长期加卸载作用下土体累积变形特性的试验与沉降计算研究  

Experimental study on cumulative deformation characteristics of soil under long-term loading and unloading and calculation of settlement

作　　者：邓政东 荣建 顾晓强[1] 周赫宸 韩凯 刘凯凯 DENG Zhengdong;RONG Jian;GU Xiaoqiang;ZHOU Hechen;HAN Kai;LIU Kaikai(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Shanghai Urban Construction Municipal Engineering(Group)Co.,Ltd.,Shanghai 200065,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]上海城建市政工程(集团)有限公司,上海200065

出　　处：《地基处理》2024年第6期557-563,共7页Journal of Ground Improvement

基　　金：国家自然科学基金(52178344)。

摘　　要：重型集装箱的长期加卸载会引起土层的累积变形,对堆场及邻近的自动起重机轨道等设施的运营和安全造成不利影响。本文以上海洋山港自动化堆场改建工程为背景,通过室内加卸载固结试验分析了集装箱长期加卸载作用下分层土体的变形特性,结合应力面积法提出了基于初次加载应变的长期加卸载作用下地基沉降预测计算公式。研究结果表明,不同幅值加卸载作用下不同类型土体累积变形的发展规律基本一致,可分为快速发展、缓慢增加和趋于稳定3个阶段,长期加卸载累积应变与初次加载应变有良好的线性关系。结合现行规范和长期加卸载作用下的沉降预测结果,对上海洋山港自动化堆场的运营提出了建议。研究结果可为类似集装箱堆场的设计优化与施工提供理论支持和工程借鉴。The long-term loading and unloading of heavy containers can cause cumulative deformation of soil layers,which has adverse effects on the operation and safety of yards and facilities such as adjacent automatic crane tracks.This paper analyzed the deformation characteristics of the storage yard at Shanghai Yangshan Port caused by containers using loading and unloading consolidation test in laboratory conditions.A long-term settlement prediction calculation formula based on the initial loading strain was proposed by combining the stress area method.The results indicate that the cumulative deformation of different types of soil under various magnitudes of loading and unloading follows a consistent development pattern,which can be divided into three stages:rapid development,gradual increase and eventual stabilization.Furthermore,a robust linear correlation exists between the long-term accumulated strain and the initial loading strain.Practical suggestions are proposed for the operation of the automated container yard at Shanghai Yangshan Port by integrating the current standards and predictions of settlement.The research findings can offer theoretical support and engineering references for the design and construction of similar projects.

关 键 词：港口堆场 长期加卸载 固结试验 累积变形 预测模型 

分 类 号：TU41[建筑科学—岩土工程]