长江口地区考虑次固结的围堤工后沉降计算
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摘要
针对长江口软土地区围堤工程工后沉降量预留往往不准的问题,对该区域淤泥质黏土进行了一系列一维固结试验,研究该地区软土的固结、次固结特性,探究该区域软土的压缩指数、次固结系数及次固结系数与荷载的关系。试验结果表明:长江口地区软土压缩指数小于典型上海软土的压缩指数;该地区软土具有明显的次固结特征,淤泥质黏土的次固结系数在0. 01～0. 025;次固结系数随着荷载的增大先增大后减小。提出了该地区考虑次固结沉降的围堤工后沉降预测方法。试验所得结果及工后沉降预测方法对长江口软土地区的围堤工程工后沉降分析具有一定的指导意义。
For the problem that the embankment reserved settlement after construction cannot be predicted accurately in Yangtze estuary soft soil area,a series of one-dimensional consolidation tests were conducted to study the consolidation and secondary consolidation characteristics of silt soft soil in the Yangtze estuary,and to explore compression index, secondary consolidation coefficient and the relationship between the coefficient of secondary consolidation of soft soil and load. The results show that the compressibility index of soft soil in the Yangtze River estuary is smaller than that of typical Shanghai soft soil.The soft soil in this area has obvious secondary consolidation characteristics,and the secondary consolidation coefficient of silt soft soil in the Yangtze estuary is 0. 01 ～ 0. 025.The secondary consolidation coefficient of soft soil first increases and then decreases with the increase of load.A method for predicting settlement of embankment after construction considering secondary consolidation is put forward. The results of the test and the settlement prediction method after construction have certain guiding significance for settlement analysis of embankment after construction in the soft soil area of the Yangtze estuary.
For the problem that the embankment reserved settlement after construction cannot be predicted accurately in Yangtze estuary soft soil area,a series of one-dimensional consolidation tests were conducted to study the consolidation and secondary consolidation characteristics of silt soft soil in the Yangtze estuary,and to explore compression index, secondary consolidation coefficient and the relationship between the coefficient of secondary consolidation of soft soil and load. The results show that the compressibility index of soft soil in the Yangtze River estuary is smaller than that of typical Shanghai soft soil.The soft soil in this area has obvious secondary consolidation characteristics,and the secondary consolidation coefficient of silt soft soil in the Yangtze estuary is 0. 01 ～ 0. 025.The secondary consolidation coefficient of soft soil first increases and then decreases with the increase of load.A method for predicting settlement of embankment after construction considering secondary consolidation is put forward. The results of the test and the settlement prediction method after construction have certain guiding significance for settlement analysis of embankment after construction in the soft soil area of the Yangtze estuary.
引文
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[2]殷建华.从本构模型研究到试验和光纤监测技术研发[J].岩土工程学报,2011,33(1):1-15.
[3]BUISMAN A S K.Results of long duration settlement tests[C]Proc.,1st Int.Conf.on Soil Mechanics and Foundation Engineering.Delft,the Netherlands:Delft Geotechnics,1936,1:103-106.
[4]MESRI G,GODLEWSKI P M.Time-and stresscompressibility interrelationship[J].Journal of Geotechnical and Geoenvironmental Engineering,1977,103(ASCE12910).
[5]YIN J H,CLARK J I.One-dimensional time dependent stress-strain behavior of soil,elastic viscoplastic modelling,and consolidation analysis[J].Rock and soil mechanics,1994,15(3):65-80.
[6]YIN J H,GRAHAM J.Viscous-elastic-plastic modelling of one-dimensional time-dependent behaviour of clays[J].Canadian geotechnical journal,1989,26(2):199-209.
[7]雷华阳,肖树芳.天津软土的次固结变形特性研究[J].工程地质学报,2002,10(4):385-389.
[8]王常明,王清,张淑华.滨海软土蠕变特性及蠕变模型[J].岩石力学与工程学报,2004,23(2):227-230.
[9]高彦斌,朱合华,叶观宝,等.饱和软黏土一维次压缩系数Ca值的试验研究[J].岩土工程学报,2004,26(4):459-463.
[10]孙德安,申海娥.上海软土的流变特性试验研究[J].水文地质工程地质,2010,37(3):74-78.
[11]雷华阳,张文振,丁小冬,等.考虑软土结构强度的次固结特性试验研究[J].岩土工程学报,2013,35(7):1221-1227.
[12]冯志刚,朱俊高.软土次固结变形特性试验研究[J].水利学报,2009,40(5):583-588.
[13]张芳枝,陈晓平,黄国怡.珠江三角洲饱和软黏土的固结特性试验研究[J].岩土力学,2003,24(S2):192-194.
[14]陈晓平.海陆交互相沉积软土固结效应[J].岩土工程学报,2011,33(4):520-528.
[15]殷宗泽,张海波,朱俊高,等.软土的次固结[J].岩土工程学报,2003,25(5):521-526.
[16]BJERRUM L.Engineering geology of Norwegian normallyconsolidated marine clays as related to settlements of buildings[J].Géotechnique,1967,17(2):83-118.