The relation between surface crack space and stratadisplacement is presented to offer guidelines to water inflow prediction.
建立地层开裂与变形的对应关系，为突水事故的预测预报提供了依据；
2
The stability of tunnel in mining-coal induced subsidence area is a complicated problem because of the influence of tunnel excavation and stratadisplacement induced by mining.
On the basis of key rock strata theory, transferring rock beam structure and the law of the overlying stratadisplacement and the surface subsidence theory, we deduced offset error formula.