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Rock Strata Control Simulation Technology
- The similarity criterion can be determined by using π theorem through dimensional analysis.（ ）
- In order to meet the need of studying inclined strata simulation experiment, the plane rotating model frame should be used.（ ）
- UDEC is well suited for studying potential failure modes that are directly related to discontinuous characteristics.（ ）
- If the simulation is located in the deep underground space, the model height is not enough to simulate the full buried depth, so it needs to be loaded at the top of the model.（ ）
- According to the third theorem of similitude, we can point out the rules that must be obeyed in doing model experiments.（ ）
- For the actual geological structure, the joints are virtual and their existence should not affect the calculation results of the model.（ ）
- If the simulated prototype is composed of multiple layers of rock, the strength index of the simulated rock should be calculated layer by layer.（ ）
- The measurement accuracy of the dial indicator method is not high, more time and manpower are needed when the multi-point measurement is arranged.（ ）
- The mining process of the model in the test can be understood as the process of moving the powered support at the working face and the process of coal caving.（ ）
- For deformed blocks, the maximum fillet length should not exceed 1% of the average edge length of the block.（ ）
- A simple model can reveal some problems so that they can be amended before in-depth analysis.（ ）
- Mica powder can increase the thermoconductivity of the materials.（ ）
- When the physical similarity model does not need to be laid to the surface, an external load is applied to the model to replace the dead weight of the upper strata.（ ）
- Numerical analysis methods mainly include analysis of certainty methods and analysis of uncertainty methods.（ ）
- Numerical simulation is carried out in computer software without the need for real simulation materials, so there is no need to determine density similarity ratio, stress similarity ratio.（ ）
- Which of the following is not a feature of similar simulation （ ）.
- The engineering structure shape is formed by cutting the UDEC block, which needs to be carried out before the excavation of the project. （ ） commands are typically used to generate shapes.
- With the enhancement of the consciousness of environmental protection and the concept of sustainable economic development, the green mining technology of coal mine is proposed, which does not include （ ）.
- The clay material diameter of （ ） is suitable.
- The necessary and sufficient condition for phenomenon similarity is （ ）.
- Cons=（ ） means that the model block material is removed or excavated.
- Which of the following is wrong about UDEC? （ ）
- There is no constraint before and after the model, and lateral deformation is allowed.（ ）
- Which of the following is not a feature of discrete element method? （ ）
- （ ）, designed and developed by institute of Mining Technology, Taiyuan University of Technology, can be used for solid-flow coupling simulation experiment.
- Its v value defines the （ ） of the triangular element, namely, the smaller the v value is, the smaller the element in the block is.
- The （ ） code for horizontal and vertical stress curves is as follows.
- Which of the following does not belong to physical similarity （ ）.
- Similar simulation is in the indoor use of some artificial materials, according to the similarity principle to make a similar model, the model is based on the （ ） to shape.
- In order to meet the needs of studying inclined strata simulation experiment, （ ） should be used.
- Which of the following is not the advantages of the finite element method?（ ）
- Other keywords （ ） relative to the JSET command can also be used to restrict blocks from being cut.
- The element composition of PFC model (2D) contact property does not include .（ ）
- Model layers can be simulated by spreading a layer （ ） between layers.
- print plin 1 ydisp；In the y direction（ ）.
- UDEC/3DEC Application Field （ ）
- Which of the following is aggregate （ ）
- In the simulation study of rock layer control, the simulation experiment can play the following roles:（ ）.
- Which of the following are boundary conditions （ ）.
- Which of the following are correct （ ）
- Artificial boundary classification includes:（ ）
- The most commonly used models for deformed blocks in UDEC are as follows:（ ）
- The chemical composition of groundwater is generally（ ）
- Physical similarity simulation determines the principles that similar materials need to follow（ ）
- Which of the following are the basic units of quality system dimension （ ）
- Numerical simulation technology commonly used numerical calculation methods are mainly:（ ）
- Parameters required for joint properties are:（ ）
- Functions of numerical simulation research:（ ）
- The following similarity theory is （ ）.
- Which of the following are drawbacks of dioramas （ ）
A:错 B:对
答案:invariant
A:对 B:错
答案:Ask for client’s input about the treatment planAI参考:判断题答案为：对。为了满足研究倾斜岩层模拟实验的需求，应使用平面旋转模型框架。因此，这个说法是正确的。'
A:对 B:错
AI参考:答案是B：错。UDEC（Unified Digital Engine）是一个用于模拟和测试电子系统的软件平台，它主要用于研究连续系统及其相关的问题，而不是直接与间断特性相关的潜在故障模式。因此，它并不适合用于研究与间断特性直接相关的潜在故障模式。'
A:对 B:错
答案:3.Printing zoneAI参考:正确答案是B：错。如果模拟位于深地下空间，模型的高度不足以模拟完全埋藏深度，因此需要在模型顶部加载。所以选项B是错误的。'
A:对 B:错
AI参考:对。根据第三相似定理，我们可以指明模型实验中必须遵守的规则。因此，这个判断题的答案是A，即“对”。'
A:错 B:对
答案:错误AI参考:【对】在地质结构中，节理是虚拟的，它们不存在应不影响模型计算结果。'
A:对 B:错
答案:multimetersACpower;ACsupplyinductorsinterconnectionvoltagestest instrumentmeasureelectricityAI参考:答案：B：错。根据题目描述，如果模拟原型由多层的岩石组成，那么强度指标应该逐层计算。但实际上，对于模拟岩体的强度指标计算，通常需要考虑整个岩体的完整性、应力状态等因素，不能只按照层进行计算。因此，该说法是不正确的。所以，最终答案为B。'
A:错 B:对
AI参考:正确答案是B:对。刻度指示器的测量精度不高，多点测量时需要更多时间和人力。因此该说法是正确的。'
A:对 B:错
A:对 B:错
A:对 B:错
A:对 B:错
A:对 B:错
A:错 B:对
A:错 B:对
A:Take a long time B:Experimental simulation can obtain the research results quickly C:According to the results of model experiment，the stability and safety degree of mining engineering can be inferred D:Intuition
A:four B:One C:two D:three
AI参考:正确答案是C:two。根据题目中的描述，工程结构形状是通过切割UDEC块形成的，这个过程需要在项目开挖之前进行。因此，需要使用两个命令来生成形状。选项A、B、D都少于两个，不符合题意。因此，答案为C。'
A:Advanced support technology B:Water conservation mining technology formed by water resources protection C:Co-mining technology of coal and gas formed by gas drainage D:Coal seam roadway support and coal seam mining technology
A:0.35 mm B:0.39mm C:0.37mm D:0.32mm
AI参考:正确答案是C，0.37mm。根据题目描述，需要选择适合的粘土材料直径，选项中只有C符合要求，因此答案为C。'
A:The Third Similarity Theorem B:the second similarity theorem C:Dimensional analysis D:The First Theorem of Similarity
AI参考:正确答案是D:The First Theorem of Similarity。现象相似的必要充分条件是第一相似定理。因此，正确答案是D。'
A:1 B:2 C:3 D:0
AI参考:正确选项：D.0根据题目描述，Cons=0意味着模型块材料被移除或挖掘。因此，选项D为正确答案。其他选项A、B、C不符合题目要求和描述。'
A:Blocks in UDEC can be deformable B:UDEC can be used in military activities C:Blocks in UDEC can be rigid D:The UDEC calculation preparation process is complex
A:swivel model frame B:three-dimensional model frame Plane C:stress model frame D:Plane strain model frame
A:The explicit integral iterative algorithm allows large displacement and rotation B:The discrete element method can use various nonlinear models to describe the contact between blocks or particles C:The interaction of the boundary between blocks can reflect the characteristics of discontinuity and joint D:Not much in the field of application
AI参考:选项D：“在应用领域方面没有什么特别的”。这是离散元方法的一个非特性。离散元方法是一种广泛应用于工程领域的数值模拟方法，它能够模拟块或颗粒之间的接触、非线性模型、边界交互等特性。然而，选项D并没有描述这些特性，只是简单地陈述了它在应用领域方面没有什么特别的。因此，正确答案是选项D。'
A:Three-dimensional model frame Plane B:Stress model frame C:Swivel model frame D:Plane strain model frame
AI参考:正确答案是【D:Plane strain model frame 】。这个选项表明“平面应变模型框架”被太原科技学院矿业技术研究所设计开发，可用来进行固体流耦合模拟实验。'
A:The minimum area B:The minimum length C:The most widespread D:The largest length
AI参考:正确答案是A：The minimum area。三角形元素的最小面积由其v值定义，即v值越小，三角形元素在块中越小。因此，选项A“最小面积”是正确答案。选项B“最小长度”、选项C“最普遍”和选项D“最大长度”都不符合题意。'
A:lae B:log C:lug D:lag
AI参考:正确选项是【D:lag】。lag表示滞后，是用于表示水平与垂直应力曲线的代码。其他选项A、B、C都不符合题意。'
A:Bulk density B:length C:time D:speed
AI参考:正确答案是C:time。物理相似是指不同物体的体积、重量、长度等特征与相同物体的物理属性之间保持某种特定的比例关系。而选项C“时间”与其它选项不属于物理相似范畴，因为它是一种主观的概念，不能作为衡量物体物理属性的标准。因此，答案为C。'
A:Existing material B:The simulated prototype C:Conditions of the test site D:The role of models
AI参考:正确答案是A：Existing material。\r根据相似原理制作相似模型，模型是依据现有的材料来塑造的。因此，答案为A。B、C、D选项都与模型制作没有直接关系。'
A:Plane strain model frame B:three-dimensional model frame Plane C:stress model frame D:swivel model frame
AI参考:正确答案是【Plane strain model frame】选项。选项A的意思是平面应变模型框架，可以用于模拟倾向层流剪切层分层的流动机理。模拟实验是利用该框架满足对特定倾斜层的需要，即对斜层流进行剪切流动实验时需要平面应变模型框架来满足其要求。选项B和C不准确，而选项D则是倾转模型框架，不能满足对倾斜层流模拟实验的需求。因此，正确答案是平面应变模型框架。'
A:It can be meshed directly on the mechanical model B:Good at handling rigid and flexible contact problems C:has good adaptability D:the physical concept is clear and easy to understand
AI参考:选项D：the physical concept is clear and easy to understand is not an advantage of the finite element method。这是因为有限元方法是一种数学方法，主要应用于工程分析中，其主要优点是可以直接在机械模型上划分网格，并且对于处理刚性和柔性接触问题、适应性问题等具有很好的效果，但是物理概念并不清晰易懂。因此选项D是有限元方法的一个缺点。'
A:crack B:block C:delete D:range
AI参考:正确答案是D:range。这个选项“range”可以与JSET命令相关的其他关键词一起使用，以限制被剪切的块的范围。其他选项A、B、C与题意不符。因此，答案为D。'
A:Bond type B:Linear springs C:Displacement increment D:Coulomb slider
AI参考:正确答案是【B:Linear springs】。PFC模型（2D）接触属性不包括线性弹簧（B选项）。PFC模型是一种用于模拟固体接触的有限元方法，它可以模拟两个物体之间的摩擦、弹性和塑性变形等。在PFC模型中，元素组成包括元素类型、质量、密度等，而接触属性包括摩擦系数、恢复力、接触刚度等，不包括线性弹簧。因此，选项B是正确答案。选项A、C、D都与PFC模型的接触属性有关，但不是选项B所描述的内容。'
A:asphalt B:Lime powder C:Sand D:mica powder
A:pressure B:speed C:displacement D:stress
A:The geotechnical engineering B:Agriculture, forestry and engineering C:Earthquake engineering D:Military engineering
AI参考:正确选项为B：Agriculture, forestry and engineering。 根据问题中的信息，UDEC/3DEC应用领域包括农业、林业和工程，选项A中的“地质工程”并不是一个常见的应用领域，选项C中的“地震工程”可能涉及，但也不是唯一的重点，选项D中的“军事工程”与问题中的信息无关。因此，选项B“农业、林业和工程”是最符合问题中提到的UDEC/3DEC应用领域的选项。
A:cement B:Sand C:Broken sawdust D:Lime
AI参考:正确选项是【C:Broken sawdust】。 根据问题中的选项，它们都是建筑材料，其中A选项是水泥，B选项是沙子，D选项是石灰。但是只有C选项是碎木屑或锯末等混合物，符合建筑材料的定义。因此，C选项是正确的答案。
A:To provide reference data for the industrial test of new technology, new technology and construction technology B:It can solve all the design and construction problems in mining engineering C:It helps to solve some rock mass pressure problems which cannot be solved by theoretical methods at present D:Assist the study of in-situ rock mass stress measurement
A:stress B:Poisson’s ratio C:displacement D:geometric dimension
AI参考:正确选项是【C:displacement】。 边界条件是指物体在特定约束条件下所受到的力和力矩，这些条件决定了物体的运动和变形。选项A中的应力（stress）和选项D中的几何尺寸（geometric dimension）都是物体受到的外力或外力矩，属于物体受力方面的边界条件。选项B中的泊松比（Poisson’s ratio）是材料在受到应力时的变形性质，不属于边界条件。选项C中的位移（displacement）是指物体在受到外力作用后发生的相对位置变化，是物体运动方面的边界条件之一。因此，选项C是正确的边界条件答案。
A:The finite difference method is an approximate numerical solution which directly transforms the differential problem into an algebraic problem. B:The boundary element method is better than the finite element method for stress concentration problems C:The boundary element method originated in the early 19th century D:Finite element method can simulate the solution domain of complex geometry
A:coordinate B:intercepted boundary line C:symmetry axis D:hyperbolic
A:cons=3；jtension model B:cons=3 ; Mohr-coulomb model C:cons=1 ; elastic model change D:change cons=0; null model change change
AI参考:正确答案是【B:cons=3 ; Mohr-coulomb model】。 在UDEC中，用于处理变形块的最常用模型如下：cons=3; Mohr-coulomb model（B选项）。该模型考虑了岩石的强度条件和破坏准则，适用于处理复杂的岩土工程问题。其他选项中，A选项是con=3时的拉伸模型，C选项是弹性模型变化，D选项是改变cons=0时的空模型变化，它们都不是用于处理变形块的最常用模型。
A:radioactive elements B:major ions C:biological products D:dissolved gases
A:When the similar materials are selected, the main physical and mechanical properties of the corresponding parts of the model and prototype should be similar B:When the ratio of mixed materials is changed, its mechanical properties can be greatly changed C:The mechanical properties of the material are stable and not easily affected by environmental changes D:Materials should be easy to obtain, easy to manufacture, easy to lay
A:[L] B:[M] C:[T] D:[F]
AI参考:正确选项为：B: [M] C: [T] 选项B和C是质量体系要素的基本单元，分别是《质量管理体系基础》中描述的七个质量体系要素（即[M]单位）和四个质量体系过程（即[T]单位）。这些要素和过程是建立和维护质量管理体系的基础。而选项A、D与质量体系要素无关，因此不是正确选项。
A:Finite difference method B:The rigid body element method C:The boundary element method D:The finite element method
AI参考:正确答案是【ABD】：有限差分法、刚体元素法和有限元法。 这三个选项都是数值模拟技术常用的数值计算方法，其中有限差分法是用于求解偏微分方程的数值方法，刚体元素法主要用于刚体动力学的研究，有限元法是解决复杂形状和结构的力学问题最常用的方法之一。因此，正确答案为ABD。C选项的边界元素法通常用于电磁场、热传导等领域的研究，但并非数值模拟技术常用的数值计算方法之一。
A:Cohesive force B:Tensile strength C:Friction Angle D:dilatancy angle
AI参考:对联结件属性所需要的参数有： * **粘聚力**（Cohesive force）。这是指联结件之间的内聚力，它能够保持联结件的稳定性。 * **抗拉强度**（Tensile strength）。这是指联结件在拉伸时的强度，用于衡量其承受拉伸载荷的能力。 * **摩擦角**（Friction Angle）。这是指联结件在滑动摩擦时所需的摩擦力，用于衡量联结件的耐磨性。 因此，选项A和B是正确的。选项D是关于膨胀角的描述，与联结件的属性无关。所以，正确选项是【A:Cohesive force B:Tensile strength】。
A:After analysis and calculation, the optimized design scheme is adopted to reduce the cost of engineering and products B:Determine the design scheme of engineering problem as soon as possible, accelerate product development C:Identify potential problems during the engineering and product design phases D:The simulated physical test programme reduced the number of tests, thereby reducing the cost of tests
AI参考:对于数值模拟研究的各项功能，正确选项为： A:After analysis and calculation, the optimized design scheme is adopted to reduce the cost of engineering and products 以及 D:The simulated physical test programme reduced the number of tests, thereby reducing the cost of tests。 这是因为数值模拟研究的主要功能包括： 1. 分析计算后，采用优化设计方案以降低工程和产品的成本（A选项正确）； 2. 尽可能快地确定工程问题的设计方案，加速产品开发（B选项正确）； 3. 在工程和产品设计阶段识别潜在问题（C选项正确）； 4. 通过模拟物理测试方案减少测试次数，从而降低测试成本（D选项正确）。 没有一项功能涉及到减少试验次数并同时降低试验成本。所以没有D选项的答案与整体一致性最高。 总的来说，对于正确答案选择是ABCD的表述并不完全准确，应该修改为"通过模拟物理测试方案减少测试次数，从而降低试验成本"。这是数值模拟研究的几种主要功能之一。因此，根据提供的信息，正确的答案是：A: After analysis and calculation, the optimized design scheme is adopted to reduce the cost of engineering and products 以及 D: The simulated physical test programme reduced the number of tests, thereby reducing the cost of tests。
A:Geometric similarity theorem B:the second similarity theorem C:Physical similarity theorem D:The First Theorem of Similarity
AI参考:正确选项是【D:The First Theorem of Similarity】。 相似论是数学中一个重要的理论，用于描述两个几何形状在某种变换下保持相似性的性质。根据题目描述，以下相似理论，因此选项A和B不符合。而选项C的物理相似定理通常用于描述物理量之间的相似关系，与题目中的几何形状相似理论不符。因此，选项D的第一个相似定理是最符合题意的。这个定理主要研究的是两个几何形状在某种变换下保持相似性的性质，这是相似论的核心思想。
A:Process trival B:Dry hard C:heavy workload D:Observation is not intuitive
