轨道交通振动下南京片状细砂的有效应力路径及破坏模式
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摘要
以南京片状结构细砂为研究对象,采用英国WFI动静多功能三轴仪,研究了饱和南京片状结构细砂在列车振动荷载作用下静偏应力水平、循环应力比对其动力特性的影响;把振动孔压的发展与应力路径相联系,分析了循环荷载作用下不同阶段南京片状结构细砂所处的初始压密状态、压缩状态和膨胀状态的发生和发展过程;同时,根据静偏应力与循环偏应力的大小,视有无偏应力反向,南京片状结构细砂的破坏模式可分为循环活动性和塑性应变累积破坏,并对其循环活动性的机制进行了初步探讨。
A series of dynamic behavior tests on Nanjing fine sand with flake-shaped structure are performed by using WFI cyclic triaxial apparatus made in England.The dynamic behaviors of Nanjing fine sand with flake-shaped structure under different static deviator stresses and cyclic stress ratios are studied.Through comparing the effective stress path under cyclic loading with static loading,the process of liquefaction of saturated flake-shaped structural Nangjing fine sand with the development of pore-water pressure,including initial compact state,compression state and dilative state,are investigated.In addition,according to different combinations of static deviator stresses and cyclic stresses,two kinds of failure patterns with deviator stress reversal or without deviator stress reversal are observed including cyclic mobility and failure of accumulation residual strain;and the mechanism of the cyclic mobility is investigated preliminarily.
A series of dynamic behavior tests on Nanjing fine sand with flake-shaped structure are performed by using WFI cyclic triaxial apparatus made in England.The dynamic behaviors of Nanjing fine sand with flake-shaped structure under different static deviator stresses and cyclic stress ratios are studied.Through comparing the effective stress path under cyclic loading with static loading,the process of liquefaction of saturated flake-shaped structural Nangjing fine sand with the development of pore-water pressure,including initial compact state,compression state and dilative state,are investigated.In addition,according to different combinations of static deviator stresses and cyclic stresses,two kinds of failure patterns with deviator stress reversal or without deviator stress reversal are observed including cyclic mobility and failure of accumulation residual strain;and the mechanism of the cyclic mobility is investigated preliminarily.
引文
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[12]刘颖,谢君斐.砂土震动液化[M].北京:地震出版社,1984.
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[2]MADSHUS C,KAYNIA A M.High-speed railway lines on soft ground:Dynamic behavior at critical train speed[J].Journal of Sound and Vibration,2000,231(3):689-701.
[3]王常晶,陈云敏.列车荷载在地基中引起的应力响应分析[J].岩石力学与工程学报,2005,24(7):1178-1186.WANG Chang-jing,CHEN Yun-min.Analysis of stresses in train-induced ground[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(7):1178-1186.
[4]黄茂松,李进军,李兴照.饱和软黏土的不排水循环累积变形特性[J].岩土工程学报,2006,28(7):891-895.HUANG Mao-song,LI Jin-jun,LI Xing-zhao.Cumulative deformation behaviour of soft clay in cyclic undrained tests[J].Chinese Journal of Geotechnical Engineering,2006,28(7):891-895.
[5]王常晶,陈云敏.交通荷载引起的静偏应力对饱和软黏土不排水循环性状影响的试验研究[J].岩土工程学报,2007,29(11):1742-1747.WANG Chang-jing,CHEN Yun-min.Study on effect of traffic loading induced static deviator stress on undrained cyclic properties of saturated soft clay[J].Chinese Journal of Geotechnical Engineering,2007,29(11):1742-1747.
[6]蔡袁强,王军,徐长节.初始偏应力作用对萧山软黏土动弹模量与阻尼影响试验研究[J].岩土力学,2007,28(11):2291-2302.CAI Yuan-qiang,WANG Jun,XU Chang-jie.Experimental study on dynamic elastic modulus and damping ratio of Xiaoshan saturated soft clay considering initial deviator stress[J].Rock and Soil Mechanics,200728(11):2291-2302.
[7]周镜.南京砂的工程性质——南京长江大桥加固技术总结[M].北京:中国铁道出版社,1999.
[8]陈文化,孙谋,刘明丽,等.南京砂的结构特性与地铁地基液化判别[J].岩土力学,2003,24(5):755-758.CHEN Wen-hua,SUN Mou,LIU Ming-li,et al.Characters of schistose structure of Nanjing's sand and seismic liquefaction of subsoil of a metro section[J].Rock and Soil Mechanics,2003,24(5):755-758.
[9]陈国兴,刘雪珠.南京及邻近地区新近沉积土的动剪切模量和阻尼比的试验研究[J].岩石力学与工程学报,2004,23(8):1403-1410.CHEN Guo-xing,LIU Xue-zhu.Testing study on ratio of dynamic shear moduli and ratio of damping for deposited soils in Nanjing and its neighboring areas[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(8):1403-1410.
[10]程建军,严三保,蒋建平,等.南京地铁南北线主要工程地质问题认识与评价[J].地球科学与环境学报,2004,26(1):46-51.CHENG Jian-jun,YAN San-bao,JIANG Jian-ping,et al.Assessment on the main engineering geological problems in the south-north line of Nanjing metro[J].Journal of Earth Sciences and Environment,2004,26(1):46-51.
[11]CHEN Y M,WANG C J,CHEN Y P,et al.Characteristics of stresses and settlement of ground induced by train[C]//Proceedings of Environmental Vibration Prediction,Monitoring and Evaluation.Okayama:[s.n.],2005:33-42.
[12]刘颖,谢君斐.砂土震动液化[M].北京:地震出版社,1984.
[13]汪闻韶.土体液化与极限平衡和破坏的区别和关系[J].岩土工程学报,2005,27(1):1-10.WANG Wen-shao.Distinction and interrelation between liquefaction,state of limit equilibrium and failure of soil mass[J].Chinese Journal of Geotechnical Engineering,2005,27(1):1-10.
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