双向土工格栅加筋碎石桩单轴压缩试验
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摘要
对拉伸塑料、焊接聚酯和经编涤纶等3种双向土工格栅加筋碎石桩桩体进行单轴压缩试验,以研究不同双向土工格栅加筋碎石桩桩体的变形和强度特性。研究结果表明:拉伸塑料和经编涤纶格栅加筋碎石桩桩体强度与筋材强度之间呈较好的线性关系,而焊接聚酯格栅加筋碎石桩桩体强度与筋材强度之间的线性关系较差;拉伸塑料格栅加筋碎石桩桩体破坏时其格栅本身拉伸强度能充分发挥,而焊接聚酯格栅和经编涤纶格栅加筋碎石桩桩体,均在这两种格栅远未达到其本身拉伸强度前,因格栅焊接点脱开或横肋从纵肋中抽离而导致破坏,拉伸塑料格栅加筋碎石桩桩体强度要显著高于经编涤纶和焊接聚酯格栅加筋碎石桩桩体强度;在实际工程中可采用双向拉伸塑料格栅来加筋碎石桩桩体,其桩体强度可采用聚丙烯土工编织布加筋碎石桩桩体强度修正公式计算。
In this paper,stone columns are encased with three types of biaxial geogrid such as stretch plastic geogrid,welded polyester geogrid and knitted polyester geogrid. Uniaxial compression tests are conducted on the geogrid-encased stone columns to study their deformation and strength characteristics. The results show that there are good linear relationships between column strength and encasement strength both in stretch plastic geogrid and knitted polyester geogrid encased columns,while the linear relationship is not good in welded polyester geogrid encased columns. Stretch plastic geogrid encased column is damaged when the strength of geogrid reaches,while welded polyester and knitted polyester encased columns are damaged due to the breakage of welding or knitting nodes when the strength of geogrid are far from reaching. Therefore,the strength of stretch plastic geogrid encased column is significantly higher than that of welded polyester geogrid and knitted polyester geogrid encased columns.In practical engineering,stretch plastic geogrid is recommended for encasing the stone columns,and the strength ofplastic geogrid-encased stone columns can be calculated by using a corrected theoretic formula for polypropylene geotextile encased stone columns.
In this paper,stone columns are encased with three types of biaxial geogrid such as stretch plastic geogrid,welded polyester geogrid and knitted polyester geogrid. Uniaxial compression tests are conducted on the geogrid-encased stone columns to study their deformation and strength characteristics. The results show that there are good linear relationships between column strength and encasement strength both in stretch plastic geogrid and knitted polyester geogrid encased columns,while the linear relationship is not good in welded polyester geogrid encased columns. Stretch plastic geogrid encased column is damaged when the strength of geogrid reaches,while welded polyester and knitted polyester encased columns are damaged due to the breakage of welding or knitting nodes when the strength of geogrid are far from reaching. Therefore,the strength of stretch plastic geogrid encased column is significantly higher than that of welded polyester geogrid and knitted polyester geogrid encased columns.In practical engineering,stretch plastic geogrid is recommended for encasing the stone columns,and the strength ofplastic geogrid-encased stone columns can be calculated by using a corrected theoretic formula for polypropylene geotextile encased stone columns.
引文
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Yang F O,Zhang J J,Liao W M,et al.2017.Characteristics of the stress and deformation of geosynthetic-encased stone column composite ground based on large-scale model tests[J].Geosynthetics International,24(3):1-13.
Yang G Q,Xu C,Zhang M X.2016.Geosynthetics reinforcement soil structure application guidance[M].Beijing:China Communications Press.
Zhang L,Zhao M H,Shi C J,et al.2013.Settlement Calculation of Composite Foundation Reinforced with Stone Columns[J].International Journal of Geomechanics,13(3):248-256.
陈继彬,赵其华,彭社琴.2015.路堤荷载下碎石桩处理软基沉降计算[J].工程地质学报,23(3):505-510.
董彦莉.2011.土工格栅加筋砂土的特性研究及加筋垫层的承载力计算[D].山西:太原理工大学.
郭彪,龚晓南,李亚军.2016.考虑加载过程及桩体固结变形的碎石桩复合地基固结解析解[J].工程地质学报,24(3):409-417.
宋焱勋,王治军,李喜安,等.2011.毛乌素沙漠风积砂地层碎石桩载荷试验研究[J].工程地质学报,19(4):601-605.
杨广庆,徐超,张孟喜.2016.土工合成材料加筋土结构应用技术指南[M].北京:人民交通出版社.
中华人民共和国行业标准编写组.2006.公路工程土工合成材料试验规程(JTG E50-2006)[S].北京:人民交通出版社.
中华人民共和国行业标准编写组.2007.公路土工试验规程(JTGE40-2007)[S].北京:人民交通出版社.
中华人民共和国行业标准编写组.2014.土工合成材料应用技术规范(GB/T 50290-2014)[S].北京:中国计划出版社.
Chen J F,Li L Y,Xue J F,et al.2015.Failure mechanism o geosynthetic-encased stone columns in soft soils under embankment[J].Geotextiles&Geomembranes,43(5):424-431.
Chen J F,Wang X T,Xue J F,et al.2018.Uniaxial compression behavior of geotextile encased stone columns[J].Geotextiles&Geomembranes,46(3):277-283.
Chen J B,Zhao Q H,Peng S Q.2015.Settlement evaluation of soft soil foundation reinforced with stone column due to embankment load[J].Journal of Engineering Geology,23(3):505-510.
Dash S K,Bora M C.2013.Influence of geosynthetic encasement on the performance of stone columns floating in soft clay[J].Canadian Geotechnical Journal,50(7):754-765.
Dong Y L.2011.Analysis on characterics of geogrid reinforced sand and bearing capacity of geosynthetics reinforced cushion[D].Shanxi:Taiyuan University of Technology.
Elsawy M B D.2013.Behaviour of soft ground improved by conventional and geogrid-encased stone columns,based on FEM study[J].Geosynthetics International,20(4):276-285.
Gniel J,Bouazza A.2009.Improvement of soft soils using geogrid encased stone columns[J].Geotextiles&Geomembranes,27(3):167-175.
Guo B,Gong X N,Li Y J.2016.Analytical solution for consolidation of stone column-reinforced foundations taking into account consolidation deformation of pile under progressive loading[J].Journal of Engineering Geology,24(3):409-417.
Hughes J M O,Withers N J,Greenwood D A.1975.A field trial of the reinforcing effect of a stone column in soil[J].Géotechnique,25(1):31-44.
Mc Kenna J M,Eyre W A,Wolstenholme D R.1975.Performance of an embankment supported by stone columns in soft ground[J].Géotecnique,25(1):51-59.
Poorooshasb H B,Meyerhof G G.1997.Analysis of behavior of stone columns and lime columns[J].Computers&Geotechnics,20(1):47-70.
Raithel M,Kirchner A,Schade C.2005.Foundation of constructions on very soft soils with geotextile encased columns-state of the arc[C]∥Proceedings of Geo Frontiers.Reston,2005:1-11.
Song Y X,Wang Z J,Li X A,et al.2011.Static loading tests on vibrating gravel pile foundation in mu us desert[J].Journal of Engineering Geology,19(4):601-605.
The Professional Standards Compilation Group of People's Republic of China.2006.Test methods of geosynthetics for highway engineering(JTG E50-2006)[S].Beijing:China Communication Press.
The Professional Standards Compilation Group of People's Republic of China.2007.Test methods of soils for highway engineering(JTGE40-2007)[S].Beijing:China Communication Press.
The Professional Standards Compilation Group of People's Republic of China.2014.Technical code for application of geosynthetics(GB/T50290-2014)[S].Beijing:China Planning Press.
Yang F O,Zhang J J,Liao W M,et al.2017.Characteristics of the stress and deformation of geosynthetic-encased stone column composite ground based on large-scale model tests[J].Geosynthetics International,24(3):1-13.
Yang G Q,Xu C,Zhang M X.2016.Geosynthetics reinforcement soil structure application guidance[M].Beijing:China Communications Press.
Zhang L,Zhao M H,Shi C J,et al.2013.Settlement Calculation of Composite Foundation Reinforced with Stone Columns[J].International Journal of Geomechanics,13(3):248-256.
陈继彬,赵其华,彭社琴.2015.路堤荷载下碎石桩处理软基沉降计算[J].工程地质学报,23(3):505-510.
董彦莉.2011.土工格栅加筋砂土的特性研究及加筋垫层的承载力计算[D].山西:太原理工大学.
郭彪,龚晓南,李亚军.2016.考虑加载过程及桩体固结变形的碎石桩复合地基固结解析解[J].工程地质学报,24(3):409-417.
宋焱勋,王治军,李喜安,等.2011.毛乌素沙漠风积砂地层碎石桩载荷试验研究[J].工程地质学报,19(4):601-605.
杨广庆,徐超,张孟喜.2016.土工合成材料加筋土结构应用技术指南[M].北京:人民交通出版社.
中华人民共和国行业标准编写组.2006.公路工程土工合成材料试验规程(JTG E50-2006)[S].北京:人民交通出版社.
中华人民共和国行业标准编写组.2007.公路土工试验规程(JTGE40-2007)[S].北京:人民交通出版社.
中华人民共和国行业标准编写组.2014.土工合成材料应用技术规范(GB/T 50290-2014)[S].北京:中国计划出版社.