Shaking Table Model Tests for Composite Reinforced Slopes
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摘要: 废旧轮胎、三向土工格栅等新型筋材用于岩土工程加筋,经济环保且力学性能优良.采用振动台模型试验,分别对未加筋边坡、三向土工格栅边坡、废旧轮胎串与三向土工格栅复合加筋边坡、轮胎串与轮胎碎片复合加筋边坡模型在地震作用下的动力响应性能进行了研究,探讨了边坡结构在不同地震波形输入、不同加速度峰值和不同加筋方式下,未加筋边坡与复合加筋边坡的加速度分布规律.试验结果表明:加筋方式对加筋抗震效果影响比较显著,同种加筋方式的加速度响应效果在不同地震波作用下规律相近;三向格栅、三向格栅与轮胎串复合加筋、轮胎串与轮胎碎片复合加筋在汶川波激励下,其加速度放大倍数较未加筋边坡相比,最大减小幅度分别为37.5%、30.0%、21.0%,前者加速度放大倍数减小幅度分别是后两者的1.4倍和2倍;不同加筋方式下,边坡的加速度放大倍数随地震激励水平的提高呈非线性增加,但与未加筋边坡相比,随输入加速度峰值增大而呈现明显的增幅递减趋势;各种加筋土边坡与未加筋边坡加速度放大倍数均沿坡面约1/3高程处随高度增加而逐渐增大,并在靠近边坡顶部位置达到最大值.迁安波产生的加速度响应明显强于其他3种地震波的激励.Abstract: Waste tires and triaxial geogrids can be used as new reinforcement materials in geotechnical engineering, with merits of excellent mechanical performance, economy and environmental friendliness. Shaking table tests were conducted to study the dynamic performances including distribution of acceleration amplification factor under various conditions such as different earthquake waves, peak ground accelerations(PGA)and reinforcement methods.The slope models include unreinforced slope,triaxial geogrid reinforced slope,triaxial geogrid-waste tire composite reinforced slope,waste tire-tire shred composite reinforced slope. The experimental results show that the seismic performance of the reinforced slopes is significantly improved.Compared with unreinforced slopes, the maximum decrease of acceleration magnification for triaxial geogrid reinforced slope is 37.5%, 30.0% for triaxial geogrid-waste tire composite reinforced slope and 21.0% for waste tire-tire shred composite reinforced slope under Wenchuan wave excitation. The average acceleration magnification reduction of triaxial geogrid reinforced slope is 1.4 and 2 times greater than those of the latter two types of the slopes. Acceleration amplification factor of the reinforced slopes increases with the seismic excitation in a nonlinear way. Compared with the unreinforced slopes,the increasing amplitude of acceleration amplification factor decrease with the input of PGA.Along the surface of the slope about 1/3 of the slope elevation,acceleration magnification factor of the reinforced slopes increase gradually with the elevation,and reaches the maximum at the slope top.The acceleration response induced by Qianan wave is significantly stronger than those induced by other three types of seismic excitations.
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SRILATHA N, LATHA G M, PUTTAPPA C G. Effect of frequency on seismic response of reinforced soil slopes in shaking table tests[J]. Geotextiles and Geomembranes, 2013, 36(2): 27-32. SHIBAYAMA S, IZAWA J, TAKAHASHI A, et al. A comparative study between dynamic shake table test and shear box test in a centrifuge[J]. International Journal of Physical Modelling in Geotechnics, 2009, 9(2): 23-31. NOVA-ROESSIG, SITARL, NICHOLAS. Centrifuge model studies of the seismic response of reinforced soil slopes[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2006, 132(3): 380-400. PEREZ A, HOLTZ R D. Seismic response of reinforced steep soil slopes: results of shaking table study[C]//Geotechnical Engineering for Transportation Projects, California: American Society of Civil Engineers, 2004: 1664-1672. LI Lihua, TANG Huiming, XIAO Benlin. Discarded tire implications in reinforced slope[C]//The 4th International Conference on Technology of Architecture and Structure,[S.l.]:Advanced Materials Research, 2012: 1430-1433. YOON Y W, HEO S B, KIM K S. Geotechnical performance of waste tires for soil reinforcement from chamber tests[J]. Geotextiles and Geomembranes, 2008, 26(1): 100-107. 何宁,娄炎,薛慧涛. 震后山体滑坡处理技术[J]. 武汉大学学报,2008,41(增刊1): 14-18. HE Ning, LOU Yan, XUE Huitao. Reinforcement of landslides caused by earthquake[J]. Engineering Journal of Wuhan University, 2008, 41(Sup.1): 14-18. 谭龙金. 浅析废旧轮胎固土植草在土质边坡支护工程中的应用[J]. 贵州工业大学学报:自然科学版,2008,37(5): 243-245. TAN Longjin. Analysis of scrap tires solid soil planting grass in soil slope support projec[J]. Journal Guizhou University of Technology: Natural Science Edtion, 2008, 37(5): 243-245. KEUN S K, YEO W Y, GIL L Y. Pullout behavior of cell-type tires in reinforced soil structures[J]. Journal of Civil Engineering, 2011, 15(7): 1209-1217. 张达德,张家豪. 砂土围压下的废轮胎拉拔试验评估[J]. 岩土力学,2011,32(3): 733-737. ZHANG Dade, ZHANG Jiahao. Experimental research on pullout test of waste tire with sand confinement[J]. Rock and Soil Mechanics, 2011, 32(3): 733-737. EL-EMAM M M, BATHURST R J. Influence of reinforcement parameters on the seismic response of reduced-scale reinforced soil retaining walls[J]. Geotextiles and Geomembranes, 2007, 25(1): 33-49. 王建,姚令侃,陈强. 汶川地震路堤成灾模式及土工格栅加筋变形控制研究[J]. 岩石力学与工程学报,2010,29(增刊): 3387-3393. WANG Jian, YAO Lingkan, CHEN Qiang. Research on failure mode of road embankment in Wenchuan great earthquake and deformation control of geogrid reinforcement [J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(Sup): 3387-3393. 李志勇. 陡坡路堤土工格栅加筋机制与合理铺设参数研究[J]. 岩土力学,2008,29(4): 925-930. LI Zhiyong. Study on reinforced mechanism and laid parameters of steep slope of highway embankment reinforced with geogrids[J]. Rock and Soil Mechanics, 2008, 29(4): 925-930. 王钊,陆士强. 强度和变形参数的变化对土工有限元计算的影响[J]. 岩土力学,2005,26(12): 1892-1894. WANG Zhao, LU Shiqiang. Effects of variation of strength and deformation parameters on calculation results of FEM for soil engineering[J]. Rock and Soil Mechanics, 2005, 26(12): 1892-1894. 刘小生,王钟宁,汪小刚,等. 面板坝大型振动台模型试验与动力分析[M]. 北京:中国水利水电出版社,2005: 37-46. 杨俊杰. 相似理论与结构模型试验[M]. 武汉:武汉理工大学出版社,2005: 48-52. HAZARIKA H, YASUHARA K, KIKUCHI Y,et al. Multifaceted potentials of tire-derived three dimensiona lgeosynthetics in geotechnical application and evaluation[J]. Geotextiles and Geomembranes, 2010, 28(3): 303-315. 李丽华,肖衡林,唐辉明,等. 轮胎碎片-砂混合土抗剪性能优化试验研究[J]. 岩土力学,2013,34(4): 79-83. LI Lihua, XIAO Henglin, TANG Huiming, et al. Shear performance optimizing of tire shred-sand mixture[J]. Rock and Soil Mechanics, 2013, 34(4): 79-83.
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