风化砂岩层中扩底抗拔桩荷载-位移曲线拟合分析  

Fitting Analysis of Load-displacement Curve of Belled Uplift Piles in Weathered Sandstone Layer

作　　者：唐黔 王良玉 杨柏 黄翔[2] TANG Qian;WANG Liangyu;YANG Bai;HUANG Xiang(409 Geological Team of Hunan Geological Survey Bureau,Yongzhou 425000,Hunan,China;College of Civil Engineering and Architectural,Guilin University of Technology,Guilin 541004,Guangxi,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Architecture and Transportation Engineering,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China)

机构地区：[1]湖南省地质矿产勘查开发局四〇九地质队,湖南永州425000 [2]桂林理工大学土木与建筑工程学院,广西桂林541004 [3]西南交通大学地球科学与环境工程学院,成都610031 [4]桂林电子科技大学建筑与交通工程学院,广西桂林541004

出　　处：《路基工程》2021年第2期94-98,共5页Subgrade Engineering

基　　金：国家自然科学基金(51708146);广西高校中青年教师科研基础能力提升项目(2020KY05035)。

摘　　要：基于抗拔桩极限载荷现场试验,用数学模型对风化砂岩层中扩底抗拔桩的上拔荷载-位移曲线进行拟合分析。结果表明:对于风化砂岩层中的抗拔桩,采用双曲线模型拟合的精度最高,指数函数模型次之,幂函数模型相对较差;双曲线函数计算得到的极限承载力取1.27折减系数后,与实测值更为接近;采用归一化荷载-位移曲线双曲线模型下限曲线函数计算风化砂岩层中抗拔桩的承载力,95%的情况是偏于安全的。Based on the field test of ultimate load of the uplift pile,the mathematical model is used to conduct fitting analysis on the uplift load-displacement curve of the belled uplift pile in the weathered sandstone layer.The results show that the hyperbolic model has the highest fitting accuracy,the exponential function model is the second,and the power function model is relatively poor;the ultimate bearing capacity calculated by the hyperbolic function takes 1.27 reduction coefficient,which is closer to the measured value;the lower limit curve function of the normalized load displacement curve hyperbolic model is used to calculate the bearing capacity of the uplift pile in the weathered sandstone layer and 95%is partial to safety.

关 键 词：嵌岩扩底抗拔桩 数学模型 荷载-位移曲线 双曲线模型 极限承载力 风化砂岩 

分 类 号：TU473.1[建筑科学—结构工程]