Review on stability and deforma tion prediction of ground base underlying multi-layer goaf in Mentougou area

The underground underlies multiplayer goaf with the development of the coal mining from shallow work to deep mining. The stability of ground base underlying multi-layer goaf is a significant problem for the construct program on the ground base. The renovation project of Shantytown or slum of Mentougou borough in Beijing is an example. Based on the investigation and the indoor test, the stability is depended on the unbroken supporting rock which protects the ground base from subsidence. Using the probability integration method, the ground subsidence is calculated considering the effect of chance of mining depth, mining thickness, coal bed pitch, sharp, the time of mine, and rock tensile strength. According to the result of the subsidence, the appraisal of the ground partition with different stability is taken. The guiding and theoretical suggestion is given for the project after the research.