袋内材料对土工袋动力特性参数影响的试验研究
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摘要
土工袋加固地基技术已普遍应用于房屋地基、边坡加固等工程中。大量研究表明,土工袋具有显著的减振消能效果。为了进一步探讨不同的袋内充填土体材料对土工袋减振消能效果的影响,通过对不同粒径、级配、黏粒含量的填充土体材料及装有相应填充土体材料的土工袋进行水平循环剪切试验,研究袋内填充土体材料与动剪切模量及等效阻尼比2个参数的关系。试验结果表明,土体装入土工袋后,动剪切模量降低,等效阻尼比增大;当填充土体材料及土工袋内土体材料粒径相对较小、级配均匀、黏粒含量高时,等效阻尼比和动剪切模量较大。总体而言,粒径和级配对土工袋减振消能效果影响不大。
Soil-bags are a new earth reinforcement method and have been widely used in many projects including building foundations and slope reinforcement. A large number of researches on soil-bags show that soil-bags have significant vibration energy absorption effect. This paper investigates the effects of different soil fills in bags on vibration energy absorption. Cyclic simple shear tests are carried out on soil-bags filled with different soils and on soil-bags filled with soils that have different particle sizes, gradations and clay contents. The dynamic shear modulus and the equivalent damping ratios of the soil-bags and fill soils are analyzed. The test results show that the dynamic shear modulus of soil-bags are smaller and the equivalent damping ratios of soil-bags are higher than the fill soils. The dynamic shear modulus and equivalent damping of both the fill soils and the soil-bags are relatively higher in the cases that particle sizes of the fill soils are smaller, gradations are uniform and clay contents are larger. In general, the effects of the particle sizes and gradations of the fill soils are not pronounced on the equivalent damping ratios.
Soil-bags are a new earth reinforcement method and have been widely used in many projects including building foundations and slope reinforcement. A large number of researches on soil-bags show that soil-bags have significant vibration energy absorption effect. This paper investigates the effects of different soil fills in bags on vibration energy absorption. Cyclic simple shear tests are carried out on soil-bags filled with different soils and on soil-bags filled with soils that have different particle sizes, gradations and clay contents. The dynamic shear modulus and the equivalent damping ratios of the soil-bags and fill soils are analyzed. The test results show that the dynamic shear modulus of soil-bags are smaller and the equivalent damping ratios of soil-bags are higher than the fill soils. The dynamic shear modulus and equivalent damping of both the fill soils and the soil-bags are relatively higher in the cases that particle sizes of the fill soils are smaller, gradations are uniform and clay contents are larger. In general, the effects of the particle sizes and gradations of the fill soils are not pronounced on the equivalent damping ratios.
引文
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[15]李红军,迟世春,钟红,等.考虑土料动力特性参数围压依赖性的高土石坝动力反应分析[J].水利学报,2007,38(8):938-943.LI Hong-jun,CHI Shi-chun,ZHONG Hong,et al.Dynamic response analysis for high rockfill dam considering the dependency of material dynamic properties on confining pressure[J].Journal of Hydraulic Engineering,2007,38(8):938-943.
[2]周福霖.工程结构减振控制[M].北京:地震出版社,1997.
[3]MATSUOKA H,LIU SIHONG.A new earth reinforcement method using soilbags[M].London:Taylor&Francis Group,2006:55-61.
[4]刘斯宏,汪易森.土工袋加固地基原理及其工程应用[J].岩土工程技术,2007,21(5):221-225.LIU Si-hong,WANG Yi-shen.Reinforcement mechanism of soilbags and its applications[J].Geotechnical Engineering Technique,2007,21(5):221-225.
[5]刘斯宏,松冈元.土工袋加固地基新技术[J].岩土力学,2007,28(8):1665-1670.LIU Si-hong,MATSUOKA Hajime.A new earth reinforcement method by soilbags[J].Rock and Soil Mechanics,2007,28(8):1665-1670.
[6]LIU SIHONG,GAO JUNJUN,WANG YANXIAO,et al.Experimental study on vibration reduction by using soilbagas[J].Geotextiles and Geomembrances,2014(in press),http://dx.doi.org/10.1016/j.geotexmem.2013.12.007.
[7]刘斯宏,汪易森.土工袋技术及其应用前景[J].水利学报,2007,38(增刊1):644-648.LIU Si-hong,WANG Yi-shen.Reinforcement mechanism of soilbags and its applications[J].Journal of Hydraulic Engineering,2007,38(Supp.1):644-648.
[8]刘斯宏,高军军,王子健,等.土工袋技术在市政沟槽回填中的应用研究[J].岩土力学,2014,35(3):765-771.LIU Si-hong,GAO Jun-jun,WANG Zi-jian,et al.Application of soilbags to urban trench backfill[J].Rock and Soil Mechanics,2014,35(3):765-771.
[9]刘斯宏,王艳巧,金远征.土工袋基础减振隔震试验[J].水利水电科技进展,2012,32(1):87-90.LIU Si-hong,WANG Yan-qiao,JIN Yuan-zheng.Experimental study on vibration reduction and isolation of bases with soilbags[J].Advances in Science and Technology of Water Resources,2012,32(1):87-90.
[10]王艳巧,刘斯宏,林圣德,等.土工袋减振效果振动台试验[J].水电能源科学,2011,29(9):100-102.WANG Yan-qiao,LIU Si-hong,LIN Sheng-de,et al.Vibrating platform test study of vibration reduction effect of soil bag[J].Water Resources and Power,2011,29(9):100-102.
[11]王艳巧,刘斯宏,李亚军,等.土工袋竖向减振特性试验研究[J].水电能源科学,2011,29(6):113-115.WANG Yan-qiao,LIU Si-hong,LI Ya-jun,et al.Experimental study on vertical damping effect of soilbags[J].Water Resources and Power,2011,29(6):113-115.
[12]王艳巧,王丽娟.土工袋减振与耗能的数值模拟[J].岩土力学,2014,35(2):601-606.WANG Yan-qiao,WANG Li-juan.Numerical simulation of vibration reduction and energy dissipation of soilbags[J].Rock and Soil Mechanics,2014,35(2):601-606.
[13]徐超,陈洪帅,石志龙,等.筋-土界面力学特性的水平循环剪切试验研究[J].岩土力学,2013,34(6):1553-1559.XU Chao,CHEN Hong-shuai,SHI Zhi-long,et al.Research on the mechanical behavior of soilreinforcement interface by horizontal cyclic shear test[J].Rock and Soil Mechanics,2013,34(6):1553-1559.
[14]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,1996.
[15]李红军,迟世春,钟红,等.考虑土料动力特性参数围压依赖性的高土石坝动力反应分析[J].水利学报,2007,38(8):938-943.LI Hong-jun,CHI Shi-chun,ZHONG Hong,et al.Dynamic response analysis for high rockfill dam considering the dependency of material dynamic properties on confining pressure[J].Journal of Hydraulic Engineering,2007,38(8):938-943.
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