【摘要】：巖土體的破壞涉及復(fù)雜的斷裂、摩擦作用、彈性波和能量轉(zhuǎn)換過(guò)程。本文給出了離散元模型中各類(lèi)機(jī)械能,以及斷裂熱、阻尼熱和摩擦熱的計(jì)算理論。同時(shí),考慮外力做功,建立了離散元能量轉(zhuǎn)化和能量守恒計(jì)算法則�；诖死碚摳倪M(jìn)Mat DEM軟件,實(shí)現(xiàn)了31.2萬(wàn)單元三維滑坡的滑動(dòng)過(guò)程和能量轉(zhuǎn)化模擬。模擬中,各類(lèi)機(jī)械能相互轉(zhuǎn)化,并在阻尼、斷裂和摩擦作用下轉(zhuǎn)化為熱量,但是總能量始終保持不變,有效地實(shí)現(xiàn)了離散元能量守恒模擬。模擬中發(fā)現(xiàn)滑坡滑帶產(chǎn)生大量摩擦熱,并提高滑帶的溫度。能量轉(zhuǎn)化和熱量生成曲線反映了滑坡在滑動(dòng)各階段的運(yùn)動(dòng)特征。此模型可廣泛應(yīng)用于巖土體破壞和多場(chǎng)耦合數(shù)值模擬研究。
[Abstract]:The failure of the rock and soil body involves complex fracture, friction, elastic wave and energy conversion process. In this paper, various kinds of mechanical energy in the discrete element model, as well as the calculation theory of fracture heat, damping heat and friction heat are given. At the same time, considering the work of external force, the method of discrete element energy conversion and energy conservation is established. Based on this theory, the MtDEM software is improved, and the sliding process and energy conversion simulation of the 31.2 million unit three-dimensional landslide are realized. In the simulation, various kinds of mechanical energy are mutually converted and converted into heat under the action of damping, fracture and friction, but the total energy is always kept constant, and the energy conservation simulation of discrete elements is effectively realized. In the simulation, the sliding belt of the landslide is found to generate a large amount of friction heat and the temperature of the sliding belt is improved. Energy conversion and heat generation curves reflect the motion characteristics of the landslide during the sliding stages. The model can be widely used in the numerical simulation of rock-soil damage and multi-field coupling.
【作者單位】： 南京大學(xué)地球科學(xué)與工程學(xué)院;南京大學(xué)(蘇州)高新技術(shù)研究院;地質(zhì)災(zāi)害防治與地質(zhì)環(huán)境保護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室(成都理工大學(xué));
【基金】：國(guó)家自然科學(xué)基金(41225011,41302216) 青島海洋科學(xué)與技術(shù)國(guó)家實(shí)驗(yàn)室開(kāi)放基金(QNLM2016ORP0110) 蘇州市科技計(jì)劃項(xiàng)目(SYG201614)
【分類(lèi)號(hào)】：P642.22
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本文編號(hào)：2483056