Rock Strata Control Simulation Technology章节测试课后答案2024春

第九章测试

1.According to the constitutive relation of block and joint, the attribute parameters needed for numerical calculation are determined, and the mechanical parameters of the interface between overburden rock and coal-rock stratum are determined according to the physical and mechanical test data in laboratory and field.（ ）
A:错 B:对
答案:B
2.Because the numerical simulation is carried out in computer software, there is no need to determine the density similarity ratio and stress similarity ratio.（ ）
A:对 B:错 3.When the number of layers laid by the physical similarity model reaches the surface directly, no additional force is required.（ ）
A:对 B:错 4.The geometric similarity ratio of numerical simulation is 1:1.（ ）
A:对 B:错 5.Physical similarity simulation and numerical simulation are the same in the material collection step.（ ）
A:对 B:错 6.In numerical simulation, the model boundary effect should be considered and saint Venant's principle used. （ ）
A:对 B:错 7.Horizontal stress calculation is usually expressed by multiplying the lateral pressure coefficient by （ ） when horizontal constraints are applied to the left and right boundaries of the model.
A:Gravity stress B:The tangential stress C:The vertical stress D:Principal stress 8.What factors are related to the fracture mechanism of overlying rock mass in stope （ ）.
A:Buried depth B:Coal seam thickness C:Rock lithology D:Mining method 9.Physical similarity simulation versus numerical simulation what needs to be done in the material gathering step （ ）.
A:Get a geological overview, identify the goals and problems of the simulation B:Analysis of geological conditions, obtain the comprehensive histogram of coal and rock strata C:Obtain the physical and mechanical properties of rock are through experiments D:Calculate the location of key layers, determine the number of layers and horizons for simulation 10.Physical similarity simulation determines the principles that similar materials need to follow（ ）.
A:When the ratio of mixed materials is changed, its mechanical properties can be greatly changed. B:When the similar materials are selected, the main physical and mechanical properties of the corresponding parts of the model and prototype should be similar. C:Materials should be easy to obtain, easy to manufacture, easy to lay. D:The mechanical properties of the material are stable and not easily affected by environmental changes.