摘要
针对海域人工岛环境以及深厚抛石层叠加情况下旋喷桩成桩质量差的问题,结合深中通道东人工岛实际工程,基于工艺试验对旋喷桩施工技术展开两阶段研究,通过抽水及回水试验验证其止水效果,并优化后续围护结构形式。结果表明:采用旋挖换填+旋喷注浆结合并基于理论计算公式的喷浆提升速度动态调控的旋喷桩施工方法成桩效果显著,可有效解决抛石层浆液流失的施工难题;灌注桩+桩间止水旋喷桩的围护结构形式能够满足基坑开挖的止水需求,可取消外排止水帷幕的施工。
For the poor quality of rotary jet piles in the sea artificial island environment and the superposition of deep riprap layer,combined with an actual project of the east artificial island of the Shenzhen-Zhongshan Bridge,we carry out a two-stage study on the construction technology of rotary jet piles based on the process test to verify the water stopping effect by water pumping and recovery tests and optimize the subsequent enclosure structure form.The results show that the rotary jet pile construction method combining rotary excavation for filling and rotary spray grouting combined and adopting dynamic control of slurry lifting speed based on theoretical calculation formula is effective,which can effectively solve the construction problems of slurry loss in the riprap layer.The enclosure structure form combining infill pile and inter-pile water stop rotary jet pile can meet the water stop demand of the pit excavation and can eliminate constructing the external waterproof curtain.
作者
侯禹辰
祝阿龙
刘坤
赵永才
匡隆川
HOU Yuchen;ZHU Along;LIU Kun;ZHAO Yongcai;KUANG Longchuan(China Railway Tunnel Group Sanchu Co.,Ltd.,Shenzhen 518000,China)
出处
《水运工程》
北大核心
2023年第8期213-218,共6页
Port & Waterway Engineering
基金
中铁股份公司重大科研课题项目(20190703)
中铁隧道局重大科研课题(201824)。
关键词
深中通道
旋喷桩
抛石层
海域人工岛
施工技术
Shenzhen-Zhongshan Bridge
rotary jet pile
riprap layer
artificial island in sea area
construction technology
