深厚软土地区大桥群桩沉降现场监测分析

发布时间：2018-06-13 01:39

本文选题：安全工程 + 土木建筑工程测量　；参考：《安全与环境学报》2014年05期

【摘要】：为准确预测高速铁路沉降量,严格控制高速铁路沉降,达到高速铁路的平顺性标准,以某一软土地基高速铁路桥梁墩台为监测对象,采用液位-单点联合自动监测法对天津某特大桥沉降进行了长期观测。实测数据分析显示,单点沉降计布置合理的情况下能准确确定压缩层厚度。与现有规范的压缩层及沉降进行对比分析,结果表明,《公路桥涵地基与基础设计规范》误差最大,压缩层厚度比实测值大141.1%,沉降量比实测值大182.9%;按上海市《地基基础设计规范》得到的沉降量计算值比实测值大4.0%;按《建筑桩基技术规范》得到的应力比为10%,沉降量计算值比实测值大8.9%。与液位沉降计测得的总沉降相比,《铁路桥涵地基和基础设计规范》、《公路桥涵地基与基础设计规范》计算的沉降值偏大,其余规范计算的沉降值均偏小。从可靠性和安全角度考虑,建议采用以10%应力比为条件的"应力控制法"计算压缩层厚度,采用铁路规范方法计算高速铁路深厚松软土层的桥梁桩基总沉降。
[Abstract]:In order to accurately predict the settlement of high-speed railway, strictly control the settlement of high-speed railway and meet the standard of ride comfort of high-speed railway, the pier and abutment of a high-speed railway bridge with soft soil foundation are taken as the monitoring object. A long-term observation on the settlement of a large bridge in Tianjin was carried out by using liquid level-single-point automatic monitoring method. The analysis of measured data shows that the thickness of compressed layer can be accurately determined under the condition of reasonable arrangement of single point settler. Compared with the compression layer and settlement of the existing code, the results show that the design code of highway bridge and culvert foundation has the greatest error. The thickness of the compressed layer is 141.1 larger than the measured value, the settlement is 182.9 larger than the measured value, the calculated value of settlement according to Shanghai Foundation Design Code is 4.0 larger than the measured value, the stress ratio obtained according to the Technical Specification for Building pile Foundation is 10, and the settlement is greater than the measured value. The calculated value is 8.9 larger than the measured value. Compared with the total settlement measured by liquid level settlement, the Code for Design of Railway Bridge culvert Foundation and Foundation, the calculated settlement value of Highway Bridge culvert Foundation and Foundation Design Code are larger than those of other codes. From the point of view of reliability and safety, it is suggested that the "stress control method" under the condition of 10% stress ratio should be used to calculate the thickness of compressed layer, and the railway code method should be used to calculate the total settlement of bridge pile foundation in deep soft soil of high-speed railway.
【作者单位】：西南交通大学土木工程学院;
【基金】：铁道部重大科技项目(2008G031-B)
【分类号】：U443.15

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