摘要
研究了条件高度一致情况下地连墙+锚索与地连墙+支撑的地铁车站基坑受力变形特点及规律,结果表明:钢支撑区与锚索区地表沉降数值规律相近,地表变形均呈现出与基坑距离密切相关的线性变化规律;受时间效应及工艺等因素影响,两种支护体系下的围护结构变形存在一定差异,钢支撑区墙体上部位移小于锚索区,而钢支撑区墙体最大变形明显大于锚索区;钢支撑轴力的变化与基坑开挖状态及相邻支撑架设密切相关,具有明显的时空效应。钢支撑区第一道、第二道支撑轴力变化规律表现为快速上升—快速下降—缓慢下降—快速上升四个阶段,锚索区拉力时程曲线较为平稳且数值较小,锚索拉力未得到充分发挥。
The stress and deformation characteristics of the deep excavation of subway station with diaphragm wall and anchor or diaphragm wall and strutting beam system under the same height condition were studied.The study shows that the numerical law of surface settlement in steel braced area and pre-stressed anchored area is similar,and the surface deformation presents a linear change trend closely related to the distance between the monitoring point and excavation side;under the influence of time effect and construction technique,there are some differences in the deformation of the two supporting systems;the upper displacement of the wall in the steel braced zone is less than that in the anchored zone,while the maximum deformation of the wall in the steel bracing zone is obviously greater than that in the anchor zone;the variation of axial force of steel braces is closely related to the excavation and the installation of adjacent braces,which has obvious space-time effect;the variation law of the axial force of the first and second brace beam is shown in four stages,i.e.rising rapidly,declining rapidly,declining slowly and rising rapidly;the time history curve of the tension in the anchor cable area is relatively stable and the value is small,and the tension of the anchor cable is not fully mobilized.
作者
祝建勋
杨春阳
张豫湘
郭涛
Zhu Jianxun;Yang Chunyang;Zhang Xiongya;Guo Tao(Beijing Agile-Tec Engineering Consultants Co.,Ltd.,Beijing 100050,China;National Bngineering Lab for Green and Safe Construction Technology in Urban Rail Transit,Beijing 100037,China;Beijing Rail Transit Construction Management Co.,Ltd.,Beijing 100068,China)
出处
《工程勘察》
2022年第1期1-6,共6页
Geotechnical Investigation & Surveying
基金
科技部重大专项课题(2017YFC0805408)。
关键词
钢支撑
轨排井锚索
基坑变形
监测数据
steel bracing
track shaft anchor cable
deep excavation deformation
monitoring data
