不同膨胀比下高聚物抗剪强度试验研究
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摘要
高聚物材料作为一种优良的注浆加固材料被逐步运用于岩土工程的众多领域,了解其强度和变形特性对深入了解高聚物注浆加固体的加固机理和综合强度有重要意义.基于此,采用直剪仪进行了不同膨胀比条件下高聚物的抗剪强度试验,研究了不同膨胀比下高聚物剪应力-位移、变形和强度特性.结果表明:高聚物膨胀比和竖向压应力对高聚物强度和剪胀特性影响较大;高聚物的剪应力-位移变化规律与黏土和砂土较为类似,剪切位移较小时剪应力快速上升,随后保持稳定;高聚物有与砂土十分接近的剪胀性,膨胀比和竖向压应力越低则剪胀性越明显;随着高聚物膨胀比的增加,其黏聚力和摩擦角均逐渐减小,近似呈幂函数关系.
Polymer is gradually used in geotechnical engineering as an excellent grouting material. It is important to understand the strength and deformation characteristics of polymer for studying the reinforcement mechanism and comprehensive strength of the polymer grouting solid. Based on this,a series of direct shear tests under the different expansion ratios are performed. The shear stress-shear displacement,deformation and strength characteristics of polymer under the different expansion ratio are investigated. The results show that the expansion ratio and the vertical compressive stress have a great influence on the strength and dilatancy of the polymer. The shear stress increases rapidly during the smaller shear displacement and remains unchanged with the increasing of shear displacement which is very similar to the sand and clay. The lower expansion ratio and vertical compressive stress,the more dilatancy,which is similar to that of sand. With increasing of polymer expansion ratio,the cohesion and friction angle are gradually reduced. The relationship between expansion ration with cohesion and friction angle can be approximately simulated by the power functions.
Polymer is gradually used in geotechnical engineering as an excellent grouting material. It is important to understand the strength and deformation characteristics of polymer for studying the reinforcement mechanism and comprehensive strength of the polymer grouting solid. Based on this,a series of direct shear tests under the different expansion ratios are performed. The shear stress-shear displacement,deformation and strength characteristics of polymer under the different expansion ratio are investigated. The results show that the expansion ratio and the vertical compressive stress have a great influence on the strength and dilatancy of the polymer. The shear stress increases rapidly during the smaller shear displacement and remains unchanged with the increasing of shear displacement which is very similar to the sand and clay. The lower expansion ratio and vertical compressive stress,the more dilatancy,which is similar to that of sand. With increasing of polymer expansion ratio,the cohesion and friction angle are gradually reduced. The relationship between expansion ration with cohesion and friction angle can be approximately simulated by the power functions.
引文
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[17]朱俊高,徐佳成,史江伟,等.密度对砂土应力应变强度特性影响试验研究[J].岩土工程学报,2016,38(2):336-341.
[18]张家铭,张凌,刘慧,等.钙质砂剪切特性试验研究[J].岩石力学与工程学报,2008,27(增刊1):3010-3015.
[19]陆勇,周国庆,赖泽金.砂土剪切特性的荷载与粒径效应研究[J].中国矿业大学学报,2014,43(2):195-202.
[20]张奎,李梦姿,杨贝贝.含水率和干密度对重塑黄土抗剪强度的影响[J].安徽理工大学学报,2016,36(3):74-79.
[2] BARTON B. Kansas DOT decides to go with polyurethane to correct 50 miles of highway 50[J]. Roads&Bridges,2004,42(12):24-26.
[3] VENNAPUSA P K R,ZHANG Y,WHITE D J. Comparison of pavement slab stabilization using cementitious grout and injected polyurethane foam[J]. Journal of Performance of Constructed Facilities,2016,30(6):1-13.
[4] DERSCHM S,TUTUMLUERE,PEELERCT,et al.Polyurethanecoating ofrailroadballastaggregateforimprovedperformance[C]//2010JointRailConference.April 27-29,2010,Urbana.Illinois,USA.NewYork:ASME,2010:337-342.
[5] WOODWARD P K,KACIMI A E,LAGHROUCHE O,et al. Application of polyurethane geocomposites to help maintain track geometry for high-speed ballasted railway tracks[J]. Journal of Zhejiang University-Science A(Applied Physics&Engineering),2012,13(11):836-849.
[6]边学成,程翀,王复明,等.高速铁路路基沉降高聚物注浆修复后动力性能及长期耐久性的试验研究[J].岩土工程学报,2014,36(3):562-568.
[7]刘平,刘汉龙,肖杨,等.高聚物胶凝堆石料静力特性试验研究[J].岩土力学,2015,36(3):749-754.
[8]王复明,徐建国,杨柳,等.堤坝高聚物防渗墙静力荷载试验与数值分析[J].建筑科学与工程学报,2015,32(2):27-34.
[9]石明生,刘恒,钟燕辉,等.聚氨酯高聚物灌浆材料锚固力试验研究[J].中国港湾建设,2011(3):10-13.
[10] WITKIEWICZ W,ZIELINSHI A. Properties of the polyurethane(PU)light foams[J]. Advances in Materials Science,2006,6(2):35-51.
[11] WEI Y,WANG F,GAO X,et al. Microstructure and fatigue performance of polyurethane grout materials under compression[J].Journal of Materials in Civil Engineering,2017,29(9):1-8.
[12]卢子兴,寇长河,李怀祥.泡沫塑料拉伸力学特性的研究[J].北京航空航天大学学报,1998,24(6):646-649.
[13]张旭.高聚物注浆材料蠕变特性试验研究[D].郑州:郑州大学,2012.
[14]郑新国,李书明,谢永江,等.高聚物注浆材料密度与力学行为关系研究[J].武汉理工大学学报,2014,36(4):44-47.
[15]高翔,黄卫,魏亚,等.聚氨酯高聚物注浆材料抗压强度测试与模拟[J].复合材料学报,2017,34(2):438-445.
[16]陈铁林,周成,沈珠江.结构性黏土压缩和剪切特性试验研究[J].岩土工程学报,2004,26(1):31-35.
[17]朱俊高,徐佳成,史江伟,等.密度对砂土应力应变强度特性影响试验研究[J].岩土工程学报,2016,38(2):336-341.
[18]张家铭,张凌,刘慧,等.钙质砂剪切特性试验研究[J].岩石力学与工程学报,2008,27(增刊1):3010-3015.
[19]陆勇,周国庆,赖泽金.砂土剪切特性的荷载与粒径效应研究[J].中国矿业大学学报,2014,43(2):195-202.
[20]张奎,李梦姿,杨贝贝.含水率和干密度对重塑黄土抗剪强度的影响[J].安徽理工大学学报,2016,36(3):74-79.