本文選題：BPM巖土模型 + 巖土機(jī)械��； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：離散元法中的粘結(jié)顆粒模型(Bonded Particle model,簡(jiǎn)稱BPM)已被廣泛應(yīng)用于巖土機(jī)械的研究。巖土機(jī)械以巖土物料為工作對(duì)象,物料的受力、運(yùn)動(dòng)情況復(fù)雜多變,物料的BPM模型的精確程度直接影響巖土機(jī)械工況仿真的準(zhǔn)確性。本文運(yùn)用數(shù)值方法分析大量仿真結(jié)果得出了BPM細(xì)觀參數(shù)與宏觀參數(shù)的數(shù)學(xué)關(guān)系式,并據(jù)此關(guān)系式提出了一種BPM巖土模型的建立方法。采用物理巖石試驗(yàn)與仿真對(duì)比的方式驗(yàn)證了這種BPM建立方法的準(zhǔn)確性,并將這種方法應(yīng)用于雙齒輥破碎機(jī)、平地機(jī)、旋回破碎機(jī)的工況仿真中。 本文的主要內(nèi)容如下： 1.分析單軸壓縮試驗(yàn)、三軸壓縮試驗(yàn)、點(diǎn)荷載強(qiáng)度試驗(yàn)這三種典型且通用的巖石強(qiáng)度試驗(yàn),歸納出它們各自的特點(diǎn)及適用范圍；分析旋回破碎機(jī)與雙齒輥破碎機(jī)這兩種巖土機(jī)械工作狀態(tài)下,物料的受力、運(yùn)動(dòng)情況,歸納出它們的共同點(diǎn)；根據(jù)各巖石強(qiáng)度試驗(yàn)特點(diǎn)及巖土機(jī)械工作狀態(tài)下的物料受力、運(yùn)動(dòng)的共同點(diǎn),選擇單軸壓縮試驗(yàn)進(jìn)行仿真。 2.運(yùn)用數(shù)值方法對(duì)數(shù)百組BPM單軸壓縮仿真的結(jié)果進(jìn)行分析,得出BPM模型細(xì)觀參數(shù)與宏觀性能之間的數(shù)學(xué)關(guān)系式；根據(jù)此數(shù)學(xué)關(guān)系式及建模細(xì)節(jié)總結(jié)出建立精確BPM模型的方法。 3.按本文方法建立五蓮花花崗巖BPM模型；對(duì)五蓮花花崗巖進(jìn)行多組單軸壓縮試驗(yàn),并對(duì)此試驗(yàn)進(jìn)行仿真；將仿真與試驗(yàn)的結(jié)果進(jìn)行對(duì)比分析,驗(yàn)證本文方法所建立的BPM模型在巖石力學(xué)試驗(yàn)仿真中的精確性。 4.將按本文方法建立的巖土物料模型應(yīng)用到雙齒輥破碎機(jī)、平地機(jī)、旋回破碎機(jī)的工況仿真中；將本文中這三個(gè)仿真與以往同類型研究的結(jié)果進(jìn)行對(duì)比分析；總結(jié)出本文方法相對(duì)以往同類研究中所用方法的具體優(yōu)勢(shì)。
[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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD31

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本文編號(hào)：2080654