1) excavation method
The relationships among deformation,stress and damaged state of surrounding rock mass of soft rock tunnel,excavation methods and supporting schemes are studied under the conditions of high geostress and low mechanical parameters of rock mass based on small strain-large deformation theory and 3D FEM.
Mechanical effect of ground and composite lining is taken as study object after the small-distance tunnels located at soft ground achieves stability by different excavation methods,and the analysis is focused on mechanical characteristics of bolt,shotcrete,secondary lining,also the influence of middle rock wall different interval on the plastic zone of middle rock wall.
Mechanics effect of ground and composite lining is taken aa study object after small - distance tunnels which are located at soft ground achieves stability under different excavation methods, and analysis is focused on mechanics characteristics of bolt, shotcrete, secondary lining, also the plastic zone influence of middle rock wall with different interval.
2) non-excavating method
3) optimum of the excavation types
4) earthwork excavation
The earthwork excavation of the foundation pit project was excavated with 3 layess with depths of-4.
5) excavating method
Finite element model for analyzing stress field of bottom hole based on excavating method;
The analysis model, excavating methods, analyzing process, and analysis options of the bottom-hole stress field are applied during the research process.
6) earth excavation
Foundation pit support and earth excavation of underground garage in a certain residential engineering;
On earth excavation and support scheme;
Comparisons on economical and optimal plans of earth excavation;
development pattern of oil and gas field:see recovery pattern of oil and gas field
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