K_0状态超固结软黏土蠕变性状的试验和理论研究
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摘要
为了研究软黏土K_0应力状态下土体的蠕变规律,对湖州软黏土进行了K_0状态下三轴蠕变试验,从竖向应变和剪切应变2方面对试验结果进行分析,在竖向应变分析中,采用"陈氏法"对试验结果进行处理,得到了超固结比对次固结系数的影响规律;在剪切应变分析中,采用Hu-Xie一维剪切蠕变等效时间模型对试验数据进行了归纳。研究结果表明:超固结软黏土竖向应变的次固结系数随超固结比的增大呈指数型减小,超载预压法能有效减小工后次固结沉降; Hu-Xie模型在超固结土的剪切应变计算中具有较好的适用性。
In order to study the creep characteristics of soft soil in K_0 stress state,the triaxial creep tests in K_0 stress state are conducted for Huzhou soft clay.The test results were analyzed from both vertical strain and shear strain.In the analysis of the vertical strain test results,the effect of overconsolidation ratio on the secondary consolidation coefficient was obtained by processing the test results by "Chen's method".In the analysis of shear strain test results,the Hu-Xie one-dimensional shear creep equivalent time model was used to summarize the test data.The results show that the secondary consolidation coefficient of the vertical strain of overconsolidated soft clay decreases exponentially with the increase of the overconsolidation ratio,which means the overload preloading method can effectively reduce the post consolidation settlement.The results also show that the Hu-Xie equivalent time-line model can properly calculate the shear strain of the soil under any loading path,which indicates that the Hu-Xie model has good applicability in the calculation of shear strain in overconsolidated soil.
In order to study the creep characteristics of soft soil in K_0 stress state,the triaxial creep tests in K_0 stress state are conducted for Huzhou soft clay.The test results were analyzed from both vertical strain and shear strain.In the analysis of the vertical strain test results,the effect of overconsolidation ratio on the secondary consolidation coefficient was obtained by processing the test results by "Chen's method".In the analysis of shear strain test results,the Hu-Xie one-dimensional shear creep equivalent time model was used to summarize the test data.The results show that the secondary consolidation coefficient of the vertical strain of overconsolidated soft clay decreases exponentially with the increase of the overconsolidation ratio,which means the overload preloading method can effectively reduce the post consolidation settlement.The results also show that the Hu-Xie equivalent time-line model can properly calculate the shear strain of the soil under any loading path,which indicates that the Hu-Xie model has good applicability in the calculation of shear strain in overconsolidated soil.
引文
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[2]李国维,胡坚,陆晓岑,等.超固结软黏土一维蠕变次固结系数与侧压力系数[J].岩土工程学报,2012,34(12):2198-2205.LI Guowei,HU Jian,LU Xiaocen,et al.One-dimensional secondary consolidation coefficient and lateral pressure coefficient of over-consolidated soft clay[J].Chinese Journal of Geotechnical Engineering,2012,34(12):2198-2205.
[3]BUISMAN A S.Results of long duration settlement tests[C].Proceedings of 1st Conference on Soil Mechanics and Foundation Engineering,1936.
[4]高彦斌,朱合华,叶观宝,等.饱和软粘土一维次压缩系数Ca值的试验研究[J].岩土工程学报,2004,26(4):459-463.GAO Yanbin,ZHU Hehua,YE Guanbao,et al.The investigation of the coefficient of secondary compression Ca in odometer tests[J].Chinese Jounal of Geotechnical Engineering,2004,26(4):459-463.
[5]周秋娟,陈晓平.软土次固结特性试验研究[J].岩土力学,2006,27(3):404-408.ZHOU Qiujuan,CHEN Xiaoping.Test study on properties of secondary consolidation of soft soil[J].Rock and Soil Mechanics,2006,27(3):404-408.
[6]ALONSO E E,GENS A,LLORET A.Precompression design for secondary settlement reduction[J].Géotechnique,2001,51(9):822-826.
[7]李国维,盛维高,蒋华忠,等.超载卸荷后再压缩软土的次压缩特征及变形计算[J].岩土工程学报,2009,31(1):118-123.LI Guowei,SHENG Weigao,JIANG Huazong,et al.Secondary compression characteristics and settlement calculation of soft clay under overloading-unloading and reloading[J].Chinese Journal of Geotechnical Engineering,2009,31(1):118-123.
[8]陈志波,孔秋平.福州软土次固结变形特性试验研究[J].中南大学学报(自然科学版),2014(10):3602-3607.CHEN Zhibo,KONG Qiuping.Experimental study on secondary consolidation properties of Fuzhou soft soils[J].Journal of Central South University(Science and Technology),2014,45(10):3602-3607.
[9]胡亚元,杨平,余启致.超固结土次固结系数的时间效应[J].中国公路学报,2016,29(9):29-37.HU Yayuan,YANG Ping,YU Qizhi.Time effect of secondary consolidation coefficient of over-consolidated soil[J].China Journal of Highway and Transport,2016,29(9):29-37.
[10]纠永志,黄茂松.超固结软黏土的静止土压力系数与不排水抗剪强度[J].岩土力学,2017,38(4):951-957.JIU Yongzhi,HUANG Maosong.Coefficient of earth pressure at rest and undrained shear strength of overconsolidated soft clays[J].Rock and Soil Mechanics,2017,38(4):951-957,964.
[11]祝艳波,余宏明.巴东组碎屑土夹层的非饱和蠕变经验模型[J].中国公路学报,2016,29(4):22-29.ZHU Yanbo,YU Hongming.Empirical unsaturated creep models for weak intercalated soils of badong formation[J].China Journal of Highway and Transport,2016,29(4):22-29.
[12]谢新宇,李金柱,王文军,等.宁波软土流变试验及经验模型[J].浙江大学学报(工学版),2012,46(1):64-71.XIE Xinyu,LI Jinzhu,WANG Wenjun,et al.Rheological test and empirical model of Ningbo soft soil[J].Journal of Zhejiang University(Engineering Science),2012,46(1):64-71.
[13]王鹏程,骆亚生,胡连信,等.重塑黄土三轴蠕变特性研究及模型分析[J].岩土力学,2015,36(6):1627-1632.WANG Pengcheng,LUO Yasheng,HU Lianxin,et al.Research on triaxial creep characteristics and models of remolded loess[J].Rock and Soil Mechanics,2015,36(6):1627-1632.
[14]胡亚元,谢嘉祺.黏土一维剪切流变的等效时间线模型[J].中国公路学报,2018,31(2):293-297.HU Yayuan,XIE Jiaqi.Equivalent-time-line model of one-dimensional shear rheology for clay[J].China Journal of Highway and Transport,2018,31(2):293-297.
[15]MAYNE P W,KULHAWY F H.K-OCR relationships in soil[J].Geotech Engineering Div ASCE,1982,108(6):851-872.
[16]SINGH A,MITCHELL J K.General stress-strain-time function for soils[J].Journal of the Soil Mechanics&Foundations Division,1968,95:406-415.
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