航道开挖对护岸结构影响的离心模型试验研究  

Centrifugal model test study on influence of channel excavation on revetment structure

作　　者：吴文华 安晓宇[2,3] 刘勇军[1] 杨立功 张宇亭[2] WU Wenhua;AN Xiaoyu;LIU Yongjun;YANG Ligong;ZHANG Yuting(Huzhou Port and ShippingManagement Center,Huzhou 313000,China;National Engineering Research Center of Port Hydraulic Construction Technology,Tianjin Research Institute for Water Transport Engineering,Tianjin 300456,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)

机构地区：[1]湖州市港航管理中心,浙江湖州313000 [2]交通运输部天津水运工程科学研究所,港口水工建筑技术国家工程研究中心,天津300456 [3]天津大学,水利工程仿真与安全国家重点实验室,天津300072

出　　处：《水运工程》2024年第7期232-238,共7页Port & Waterway Engineering

基　　金：中央级公益性科研院所科研创新基金项目(TKS20230107)。

摘　　要：为了研究航道开挖对新老护岸结构的影响,依托东宗线航道四改三工程,利用大型土工离心模型试验平台研究航道开挖对老挡墙护岸结构、新施工钢板桩的受力和变形特征的影响,得出航道开挖过程中板桩两侧土压力的分布规律。结果表明,随开挖深度增加,靠岸侧(主动侧)土压力逐渐减小;受板桩位移、变形及离心模型试验重液影响,临水侧(被动侧)土压力部分减小,底部土压力增大。开挖卸载导致老挡墙呈现向水侧移动且向后翻转的趋势。设计工况的极限开挖深度约为3.6 m,此时钢板桩顶部帽梁的水平位移达到0.069 m;对于6、8和10 m 3种长度的板桩,其极限开挖深度约为0.5~0.6倍桩长,且随着桩长增加极限开挖深度逐渐降低。研究得出不同板桩长度下开挖深度的阈值,可为工程建设提供技术参数。To study the influence of channel excavation on the new and old revetment structure,the influence of channel excavation on the force and deformation characteristics of old retaining wall and newly constructed steel sheet pile is studied by using a large-scale geotechnical centrifugal model test platform based on 4-to-3 project of Dongzong Channel,and the distribution law of soil pressure on both sides of the sheet pile during channel excavation is obtained.The results show that with the increase of excavation depth,the earth pressure on the bank side(active side)decreases gradually,and the earth pressure on the water side(passive side)partly decreases under the influence of sheet pile displacement,deformation and heavy liquid of centrifugal model test,the earth pressure increases at the bottom.The excavation unloading causes the old retaining wall to move to the water side and turn backward.The limit excavation depth of the design condition is about 3.6 m,and the horizontal displacement of the cap beam at the top of the steel sheet pile reaches 0.069 m.For sheet piles with 3 lengths of 6,8 and 10 m,the limit excavation depth is about 0.5-0.6 times the pile length,and the limit excavation depth gradually decreases with the increase of pile length.The threshold values of excavation depth under different sheet pile lengths are obtained,which can provide technical parameters for engineering construction.

关 键 词：航道 板桩 挡墙 离心模型试验 

分 类 号：U615[交通运输工程—船舶及航道工程]