沉积作用及应力历史对自重应力和沉降的影响
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摘要
土体的沉积作用和应力历史会影响土体自重应力的确定,也会影响地基最终沉降量的确定。鉴于e-lnp比e-lgp坐标图能更方便、精确地描述线性问题,根据e-lnp坐标图推导沉积作用对成层土、正常固结土、超固结土的自重应力与沉降影响的计算式。用该计算式对昆明滇池国际会展中心部分深厚软土地基的自重应力和最终沉降量进行计算,并用计算结果和不考虑沉积作用及应力历史影响的计算结果进行对比分析,结果表明,沉积作用对深厚软粘土自重应力和最终沉降量计算值的影响非常显著,并且土体厚度越厚、上覆荷载越大,其影响越明显。
Soil sedimentation and stress history have great impact on the determination of soil gravity stress and the final settlement of the foundation soil.Due to the accurate and convenient of coordinate in dealing with the linear problem over coordinate,thus it is often applied to calculate the influence of sedimentation and gravity stress of the normal consolidated soil and over-consolidated soil.This formula is to used to calculate the gravity stress value and final settlement value of deep soft clay which came from Kunming exhibition Center near Dianchi Lake,while the calculation result is used to make a comparison with historical data of stress value and settlement impact.The result showed that the sedimentation has great impact to the gravity and final settlement value of deep soft clay,furthermore,the thicker of the soil will bring the bigger of the overlying load consistently.
Soil sedimentation and stress history have great impact on the determination of soil gravity stress and the final settlement of the foundation soil.Due to the accurate and convenient of coordinate in dealing with the linear problem over coordinate,thus it is often applied to calculate the influence of sedimentation and gravity stress of the normal consolidated soil and over-consolidated soil.This formula is to used to calculate the gravity stress value and final settlement value of deep soft clay which came from Kunming exhibition Center near Dianchi Lake,while the calculation result is used to make a comparison with historical data of stress value and settlement impact.The result showed that the sedimentation has great impact to the gravity and final settlement value of deep soft clay,furthermore,the thicker of the soil will bring the bigger of the overlying load consistently.
引文
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[2]WEBER W G.Performance of embankments constructed over peat[J].Journal of Soil Mechanics and Foundations,ASCE,1969,95(1):53-76.
[3]CARGILL K W.Prediction of consolidation of very soft soil[J].Journal of Geotechnical Engineering,ASCE,1984,100(6):125-157.
[4]郑辉,谢康和.双层饱和软土地基一维大应变固结研究[J].岩土力学,2004,25(11):1770-1775.ZHENG H,XIE K H.Study of one dimensional large strain consolidation of double-layered saturated soft soils[J].Rock and Soil Mechanics,2004,25(11):1770-1775.(in Chinese)
[5]FUNGAROLI A A,PRANGER S R.Unit weights of a normally consolidated soil[C]//Proceedings of the7th International Conference on Soils Mechanics and Foundation Engineering,Mexico,1969:131-134.
[6]DE SIMON P,VIGGIANI C.Settlement of a thick bed of normally consolidated uniform clay[J].Geotechnique,1975,25(2):390-393.
[7]LI K S.Predicting the density profile and settlement of marine deposits[C]//Proceedings of International Conference on Computational Methods in Structural and Geotechnical Engineering,HongKong:China Translation&Printing Services Ltd,1994:1562-1567.
[8]谢康和,胡安峰.考虑沉积作用的成层地基自重应力与沉降计算[J].岩石力学与工程学报,2004,23(9):1585-1589XIE K H,HU A F.Discussion of settlement modification considering stress history of soil mass[J].Rock and Soil Mechanics,2004,23(9):1585-1589.(in Chinese)
[9]刘占芳,杨全虎.饱和软土地基弹塑性固结沉降研究[J].重庆建筑大学学报,2005,27(2):51-55.LIU Z F,YANG Q H.On elasto-plastic consolidation settlement of saturated soft clay[J].Journal of Chongqing Jianzhu University,2005,27(2):51-55.(in Chinese)
[10]李剑,陈善熊.应力历史对冲塑红黏土动力特性影响的试验研究[J].岩土工程学报,2014,36(9):1657-1665.LI J,CHEN S X.Experimental study on influence of stress history on dynamic properties of remolded red clay[J].Chinese Joural of Geotechnical Engineering,2014,36(9):1657-1665.(in Chinese)
[11]李新明,孔令伟.考虑超固结比和应力速率影响的膨胀土卸荷力学特性研究[J].岩土力学,2013,34(10):121-127.LI X M,KONG L W.Effects of oversonsolidation ratio and stress rate on unloading mechanical behavior of expansive clay[J].Rock and Mechanics,2013,34(10):121-127.(in Chinese)
[12]SAYE S R,DAN A B,LUTENEGGER A J.Assessing adhesion of driven pipe piles in clay using adaption of stress history and normalized soil engineering parameter concept[J].Journal of Geotechnical and Geoenvironmental Engineering,2013,139(7):1062-1074.
[13]FINNO R J,CHO W.Recent stress-history effects on compressible Chicago glacial clays[J].Journal of Geotechnical and Geoenvironmental Engineering,2011,137(3):197-207.
[14]龚晓南.高等土力学[M].杭州:浙江大学出版社,1996.GONG X N.Advanced Soil Mechanics[M].Hangzhou:Zhejiang University Press,1996.(in Chinese)
[15]张克龚,刘松玉.土力学[M].北京:中国建筑工业出版社,2010.ZHANG K G,LIU S Y.Soil Mechanics[M].Beijing:China Architecture&Building Press,2010.(in Chinese)