考慮顆粒破碎的粗粒料力學(xué)特性數(shù)值試驗(yàn)初步研究
本文關(guān)鍵詞: 粗粒料 力學(xué)特性 數(shù)值試驗(yàn) 顆粒破碎 DDA 計(jì)算參數(shù) 出處:《長(zhǎng)江科學(xué)院》2014年碩士論文 論文類(lèi)型:學(xué)位論文
【摘要】:粗粒料是由大小不等、性質(zhì)不一的巖石顆粒彼此充填而成的散粒集合體,在荷載作用下易發(fā)生顆粒破碎。顆粒破碎影響了粗粒料的力學(xué)特性。由于試驗(yàn)條件的限制,物理試驗(yàn)結(jié)果的準(zhǔn)確性和普遍性受到影響。數(shù)值試驗(yàn)則不受此限制,可作為物理試驗(yàn)的有效補(bǔ)充手段。本文采用二維非連續(xù)變形分析方法(DDA)進(jìn)行考慮顆粒破碎的粗粒料力學(xué)特性數(shù)值試驗(yàn),主要研究工作和研究成果如下: (1)建立了粗粒料力學(xué)特性DDA數(shù)值試驗(yàn)?zāi)P,研究了接觸剛度、時(shí)間步長(zhǎng)、阻尼等計(jì)算參數(shù)的合理取值。 (2)基于ANSYS軟件的有限元前處理技術(shù),對(duì)粗粒料顆粒進(jìn)行塊體細(xì)分,滿足了模擬顆粒破碎的需要。 (3)考慮到粗粒料力學(xué)特性數(shù)值試驗(yàn)計(jì)算量大,將塊雅克比預(yù)處理共軛梯度法和并行計(jì)算技術(shù)用于求解DDA方程組,提高了計(jì)算速度。 (4)考慮顆粒破碎的數(shù)值試驗(yàn)成果與三軸試驗(yàn)成果總體接近,,而不考慮顆粒破碎的應(yīng)力-應(yīng)變曲線明顯高于考慮顆粒破碎的曲線,且與三軸試驗(yàn)曲線的差異大,說(shuō)明考慮顆粒破碎是必要的。 以上研究工作為DDA在粗粒料力學(xué)特性研究中的應(yīng)用奠定了基礎(chǔ)。
[Abstract]:Coarse grain is a granular aggregate filled with rock particles of different sizes and different properties, which is liable to be broken under load. Particle breakage affects the mechanical properties of coarse grain, due to the limitation of test conditions. The accuracy and universality of physical test results are affected. Numerical tests are not subject to this limitation. In this paper, a two-dimensional discontinuous deformation analysis method is used to carry out numerical experiments on the mechanical properties of coarse grain considering particle breakage. The main research work and results are as follows:. 1) the DDA numerical test model of the mechanical properties of coarse grain is established, and the reasonable calculation parameters such as contact stiffness, time step size and damping are studied. 2) based on the finite element preprocessing technology of ANSYS software, the coarse granular particles are subdivided into blocks, which can meet the needs of simulating particle breakage. In view of the large amount of calculation in the numerical test of the mechanical properties of coarse grain, the block Jacobian preconditioning conjugate gradient method and the parallel computing technique are used to solve the DDA equations, and the calculation speed is improved. (4) the numerical test results considering particle breakage are in general close to those of triaxial test, but the stress-strain curve without considering particle breakage is obviously higher than that considering particle breakage, and there is a great difference from the triaxial test curve. It shows that it is necessary to consider particle breakage. The above work lays a foundation for the application of DDA in the study of the mechanical properties of coarse granular materials.
【學(xué)位授予單位】:長(zhǎng)江科學(xué)院
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:TV641.4;TV41
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