船闸深基坑开挖对桥桩边坡应力的影响  

Influence of ship lock deep foundation pit excavation on slope stress of bridge pile

作　　者：王志鹏[1,2] 曹周红 祝伟程[1] 彭云溪 WANG Zhi-peng;CAO Zhou-hong;ZHU Wei-cheng;PENG Yun-xi(School of Hydraulic Engineering,Changsha University of Science&Technology,Changsha 410114,China;Jiangxi Provincial Port&Waterway Construction Investment Group Co.,Ltd.,Nanchang 330008,China)

机构地区：[1]长沙理工大学水利工程学院,湖南长沙410114 [2]江西省港航建设投资集团有限公司,江西南昌330008

出　　处：《水运工程》2019年第3期146-153,共8页Port & Waterway Engineering

基　　金：国家自然科学基金资助项目(51309037);湖南省教育厅优秀青年项目(16B009)

摘　　要：为研究某船闸基坑开挖对桥梁桩基边坡应力的影响,进行了土工离心模型试验,分析得到了基坑开挖越深桩两侧土压力的差值越大、桩顶水平位移也随之增大的结果。采用ABAQUS有限元软件进行数值模拟分析,计算结果表明:基坑开挖过程桥桩朝基坑方向产生水平位移,右侧桩身受拉越来越明显,桩身应力及弯矩数值也越来越大,最大拉应力值达到了3. 61 MPa,大于桩体混凝土抗拉强度标准值。采取了开挖桩体右侧的上部土体反压在坡脚并结合排桩支护的加固措施,取得了良好的加固效果。In order to study the influence of ship lock deep foundation pit excavation in the stress of bridge pile on the slope,the geotechnical centrifuge model test was carried out.The results showed that the deeper the foundation pit excavation was,the greater the difference of soil pressure between the two sides of the pile was,and the horizontal displacement of pile top also increased.ABAQUS finite element software was used for numerical simulation analysis,and the calculation results showed that the horizontal displacement of the bridge pile towards the direction of the foundation pit was generated in the excavation process.The tensile force of the right pile was becoming more and more obvious,and the pile stress and bending moment were becoming larger and larger.The maximum tensile stress reached 3.61 MPa,which was greater than the standard tensile strength of pile concrete.Upper soil mass on the right side of the excavated pile was pressed at the foot of the slope,and the reinforcement measures of pile row support were taken.Good reinforcement effect was obtained.

关 键 词：船闸 基坑 桩基 离心试验 数值模拟 

分 类 号：U641[交通运输工程—船舶及航道工程] TU47[交通运输工程—船舶与海洋工程]