循环荷载作用下考虑颗粒破碎的堆石体本构模型
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摘要
中国西部兴建的很多200～300 m高的堆石坝处于高烈度地震区。应力水平高时堆石体的颗粒破碎对其在循环荷载作用下的应力、应变特性有重要的影响。基于广义塑性理论,通过引入状态参数,建立了循环荷载作用下考虑颗粒破碎的堆石体的本构模型,并给出了模型参数的确定方法。与堆石体在400、800、1 500、2 200 kPa围压作用时的试验结果对比,表明所提出的本构模型可以较好地模拟循环荷载作用下颗粒破碎时堆石体的动应力和动应变响应。
There are many 200-300 m high rockfill dams constructed in high earthquake areas located in western areas of China.The grain crushing of rockfill materials with high stress level has significant influence on the stress-strain properties under cyclic loading.Based on the theory of generalized plasticity,and by introducing state parameters,a new dynamic constitutive model for rockfill materials is formulated;and the determination of model parameters is provided as well.Finally the constitutive model is used to model the test results of rockfill materials at 400,800,1 500,2 200 kPa consolidated pressures respectively,which verifies that the proposed constitutive model can simulate well the dynamic stress and dynamic strain responses of rockfill materials under cyclic loading considering grain crushing.
There are many 200-300 m high rockfill dams constructed in high earthquake areas located in western areas of China.The grain crushing of rockfill materials with high stress level has significant influence on the stress-strain properties under cyclic loading.Based on the theory of generalized plasticity,and by introducing state parameters,a new dynamic constitutive model for rockfill materials is formulated;and the determination of model parameters is provided as well.Finally the constitutive model is used to model the test results of rockfill materials at 400,800,1 500,2 200 kPa consolidated pressures respectively,which verifies that the proposed constitutive model can simulate well the dynamic stress and dynamic strain responses of rockfill materials under cyclic loading considering grain crushing.
引文
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[2]NAKATA Y,HYDE A F L,HYODO M,et al.Aprobabilistic approach to sand particle crushing in thetriaxial test[J].Geotechnique,1999,49(5):567-583.
[3]COOP M R,SORENSEN K K,FREITAS T B,et al.Particle breakage during shearing of a carbonate sand[J].Geotechnique,2004,54(3):157-163.
[4]YASUDA N,MATSUMOTO N,YOSHIOKA R,et al.Undrained monotonic and cyclic strength of compactedrockfill material from triaxial and torsional simple sheartests[J].Canadian Geotechnical Journal,1997,34(3):357-367.
[5]沈珠江,徐刚.堆石料的动力变形特性[J].水利水运科学研究,1996,(2):143-150.SHEN Zhu-jiang,XU Gang.Dynamic deformationalproperties of rockfill materials[J].Hydro-Science andEngineering,1996,(2):143-150.
[6]陈生水,沈珠江,丽能惠.复杂应力路径下无黏性土的弹塑性数值模拟[J].岩土工程学报,1995,17(2):20-28.CHEN Sheng-shui,SHEN Zhu-jiang,LI Neng-hui.Anelasto-plastic model for cohesionless soils under complexstress paths[J].Chinese Journal of GeotechnicalEngineering,1995,17(2):20-28.
[7]SHEN Zhu-jiang.A granular medium model forliquefaction analysis of sands[J].Chinese Journal ofGeotechnical Engineering,1999,21(6):742-748.沈珠江.砂土液化分析的散粒体模型[J].岩土工程学报,1999,21(6):742-748.
[8]DAFALIAS Y F.Bounding surface plasticity I:Mathematical foundation and hypoplasticity[J].Journalof Engineering Mechanics,ASCE,1986,112(9):966-987.
[9]WANG Z L,DAFALIAS Y F,SHEN C K.Boundingsurface hypoplasticity model for sand[J].Journal ofEngineering Mechanics,ASCE,1990,116(5):983-1001.
[10]吴兴征,栾茂田,李相崧.复杂加载路径下堆石料动力本构模型及数值模拟[J].世界地震工程,2001,17(1):9-14.WU Xing-zheng,LUAN Mao-tian,LI Xiang-song.Bounding surface hypoplastic model for rockfill materialsunder complex loading paths and its verification[J].World Information on Earthquake Engineering,2001,17(1):9-14.
[11]PASTOR M,ZIENKIEWICZ O C,CHAN A H C.Generalized plasticity and the modeling of soilbehavior[J].International Journal for Numerical andAnalytical Methods in Geomechanics,1990,14(3):151-190.
[12]LING H I,YANG S.Unified sand model based on thecritical state and generalized plasticity[J].Journal ofEngineering Mechanics,ASCE,2006,132(12):1380-1391.
[13]LI X S,DAFALIAS Y F.Dilatancy for cohesionlesssoils[J].Geotechnique,2000,52(3):173-186.
[14]周成,沈珠江,陈生水,等.次塑性模型及饱和砂土动力弹塑性响应分析[J].岩土力学,2004,25(4):549-554.ZHOU Cheng,SHEN Zhu-jiang,CHEN Sheng-shui,et al.Hypoplasticity model and analysis of dynamicelastoplastic response of saturated sand[J].Rock and SoilMechanics,2004,25(4):549-554.
[15]刘恩龙,陈生水,李国英,等.堆石料的临界状态与考虑颗粒破碎的本构模型[J].岩土力学,2011,32(增刊2):148-154.LIU En-long,CHEN Sheng-shui,LI Guo-ying,et al.Critical state of rockfill materials and a constitutive modelincorporating grain crushing[J].Rock and SoilMechanics,2011,32(Supp.2):148-154.
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