摘要
为了分析深厚软土地区桥梁桩基沉降特点以促进桩基工程安全高效施工,该文以杭甬高速复线某特大桥为工程背景,构建三维网格模型,采用有限差分法分别计算了确定性岩土参数和不确定性岩土参数下的桥梁桩基沉降量,并结合工程区实测数据对比分析了两种情况下桩基沉降量数值模拟结果和理论计算结果。结果表明,通过有限差分法对参数确定和参数不确定模型进行数值计算,得出桩周土体沉降量较大,边缘土体沉降量较小,边排桩沉降量较中间排桩沉降小;使用理论计算方法计算桩基沉降量时,等代墩基法的沉降量计算结果与数值模拟计算结果更相近;工程实测桥墩沉降量相比于数值模拟计算结果和理论计算结果较小;在参数不确定的情况下,采用数值模拟计算来进行桩基沉降的安全评价在一定程度上是可行的。本研究对类似软土地区考虑地层的桩基沉降量计算具有一定的参考意义。
In order to analyze the settlement characteristics of bridge pile foundations in deep soft soil areas and promote the safe and efficient construction of pile foundation projects,a three-dimensional mesh model is constructed with a specific extra-large bridge of Hangzhou to Ningbo Expressway Duplicate Line as the engineering background.The finite difference method is used to calculate the settlements of the bridge pile foundations under both deterministic and uncertain geotechnical parameters,and the numerical simulation results are compared and anylyzed with the theoretical calculation results based on filed-measured data from the project area.Result shows that numerical calculations of the deterministic and uncertain parameter models by the finite difference method yielded a larger soil settlement around the pile group,smaller soil settlement at the edges,and that the settlement of the side-row piles is smaller than that of the middle-row piles.When using the theoretical calculation method to calculate the pile settlement,the settlement calculation result of the equivalent pier method is closer to the numerical simulation calculation result.The measured settlement of the bridge piers is smaller than both the numerical simulation results and the theoretical calculation results.The use of numerical simulation for the safety evaluation of pile settlement is feasible to a certain extent under parameter uncertainty.This study provides valuable reference for the calculation of pile settlement considering stratigraphic conditions in similar soft soil areas.
作者
廖坤阳
彭忠伟
黄孝庆
Liao Kunyang;Peng Zhongwei;Huang Xiaoqing(Fujian Forestry Vocational Technical College;China Railway 16th Bureau Group Third Engineering Co.,Ltd.)
出处
《勘察科学技术》
2025年第4期28-33,共6页
Site Investigation Science and Technology
基金
福建省中青年教师教育科研项目(JAT160743)。
关键词
深厚软土
桩基沉降
参数不确定性
有限差分法
deep soft soil
pile settlement
parameter uncertainty
finite difference method
