This paper has studied deformation and failure types of the underground excavation surrounding rockmass in low ground stress state, based on a hydraulic engineering nearby a city in Northwest China.

Finite element analysis on the failure modes of the overlapped KT-type square hollow section(SHS) joints was carried out by using ANSYS program.

The failure types and influential factors of the bank slope are discussed from the point of its geological structure and stability conditions.

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.