饱和黏土中静压沉桩模型试验及数值模拟研究  

Static pressure pile-sinking model tests and numerical simulation on saturated clay

作　　者：钱峰[1] 刘干斌[1] 齐昌广[1] 范高飞 QIAN Feng LIU Ganbin QI Changguang FAN Gaofei(Institute of Geotechnical Engineering, Ningbo University, Ningbo ,Zhejiang 315211, China)

机构地区：[1]宁波大学岩土工程研究所,浙江宁波315211

出　　处：《水文地质工程地质》2016年第5期56-61,69,共7页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目资助(51278256;51178227)

摘　　要：通过饱和黏土中静压沉桩模型试验,模拟了预制混凝土桩的施工过程,重点监测了孔隙水压力、桩侧土压力、地面隆起量随桩的贯入深度和距桩轴不同距离的变化规律。结果表明:在沉桩过程中,测点处超孔隙水压力的最大值发生在桩端到达该点上方约0.8 d处(d为桩的直径);距桩轴相同距离处,离桩端越近,挤土压力越大;每一级沉桩时地面隆起总量呈指数递减。采用ABAQUS软件对沉桩过程进行数值模拟,并与模型试验结果进行对比。Model tests of a driven pile jacked into the saturated clay are used to simulate the construction process of the precast concrete pile. The variation in pore water pressure, lateral earth pressure, land upheaval with pile penetration depth and distances from the pile are main monitored. The results show that the excess pore pressure is up to its maximum when pile tip is 0.8 pile diameter above the measuring point during the pile driving, and the lateral earth pressure increases with the reducing distance from the pile tip, and the amount of land upheaval exponentially decrease during the per level pile driving. The whole pile driving process is simulated by the ABAQUS software and compared with the model experiment results.

关 键 词：饱和黏土 静压沉桩 模型试验 数值模拟 

分 类 号：TU473.1[建筑科学—结构工程]