摘要
基于某海上人工岛基坑工程实例,在地质条件复杂、潮差水位变动剧烈、边界土体透水性大的工程条件下,提出基坑单边和多边设置止水帷幕的防渗方案。采用ANSYS软件建立三维渗流计算模型,分析各方案在不同工况下的渗流流速、流量和渗透坡降。研究表明,在海侧和内河道围堰设置止水帷幕,能有效减少坑内涌水量和边坡渗透坡降,实现安全稳定、造价最优的防渗效果。此海上人工岛基坑防渗方案可为类似工程的设计和施工提供参考。
In combination with an excavation project in an artificial offshore island, we proposed the anti-seepage schemes by setting waterproof curtains on unilateral and multilateral boundaries under the conditions of complicated geology, drastic changes in tide level, and large permeability of soils. The three-dimensional finite element numerical models are established by ANSYS to study the seepage velocity, flow and hydraulic gradient under different calculation conditions. The calculated results show that the flow and hydraulic gradient can be reduced significantly to meet the safety and economic requirements by setting waterproof curtains in the seaside and inner-river side cofferdam. The proposed anti-seepage scheme can also provide a guideline for similar engineering designs and constructions.
出处
《中国港湾建设》
2017年第1期33-37,共5页
China Harbour Engineering
关键词
人工岛
基坑
防渗
数值模拟
流速
流量
渗透坡降
artificial offshore island
excavation
anti-seepage
numerical simulation
seepage velocity
flow
hydraulic gradient
