钢支撑伺服系统数值模拟计算方法研究
李恒一1何晟亚1徐海岩2,3
Numerical Simulation Calculation Method for Steel Bracing Servo System
LI HengyiHE ShengyaXU Haiyan
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作者信息:1.广州地铁设计研究院股份有限公司， 510010， 广州
2.四川省农业大学土木工程学院, 611830, 都江堰
3.四川省农业大学村镇建设防灾减灾四川省高等学校工厂研究中心, 611830, 都江堰
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Affiliation:Guangzhou Metro Design and Research Institute Co., Ltd., 510010, Guangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.12.022
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中图分类号/CLCN:TU94+2∶U231.3
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栏目/Col:研究报告
摘要:
目的：为科学给定伺服钢支撑轴力设定值，提高伺服钢支撑的技术应用水平和结构变形控制效果，特提出合理的数值模拟计算方法。方法：以深圳地铁12号线和平站基坑工程为依托，根据钢支撑伺服系统实际工作原理，提出基于双控法(地下连续墙位移和支撑轴力双控)的钢支撑伺服系统数值模拟计算方法，并通过现场监测数据验证其实用性。结果及结论：通过钢支撑伺服系统模拟计算方法确定4道伺服钢支撑的轴力设定值分别为1 500、1 700、3 200和3 000 kN，与现场监测数据所反映的数值(1 800、2 000、3 000和3 200 kN)相差不大，这说明该方法具备足够的实用性；采用传统钢支撑无法实现轴力自动补偿，变形控制效果较差，较难满足地下连续墙的微变形控制要求；采用伺服钢支撑可满足地下连续墙变形控制要求(5 mm)、桥墩位移控制要求(2 mm)、钢支撑轴力安全要求(4 400 kN)以及基底隆起控制要求(35 mm)；对于变形控制要求较严格的基坑工程，可考虑将采用伺服钢支撑作为变形控制的有效方法。
Abstracts:
Objective: To scientifically determine the set value for servo steel bracing axial force, enhance the technical application level of servo steel bracing, and improve the control effectiveness of structural deformation, a reasonable numerical simulation calculation method is proposed. Method: Leveraging the Shenzhen Metro Line 12 Heping Station foundation pit engineering, based on the actual working principle of the servo steel bracing system, a numerical simulation calculation method is proposed using the dualcontrol method (dualcontrol of underground diaphragm wall displacement and supporting axial force). The practicality of the method is validated through fieldmonitored data. Result & Conclusion: Through a simulation calculation method for the servo steel bracing system, the axial force set values for the four servo steel bracings are determined to be 1 500, 1 700, 3 200, and 3 000 kN, which closely match the values reflected in the fieldmonitored data (1 800, 2 000, 3 000 and 3 200 kN), which indicates the adequate practicality of the method. Conventional steel bracing cannot achieve automatic compensation of axial force, resulting in poor deformation control and difficulty in meeting the microdeformation control requirements of the underground diaphragm wall. The use of servo steel bracing can meet the deformation control requirements (5 mm) of underground diaphragm walls, displacement control requirements (2 mm) for bridge piers, safety requirements for steel bracing axial force (4 400kN), and control requirements for base heave (35 mm). For foundation pit projects with strict deformation control requirements, the use of servo steel bracing can be considered as an effective method for deformation control.
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