纤维参数和围压对纤维加筋风沙土力学特性的影响

doi:10.13722/j.cnki.jrme.2015.0991

摘要
图/表
参考文献(16)
相关文章 (15)

全文: PDF (501 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要通过不固结不排水三轴压缩试验研究纤维长度(3～18 mm)、纤维掺量(0.1%～0.3%)和围压(30～300 kPa)对聚丙烯纤维三维加筋风沙土强度特性的影响。试验结果表明：在试验方案内，纤维长度、纤维掺量和围压的提高均能有效地增强纤维加筋风沙土的破坏强度和残余强度。随着纤维长度和掺量的增加，纤维加筋风沙土黏聚力提升显著，而内摩擦角提升微小。纤维长度的增加可使纤维加筋风沙土应变软化型过渡为应变硬化型，破坏韧性提高微小。随着纤维掺量的增加，3 mm纤维加筋风沙土始终保持为应变软化型，破坏韧性没有提升；9和18 mm纤维加筋风沙土均由应变软化型过渡为应变硬化型，破坏韧性明显提升。随着围压的增加，纤维加筋风沙土破坏韧性和应变硬化程度得以提高。破坏强度与围压关系以临界围压为转折点呈双线性。临界围压前，加筋作用主要体现为内摩擦角的提升；临界围压后，加筋作用主要体现在黏聚力的增强。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	赵莹莹1
	2
	凌贤长1
	张锋3
	李鹏1
	李琼林1
	李岩1

关键词 ：土力学, 风沙土, 三轴压缩试验, 破坏强度, 纤维长度与掺量, 围压

Abstract：The influences of fiber length(3–18 mm)，fiber content(0.1%–0.3%) and confining pressure(30– 300 kPa) on strength characteristics of polypropylene fiber reinforced aeolian sandy soil(FRASS) were investigated via unconsolidated-undrained triaxial compression tests. Fibers included in FRASS were randomly distributed. Test results show that failure strength and residual strength of FRASS are substantially enhanced with increasing fiber length，fiber content and confining pressure under given test schedule. The increase in fiber length or fiber content results in a significant increment in cohesion，but a negligible increment in internal friction angle. As fiber length increases，a transition from strain softening to strain hardening is observed for FRASS，while the ductility appears to be unchanged. As fiber content increases，FRASS with fiber length of 3 mm maintains strain softening state and its ductility almost has no change，on the contrary，FRASS with fiber length of 9 mm，as well as 18 mm，presents a transition behavior from strain softening to strain hardening and ductility deserves a remarkable increment. As confining pressure increases，the ductility and the degree of strain hardening of FRASS increase. Failure strength-confining pressure relationship of FRASS exhibits bilinear behavior with bilinearity break occurring at critical confining pressure. At confining pressures less than the critical，the reinforcing effect of fiber inclusion is more pronounced in increasing internal friction angle. At confining pressures higher than the critical，the reinforcing effect of fiber inclusion is more pronounced in the enhancement of cohesion.

Key words： soil mechanics aeolian sandy soil triaxial compression test failure strength fiber length and content confining pressure

引用本文:

赵莹莹1，2，凌贤长1，张锋3，李鹏1，李琼林1，李岩1. 纤维参数和围压对纤维加筋风沙土力学特性的影响[J]. 岩石力学与工程学报, 2015, 34(S2): 4426-4432.
ZHAO Yingying1，2，LING Xianzhang1，ZHANG Feng3，LI Peng1，LI Qionglin1，LI Yan1. EFFECTS OF FIBER PARAMETERS AND CONFINING PRESSURE ON MECHANICAL PROPERTIES OF FIBER REINFORCED AEOLIAN SANDY SOIL. , 2015, 34(S2): 4426-4432.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0991 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/4426

[1]	唐朝生，施斌，高玮，等. 含砂量对聚丙烯纤维加筋黏性土强度影响的研究[J]. 岩石力学与工程学报，2007，26(增1)：2 968- 2 973.(TANG Chaosheng，SHI Bin，GAO Wei，et al. Study on effects of sand content on strength of polypropylene fiber reinforced clay soil[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(Supp.1)：2 968-2 973.(in Chinese))
[2]	TANG CS，SHI B，GAO W，et al. Strength and mechanical behavior of short polypropylene fiber reinforced and cement stabilized clayey soil[J]. Geotextiles and Geomembranes，2007，25(3)：194-202.
[3]	王德银，唐朝生，李建，等. 纤维加筋非饱和黏性土的剪切强度特性[J]. 岩土工程学报，2013，35(10)：1 933-1 940.(WANG Deyin，TANG Chaosheng，LI Jian，et al. Shear strength characteristics of fiber-reinforced unsaturated cohesive soils[J]. Chinese Journal of Geotechnical Engineering，2013，35(10)：1 933-1 940.(in Chinese))
[4]	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)：2 225-2 230. (TANG Chaosheng，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)：2 225-2 230.(in Chinese))
[5]	TANGC S，SHI B，ZHAO L Z. Interfacial shear strength of fiber reinforced soil[J]. Geotextiles and Geomembranes，2010，28(1)：54-62.
[6]	张金利，蒋正国，杨钢. 聚丙烯纤维红黏土力学特性试验研究[J]. 岩土工程学报，2011，33(增)：420-425.(ZHANG Jinli，JIANG Zhengguo，YANG Gang. Experimental study on mechanical behaviors of polypropylene fiber reinforced clay[J]. Chinese Journal of Geotechnical Engineering. 2011，33(Supp.)：420-425.(in Chinese))
[7]	GRAY D H，OHASHI H. Mechanics of fiber reinforcement in sand[J]. Journal of Geotechnical Engineering，1983，109(3)：335-353.
[8]	MAHER M H，GRAY D H. Static response of sands reinforced with randomlydistributed fibers[J]. Journal of Geotechnical Engineering，1990，116(11)：1661-1677.
[9]	NATARAJM S，MCMANIS K L. Strength and deformation properties of soils reinforced with fibrillated fibers[J]. Geosynthetics International，1997，4(1)：65-79.
[10]	CONSOLIN C，FESTUGATO L，HEINECK K S. Strain-hardening behaviour of fibre-reinforced sand in view of filament geometry[J]. Geosynthetics International，2009，16(2)：109-115.
[11]	MAHER M H，HO Y C. Mechanical properties of kaolinite/fiber soil composite[J]. Journal of Geotechnical Engineering，1994，120(8)：1381-1393.
[12]	YETIMOGLU T，SALBAS O. A study on shear strength of sands reinforcedwith randomly distributed discrete fibers[J]. Geotextiles and Geomembranes，2003，21(2)：103-110.
[13]	MOHAMED A E M K. Improvement of swelling clay properties using hay fibers[J]. Construction and Building Materials，2013，38：242-247.
[14]	ANAGNOSTOPOULOSC A，PAPALIANGAS T T，KONSTANTINIDIS D，et al. Shear strength of sands reinforced with polypropylene fibers[J]. Geotechnical and Geological Engineering，2013，31(2)：401-423.
[15]	蔡奕，施斌，刘志彬，等.团聚体大小对填筑土强度影响的试验研究[J].岩土工程学报.2005，27(12)：1 482-1 486.(CAIYi，SHIBin，LIUZhibin，et al. Experimental study on effect of aggregate size on strength of filled soils[J].Chinese Journal of Geotechnical Engineering. 2005，27(12)：1 482-1 486.(in Chinese))
[16]	O'ROURKE T D，DRUSCHEL S J，NETRAVALI A N. Shear strength characteristicsof sand-polymer interfaces[J]. Journal of Geotechnical Engineering，1990，116(3)：451-469.