基于三轴试验红层泥岩的邓肯-张模型参数研究
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摘要
兰州地区红层泥岩形成于干旱、半干旱环境,其物理力学特性与其他地区的红层泥岩不同。以G6京藏高速兰海养护维修工程的红层泥岩路基填料为研究对象,通过大量的常规三轴试验,研究含水率对其力学特性及邓肯-张模型参数的影响。结果表明:在不同含水率下兰州地区红层泥岩的应力-应变曲线关系符合双曲线模型。含水率小于最优含水率时,破坏形式为剪切破坏;含水率大于最优含水率,破坏形式为鼓状破坏;随着含水率的增加,黏聚力和内摩擦角逐渐减小,内摩擦角减小的幅度更大,究其原因是含水率对黏聚力和内摩擦角的影响机理不同而导致。采用数学模型进行拟合发现:黏聚力、内摩擦角与含水率分别呈二次抛物线与对数曲线关系。不同含水率下邓肯-张模型参数破坏比R_f在区间(0.869,0.984)内波动,K值随含水率增大而减小呈负线性关系,n值随含水率的增大而增大呈线性关系。
The red mudstone in the Lanzhou area formed in arid and semi-arid environments has different physical and mechanical properties than that in other areas. This study investigates the red mudstone roadbed filling of Lanzhou—Haikou Maintenance Project in G6 Beijing—Tibet Expressway. Through a large number of conventional triaxial tests, the influences of the water content on the mechanical properties and Duncan—Zhang model parameters of the red mudstone were studied. The results show that the stress-strain curve of the red mudstone in the Lanzhou area satisfies the hyperbolic model under different moisture contents. When the moisture content is less than the optimum content, the failure mode is shear failure; when the moisture content is greater than the optimal moisture content, the failure mode is drum failure. With the increase of water content, the internal friction angle gradually decreases more than cohesion because the water content has different effects on the cohesion and internal friction angle. The mathematical model was used for fitting, and it was determined that the relation between the cohesion and water content and the relation between the internal friction angle and water content featured a quadratic parabola and logarithmic curve, respectively. The failure ratio, R_f, of Duncan—Chang model parameters under different moisture contents fluctuates within the interval(0.869, 0.984); the K value decreases linearly with the increase of water content, and the n value increases linearly with the increase of water content.
The red mudstone in the Lanzhou area formed in arid and semi-arid environments has different physical and mechanical properties than that in other areas. This study investigates the red mudstone roadbed filling of Lanzhou—Haikou Maintenance Project in G6 Beijing—Tibet Expressway. Through a large number of conventional triaxial tests, the influences of the water content on the mechanical properties and Duncan—Zhang model parameters of the red mudstone were studied. The results show that the stress-strain curve of the red mudstone in the Lanzhou area satisfies the hyperbolic model under different moisture contents. When the moisture content is less than the optimum content, the failure mode is shear failure; when the moisture content is greater than the optimal moisture content, the failure mode is drum failure. With the increase of water content, the internal friction angle gradually decreases more than cohesion because the water content has different effects on the cohesion and internal friction angle. The mathematical model was used for fitting, and it was determined that the relation between the cohesion and water content and the relation between the internal friction angle and water content featured a quadratic parabola and logarithmic curve, respectively. The failure ratio, R_f, of Duncan—Chang model parameters under different moisture contents fluctuates within the interval(0.869, 0.984); the K value decreases linearly with the increase of water content, and the n value increases linearly with the increase of water content.
引文
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[2] 王骑虎.甘肃红层工程地质特性与边坡稳定性研究[D].北京:北京工业大学,2016.WANG Qihu.Study on Engineering Geological Characteristics and Slope Stability of Red Beds in Gansu[D].Beijing:Beijing University of Technology,2016.
[3] 简文星,殷坤龙,马昌前,等.万州侏罗纪红层软弱夹层特征[J].岩土力学,2005,26(6):901-905,914.JIAN Wenxing,YIN Kunlong,MA Changqian,et al.Characteristics of Incompetent Beds in Jurassic Red Clastic Rocks in Wanzhou[J].Rock and Soil Mechanics,2005,26(6):901-905,914.
[4] 程强,周德培,封志军.典型红层软岩软弱夹层剪切蠕变性质研究[J].岩石力学与工程学报,2009,28(增刊1):3176-3180.CHENG Qiang,ZHOU Depei,FENG Zhijun.Shear Creep Properties of Weak Interlayers of Typical Red-layer Soft Rock[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(Supp1):3176-3180.
[5] 王宇,艾芊,李建林.节理软岩压缩破坏后崩解特性试验研究[J].水利水电技术,2017,48(12):153-158.WANG Yu,AI Wei,LI Jianlin.Experimental Study on Disintegration Characteristics of Jointed Soft Rock after Compressive Failure[J].Water Resources and Hydropower Engineering,2017,48(12):153-158.
[6] 张可能,周斌,彭环云,等.湘西高速公路红砂岩工程特性及边坡稳定分析[J].南华大学学报(自然科学版),2009,23(3):5-9.ZHANG Keneng,ZHOU Bin,PENG Huanyun,et al.Engineering Properties and Stability Analysis of Red Sandstone in Xiangxi Expressway[J].Journal of Nanhua University (Science & Technology),2009,23(3):5-9.
[7] 程强,寇小兵,黄绍槟,等.中国红层的分布及地质环境特征[J].工程地质学报,2004,12(1):34-40.CHENG Qiang,KOU Xiaobing,HUANG Shaobin,et al.The Distributes and Geologic Environment Characteristics of Red Beds in China[J].Journal of Engineering Geology,2004,12(1):34-40.
[8] 柳群义.红层路堑边坡稳定性与防治研究[D].长沙:中南大学,2010.LIU Qunyi.Study on the Stability of Road Slope with Red Bedded Rock Mass and Its Reinforcement Techniquee[D].Changsha:Central South University,2010.
[9] 赵蕊,左双英,王嵩,等.不同含水量贵阳重塑红黏土三轴抗剪强度试验研究[J].水文地质工程地质,2015,42(5):90-95.ZHAO Rui,ZUO Shuangying,WANG Song,et al.T Experiment and Mechanism Analysis of Water Contents on Triaxial Shear Strength of the Remodeled Red Clay of Guiyang[J].Hydrogeology and Engineering Geology,2015,42(5):90-95.
[10] 李江,许强,胡泽铭,等.川东红层原状滑带土饱水软化试验研究[J].岩石力学与工程学报,2015,34(增刊2):4333-4342.LI Jiang,XU Qiang,HU Zeming,et al.Experimental Research on Softening of Undisturbed Saturated Slip Soil in Eastern of Sichuan Province Red Bed[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(Supp2):4333-4342.
[11] 封志军,周德培,周应华,等.红层软岩三轴应力-应变全过程试验研究[J].路基工程,2005(6):32-35.FENG Zhijun,ZHOU Depei,ZHOU Yinghua,et al.Triaxial Testing Analysis by Complete Stress-Strain Process on “ Red Layer” Soft Rocks[J].Subgrade Engineering,2005(6):32-35.
[12] 龙万学,陈开圣,肖涛,等.非饱和红黏土三轴试验研究[J].岩土力学,2009,30(增刊2):28-33.LONG Wanxue,CHEN Kaisheng,XIAO Tao,et al.Research of General Triaxial Test for Unsaturated Red Clay[J].Rock and Soil Mechanics,2009,30(Supp2):28-33.
[13] 王智猛,蒋关鲁,魏永幸.红层泥岩土邓肯-张模型参数试验研究[J].路基工程,2009(6):52-54.WANG Zhimeng,JIANG Guanlu,WEI Yongxing.Experimental Research on Duncan-Chang Model Parameters of Red Mudstone Soil[J].Journal of Subgrade Engineering,2009(6):52-54.
[14] 何蕾,文宝萍,李慧.水在兰州地区红层风化泥岩抗剪强度中的综合效应[J].水文地质工程地质,2010,37(3):48-52.HE Lei,WEN Baoping,LI Hui.Effects of Pore Water in Shear Strength of Weathered Red Mudstone in Lanzhou Area,China[J].Hydrogeology and Engineering Geology,2010,37(3):48-52.
[15] 交通部公路科学研究所.公路土工试验规程:JTG E40-2007[S].北京:人民交通出版社,2007.Institute of Highway Science,Ministry of Communications.Highway Geotechnical Test Procedures:JTG E40-2007[S].Beijing:China Communications Press,2007.
[16] 陈祖煜.土质边坡稳定分析原理·方法·程序[M].北京:中国水利水电出版社,2003.CHEN Zuyu.Soil Slope Stability Analysis[M].Beijing:China Water Resources and Hydropower Press,2003.
[17] 马琳,王清,原国红.红土中游离氧化铁作用的试验研究[J].哈尔滨商业大学学报(自然科学版),2007,23(1):53-57.MA Lin,WANG Qing,YUAN Guohong.Experimental Study on Function of Free Iron Oxide in Red Soil[J].Journal of Harbin University of Commerce (Natural Science Edition),2007,23(1):53-57.