关键词: 多煤层采空区, 稳定性分析, 注浆设计, 施工, 效果检测

Abstract: Multi-strata coal goaf belongs to concealed works.Due to its complex structure and being lack of stability，some measures should be taken if constructing new buildings especially high buildings on surface of goaf.Before governance，the feasibility for constructing was argued firstly，and based on the argumentation，reasonable design and construction were made.Combining with engineering example，some concerning issues in governance of multi-strata coal mined-out area were deeply studied.Based on the geological and mining data and using drilling detecting technology，the foundation′s stability was analyzed and assessed，and the grouting range，grouting scheme，and holes arrangement were determined.In the process of construction，such parameters as the material ratio of grout，grouting section division，grouting pressure and others were studied.Finally，grouting effect was tested with the use of drilling and geophysical technology，and the surface residual deformation parameters were estimated with probability integral method.The results showed that the grouting reached the expected target and provided guarantee for the safe operation of surface buildings.This research can be used as a reference for design and construction of similar project.

Key words: Multi-strata goaf, Stability analysis, Grouting design, Construction, Effect detection