寒区湿地软土地基固结沉降的预测
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摘要
目的推测寒区湿地公路软土地基固结沉降过程和最终沉降量,为类似地区的项目设计及施工提供参考.方法对室内试验和现场监测数据,采用分级加载固结度理论,对软土地基固结沉降计算中随加载逐级改变计算参数并给出了计算通式.结果根据试验路段监测结果,采用分阶段拟合,通过3种拟合方法比较,得出了适合预测寒区湿地软土地基固结沉降的曲线.采用分级加载固结度理论,逐级改变计算参数,使得计算结果与实测结果更加接近;在3种曲线拟合方法中,采用双曲线法分阶段拟合的结果与观测曲线最接近,而最终沉降量的预测各种方法得到比较一致的结果.结论经验证逐级改变计算参数的计算方法是合理的,为工程项目施工及类似工程项目的设计提供参考依据.
Adopting the methods of changing parameters stage by stage and curve matching,the author speculated the consolidation settlement process and final settlement of wetland soft soil foundation in cold areas.According to the dates of indoor testing and field monitoring,adopting the multi-stage filling consolidation theory,the author gave the thoughts and formulate as to change parameters with multi-stage filling in calculation of the consolidation and settlement of wetland soft soil foundation.The author validated the rationality of provided methods by comparing the results of test and theory.By adopting staged matching and comparing some matching methods,the author provided the curves for predicting the consolidation and settlement of wetland soft soil foundation based on the results of testing of road section.As using the multi-stage filling consolidation theory and changing parameters stage by stage,the results of calculating closed to testing dates.Among the three curve matching methods,the results of staged matching method of hyperbola was closer to the monitoring curve.But as to the prediction of the final settlement,all the methods got the coherent results.The rationality of the calculation method by changing parameter stage by stage was proved.The research production provided the reference to construction of engineering projects.
Adopting the methods of changing parameters stage by stage and curve matching,the author speculated the consolidation settlement process and final settlement of wetland soft soil foundation in cold areas.According to the dates of indoor testing and field monitoring,adopting the multi-stage filling consolidation theory,the author gave the thoughts and formulate as to change parameters with multi-stage filling in calculation of the consolidation and settlement of wetland soft soil foundation.The author validated the rationality of provided methods by comparing the results of test and theory.By adopting staged matching and comparing some matching methods,the author provided the curves for predicting the consolidation and settlement of wetland soft soil foundation based on the results of testing of road section.As using the multi-stage filling consolidation theory and changing parameters stage by stage,the results of calculating closed to testing dates.Among the three curve matching methods,the results of staged matching method of hyperbola was closer to the monitoring curve.But as to the prediction of the final settlement,all the methods got the coherent results.The rationality of the calculation method by changing parameter stage by stage was proved.The research production provided the reference to construction of engineering projects.
引文
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[12]刘红军.寒区湿地软土地基固结沉降与稳定性研究[D].哈尔滨:中国地震局工程力学研究所,2006.
[13]Sridharan A,Murthvand N S,Prskash K.Rectangularhyperbola method of consolidation analysis[J].Geotechnique,1987,37(3):355-368.
[14]Siew-Ann Tan.Validation of hyperbolic settlementmethod for settlement in clays with vertical drains[J].Soils and Foundations,1995,35(1):101-113.
[15]宰金珉,梅国雄.成长曲线在地基沉降预测中的应用[J].南京建筑工程学院学报,2000(2):8-11.
[16]潘林有,谢新宇.用曲线拟合的方法预测软土地基沉降[J].岩土力学,2004,25(7):1053-1058.
[2]潘林有,谢新宇,罗昕,等.软土地基实测沉降的拟合和预测[J].哈尔滨工业大学学报,2004,36(11):1470-1475.
[3]赵九斋.连云港软土路基沉降研究[J].岩土工程学报,2000,22(6):643-649.
[4]赵明华,杨明辉,刘煜,等.软土路基固结沉降机理及其预测方法研究[J].铁道科学与工程学报,2005,2(4):16-20.
[5]刘加才,赵维炳,施建勇,等.竖向排水井地基工后沉降预测[J].岩土力学,2006,27(9):1475-1479.
[6]郑永来,童琪华,杨柳峰.软土路堤沉降预测方法研究[J].同济大学学报:自然科学版,2005,33(12):1581-1585.
[7]陈小丹,赵维炳.考虑井阻和涂抹的砂井地基平面应变等效方法分析[J].岩土力学,2005,26(4):567-570.
[8]谢康和,周开茂.未打穿竖向排水井地基固结理论[J].岩土工程学报,2006,28(6):679-684.
[9]Hird C C.Finite Element Modelling of VerticalDrains Beneath Embankments on Soft Ground[J].Geotechnique,1992,42(3):499-511.
[10]Indraratna B,Redana I.W.Plane-Strain Modellinnof Smear Effects Associated with Vertical Drains[J].Geotech.Div.ASCE,1997,123(5):471-478.
[11]龚晓南.高等土力学[M].浙江:浙江大学出版社,1996.
[12]刘红军.寒区湿地软土地基固结沉降与稳定性研究[D].哈尔滨:中国地震局工程力学研究所,2006.
[13]Sridharan A,Murthvand N S,Prskash K.Rectangularhyperbola method of consolidation analysis[J].Geotechnique,1987,37(3):355-368.
[14]Siew-Ann Tan.Validation of hyperbolic settlementmethod for settlement in clays with vertical drains[J].Soils and Foundations,1995,35(1):101-113.
[15]宰金珉,梅国雄.成长曲线在地基沉降预测中的应用[J].南京建筑工程学院学报,2000(2):8-11.
[16]潘林有,谢新宇.用曲线拟合的方法预测软土地基沉降[J].岩土力学,2004,25(7):1053-1058.
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