摘要
滨海地区存在大量的软土、淤泥和淤泥质黏土,在建筑物等外荷载作用下容易产生较大的沉降,群桩复合基础可以提高软土地区的承载力,减少建筑物的沉降。为了研究群桩基础的承载力特性,依托某软土地区高速公路实际工程,借助数值模拟手段,分别对素土、群桩条件下的承载力特性进行了分析,其中群桩工况考虑了桩间距、桩长和桩径三个影响因素。分析结果表明:相同的条件下,素土的承载力为2 300kN,群桩的承载力52 000kN。群桩可以显著提高软土的承载力,桩径、桩长和桩间距可显著影响群桩的承载特性,其中增大桩长和缩短桩间距可更好地提升承载力,施工时需要综合比选以确定最佳组合方案。
Due to the existence of a large amount of soft soil,silt and silty clay in the coastal area,the area is prone to large settlement under the action of external loads such as buildings.The pile group composite foundation can improve the bearing capacity of soil area and reduce the settlement of buildings.In order to study the bearing capacity characteristics of pile group foundation,the bearing capacity characteristics of plain soil and pile group are analyzed respectively by means of numerical simulation on the basis of a practical highway project in a soft soil area.Pile spacing,pile length and pile diameter are considered in pile group working condition.The results show that the bearing capacity of plain soil is 2300 kN and that of pile group is 52000 kN under the same conditions.Pile group can significantly improve the bearing capacity of soft soil.Pile spacing,pile length and pile diameter can significantly affect the bearing characteristics of pile group.In addition,increasing pile length and shortening pile spacing can improve bearing capacity better.Therefore,comprehensive comparison and selection are needed to determine the best combination scheme during construction.
作者
蔡旭梅
CAI Xumei(The second Exploration,Zhejiang Coal Geological Exploration Team,Hangzhou,Zhejiang 310000)
出处
《中国煤炭地质》
2023年第3期41-48,共8页
Coal Geology of China
关键词
软土
群桩
承载特性
数值模拟
应力变形
soft soil
pile group
bearing characteristics
numerical simulation
stress and deformation
