岩土BPM建模方法及其岩土机械应用仿真研究

发布时间：2018-06-29 03:30

本文选题：BPM岩土模型 + 岩土机械　；参考：《吉林大学》2015年硕士论文

【摘要】：离散元法中的粘结颗粒模型(Bonded Particle model,简称BPM)已被广泛应用于岩土机械的研究。岩土机械以岩土物料为工作对象,物料的受力、运动情况复杂多变,物料的BPM模型的精确程度直接影响岩土机械工况仿真的准确性。本文运用数值方法分析大量仿真结果得出了BPM细观参数与宏观参数的数学关系式,并据此关系式提出了一种BPM岩土模型的建立方法。采用物理岩石试验与仿真对比的方式验证了这种BPM建立方法的准确性,并将这种方法应用于双齿辊破碎机、平地机、旋回破碎机的工况仿真中。本文的主要内容如下： 1.分析单轴压缩试验、三轴压缩试验、点荷载强度试验这三种典型且通用的岩石强度试验,归纳出它们各自的特点及适用范围；分析旋回破碎机与双齿辊破碎机这两种岩土机械工作状态下,物料的受力、运动情况,归纳出它们的共同点；根据各岩石强度试验特点及岩土机械工作状态下的物料受力、运动的共同点,选择单轴压缩试验进行仿真。 2.运用数值方法对数百组BPM单轴压缩仿真的结果进行分析,得出BPM模型细观参数与宏观性能之间的数学关系式；根据此数学关系式及建模细节总结出建立精确BPM模型的方法。 3.按本文方法建立五莲花花岗岩BPM模型；对五莲花花岗岩进行多组单轴压缩试验,并对此试验进行仿真；将仿真与试验的结果进行对比分析,验证本文方法所建立的BPM模型在岩石力学试验仿真中的精确性。 4.将按本文方法建立的岩土物料模型应用到双齿辊破碎机、平地机、旋回破碎机的工况仿真中；将本文中这三个仿真与以往同类型研究的结果进行对比分析；总结出本文方法相对以往同类研究中所用方法的具体优势。
[Abstract]:The bonded particle model (BPM) in discrete element method has been widely used in geotechnical research. Geotechnical machinery takes geotechnical materials as its working object. The force and movement of the materials are complex and changeable. The accuracy of BPM model directly affects the accuracy of the simulation of geotechnical machinery working conditions. In this paper, the mathematical relations between BPM mesoscopic parameters and macroscopic parameters are obtained by analyzing a large number of simulation results by numerical method, and a method of establishing BPM geotechnical model is proposed. The accuracy of the BPM method is verified by physical rock test and simulation, and the method is applied to the simulation of double-toothed roller crusher, leveler and rotary crusher. The main contents of this paper are as follows: 1. Three typical and common rock strength tests, uniaxial compression test, triaxial compression test and point load strength test, are analyzed, and their respective characteristics and applicable range are summarized. This paper analyzes the force and movement of the materials in the working state of the rotary crusher and the double-toothed roller crusher, and sums up their common points, according to the characteristics of each rock strength test and the force of the material under the working state of the geotechnical machinery, Common points of motion, select uniaxial compression test for simulation. 2. The results of hundreds of BPM uniaxial compression simulations are analyzed by numerical method, and the mathematical relationship between the mesoscopic parameters of BPM model and macroscopic performance is obtained. According to the mathematical relation and modeling details, the method of establishing accurate BPM model is summarized. 3. 3. The BPM model of Wulanhua granite is established according to the method in this paper, and the multigroup uniaxial compression test of Wulanhua granite is carried out, and the experiment is simulated, and the results of simulation and test are compared and analyzed. The accuracy of the BPM model established by this method in the simulation of rock mechanics test is verified. 4. 4. The geotechnical material model established in this paper is applied to the simulation of double-tooth roller crusher, leveling machine and rotary crusher, and the results of the three simulations in this paper are compared with the results of the same type of research in the past. The specific advantages of this method compared with those used in the previous similar research are summarized.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD31

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