华东交通大学学报2023，Vol.40Issue(6)：8-16,9.
泥浆含砂量及静置时间的顶管摩阻力模型试验
Model Test of Pipe Jacking Friction with Sand Content of the Slurry and Resting Time
摘要
Abstract
In response to the problems that the sandy soil in the water-rich sand layer is prone to collapse,re-sulting in the weakening of bentonite slurry friction reduction effect and the increasing jacking force caused by construction halt during the restart,a series of pipe-jacking model tests are conducted to investigate the influ-ence of different mud sand content and different resting time on the effect of mud drag reduction and the chang-ing characteristics of pipe jacking force.The results show that as the sand content of the mud increases,the fric-tion between the pipe jacking and the mud interface increases exponentially.The pure slurry can reduce the friction force by 90%.When the sand content of the slurry is less than 20%,the sand content has little effect on the friction reduction effect,and the friction reduction effect is only reduced by 5%.With the increase of sand content in slurry,the effect of resting time on friction force between jacking pipe and slurry interface increases.When the sand content of the slurry is less than 60%,the residual jacking force of the pipe-soil interface is not relevant to the resting time.When sand content reaches 80%,the residual friction strength increases about 6%to 8%after 24 h resting.关键词
顶管/触变泥浆/减阻效果/含砂量/静置时间/模型试验Key words
pipe jacking/thixotropic slurry/friction reduction effect/sand content/resting time/model tests分类
建筑与水利引用本文复制引用
罗如平,胡茗鹭秋,朱碧堂,王安辉,闫文铠..泥浆含砂量及静置时间的顶管摩阻力模型试验[J].华东交通大学学报,2023,40(6):8-16,9.基金项目
国家自然科学基金项目(41972291,52208343) （41972291,52208343）
江苏省自然科学基金项目(BK20210051) （BK20210051）
