摘要
雪花形桩是一种新型异形桩,具有桩土接触面积大、单桩承载力高和材料用量少等优点.为了研究雪花形桩的挤土效应,开展了雪花形桩挤土效应室内模型试验,利用3D打印技术制备了雪花形桩模型,制作了土体水平位移监测装置,采用光频域反射(OFDR)技术,监测了雪花形桩沉桩过程中土体水平位移监测装置的应变,并计算得到了桩周土体水平位移,对雪花形桩的挤土效应引起的土体位移进行了分析.试验结果表明:土体水平位移监测装置最大应变发生位置随着雪花形桩沉桩深度的增加而下移,随着离沉桩中心距离的增加而上移;桩周土体水平位移随着沉桩深度的增加而增大,随着离沉桩中心距离的增加而减小,呈现上大下小的趋势.
Snowflake-shaped pile is a new type of special-shaped pile,which has the advantages of large pile-soil contact area,high bearing capacity of single pile and less material consumption.In order to study the compacting effect of snowflake-shaped pile,the indoor model test of the compacting effect of snowflake-shaped pile is carried out.The snowflake-shaped pile model is made by 3D printing technology.The soil lateral displacement monitoring device is developed.The optical frequency domain reflectance(OFDR)technology is used to monitor the strain of the soil lateral displacement monitoring devices during the sinking process of snowflake-shaped pile.The lateral displacement of the soil around the pile is calculated.The soil displacement caused by the compacting effect of snowflake-shaped pile is analyzed.The results show that the maximum strain occurrence position of the soil horizontal displacement monitoring device moves down with the increase of the driving depth of snowflake-shaped pile,and moves up with the increase of the distance from the pile driving center.The soil horizontal displacement around the pile increases with the increase of the pile driving depth,and decreases with the increase of the distance from the pile driving center,which shows the trend that the upper is larger and the lower is small.
作者
高磊
钱继奔
徐中权
陈和进
袁泽
GAO Lei;QIAN Jiben;XU Zhongquan;CHEN Hejin;YUAN Ze(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China)
出处
《河南科学》
2022年第5期732-738,共7页
Henan Science
基金
国家自然科学基金(52027812)
中央高校基本科研业务费专项资金资助(B210202047,B210204020)。
关键词
雪花形桩
挤土效应
土体水平位移
光纤监测
模型试验
snowflake-shaped pile
compacting effect
lateral displacement of soil
optical fiber monitoring
model test
