干密度对Q_2重塑黄土强度与变形特性的影响
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摘要
为了研究干密度对Q_2重塑黄土强度与变形特性的影响,用非饱和土三轴仪做了3组共27个试验,在试验过程中干密度、吸力及净围压为不变量,得到Q_2重塑黄土的强度及变形特性。试验结果表明:不同干密度下试样的偏应力-轴向应变曲线均呈应变硬化型;相同吸力下,试样的净围压越大,偏应力越大;相同净围压下,试样的吸力越大,偏应力越大。随着干密度增大,试样的偏应力显著增大,硬化趋势也逐渐增强;除个别试样外,其余各试样在剪切过程中均处于剪缩状态;在相同的吸力和净围压下,干密度增大,试样的破坏应力(p_f、q_f)、有效黏聚力c、切线变形模量E_i、极限偏应力(σ_1-σ_3)_(ult)及参数k均在增大,参数n随着干密度增大而减小。
In order to analyze the effects of dry density on the strength and deformation characteristics of Q_2 remolded loess, a total of 27 experiments were carried out in three groups with unsaturated soil triaxial apparatus. During the test, dry density, suction and net confining pressure were invariant. The strength of reshaped Q_2 loess was obtained. The test results show that the deviatoric stress-axial strain curves of the specimens are strain hardened under different dry densities. Under the same suction, the larger the net confining pressure of the specimens, the greater the deviatoric stress; under the same net confining pressure. The greater the suction, the greater the bias stress. As the dry density increases, the deviatoric stress of the sample increases remarkably, and the hardening tendency increases gradually. Except for the individual samples, the other samples are in the shearing state during the shearing process; in the same suction and net circumference Under pressure, the dry density increases, the failure stress(p_f, q_f), effective cohesion c, tangent deformation modulus E_i, ultimate deviator stress(σ_1-σ_3)_(ult) and parameter k of the sample increase, and the parameter n increases with the dry density and decrease.
In order to analyze the effects of dry density on the strength and deformation characteristics of Q_2 remolded loess, a total of 27 experiments were carried out in three groups with unsaturated soil triaxial apparatus. During the test, dry density, suction and net confining pressure were invariant. The strength of reshaped Q_2 loess was obtained. The test results show that the deviatoric stress-axial strain curves of the specimens are strain hardened under different dry densities. Under the same suction, the larger the net confining pressure of the specimens, the greater the deviatoric stress; under the same net confining pressure. The greater the suction, the greater the bias stress. As the dry density increases, the deviatoric stress of the sample increases remarkably, and the hardening tendency increases gradually. Except for the individual samples, the other samples are in the shearing state during the shearing process; in the same suction and net circumference Under pressure, the dry density increases, the failure stress(p_f, q_f), effective cohesion c, tangent deformation modulus E_i, ultimate deviator stress(σ_1-σ_3)_(ult) and parameter k of the sample increase, and the parameter n increases with the dry density and decrease.
引文
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[14] 王萌,张吾渝,常立君,等.含水率和干密度对青海重塑黄土强度影响研究[J].青海大学学报(自然科学版),2016,34(2):5-11.
[15] 石建刚,邵生俊,陶虎,等.非饱和土的真三轴试验及强度变形特性分析[J].岩土工程学报,2011,33(S1):85-90.
[16] 闫芙蓉,胡雪源,崔芳.非饱和黄土抗剪强度特性试验研究[J].水利与建筑工程学报,2017,15(5):100-104.
[17] 扈胜霞,张栋,杨瑞,等.非饱和重塑黄土固结特性试验研究[J].水利与建筑工程学报,2016,14(4):55-58.
[18] 陈正汉,孙树国,方祥位,等.多功能土工三轴仪的研制及其应用[J].后勤工程学院学报,2007,23(4):1-5.
[19] 高登辉,陈正汉,郭楠,等.干密度和基质吸力对重塑非饱和黄土变形与强度特性的影响[J].岩石力学与工程学报,2017,36(3):736-744.
[2] Alonso E E, Gens A, Josa A. A constitutive model for partially saturated soils[J]. Geotechnique, 1990,40(3):405-430.
[3] 张常光,张庆贺,赵均海.非饱和土抗剪强度及土压力统一解[J].岩土力学,2010,31(6):1871-1876.
[4] 姚攀峰,祁生文,张明.基于路径的非饱和土抗剪强度指标确定方法[J].岩土力学,2009,30(9):2605-2608.
[5] 程海涛,刘保健,谢永利.重塑黄土变形特性[J].长安大学学报(自然科学版),2008,28(5):31-34.
[6] 姚志华,陈正汉,黄雪峰,等.非饱和原状和重塑Q3黄土渗水特性研究[J].岩土工程学报,2012,34(6):1020-1027.
[7] 王娇,邵生俊,陈攀.非饱和重塑黄土的土水特性及压缩屈服与湿陷性的研究[J].岩土力学,2017,38(2):217-222.
[8] 霍晨琛,钱会,孟祥仪.非饱和重塑Q3黄土抗剪强度指标试验研究[J].人民黄河,2017,39(3):127-131.
[9] 陈正汉,周海清,D G Fredlund.非饱和土的非线性模型及其应用[J].岩土工程学报,1999,21(5):603-608.
[10] 陈正汉.重塑非饱和黄土的变形、强度、屈服和水量变化特性[J].岩土工程学报,1999,21(1):82-90.
[11] 马秀婷,邵生俊,杨春鸣,等.非饱和结构性黄土的强度特性试验研究[J].岩土工程学报,2013,35(S2):68-75.
[12] 闫亚景,文宝萍,黄志全.可溶盐对兰州非饱和重塑黄土抗剪强度的影响[J].岩土力学,2017,38(10):2881-2887.
[13] 田堪良,王沛,张慧莉.考虑结构性的原状黄土应力-应变关系的探讨[J].岩土力学,2013,34(7):1893-1898.
[14] 王萌,张吾渝,常立君,等.含水率和干密度对青海重塑黄土强度影响研究[J].青海大学学报(自然科学版),2016,34(2):5-11.
[15] 石建刚,邵生俊,陶虎,等.非饱和土的真三轴试验及强度变形特性分析[J].岩土工程学报,2011,33(S1):85-90.
[16] 闫芙蓉,胡雪源,崔芳.非饱和黄土抗剪强度特性试验研究[J].水利与建筑工程学报,2017,15(5):100-104.
[17] 扈胜霞,张栋,杨瑞,等.非饱和重塑黄土固结特性试验研究[J].水利与建筑工程学报,2016,14(4):55-58.
[18] 陈正汉,孙树国,方祥位,等.多功能土工三轴仪的研制及其应用[J].后勤工程学院学报,2007,23(4):1-5.
[19] 高登辉,陈正汉,郭楠,等.干密度和基质吸力对重塑非饱和黄土变形与强度特性的影响[J].岩石力学与工程学报,2017,36(3):736-744.