变幅水位影响下高填方岸坡框架码头结构承载特性研究

doi:10.3969/j.issn.1674-0696.2023.07.11

摘要/Abstract

摘要： 库区周期性变幅水位引起高填方岸坡土体抗剪强度参数发生弱化，进而导致框架码头结构稳定性降低，因此有必要开展变幅水位条件下高填方岸坡框架码头结构承载特性研究。首先，基于已建立的变幅水位下岸坡稳定性简化计算方法，考虑土体饱和度与水位循环次数对土体强度参数的影响规律，建立了考虑渗透力、土体饱和度及变幅水位循环次数综合影响下的码头结构承载特性简化分析方法。然后，借助ABAQUS有限元软件，建立了高填方岸坡框架码头结构三维有限元计算模型，并将建立的方法应用于某实际码头工程承载特性分析。结果表明：饱和度、变幅水位循环次数与渗透力的共同作用对岸坡框架码头竖向承载能力影响并不明显，然而饱和度及水位循环次数的增加略微增大了码头结构水平向极限承载能力，撞击荷载作用下，岸坡土体饱和度为90%比饱和度为14%时码头结构水平极限承载力增加了6.4%，水位循环100次比水位循环1次时水平极限撞击能力增加了3.3%；考虑渗透力后饱和度及水位循环次数的变化对岸坡土体位移影响较大，其中岸坡塑性贯通区及位移变化最大区域集中在坡顶挡土墙下方与岸坡第1排、第2排桩基土体周围。

关键词: 港口工程；变幅水位；框架码头结构；水位循环次数；土体饱和度

Abstract: The periodic variable amplitude water level in the reservoir area causes a weakening of the shear strength parameters of the high-filled bank slope soil, which in turn causes a decrease in the stability of the frame dock structure. Therefore, it is necessary to carry out the study on bearing characteristics of the frame wharf with high-filled bank slope under the influence of variable amplitude water level. Firstly, based on the simplified calculation method established for bank slope stability under variable amplitude water level, and considering the influence rule of soil saturation and water level cycles on soil strength parameters, a simplified analysis method for the bearing characteristics of wharf structures was established considering the comprehensive effects of permeability, soil saturation, and variable amplitude water level cycles. Then, with the help of ABAQUS finite element software, a three-dimensional finite element calculation model for the high-filled slope frame wharf structure was established, and the bearing characteristics of an actual wharf engineering were analyzed by applying the proposed method. The results show that the combined effect of saturation, variable amplitude water level cycles, and permeability on the vertical bearing capacity of the slope frame wharf is not significant. However, the increase in saturation and the number of water level cycles slightly increases the horizontal ultimate bearing capacity of the wharf structure. Under the impact load, the horizontal ultimate bearing capacity of the wharf structure with 90% saturation of the soil increases by 6.4% compared with that with 14% saturation of the soil, and the horizontal ultimate impact capacity when water levels are cycling 100 times increases by 3.3% compared with that when the water levels are cycling one time. The changes in saturation and water level cycles after considering the permeability have a significant impact on the displacement of the bank slope soil. Among them, the plastic penetration zone of the bank slope and the area with the largest displacement change concentrate below the retaining wall at the top of the slope and around the first and second rows of pile foundation soil of the bank slope.The relevant research results can provide a certain reference for similar engineering designs.

Key words: port engineering; variable amplitude water level; frame wharf structure; cycle times of water level; saturation of the soil

中图分类号:

U656.1
TV62

贺林林1，2，3，李志松1，赵陈雨1，钱进1. 变幅水位影响下高填方岸坡框架码头结构承载特性研究[J]. 重庆交通大学学报（自然科学版）, 2023, 42(7): 76-86.

HE Linlin1,2,3, LI Zhisong1, ZHAO Chenyu1, QIAN Jin1. Bearing Characteristics of the Frame Wharf Structure with High-Filled Bank Slope under the Influence of Variable Amplitude Water Level[J]. Journal of Chongqing Jiaotong University(Natural Science), 2023, 42(7): 76-86.

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