To solve the traditional judgments difficulties of the ascending mining, the relationship between the ascending mining and the overlying strata of upper coal seam was expatiated, based on the analysis of the mechanism of ascending mining and the traditional main factors that influence it.

Analysis on the mechanism of the face-contacted blocks structure in overlying strata above the longwall face;

Analysis on the damage zone of overlying strata and safety layer distance on the upward mining above the longwall goaf

Based on the experiment with similar material,the laws of the extra subsidence on the surface and the stress vary inside overlying strata by newly increased load on the surface above worked-out area formed by fully mined and partial mined were researched.

Underground coal seam mining,stope roof caving,overburden subsidence,destruction and even surface settlement is a entire process,a unified system.

The casing deformation caused by sand production of unconsolidated sandstones and caving of the overburden is studied .

In order to investigate the surface borehole drilling affected to the released gas drainage from the overburden remote distance seam,with the site experiment on the surface borehole drilling and released gas drainage in Huainan Panji No.

This paper introduces the method of determining overburden pressure by using density logging data.

There are certain relations among overburden pressure,underlying fluid pressure and matrix stress,and different understandings of how to describe or depict them in the end.

This paper aims at the question that the carbonate fonnation pressure is relatively difficult to predict, proposes estimating formation fracture pressure new method in carbonate profile by using pseudo overburden pressure method, discusses how to establish pseudo overburden pressure model in carbonate profile, and determine the parameter of model .