After triaxial compression tests to fissured loess samples with different features and different angle values of fissure in samples under different confining pressures,the failure characteristics are described;and deformation and failure rules are generalized by means of measuring the distortion of mesh lines and fissure marked in side face of fissured loess samples.

The failure laws of surrounding rocks and over lying bed in the steep special thickness seam mining;

The anti-blasting ability of the protective structure can be greatly enhanced by adopting composite structure with endergonic stratum in it,but the dynamic response and failure law of this composite structure was rarely researched.

This paper introduces the forms of deformation damage to high-filled embankment as well as the reasons of damage.

The paper researched the stress fields and the deformation and breakage characters of rock mass in coal seam floor under the condition of mining, which is in order to establish definite theory base to discuss inrushing water mechanism in coal seam floor.

Therefore the study of the mining condion of rock layer s deformation and breakage characteristics is depth and perfect for water inrush mechanisms and controlling which has great theoretical and practical significance.