软土地基上大型沉井基础安全监控模型
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摘要
为了提高软土地基上大型沉井基础稳定性评价和安全监控的有效性,以江阴长江公路大桥北锚碇沉井基础为对象,在研究影响其稳定和安全运营主要因素的基础上,探讨了监控系统的主要结构,并从基础位移监控、基础抗滑稳定监控和地基土稳定监控3个方面建立了散索鞍水平位移监控模型、沉井前侧地基土水平向反力监控模型和基底反力监控模型.在综合现场观测数据和数值模拟结果的基础上,探讨了监控模型中原因量的主要构成及其与监控效应量之间函数关系的确定方法,并给出了江阴长江公路大桥北锚碇沉井基础主要控稳模型——散索鞍水平位移监控模型在通车运营期的具体函数表达式.研究结果表明,基础变位是软土地基上大型沉井基础的主要控稳因素,通过安全监控模型对其进行控制能为建筑物的安全运营提供保障.
In order to raise the stability of evaluation and the effectiveness of safety monitoring of large caisson foundations in soft soil,the caisson foundation at the north anchorage of the Jiangyin Yangtze River Bridge was examined as an example.Based on studies on the factors influencing its stability and safe operation,the main structure of the monitoring system was discussed.Three monitoring models respectively for the horizontal displacement of cable saddles,the horizontal reaction force of the foundation soil in front of the caisson and the reaction force at the foundation bottom were established for evaluation of the following three monitoring aspects: the displacement of the foundation,the anti-sliding stability of the foundation,and the stability of the foundation soil. On the basis of the observed data and numerical simulation results,the main components of the cause quantity in the monitoring models and its relationship with the effect quantity were discussed.A specific expression during the period of traffic operation was proposed for the main monitoring model of the caisson foundation at the north anchorage of the Jiangyin Yangtze River Bridge,that is,the monitoring model for the horizontal displacement of cable saddles.The results show that the displacement of the foundation is the control factor for large caisson foundations in soft soil.The monitoring model is helpful to the safe operation of similar structures.
In order to raise the stability of evaluation and the effectiveness of safety monitoring of large caisson foundations in soft soil,the caisson foundation at the north anchorage of the Jiangyin Yangtze River Bridge was examined as an example.Based on studies on the factors influencing its stability and safe operation,the main structure of the monitoring system was discussed.Three monitoring models respectively for the horizontal displacement of cable saddles,the horizontal reaction force of the foundation soil in front of the caisson and the reaction force at the foundation bottom were established for evaluation of the following three monitoring aspects: the displacement of the foundation,the anti-sliding stability of the foundation,and the stability of the foundation soil. On the basis of the observed data and numerical simulation results,the main components of the cause quantity in the monitoring models and its relationship with the effect quantity were discussed.A specific expression during the period of traffic operation was proposed for the main monitoring model of the caisson foundation at the north anchorage of the Jiangyin Yangtze River Bridge,that is,the monitoring model for the horizontal displacement of cable saddles.The results show that the displacement of the foundation is the control factor for large caisson foundations in soft soil.The monitoring model is helpful to the safe operation of similar structures.
引文
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[7]李筱艳,陈志坚,董学武,等.长江下游桥梁工程地基土体渗透特性研究[J].岩石力学与工程学报,2005,24(10):1692-1696.(LI Xiao-yan,CHEN Zhi-jian,DONG Xue-wu,et al.Study on permeability of foundation soil of bridges on lower reaches of YangtzeRiver[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(10):1692-1696.(in Chinese))
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[10]胡世德,范立础.江阴长江公路大桥纵向地震反应分析[J].同济大学学报:自然科学版,1994,22(4):43-48.(HU Shi-de,FAN Li-chu.The longitudinal earthquake response analysis for the Jiangyin Yangtze River Bridge[J].Journal of Tongji University:NaturalScience,1994,22(4):43-48.(in Chinese))
[2]吉林,冯兆祥,周世忠.江阴大桥北锚沉井基础变位过程实测研究[J].公路交通科技,2001,18(3):33-35.(JI Lin,FENGZhao-xiang,ZHOU Shi-zhong.Study on Jiangyin Bridge north anchoring sunk shaft foundation displacement process[J].Journal ofHighway and Transportation Research and Development,2001,18(3):33-35.(in Chinese))
[3]吴中如,顾冲时,沈振中,等.大坝安全综合分析和评价的理论、方法及其应用[J].水利水电科技进展,1998,18(3):2-6.(WU Zhong-ru,GU Chong-shi,SHEN Zhen-zhong,et al.Theory and application of dam safety synthetical analysis and assessment[J].Advances in Science and Technology of Water Resources,1998,18(3):2-6.(in Chinese))
[4]陈志坚,周世忠,卓家寿.大跨径悬索桥地基基础安全监控模型的研究思路及技术路线[J].中国工程科学,2002,4(6):20-24.(CHEN Zhi-jian,ZHOU Shi-zhong,ZHUO Jia-shou.Technical methods to make safety monitoring and forecast models for thefoundation of long suspension bridges[J].Engineering Science,2002,4(6):20-24.(in Chinese))
[5]李永盛.江阴长江公路大桥北锚碇模型试验研究[J].同济大学学报:自然科学版,1995,23(2):134-140.(LI Yong-sheng.Experimental study on the north anchorage of the Jiangyin Yangtze Bridge[J].Journal of Tongji University:Natural Science,1995,23(2):134-140.(in Chinese))
[6]胡应德,叶枫,陈志坚.土体邓肯-张非线性弹性模型参数反演分析[J].土木工程学报,2004,37(2):54-57.(HU Ying-de,YEfeng,CHEN Zhi-jian.Back-performing analysis for parameters of Duncan-Chang nonlinear-elastic soil model[J].China Civil EngineeringJournal,2004,37(2):54-57.(in Chinese))
[7]李筱艳,陈志坚,董学武,等.长江下游桥梁工程地基土体渗透特性研究[J].岩石力学与工程学报,2005,24(10):1692-1696.(LI Xiao-yan,CHEN Zhi-jian,DONG Xue-wu,et al.Study on permeability of foundation soil of bridges on lower reaches of YangtzeRiver[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(10):1692-1696.(in Chinese))
[8]赵启林,陈斌,卓家寿.悬索桥锚碇及地基基础中的力学问题研究动态[J].水利水电科技进展,2001,21(1):22-26.(ZHAOQi-lin,CHEN Bin,ZHUO Jia-shou.Developments in mechanical analysis of suspension bridges’anchorage and foundation[J].Advancesin Science and Technology of Water Resources,2001,21(1):22-26.(in Chinese))
[9]周世忠.江阴长江公路大桥北锚碇的施工与控制[J].国外桥梁,2000(4):56-59.(ZHOU Shi-zhong.Construction and monitoringof the north anchorage of Jiangyin Yangtze River Highway Bridge[J].Foreign Bridges,2000(4):56-59.(in Chinese))
[10]胡世德,范立础.江阴长江公路大桥纵向地震反应分析[J].同济大学学报:自然科学版,1994,22(4):43-48.(HU Shi-de,FAN Li-chu.The longitudinal earthquake response analysis for the Jiangyin Yangtze River Bridge[J].Journal of Tongji University:NaturalScience,1994,22(4):43-48.(in Chinese))
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