桩土界面超孔压和应力变化规律试验和数值模拟研究  

Experimental and Numerical Simulation Study on the Variation Law of Excess Pore Pressure and Stress at Pile-Soil Interface

作　　者：秦利波 Qin Libo

机构地区：[1]中铁十八局集团第一工程有限公司,河北涿州072750

出　　处：《辽宁省交通高等专科学校学报》2024年第2期37-41,共5页Journal of Liaoning Provincial College of Communications

摘　　要：为揭示黏土地区成桩后桩土界面超孔隙水压力和竖向有效应力的时空分布特征,本文依托岭南师范学院第五教学实训楼项目,进行了现场试验和数值模拟研究,并将数值计算结果与试验结果进行了对比。结果表明:竖向有效应力、孔隙水压力和超孔隙水压力的变化规律受传感器位置影响较为显著,传感器位置越靠近桩端数值越大。孔隙水压力变化特征受土层性质影响,当桩体位于粉质黏土层时,桩端孔压增幅更小。桩端位置处的超孔隙水压力峰值达到了25kPa,桩顶位置处超孔隙水压力始终保持在0附近。桩土界面的超孔隙水压力和竖向有效应力数值模拟结果与试验结果数值大小和随时间变化规律基本一致,验证了本文建立的桩基数值模型的有效性。In order to reveal the temporal and spatial distribution characteristics of excess pore water pressure and vertical effective stress at the pile-soil interface after piling in clay area,based on the fifth teaching and training building project of South Normal University,it is carried out field tests and numerical simulation studies,and compared the numerical calculation results with the experimental results.The results show that the changes of vertical effective stress,pore water pressure and excess pore water pressure are significantly influenced by the sensor position,and the closer the sensor position is to the pile end,the greater the value is.The change characteristics of pore water pressure are influenced by the soil properties.When the pile is in silty clay layer,the pore water pressure at the pile end increases less.The peak value of excess pore water pressure at the pile tip reaches 25kPa,and the excess pore water pressure at the pile top always stays near O,and the peak value of excess pore water pressure.The numerical simulation results of excess pore water pressure and vertical effective stress at the pile-soil interface are basically consistent with the experimental results,and the variation law with time verifies the effectiveness of the numerical model of pile foundation established in this paper.

关 键 词：超孔隙水压力 竖向有效应力 现场试验 数值模拟 

分 类 号：TU473[建筑科学—结构工程]