基于位移与轴力的软土深基坑开挖扰动控制

Disturbance Control of Deep Excavation in Soft Soil Based on Displacement and Axial Force

针对软土地层基坑工程钢支撑体系压力控制液压伺服反馈控制中施工扰动最终位移的不确定性及其环境风险,研究建立了以扰动位移控制为核心、位移与支撑轴力综合优化的钢支撑液压伺服智能控制方法。提出基于容许位移约束的线性位移变化与支撑力综合优化智能控制模式,并建立相应的施工全过程实时调压技术。构建了基于高精度激光测距和液压监测同步的反馈系统,采用形函数的随机数据误差处理方法,有效防范随机误差带来的反馈控制失误和风险。经模型试验,验证了该方法的可靠性和适用性。经上海世博通道工程示范应用,位移控制效果显著。

Aiming at the uncertainty of final displacement due to construction disturbance,and its environmental risk in hydraulic servo feedback control of pressure control of steel bracing system in foundation pit engineering of soft soil layer,an intelligent control method of hydraulic servo for steel bracing,with disturbance displacement control as the core and integrated optimization of displacement and bracing axis force,is established.Based on the allowable displacement constraint,an integrated optimized intelligent control mode of linear displacement variation and support force is proposed,and the corresponding real-time pressure regulation technology for the whole construction process is established.A feedback system based on high-precision laser ranging and hydraulic monitoring synchronization is constructed,and the random data error processing method of shape function is adopted to effectively prevent the feedback control errors and risks caused by random errors.The result shows that its reliability and applicability are verified by model test.The displacement control effect is remarkable through the demonstration application of Shanghai World Expo Channel Project.