周期性荷載作用下巖石力學(xué)特性數(shù)值模擬研究
發(fā)布時(shí)間:2019-01-08 07:58
【摘要】:為研究周期性荷載作用下巖石的力學(xué)特性,開(kāi)展了基于離散單元法(DEM)的巖石疲勞數(shù)值模擬試驗(yàn),通過(guò)模擬單軸壓縮試驗(yàn)研究了數(shù)值模型中微觀參數(shù)對(duì)試樣宏觀參數(shù)的影響,再通過(guò)數(shù)值疲勞試驗(yàn)研究了砂巖的疲勞變形特性。結(jié)果表明,砂巖的疲勞應(yīng)力—應(yīng)變曲線受控于單軸應(yīng)力—應(yīng)變過(guò)程曲線,疲勞破壞時(shí)的軸向應(yīng)變即為周期性荷載最大應(yīng)力在單軸應(yīng)力—應(yīng)變曲線中所對(duì)應(yīng)的峰后部分應(yīng)變。通過(guò)分析砂巖的疲勞漸進(jìn)破壞過(guò)程發(fā)現(xiàn),最大應(yīng)力和平均應(yīng)力是影響砂巖疲勞壽命的兩個(gè)重要因素。研究成果對(duì)于了解巖體疲勞破壞機(jī)理、合理評(píng)價(jià)工程穩(wěn)定性有重要意義。
[Abstract]:In order to study the mechanical properties of rock under cyclic loading, a numerical simulation test of rock fatigue based on discrete element method (DEM) was carried out. The influence of microscopic parameters on the macroscopic parameters of the specimen was studied by simulating uniaxial compression test. The fatigue deformation characteristics of sandstone are studied by numerical fatigue test. The results show that the fatigue stress-strain curve of sandstone is controlled by the uniaxial stress-strain process curve, and the axial strain during fatigue failure is the partial strain corresponding to the maximum stress of cyclic load in the uniaxial stress-strain curve. By analyzing the progressive fatigue failure of sandstone, it is found that the maximum stress and the average stress are two important factors affecting the fatigue life of sandstone. The research results are of great significance for understanding the fatigue failure mechanism of rock mass and evaluating engineering stability reasonably.
【作者單位】: 四川大學(xué)水利水電學(xué)院水力學(xué)與山區(qū)河流開(kāi)發(fā)保護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(51379139)
【分類(lèi)號(hào)】:TV223
本文編號(hào):2404323
[Abstract]:In order to study the mechanical properties of rock under cyclic loading, a numerical simulation test of rock fatigue based on discrete element method (DEM) was carried out. The influence of microscopic parameters on the macroscopic parameters of the specimen was studied by simulating uniaxial compression test. The fatigue deformation characteristics of sandstone are studied by numerical fatigue test. The results show that the fatigue stress-strain curve of sandstone is controlled by the uniaxial stress-strain process curve, and the axial strain during fatigue failure is the partial strain corresponding to the maximum stress of cyclic load in the uniaxial stress-strain curve. By analyzing the progressive fatigue failure of sandstone, it is found that the maximum stress and the average stress are two important factors affecting the fatigue life of sandstone. The research results are of great significance for understanding the fatigue failure mechanism of rock mass and evaluating engineering stability reasonably.
【作者單位】: 四川大學(xué)水利水電學(xué)院水力學(xué)與山區(qū)河流開(kāi)發(fā)保護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(51379139)
【分類(lèi)號(hào)】:TV223
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