Deformation and stability of the seawall,considering the strength uncertainty of cement mixing piles  

作　　者：Yuansheng YU Lingling LI Xiangmiao KONG Chengyuan LI Zhen GUO 

机构地区：[1]Key Laboratory of Offshore Geotechnics and Material of Zhejiang Province,College of Civil Engineering and Architecture,Zhejiang University,Hangzhou,310058,China [2]Hainan Institute,Zhejiang University,Sanya,572000,China [3]Ninghai Highway and Transportation Management Center,Ningbo,315600,China [4]Ninghai Traffic Engineering Construction Management Institute,Ningbo,315600,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2024年第6期483-501,共19页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：supported by the Finance Science and Technology Project of Hainan Province(No.ZDKJ202019);the Key Research and Development Program of Zhejiang Province(No.2021C03014);the Natural Science Foundation of Zhejiang Province(No.LR22E080005),China.

摘　　要：The cement mixing (CM) pile is a common method of improving soft offshore ground. The strength growth of CM piles under complex conditions is affected by many factors, especially the cement and moisture contents, and shows significant uncertainty. To investigate the stochasticity of the early strength of CM piles and its impact on the displacement and stability of a seawall, a series of laboratory tests and numerical analyses were carried out in this study. Vane shear tests were conducted on the cement-solidified soil to determine the relationships between the undrained shear strength s_(u) of the cement soil curing in the seawater and the cement content a_(c), as well as the in situ soil moisture content w. It can be inferred that the 24 h undrained shear strength follows a normal distribution. A numerical model considering the random CM pile strength was established to investigate the deformation of the seawall. Due to the uncertainty of CM pile strength, the displacement of the seawall demonstrates a certain discreteness. The decrease of the mean undrained shear strength of CM piles causes a corresponding increase in the average displacement of the seawall. When the mean strength of CM piles is lower than a certain threshold, there is a risk of instability. Furthermore, the heterogeneity of the strength within an individual CM pile also has an impact on seawall displacement. Attention should be paid to the uncertainty of CM pile strength to control displacement and stability.

关 键 词：Construction uncertainty Cement mixing(CM)pile Strength of cement soil Seawall stability Random finite element method(RFEM) Monte Carlo simulation(MCS) 

分 类 号：TQ172.1[化学工程—水泥工业]