大型设备吊装换填地基承载特性的数值分析  

Numerical Analysis for Bearing Characteristics of Large-Equipment Hoisting Foundation

作　　者：郭忠 宋二祥[2] 林世杰 刘光磊 徐钰棋 付浩 童希明 焦公琦 GUO Zhong;SONG Erxiang;LIN Shijie;LIU Guanglei;XU Yuqi;FU Hao;TONG Ximing;JIAO Gongqi(Sinopec Heavy Lifting and Transportation Co.,Ltd.,Beijing 100029,China;Dept.of Civil Engineering,Tsinghua University,Beijing 100084,China;Beijing Zhongyan Dadi Technology Co.,Ltd.,Beijing 100041,China)

机构地区：[1]中石化重型起重运输工程有限公司,北京100029 [2]清华大学土木工程系,北京100084 [3]北京中岩大地科技股份有限公司,北京100041

出　　处：《工业建筑》2022年第7期137-144,214,共9页Industrial Construction

基　　金：国家973计划课题资助项目(2014CB047003)。

摘　　要：在石油化工行业大型设备吊装多采用重型履带吊车,为满足吊车站位地基承载力要求大多须对地基进行换填处理,再在地面铺设路基箱,该地基基础体系的构成以及由此决定的承载性能与建筑地基基础有着明显差别。结合某实际吊装地基处理项目通过数值模拟及实测分析研究此类地基基础体系的承载特性。首先通过实际吊装荷载下的计算和实测分析,揭示此类地基基础体系在工作荷载下的变形及荷载传递特性,并检验所构建弹塑性有限元模型的可行性。进而通过有限元计算,研究此地基基础体系的承载力安全系数,与JGJ 79—2012《建筑地基处理技术规范》简化验算结果比较表明,后者对此类地基基础的验算偏于保守。还对履带下所压路基箱是否连接、承载力计算时是否可取单侧路基箱按单基础计算、是否可用二维模型计算等问题进行了比较讨论。研究所得认识可为发展简化验算方法提供参考。In the petrochemical industry,heavy crawler cranes are often used for lifting of large equipment.In order to meet the requirements of the foundation bearing capacity for the crane,the soil replaced cushion is often employed to treat the ground and then steel tie plates are laid on the cushion underneath the crane.The composition of that soil and foundation system and consequently its bearing characteristics,are obviously different from that of buildings.Combined with a practical project of hoisting foundation treatment,the bearing characteristics of that kind of foundation system were studied through numerical simulations.Firstly,through the calculation and field measurement analysis under the actual hoisting loads,the deformation and load transfer characteristics of that kind of foundation system under the working loads were revealed,and the feasibility of the proposed elastoplastic finite element model was verified.Then,the safety factor for the bearing capacity of that foundation system was studied through finite element calculations.Comparing with the simplified checking results by Technical Code for Ground Treatment of Buildings(JGJ 79-2012),it showed that the checking calculation of that kind of foundation by the code was too conservative.It was also discussed whether the tie plates under the crane were connected,whether just one raw of the steel tie plates could be taken for the bearing capacity calculation,whether it could be calculated by a two-dimensional model.All of the above research results could provide reference to the development of simplified checking methods.

关 键 词：地基处理 换土垫层 地基承载力 有限元分析 

分 类 号：TU470[建筑科学—结构工程]