竹筋格栅加筋山区挖填路基受力变形研究
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摘要
利用我国西部山区的竹材作为挖填路基的加筋材料,对湘西楠竹筋材的抗拉、抗弯强度进行测试,并与传统加筋材料的力学性能进行比对;基于Pasternak模型对挖填路基进行简化,对竹材加筋挖填路基抗弯变形性能展开研究;利用FLAC3D有限差分软件建立加筋挖填路基三维模型,就加竹筋格栅、加土工格栅及不加筋3种工况下的路基顶面差异沉降进行对比分析。研究结果表明:竹材能满足规范对筋材力学性能的要求;竹筋格栅加筋能有效减少路基顶面差异沉降,且其加筋效果优于土工格栅。研究成果可为控制挖填路基填挖结合部差异沉降提供技术支撑,为挖填路基的设计、施工提供参考。
In order to make use of bamboo as reinforcement material for excavated and filled subgrade in western mountainous areas of China, the tensile and bending strength of phyllostachys pubescens reinforcement in West Hunan was tested and compared with mechanical performance of traditional reinforcement material. Excavated and filled subgrade was simplified based on Pastemak model to study the Bamboo reinforced excavated and filled subgrade bending deformation performance; The reinforced excavated and Filled 3 D model was established based on finite difference software FLAC3 D, the comparison analysis was made for differential sedimentation on the top of subgrade in such three cases as bamboo geogrid, geogrid and no reinforcement was installed on the excavated and filled joint. The result indicates that bamboo geogrid can meet the requirement of existing standard for mechanical performance of reinforcement; bamboo geogrid reinforcement can effectively reduce the differential sedimentation of the subgrade top surface, and the reinforcement effect of bamboo geogrid was superior to that of geogrid. This can provide technical support for controlling differential settlement at the joint of excavation and filling subgrade, and provide important reference for design and construction of excavation and filling subgrade.
In order to make use of bamboo as reinforcement material for excavated and filled subgrade in western mountainous areas of China, the tensile and bending strength of phyllostachys pubescens reinforcement in West Hunan was tested and compared with mechanical performance of traditional reinforcement material. Excavated and filled subgrade was simplified based on Pastemak model to study the Bamboo reinforced excavated and filled subgrade bending deformation performance; The reinforced excavated and Filled 3 D model was established based on finite difference software FLAC3 D, the comparison analysis was made for differential sedimentation on the top of subgrade in such three cases as bamboo geogrid, geogrid and no reinforcement was installed on the excavated and filled joint. The result indicates that bamboo geogrid can meet the requirement of existing standard for mechanical performance of reinforcement; bamboo geogrid reinforcement can effectively reduce the differential sedimentation of the subgrade top surface, and the reinforcement effect of bamboo geogrid was superior to that of geogrid. This can provide technical support for controlling differential settlement at the joint of excavation and filling subgrade, and provide important reference for design and construction of excavation and filling subgrade.
引文
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[7]李广信.从息壤到土工合成材料[J].岩土工程学报,2013, 35(1):144-149.LI Guangxin. From “Xi-rang” to geosynthetics[J].Chinese Journal of Geotechnical Engineering, 2013,35(1):144-149.
[8] LO T Y, CUI H Z, TANG P W C, et al. Strength analysis of bamboo by microscopic investigation of bamboo fibre[J]. Construction&Building Materials, 2008, 22(7):1532-1535.
[9]吴文清,吴忠振,马雪媛,等.竹质复合材料工字形梁的抗弯性能试验[J].中国公路学报, 2014, 27(4):69-78.WU Wenqing, WU Zhongzhen, MA Xueyuan, et al. Test on bending resistance properties of bamboo-based composite I-shaped beam[J]. China Journal of Highway and Transport, 2014, 27(4):69-78.
[10]陈俊,符文熹,戴峰,等.用于填筑路堤加固的竹筋格栅力学性能[J].岩土力学, 2017, 38(1):174-179.CHEN Jun, FU Wenxi, DAI Feng, et al. Mechanical behaviors of bamboo geogrid in reinforcing filling embankment[J]. Rock and Soil, 2017, 38(1):174-179.
[11] Moroz J G, Lissel S L, Hagel M D. Performance of bamboo reinforced concrete masonry shear walls[J].Construction&Building Materials, 2014, 61(3):125-137.
[12]党发宁,刘海伟,王学武.竹子作为抗拉筋材加固软土路堤的应用研究[J].岩土工程学报,2013, 35(增刊2):44-49.DANG Faning, LIU Haiwei, WANG Xuewu. Application of bamboo as tensile reinforcement to strengthening of embankment of soft soils[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(Suppl 2):44-49.
[13]边学成,宋广,陈云敏. Pasternak地基中土工格室加筋体的受力变形分析[J].工程力学, 2012, 29(5):147-155.BIAN Xuecheng, SONG Guang, CHEN Yunmin.Deformation behaviors of geocell reinforcement in pasternak ground[J]. Engineering Mechanics, 2012, 29(5):147-155.
[14] Tanahashi H. Formulas for an infinitely long bernoullieuler beam on the pasternak model[J]. Journal of the Japanese Geotechnical Society, 2004, 44(5):109-118.
[2] WANG Qingbiao, WEN Xiaokang, JIANG Jinquan, et al.Experimental study on performance of multidirectional geogrid and its application in engineering of high slope[J].Journal of Wuhan University of Technology(Materials Science Edition), 2014, 29(4):704-711.
[3] Moraci N, Cardile G. Deformative behaviour of different geogrids embedded in a granular soil under monotonic and cyclic pullout loads[J]. Geotextiles&Geomembranes,2012, 32(3):104-110.
[4]谢永利,俞永华,杨晓华.土工格室在处治路基不均匀沉降中的应用研究[J].中国公路学报, 2004, 17(4):7-10.XIE Yongli, YU Yonghua, YANG Xiaohua. Application study of treating differential settlement of subgrade with geocell[J]. China Journal of Highway and Transport,2004, 17(4):7-10.
[5]宋广,边学成,蒋建群,等.公路加筋路基的变形和承载力分析[J].上海交通大学学报, 2011, 45(5):653-658.SONG Guang, BIAN Xuecheng, JIANG Jianqun, et al.Deformation behaviors and bearing capacity of geosynthetics-reinforced pavement[J]. Journal of Shanghai Jiaotong University, 2011, 45(5):653-658.
[6]卢浩,晏长根,杨晓华,等.麦秆纤维加筋土的抗冲蚀性及其防护效果试验研究[J].铁道科学与工程学报,2017, 14(10):2138-2145.LU Hao, YAN Changgen, YANG Xiaohua, et al.Experimental research on anti-eroding property and protection effect of reinforced soil with straw fibers[J].Journal of Railway Science and Engineering, 2017,14(10):2138-2145.
[7]李广信.从息壤到土工合成材料[J].岩土工程学报,2013, 35(1):144-149.LI Guangxin. From “Xi-rang” to geosynthetics[J].Chinese Journal of Geotechnical Engineering, 2013,35(1):144-149.
[8] LO T Y, CUI H Z, TANG P W C, et al. Strength analysis of bamboo by microscopic investigation of bamboo fibre[J]. Construction&Building Materials, 2008, 22(7):1532-1535.
[9]吴文清,吴忠振,马雪媛,等.竹质复合材料工字形梁的抗弯性能试验[J].中国公路学报, 2014, 27(4):69-78.WU Wenqing, WU Zhongzhen, MA Xueyuan, et al. Test on bending resistance properties of bamboo-based composite I-shaped beam[J]. China Journal of Highway and Transport, 2014, 27(4):69-78.
[10]陈俊,符文熹,戴峰,等.用于填筑路堤加固的竹筋格栅力学性能[J].岩土力学, 2017, 38(1):174-179.CHEN Jun, FU Wenxi, DAI Feng, et al. Mechanical behaviors of bamboo geogrid in reinforcing filling embankment[J]. Rock and Soil, 2017, 38(1):174-179.
[11] Moroz J G, Lissel S L, Hagel M D. Performance of bamboo reinforced concrete masonry shear walls[J].Construction&Building Materials, 2014, 61(3):125-137.
[12]党发宁,刘海伟,王学武.竹子作为抗拉筋材加固软土路堤的应用研究[J].岩土工程学报,2013, 35(增刊2):44-49.DANG Faning, LIU Haiwei, WANG Xuewu. Application of bamboo as tensile reinforcement to strengthening of embankment of soft soils[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(Suppl 2):44-49.
[13]边学成,宋广,陈云敏. Pasternak地基中土工格室加筋体的受力变形分析[J].工程力学, 2012, 29(5):147-155.BIAN Xuecheng, SONG Guang, CHEN Yunmin.Deformation behaviors of geocell reinforcement in pasternak ground[J]. Engineering Mechanics, 2012, 29(5):147-155.
[14] Tanahashi H. Formulas for an infinitely long bernoullieuler beam on the pasternak model[J]. Journal of the Japanese Geotechnical Society, 2004, 44(5):109-118.