摘要
摩擦桩的承载性能决定于桩-土界面之间的剪切特性。为了研究含水率与土质条件等因素对摩擦桩侧摩阻力的影响,设计了摩擦桩的桩-土接触面剪切特性试验装置,进行了粉质黏土、粉土和细砂三种桩周土与三种含水率共9组室内试验。结果表明:摩擦桩的侧摩阻力随着桩的沉降均呈双曲线规律,其初始剪切刚度系数与达到极限摩阻力的沉降量临界值决定于土的类别和含水率大小,细砂的初始剪切刚度略高于相同压实系数的粉质黏土和细砂;而粉质黏土的极限侧摩阻力高于相同压实系数的粉土和细砂;含水率变化对粉土和细砂的极限摩阻力改变显著,而对粉质黏土的极限摩阻力变化相对不敏感,且极限摩阻力最大值均在最优含水率时发生。
The bearing capacity of friction piles depends on the shear characteristics of the pile-soil interface.In order to study the influence of moisture content and soil quality conditions on the friction resistance of friction piles,a test device for the pile-soil contact surface shear characteristics of friction piles was designed,and three types of silty clay,silt and fine sand were tested.There were 9 sets of laboratory tests on soil and three kinds of water content.The results showed that the lateral friction resistance of friction piles was hyperbolic with the settlement of the pile.The initial shear stiffness coefficient and the essential settlement for approaching ultimate lateral friction resistance were determined by the type of soil and the moisture content.The initial shear stiffness of fine sand was slightly higher than that of silty clay and fine sand with the same compaction coefficient;while the ultimate lateral frictional resistance of silty clay was higher than that of silty clay and fine sand with the same compaction coefficient;the ultimate frictional resistance of sand changed significantly,but it was relatively insensitive to the change of ultimate frictional resistance of silty clay,and the maximum value of the ultimate frictional resistance occured at the optimal moisture content.
作者
陈荣刚
马晶
崔壮壮
袁广林
CHEN Ronggang;MA Jing;CUI Zhuangzhuang;YUAN Guanglin(Jiangsu Province Power Transmission Co.,Ltd.,Nanjing 210028,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《工业建筑》
CSCD
北大核心
2020年第11期102-105,31,共5页
Industrial Construction
基金
江苏省送变电有限公司科技项目(2018-JSSBD-03)。
关键词
桩基
桩-土界面
含水率
侧摩阻力
剪切特性
pile foundation
pile-soil interface
moisture content
friction resistance
shear characteristics
