超厚湿陷黄土区SHR-SRC结构施工过程沉降监测与分析  

Settlement Monitoring and Analysis on Construction Processof SHR-SRC Structure in Ultra-thick Collapsible Loess Area

作　　者：宋彧[1] 罗小博 SONG Yu;LUO Xiaobo(College of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《湖南大学学报（自然科学版）》2020年第3期54-62,共9页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51468040)。

摘　　要：为真实反映超厚湿陷性黄土区超高层型钢混凝土(Super High Rise-Steel Reinforced Concrete,简称SHR-SRC)结构在施工过程中沉降特征随上部载荷的变化规律,并指导安全施工,在试验场区建立了一套完整的沉降监测体系,动态追踪测试了超高层结构在整个施工周期2年6个月内的沉降变形等原始数据.利用实际监测结果,结合ABAQUS有限元分析,对SRC结构沉降特性进行了系统分析.结果表明:施工过程中,SHR-SRC结构整体沉降较为均匀,最大沉降速率为0.28 mm/d;距离核心筒附近的地下试桩点位正、负应变值小,远处则相反;土体在施工强度平缓状况下,局部会出现短暂的"回弹"现象;模拟显示筏板底中心桩顶位移最大,边桩次之,角桩最小,同一桩产生沉降差说明桩本身存在轴向压缩;但由于黄土地基及结构受力的复杂性,相关规律需进一步分析与探讨.To truely reflect the variation law of settlement characteristics of Super High Rise-Steel Reinforced Concrete(SHR-SRC)structure with the upper load during the construction process in the ultra-thick collapsible loess area and guide the safe construction,a complete set of monitoring system was established to dynamically track testing settlement and deformation of SHR structure in the whole construction period(2.5 a)by the original data in the test area.The settlement characteristics of a SRC structure were analyzed systematically by actual monitoring results and ABAQUS finite element analysis.The results showed that the overall settlement of the SHR-SRC structure was rela-tively uniform,and the maximum settlement rate was 0.28 mm/d in the construction process.The positive and nega-tive strain values of the underground test pile near the core tube were small,but far away the core they went by con-trary.Under the condition of gentle construction intensity,local"rebound"phenomenon occurred briefly.The simula-tion showed that the largest displacement occurred at the top of the center pile at the bottom of raft,followed by the side pile,and the smallest displacement occurred at the angle pile.The settlement difference of the same pile indicat-ed that the pile itself had axial compression.However,due to the complex mechanism of the loess and the structure,the related law is still needed to be further investigated and discussed.

关 键 词：超厚湿陷性黄土 SHR-SRC结构 施工 沉降监测 原始数据 

分 类 号：TU196.2[建筑科学—建筑理论]