yin, TANG Chao-sheng, LI Jian, et al. Shear strength characteristics of fiber-reinforced unsaturated cohesive soils[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(10): 1933-1940. (in Chinese))
[22]	蔡奕, 施斌, 高玮, 等. 纤维石灰土工程性质的试验研究[J]. 岩土工程学报, 2006, 28(10): 1283-1287. (CAI Yi, SHI Bin, GAO Wei, et al. Experimental study on engineering properties of fibre-lime treated soils[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(10): 1283-1287. (in Chinese))
[23]	MARANDI M, BAGHERIPOUR H, RAHGOZAR R, et al. Strength and ductility of randomly distributed palm fibers reinforced silty-sand soils[J]. Am J Appl Sci, 2008, 5: 209-20.
[24]	NATARAJ M S, MCMANIS K L. Strength and deformation roperties of soils reinforced with fibrillated fibers[J]. Geosynthetics International, 1997, 4(1): 65-79.
[25]	MESBAH A, MOREL JC, WALKER P, et al. Development of a direct tensile test for compacted earth blocks reinforced with natural fibers[J]. Journal of Materials in Civil Engineering, 2004, 16(1): 95-98.
[26]	李建, 唐朝生, 王德银, 等. 纤维加筋土的抗拉强度试验研究[J]. 工程地质学报, 2012, 20(增刊1): 1004-9665. (LI Jian, TANG Chao-sheng, WANG De-yin, et al. Experimental study on the tensile strength of fiber reinforced soil[J]. Journal of Engineering Geology, 2012, 20(S1): 1004-9665. (in Chinese))
[27]	CONSOLI NC, CASAGRANDE MDT, PRIETTO PDM, et al. Plate load test on fiber-teinforced soil[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2003, 129(10): 951-955.
[28]	SANTONI L, WEBSTER L. Airfields and road construction using fiber stabilization of sands[J]. J Trans Eng, ASCE, 2001, 127: 96-104.
[29]	TINGLE J, SANTONI R, WEBSTER S. Full-scale field tests of discrete fiber-reinforced sand[J]. Journal of Transportation Engineering, 2002, 128(1): 9-16.
[30]	TANG C, SHI B, ZHAO L. Interfacial shear strength of fiber reinforced soil[J]. Geotextile and Geomembranes, 2010, 28(1): 54-62.