大连黏性土压缩指数与物理指标相关性分析
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摘要
土体物理与力学指标间通常具有相关性。基于大连某人工岛地基岩土勘察资料,分别采用单参数(天然含水率、初始孔隙比、重度)与多参数(天然含水率、初始孔隙比、重度、液限、塑性指数)法对压缩指数进行回归分析。基于回归分析结果,统计了上海、广州、江苏、连云港、温州等地黏性土天然含水率与压缩指数的相关性,并建立了二者的经验模型。研究结果表明:当采用单参数回归分析时,压缩指数与天然含水率的相关性较好、预测精度较高;当采用多参数回归分析时,压缩指数与初始孔隙比、干重度、液限组合时的预测精度最高。通过多地区土体压缩指数与天然含水率的相关性分析,得出二者相关系数达到了0.946,表明经验模型适用于上述地区土体压缩指数的近似计算。
In general,the soil physical parameters are related to mechanical parameters. Based on geotechnical investigation data of Dalian artificial island,the regression analysis between compression index and physical parameters were undertaken which used one parameter( natural water content,initial void ratio,unit weight) and multiple parameters( natural water content,initial void ratio,unit weight,liquid limit,plasticity index) methods. Based on the analysis results,the empirical model between natural water content and compression index of clayey soils in Shanghai,Guangzhou,Jiangsu,Lianyungang and Wenzhou is established. The research results showed that,the correlation and precision between compression index and natural water content are better using one parameter method,and the precision between compression index and initial void ratio,unit weight,liquid limit is the best using multiple parameters method. According to the correlation analysis of clayey soils in multi areas,the association coefficiency between compression index and natural water content attained0.946,which indicated that the new model is suitable for approximate calculation of compression index in above areas.
In general,the soil physical parameters are related to mechanical parameters. Based on geotechnical investigation data of Dalian artificial island,the regression analysis between compression index and physical parameters were undertaken which used one parameter( natural water content,initial void ratio,unit weight) and multiple parameters( natural water content,initial void ratio,unit weight,liquid limit,plasticity index) methods. Based on the analysis results,the empirical model between natural water content and compression index of clayey soils in Shanghai,Guangzhou,Jiangsu,Lianyungang and Wenzhou is established. The research results showed that,the correlation and precision between compression index and natural water content are better using one parameter method,and the precision between compression index and initial void ratio,unit weight,liquid limit is the best using multiple parameters method. According to the correlation analysis of clayey soils in multi areas,the association coefficiency between compression index and natural water content attained0.946,which indicated that the new model is suitable for approximate calculation of compression index in above areas.
引文
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[21]武朝军,叶冠林,王建华.上海浅部土层压缩指数与天然含水率的关系[J].岩土力学,2014,35(11):3184-3190.
[2]Cozzolino V M.Statistical Forecasting of Compression Index[C]//Proceedings of the 5th International Conference on Soil Mechanics and Foundation Engineering.Paris:International Society for Soil Mechanics and Foundation Engineering,1961:51-53.
[3]Tanaka H,Locat J,Shibuya S,et al.Characterization of Singapore,Bangkok,and Ariake clays[J].Canadian Geotechnical Journal,2001,38(2):378-400.
[4]Yoon G L,Kim B T,Jeon S S.Empirical correlations of compression index for marine clay from regression analysis[J].Canadian Geotechnical Journal,2004,41(6):1213-1221.
[5]Koppula S D.Statistical estimation of compression index[J].Geotechnical Testing Journal,1981,4(2):68-73.
[6]Rendon-Herrero O.Universal compression index equation[J].Journal of Geotechnical&Geoenvironmental Engineering,1980,106(11):1179-1200.
[7]Schofield A,Wroth P.Critical State Soil Mechanics[M].London:Mcgraw Hill,1968.
[8]Nacci V A,Wang M C,Demars K R.Engineering Behavior of Calcareous Soils[C]//Proceedings of Civil Engineering in the Oceans III.New York:ASCE1975:380-400.
[9]Nakase A,Kamei T,Kusakabe O.Constitute parameters estimated by plasticity index[J].Journal of Geotechnical Engineering,ASCE,1988,114(7):844-858.
[10]魏道垛,胡中雄.上海浅层地基土的前期固结压力及有关压缩性参数的试验研究[J].岩土工程学报,1980,2(4):13-22.
[11]姜安龙,郭云英,高大钊.润扬大桥南汊北锚碇地基土压缩特性[J].建筑科学,2005,21(2):69-71.
[12]缪林昌,张军辉,陈艺南.江苏海相软土压缩特性试验研究[J].岩土工程学报,2007,29(11):1711-1714.
[13]赵有明,江辉煌,张惠明.深圳地区软粘土变形参数研究[J].中国铁道科学,2004,25(3):40-43.
[14]丁雷,江永建,陈多才,等.广州软土的力学特性及相关性分析[J].铁道建筑,2011,(10):75-77.
[15]Azzouz A S,Krizek R J,Corotis R B.Regression analysis of soil compressibility[J].Soils and Foundations,1976,16(2):19-29.
[16]Wroth C P,Wood D M.The correlation of index properties with some basic engineering properties of soils[J].Canadian Geotechnical Journal,1978,15(2):137-145.
[17]Terzaghi K,Peck R B.Soil Mechanics in Engineering Practice[M].New York:John Wiley and Sons,1967.
[18]Gao D Z,Wei D D,Hu Z X.Geotechnical Properties of Shanghai Soils and Engineering Applications[C]//Marine Geotechnology and Nearshore/Offshore Structures.Philadelphia:ASTM,1986:161-177.
[19]Bowles J E.Physical and Geotechnical Properties of Soils[M].New York:Mc Graw-Hill,1989.
[20]白冰,周健,章光.饱和软粘土的塑性指数对其压缩变形参数的影响[J].水利学报,2001,(11):51-55.
[21]武朝军,叶冠林,王建华.上海浅部土层压缩指数与天然含水率的关系[J].岩土力学,2014,35(11):3184-3190.