A supervision on surface subsidence of abandoned pit in karstic district and some protective measurements

The paper present there exists great possibility of ground subsidence in abandoned pit of karstic district base on some materials from abroad and practical conditions at home.Some main factors causing ground subsidence are discussed, such as:change of ground water level, vibrating caused and loading of buildings etc.The supervision methods to ground subsidence and protective measurements to buildings are put forward, because of the indefinite subsidence time.