初始含水率对吹填土压缩和强度特性影响的试验研究
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摘要
吹填土属于未经初始固结、无初始结构的特殊重塑土,其加固前的初始含水率将对加固后土体的压缩沉降和强度产生影响。为了研究初始含水率对吹填土加固过程及结果的影响,开展不同初始含水率吹填土样的正压和真空加载三轴试验研究,并结合前人的试验结果对初始含水率与土样的修正剑桥模型压缩指标λ与强度指标M的关系进行讨论。研究表明,不同于天然沉积的结构性土,吹填土的压缩过程线大致可分为初始结构形成阶段和规律性压缩阶段。随着土样初始含水率的增大,λ值大致呈对数关系增长,M值大致呈对数关系减小。最后,结合研究结果提出吹填土λ值和M值的经验值范围,可为工程应用与后续研究提供一定的参考。
Slurry is a special remoulded soil without preconsolidation and in an unstructured state,and the initial water content before consolidation will affect the compression settlement and the strength of the slurry. To investigate the effects of the initial water content on the process and results of slurry consolidation,positiveloading and vacuum-loading triaxial tests were performed on slurry samples with different initial water contents,and the relationships between the initial water content and soil factors λ and M in modified Cambridge clay model were also investigated based on the test results of previous works and this study. The research results show that the compression procedure of the slurry can be roughly divided into two stages including the initial structure formation stage and the regular compression stage,which differs from the natural deposited soil. With increasing the initial water content,λ increases logarithmically while M decreases logarithmically. The empirical values of λ and M of the slurry were proposed in accordance with the research results to give a reference to the practical engineering and the following researches.
Slurry is a special remoulded soil without preconsolidation and in an unstructured state,and the initial water content before consolidation will affect the compression settlement and the strength of the slurry. To investigate the effects of the initial water content on the process and results of slurry consolidation,positiveloading and vacuum-loading triaxial tests were performed on slurry samples with different initial water contents,and the relationships between the initial water content and soil factors λ and M in modified Cambridge clay model were also investigated based on the test results of previous works and this study. The research results show that the compression procedure of the slurry can be roughly divided into two stages including the initial structure formation stage and the regular compression stage,which differs from the natural deposited soil. With increasing the initial water content,λ increases logarithmically while M decreases logarithmically. The empirical values of λ and M of the slurry were proposed in accordance with the research results to give a reference to the practical engineering and the following researches.
引文
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[15]杨爱武,张兆杰,孔令伟.考虑初始结构性影响的吹填软土应力-应变关系[J].工程地质学报,2014,22(6):1 052-1 057.(YANGAiwu,ZHANG Zhaojie,KONG Lingwei.Stress-strain relationship of soft dredger fill with original structure[J].Journal of Engineering Geology,2014,22(6):1 052-1 057.(in Chinese))
[16]殷杰,高玉峰,洪振舜.连云港软黏土的不排水强度试验研究[J].岩土力学,2009,30(11):3 297-3 301.(YIN Jie,GAO Yufeng,HONG Zhenshun.Research on undrained shear strength tests of soft Lianyungang clay[J].Rock and Soil Mechanics,2009,30(11):3 297-3 301.(in Chinese))
[17]王立峰,陈巧红,庞晋,等.软黏土的结构性及压缩特性研究[J].科技通报,2018,34(7):260-266.(WANG Lifeng,CHEN Qiaohong,PANG Jin,et al.Study on soil structure and compressibility of soft clay[J].Bulletin of Science and Technology,2018,34(7):260-266.(in Chinese))
[18]赵森,曾芳金,王军,等.絮凝-真空预压加固吹填淤泥试验研究[J].岩石力学与工程学报,2016,35(6):1 291-1 296.(ZHAOSen,ZENG Fangjin,WANG Jun,et al.Experimental study of flocculation combined with vacuum preloading to reinforce silt foundation[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(6):1 291-1 296.(in Chinese))
[19]ROSCOE K H,SCHOFIELD A N,WROTH C P.On the yielding of soils[J].Géotechnique,1958,8(1):22-53.
[20]LI X S,DAFALIAS Y F.Anisotropic critical state theory:role of fabric[J].Journal of Engineering Mechanics,ASCE,2012,138(3):263-275.
[21]郭炳川.真空预压加固新近吹填土新工艺及机理研究[博士学位论文][D].天津:天津大学,2015.(GUO Bingchuan.Theory and new technology study on using vacuum preloading to improve recently filled dredge[Ph.D.Thesis][D].Tianjin:Tianjin University,2015.(in Chinese))
[22]XU G,GAO Y,YIN J,et al.Compression behavior of dredged slurries at high water contents[J].Marine Georesources and Geotechnology,2015,33(2):99-108.
[2]HONG Z S,BIAN X,CUI Y J,et al.Effect of initial water content on undrained shear behaviour of reconstituted clays[J].Géotechnique,2013,63(6):441-450.
[3]HONG Z S,ZENG L L,CUI Y J,et al.Compression behaviour of natural and reconstituted clays[J].Géotechnique,2012,62(4):291-301.
[4]高玉峰,殷杰,洪振舜.初始含水率对重塑连云港黏土压缩特性的影响[J].沈阳建筑大学学报:自然科学版,2009,25(5):817-821.(GAO Yufeng,YIN Jie,HONG Zhenshun.Effect of Initial water content on compression behavior of reconstituted Lianyungang clay[J].Journal of Shenyang Jianzhu University:Natural Science,2009,25(5):817-821.(in Chinese))
[5]殷杰,苗永红.重塑黏性土固有压缩特性的探讨[J].工程地质学报,2012,20(3):403-409.(YIN Jie,MIAO Yonghong.Laboratory tests on intrinsic compression behavior of reconstituted clays[J].Journal of Engineering Geology,2012,20(3):403-409.(in Chinese))
[6]骆凉平,吴学春,丁建文.高含水率连云港重塑土压缩性状试验研究[J].科学技术与工程,2013,13(25):7 580-7 584.(LUOLiangping,WU Xuechun,DING Jianwen.Research on compression behavior of Lianyungang reconstituted clay at high initial water contents[J].Science Technology and Engineering,2013,13(25):7 580-7 584.(in Chinese))
[7]卞夏,洪振舜,蔡正银,等.重塑黏土临界状态线随初始含水率的变化规律[J].岩土工程学报,2013,35(1):164-169.(BIAN Xia,HONG Zhenshun,CAI Zhengyin,et al.Change of critical state lines of reconstituted clays with initial water contents[J].Chinese Journal of Geotechnical Engineering,2013,35(1):164-169.(in Chinese))
[8]高盼,陈波,胡云世,等.制样含水量对软黏土力学特性影响的试验研究[J].实验力学,2017,32(3):423-430.(GAO Pan,CHENBo,HU Shiyun,et al.Experimental study of the impact of water content in slurry sample on mechanical behavior of remolded soft clay[J].Journal of Experimental Mechanics,2017,32(3):423-430.(in Chinese))
[9]ZENG L L,HONG Z S,CUI Y J.Determining the virgin compression lines of reconstituted clays at different initial water contents[J].Canadian Geotechnical Journal,2015,52:1 408-1 415.
[10]CERATO A B,LUTENEGGER A J.Determining the intrinsic compressibility of fine-grained soils[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(8):872-877.
[11]CHAI J C,SHEN S L,GENG X.Effect of initial water content and pore water chemistry on intrinsic compression behavior[J].Marine Georesources and Geotechnology,2018,(6):1-7.
[12]施鲁莎,吴发红,徐桂中,等.盐城港滨海港区高含水率淤泥压缩特性研究[J].科学技术与工程,2015,15(16):214-218.(SHI Lusha,WU Fahong,XU Guizhong,et al.The compression behavior of slurries at high water content in Binhai port of Yancheng[J].Science Technology and Engineering,2015,15(16):214-218.(in Chinese))
[13]王圣萍,徐桂中,张林,等.海水环境下初始含水率对蒙脱土压缩特性影响规律研究[J].盐城工学院学报:自然科学版,2016,(2):68-72.(WANG Shengping,XU Guizhong,ZHANG Lin,et al.Research of the influence of initial moisture content on compression properties of montmorillonite under the environment of seawater[J].Journal of Yancheng Institute of Technology:Natural Science,2016,(2):68-72.(in Chinese))
[14]陈存礼,蒋雪,苏铁志,等.结构性对压实黄土无侧限压缩特性的影响[J].岩石力学与工程学报,2014,33(12):1 939-1 944.(CHEN Cunli,JIANG Xue,SU Tiezhi,et al.Influence of soil structure on unconfined compression behaviour of compacted loess[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(12):1 939-1 944.(in Chinese))
[15]杨爱武,张兆杰,孔令伟.考虑初始结构性影响的吹填软土应力-应变关系[J].工程地质学报,2014,22(6):1 052-1 057.(YANGAiwu,ZHANG Zhaojie,KONG Lingwei.Stress-strain relationship of soft dredger fill with original structure[J].Journal of Engineering Geology,2014,22(6):1 052-1 057.(in Chinese))
[16]殷杰,高玉峰,洪振舜.连云港软黏土的不排水强度试验研究[J].岩土力学,2009,30(11):3 297-3 301.(YIN Jie,GAO Yufeng,HONG Zhenshun.Research on undrained shear strength tests of soft Lianyungang clay[J].Rock and Soil Mechanics,2009,30(11):3 297-3 301.(in Chinese))
[17]王立峰,陈巧红,庞晋,等.软黏土的结构性及压缩特性研究[J].科技通报,2018,34(7):260-266.(WANG Lifeng,CHEN Qiaohong,PANG Jin,et al.Study on soil structure and compressibility of soft clay[J].Bulletin of Science and Technology,2018,34(7):260-266.(in Chinese))
[18]赵森,曾芳金,王军,等.絮凝-真空预压加固吹填淤泥试验研究[J].岩石力学与工程学报,2016,35(6):1 291-1 296.(ZHAOSen,ZENG Fangjin,WANG Jun,et al.Experimental study of flocculation combined with vacuum preloading to reinforce silt foundation[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(6):1 291-1 296.(in Chinese))
[19]ROSCOE K H,SCHOFIELD A N,WROTH C P.On the yielding of soils[J].Géotechnique,1958,8(1):22-53.
[20]LI X S,DAFALIAS Y F.Anisotropic critical state theory:role of fabric[J].Journal of Engineering Mechanics,ASCE,2012,138(3):263-275.
[21]郭炳川.真空预压加固新近吹填土新工艺及机理研究[博士学位论文][D].天津:天津大学,2015.(GUO Bingchuan.Theory and new technology study on using vacuum preloading to improve recently filled dredge[Ph.D.Thesis][D].Tianjin:Tianjin University,2015.(in Chinese))
[22]XU G,GAO Y,YIN J,et al.Compression behavior of dredged slurries at high water contents[J].Marine Georesources and Geotechnology,2015,33(2):99-108.