基坑临边履带式装备动荷载对邻近建筑的响应分析OA

In order to address the issue of dynamic response in adjacent buildings induced by the moving load of ro-tary drilling rigs in urban foundation pit engineering,based on the Beijing Anli Rapid Road Reconstruction Project(the building is only 2.2 meters away from the foundation pit),the dynamic response mechanisms were systemati-cally revealed and effective control strategies were proposed by establishing a fully coupled rig-soil-building nu-merical model.The research results indicated that the dynamic response of a rotary drilling rig under moving load exhibits a three-stage characteristic of impact phase(the peak building settlement of 4.9 mm),fluctuation phase(four-cycle fluctuations matching the track vibration frequency),and attenuation phase(settlement ≤ 1 mm in 82％area),which collectively form a complete energy transfer path of"vibration-stress-deformation";A dynamic load safety threshold system was established by the code requirements(40 t/low risk,80 t/medium risk,and 120 t/high risk).When the dynamic load exceeds 40 t,the foundation vibration velocity will surpass limits by 104％-138％;An effective measure is proposed by coordinated control of"Velocity-Space".A travel speed of 1.0 m/s effectively avoids energy accumulation and mitigates the load impact,that a moving path ≥5 m reduces settlement by 80％and vibration velocity by 71％,forming a graded control strategy.The research outcomes provide a theoretical basis and practical guidance for dense urban foundation pit engineering,achieving synergistic optimization of safety and con-struction efficiency.