Stability analysis and numerical simulation of foundation in old goaf under building load

This study comprehensively analyzes the safety and stability of old goaf under construction engineering based on specific projects using a variety research methods. The Beijing Mentougou mining area is used as background. methods field investigation, laboratory testing, drilling, geophysical exploration, theoretical calculation, numerical simulation are combined to quantitatively analyze foundation ground buildings in goaf. influence depth building load height caving crack zone calculated “three-zone theory” judge if at risk activation. Further conducted two types finite element analysis software, which increases reliability analysis. results demonstrate that uneven subsidence approximately 100 mm occurs surface, 50 roof. It also proven affects surrounding rock foundation. Finally, treatment scheme proposed. effect found be remarkable through tests simulations, ensuring combination calculation can effectively evaluate project load, has strong promotion application value. meet needs practice, provide great reference value for rational utilization land above district similar cities, good significance prospect.