柔性网面土工格栅加筋土挡墙工程特性
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摘要
为研究柔性网面土工格栅加筋土挡墙的工程特性,分析其工作机理,进行室内试验。试验测试墙背侧向土压力、垂直土压力、筋带变形以及面墙变形情况,研究挡墙侧向土压力和垂直土压力分布、筋带应变分布、挡墙潜在破裂面以及面墙变形规律等。研究结果表明:侧向土压力沿墙高呈非线性分布,每层的侧向土压力随施加荷载增大而呈线性增大,但其增大速率远小于理论值增大速率;增大加卸载循环次数也会使得残余侧向土压力增大;垂直土压力沿筋材长度方向呈均匀分布,挡墙第1层的垂直土压力略小于理论值;施加荷载会使得拉筋应变分布发生变化,筋带在试验荷载作用下可以满足强度要求;由广义库仑法得到的潜在破裂面与筋材最大应变位置较吻合;面墙最大侧向变形发生在第3层和第4层,面墙中间位置有鼓出现象。
Based on the laboratory test,engineering behaviors of geogrid reinforced earth retaining wall were studied.Lateral and vertical earth pressure,deformation of reinforcement and wall face were tested.The distributions of vertical and lateral earth pressure,the strain of reinforcement and the lateral deformation behavior of wall face were analyzed.The results show that lateral earth pressure distributes non-linearly along wall back.Lateral earth pressure in each layer increases linearly with the increase of the imposed load,but the increasing rate is smaller than that of the theoretical value.Cycles of load and unload make residual lateral earth pressure increase.Vertical earth pressure shows uniform distribution along reinforcement,and it is smaller than theoretical value in the first layer of retaining wall.With the increase of imposed load,the distribution of strain along the reinforcement changes,and the reinforcement can meet strength requirement under test load.The potential failure surface of retaining wall determined by generalized Coulomb theory is quite consistent with the position of maximum strain of reinforcements.The maximum lateral deformation of wall face occurs in the third layer and the fourth layer of retaining wall,which leads to bulging phenomenon in the middle of wall face.
Based on the laboratory test,engineering behaviors of geogrid reinforced earth retaining wall were studied.Lateral and vertical earth pressure,deformation of reinforcement and wall face were tested.The distributions of vertical and lateral earth pressure,the strain of reinforcement and the lateral deformation behavior of wall face were analyzed.The results show that lateral earth pressure distributes non-linearly along wall back.Lateral earth pressure in each layer increases linearly with the increase of the imposed load,but the increasing rate is smaller than that of the theoretical value.Cycles of load and unload make residual lateral earth pressure increase.Vertical earth pressure shows uniform distribution along reinforcement,and it is smaller than theoretical value in the first layer of retaining wall.With the increase of imposed load,the distribution of strain along the reinforcement changes,and the reinforcement can meet strength requirement under test load.The potential failure surface of retaining wall determined by generalized Coulomb theory is quite consistent with the position of maximum strain of reinforcements.The maximum lateral deformation of wall face occurs in the third layer and the fourth layer of retaining wall,which leads to bulging phenomenon in the middle of wall face.
引文
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[16]林宇亮,杨果林,李昀,等.绿色加筋格宾挡墙工程特性试验研究[J].岩土力学,2010,31(10):3113-3119.LIN Yuliang,YANG Guolin,LI Yun,et al.Test study of engineering properties of green reinforced gabion retaining wall[J].Rock and Soil Mechanics,2010,31(10):3113-3119.
[17]LIN Yuliang,YANG Guolin,LI Yun,et al.Dynamic deformation behavior of geogrid reinforced retaining wall of flexible surface and dynamic analysis[C]//Proceedings of4th International Symposium on Environmental Vibration.Beijing:Science Press,2009:481-486.
[18]杨果林,王永和.土工合成材料在加卸循环荷载作用下的应力应变特性研究[J].铁道学报,2002,24(3):74-77.YANG Guolin,WANG Yonghe.Study on stress-strain relationship of geosynthetics under cyclic loaded-unloaded[J].Journal of the China Railway Society,2002,24(3):74-77.
[19]周世良,何光春,汪承志,等.台阶式加筋土挡墙模型试验研究[J].岩土工程学报,2007,29(1):152-156.ZHOU Shiliang,HE Guangchun,WANG Chengzhi,et al.Study on stepped reinforced soil retaining walls by model tests[J].Chinese Journal of Geotechnical Engineering,2007,29(1):152-156.
[20]张孟喜,孙遇祺,李国祥.加筋土挡墙工作机理的室内试验研究[J].铁道学报,1999,21(5):79-82.ZHANG Mengxi,SUN Yuqi,LI Guoxiang.Experimental study of the fundamental mechanism of reinforced earth retaining walls[J].Journal of the China Railway Society,1999,21(5):79-82.
[2]阙云,凌建明,袁燕.加筋土路堤稳定的极限分析[J].同济大学学报:自然科学版,2008,36(8):1079-1084.QUE Yun,LING Jianming,YUAN Yan.Limit analysis of reinforced embankment stability[J].Journal of Tongji University:Natural Science,2008,36(8):1079-1084.
[3]He S,Li J.Modeling nonlinear elastic behavior of reinforced soil using artificial neural networks[J].Applied Soft Computing,2009,9(3):954-961.
[4]Hattamleh O A,Muhunthan B.Numerical procedures for deformation calculations in the reinforced soil walls[J].Geotextiles and Geomembranes,2006,24(1):52-57.
[5]何光春,汪承志,刘波.加筋土护岸挡墙的黏弹塑性有限元分析[J].岩土工程学报,2008,30(6):911-917.HE Guangchun,WANG Chengzhi,LIU Bo.Reinforced earth retaining walls by FEM based on visco-elasto-plasticity[J].Chinese Journal of Geotechnical Engineering,2008,30(6):911-917.
[6]林宇亮,杨果林,李昀,等.加筋土筋材在拉伸荷载作用下的力学特性[J].中国铁道科学,2009,30(5):9-14.LIN Yuliang,YANG Guolin,LI Yun,et al.The mechanical characteristics of the reinforcements under tensile load[J].ChinaRailway Science,2009,30(5):9-14.
[7]林宇亮,杨果林,刘冬.加筋土筋材拉伸力学特性与模型分析[J].中南大学学报:自然科学版,2011,42(7):2138-2146.LIN Yuliang,YANG Guolin,LIU Dong.Tensile mechanical behaviors of reinforcements and model analysis[J].Journal of Central South University:Science and Technology,2011,42(7):2138-2146.
[8]Zhang M X,Zhou H,Javadi A A,et al.Experimental and theoretical investigation of strength of soil reinforced with multi-layer horizontal-vertical orthogonal elements[J].Geotextiles and Geomembranes,2008,26(1):1-13.
[9]林宇亮,杨果林,李昀,等.加筋格宾挡墙在重复荷载作用下动变形特性试验研究[J].岩石力学与工程学报,2009,28(增刊2):4027-4033.LIN Yuliang,YANG Guolin,LI Yun,et al.Test study on dynamic deformation behavior of reinforced gabion retaining wall under cyclic load[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(S2):4027-4033.
[10]杨果林,林宇亮,李昀.新型加筋土挡墙动变形特性试验研究[J].振动与冲击,2010,29(1):223-227.YANG Guolin,LIN Yuliang,LI Yun.Test study on dynamic deformation behavior of new reinforced earth retaining walls[J].Journal of Vibration and Shock,2010,29(1):223-227.
[11]李昀,杨果林,林宇亮.水平地震作用下绿色加筋格宾挡土墙动力特性试验研究[J].中南大学学报:自然科学版,2010,41(1):347-352.LI Yun,YANG Guolin,LIN Yuliang.Dynamic characteristics of green reinforced gabion walls subjected to horizontal seismic loading[J].Journal of Central South University:Science and Technology,2010,41(1):347-352.
[12]Latha G M,Krishna A M.Seismic response of reinforced soil retaining wall models:Influence of backfill relative density[J].Geotextiles and Geomembranes,2008,26(4):335-349.
[13]王祥,周顺华,顾湘生,等.路堤式加筋土挡墙的试验研究[J].土木工程学报,2005,38(10):119-124.WANG Xiang,ZHOU Shunhua,GU Xiangsheng,et al.Anexperimental study on the reinforced retaining wall for embankment[J].China Civil Engineering Journal,2005,38(10):119-124.
[14]杨广庆,吕鹏,庞巍,等.返包式土工格栅加筋土高挡墙现场试验研究[J].岩土力学,2008,29(2):517-522.YANG Guangqing,LüPeng,PANG Wei,et al.Research on geogrid reinforced soil retaining wall with wrapped face by in-situ tests[J].Rock and Soil Mechanics,2008,29(2):517-522.
[15]LIN Yuliang,YANG Guolin,LI Yun,et al.Engineering behaviors of reinforced gabion retaining wall based on laboratory test[J].Journal of Central South University of Technology,2010,17(6):1351-1356.
[16]林宇亮,杨果林,李昀,等.绿色加筋格宾挡墙工程特性试验研究[J].岩土力学,2010,31(10):3113-3119.LIN Yuliang,YANG Guolin,LI Yun,et al.Test study of engineering properties of green reinforced gabion retaining wall[J].Rock and Soil Mechanics,2010,31(10):3113-3119.
[17]LIN Yuliang,YANG Guolin,LI Yun,et al.Dynamic deformation behavior of geogrid reinforced retaining wall of flexible surface and dynamic analysis[C]//Proceedings of4th International Symposium on Environmental Vibration.Beijing:Science Press,2009:481-486.
[18]杨果林,王永和.土工合成材料在加卸循环荷载作用下的应力应变特性研究[J].铁道学报,2002,24(3):74-77.YANG Guolin,WANG Yonghe.Study on stress-strain relationship of geosynthetics under cyclic loaded-unloaded[J].Journal of the China Railway Society,2002,24(3):74-77.
[19]周世良,何光春,汪承志,等.台阶式加筋土挡墙模型试验研究[J].岩土工程学报,2007,29(1):152-156.ZHOU Shiliang,HE Guangchun,WANG Chengzhi,et al.Study on stepped reinforced soil retaining walls by model tests[J].Chinese Journal of Geotechnical Engineering,2007,29(1):152-156.
[20]张孟喜,孙遇祺,李国祥.加筋土挡墙工作机理的室内试验研究[J].铁道学报,1999,21(5):79-82.ZHANG Mengxi,SUN Yuqi,LI Guoxiang.Experimental study of the fundamental mechanism of reinforced earth retaining walls[J].Journal of the China Railway Society,1999,21(5):79-82.
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