膨胀土临界状态强度特性及其模型拟合
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摘要
针对蒙自地区膨胀土,进行了饱和重塑条件下的固结排水(CD)与固结不排水(CU)试验,系统研究了饱和土在不同固结围压σ3、初始干密度ρd、初始含水量ω0、剪切速率υ、排水条件下的应力应变特性。通过对临界状态试验结果的归一化处理,揭示了不同试验方法对同一土样抗剪强度量测差异的内在统一性,得到了重塑饱和膨胀土在固结排水与不排水条件下p'-q-ν空间内的破坏线。利用双曲线模型较好地拟合了弱硬化型应力应变曲线,用指数曲线模型拟合了弱软化型应力应变曲线,为模拟边坡在降雨条件下的抗剪强度变化及构筑物土体处于正常水位时的强度状态等工况提供了技术参数与理论支持。
According to Mengzi expansive soil,consolidated drained tests and undrained tests are carried on under the saturated and remolded condition. The stress-strain characteristics of saturated soil are researched systematically under different consolidation pressure, initial dry density, initial water content, shearing rate and drainage condition. The inherent unity of diversity of shearing strength for the same samples is measured by different experimental methods and is indicated according to the normalization of critical state test results. The failure lines in p'- q- ν space of remolded saturated expansive soil under consolidated drained and undrained condition are attained. The hyperbolic curve model can fit well the inferior hardening stress-strain curve. The exponential curve model can fit the inferior soft stress-strain curve. The test results can provide technical parameters and theoreticalhelp for shearing strength variation of slope during rainfall and strength state of soil structure in normal water level.
According to Mengzi expansive soil,consolidated drained tests and undrained tests are carried on under the saturated and remolded condition. The stress-strain characteristics of saturated soil are researched systematically under different consolidation pressure, initial dry density, initial water content, shearing rate and drainage condition. The inherent unity of diversity of shearing strength for the same samples is measured by different experimental methods and is indicated according to the normalization of critical state test results. The failure lines in p'- q- ν space of remolded saturated expansive soil under consolidated drained and undrained condition are attained. The hyperbolic curve model can fit well the inferior hardening stress-strain curve. The exponential curve model can fit the inferior soft stress-strain curve. The test results can provide technical parameters and theoreticalhelp for shearing strength variation of slope during rainfall and strength state of soil structure in normal water level.
引文
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姚仰平,侯伟.2008.K0超固结土的统一硬化模型[J].岩土工程学报,30(3):316~322.
袁俊平.2003.非饱和膨胀土的裂隙概化模型与边坡稳定研究[博士学位论文][D].南京:河海大学.
Chen W F,Saleeb A F.2005.Constitutive equations for concrete andsoil[M].Beijing:China Architecture&Building Press.
Janbu N.1963.Soil compressibility as determined by oedometer andtriaxial tests[A]//Proceedings of European Conference on SoilMechanics and Foundation Engineering[C].Wiesbaden,1:19~25.
Li Z Q.2008.Research on mechanical characteristic of unsaturatedexpansive soil and its engineering treatment[Doctorate Thesis][D].Beijing:Graduate University of Chinese Academy of Sciences.
Li Z Q,Li T,Hu R L,et al.2008.Expansion characteristics andconstruction control of remolded Mengzi expansive soil[J].ChineseJournal of Geotechnical Engineering,30(12):1855~1860.
Liu Y X,Shi J Y.2003.Improvement of modified Cam-Clay modelbased on transformation of stress space[J].Rock and SoilMechanics,24(1):1~7.
Miao L C.1999.Research on deformation and strength of unsaturatedexpansive soil[Doctorate Thesis][D].Nanjing:Hohai University.
Parry R H G.1960.Triaxial compression and extension tests onremoulded saturated clay[J].Geotechnique,10(4):166~180.
Qu Y X,Zhang Y S,Yang J F,et al.2000.Theory and practice ofengineering geology classify of integration of expansive rock and soilof China[A]∥Engineering Geology Commission,China GeologySociety.Fifty years of engineering geology of China[M].Beijing:Seismological Press.
Roscoe K H,Burland J B.1968.On the generalized stress-strainbehavior of“Wet”clay[A]∥Heyman J,Leckie F A.Engineeringplasticity[M].Cambridge,England:Cambridge University Press,535~609.
Schofield A N.2006.Interlocking,and peak and design strengths[J].Geotechnique,56(5):357~358.
Shen Z J.2000.Theoretical soil mechanic[M].Beijing:China WaterResource&Hydropower Press.
Wood D M.1990.Soil behavior and critical state soil mechanics[M]London:Cambridge University Press.
Xu Y F.1997.Research on structure model and mechanicacharacteristic of unsaturated expansive soil[Doctorate Thesis][D]Nanjing:Hohai University.
Yamamuro J A,Lade P V.1998.Steady-state concepts and statiliquefaction of silty sands[J].Journal of Geotechnical andGeoenvironment Engineering,ASCE,124(9):868~877.
Yao Y P,Hou W.2008.A unified hardening model for K0overconsolidated clays[J].Chinese Journal of GeotechnicaEngineering,30(3):316~322.
Yuan J P.2003.Research on generalized model of fissures and slopstability for unsaturated expansive soil[Doctorate Thesis][D]Nanjing:Hohai University.
Zhai Y.2000.Fundamental shear behavior of saturated loose fills ocompletely decom-posed rocks[Doctorate Thesis][D].Hong KongThe University of Hong Kong.
李志清.2008.非饱和膨胀土力学特性及其工程处置研究[博士学位论文][D].北京:中国科学院研究生院.
李志清,李涛,胡瑞林,等.2008.蒙自重塑膨胀土膨胀变形特性与施工控制研究[J].岩土工程学报,30(12):1855~1860.
刘元雪,施建勇.2003.基于应力空间变换的修正剑桥模型改进[J].岩土力学,24(1):1~7.
缪林昌.1999.非饱和膨胀土的变形与强度特性研究[博士学位论文][D].南京:河海大学.
曲永新,张永双,杨俊峰,等.2000.中国膨胀性岩、土一体化工程地质分类的理论与实践[A]∥中国地质学会工程地质专业委员会.中国工程地质五十年[M].北京:地震出版社.
沈珠江.2000.理论土力学[M].北京:中国水利水电出版社.
徐永福.1997.非饱和膨胀土的结构模型和力学性质的研究[博士学位论文][D].南京:河海大学.
姚仰平,侯伟.2008.K0超固结土的统一硬化模型[J].岩土工程学报,30(3):316~322.
袁俊平.2003.非饱和膨胀土的裂隙概化模型与边坡稳定研究[博士学位论文][D].南京:河海大学.
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