一維動靜組合加載下巖石力學(xué)特性的數(shù)值模擬研究
發(fā)布時間:2018-11-12 07:06
【摘要】:為了探究一維動靜組合加載下巖石的力學(xué)特性,采用數(shù)值模擬方法,對巖樣進行模擬,以巖石單軸抗壓強度的0%、20%、50%和80%作為軸壓值,分別設(shè)置動荷載值進行加載。通過對模擬的應(yīng)力-位移曲線、強度、應(yīng)變、破壞特征進行分析,得出以下結(jié)論:在不同的軸壓和動載下,峰后曲線出現(xiàn)應(yīng)變回彈,應(yīng)力跌落,峰后塑性3種變化;動態(tài)抗壓強度隨著應(yīng)變率的增大而提高,隨著軸壓的增大,動態(tài)抗壓強度呈現(xiàn)先增大后減小的趨勢;軸壓一定時,改變動載幅值,應(yīng)變曲線出現(xiàn)先增大后減小、峰后曲線不隨加載時間變化、一直增大3種變化趨勢;無軸壓下巖樣的破壞模式為拉伸破壞,有軸壓下巖樣的破壞模式為壓剪破壞。
[Abstract]:In order to investigate the mechanical properties of rock under one-dimensional dynamic and dynamic combination loading, the rock samples were simulated by numerical simulation method, and the axial compression values were taken as 50% and 80% of the uniaxial compressive strength of the rock. Dynamic load values are set to load. By analyzing the simulated stress-displacement curve, strength, strain and failure characteristics, the following conclusions are drawn: under different axial compression and dynamic load, the post-peak curve has three changes: strain springback, stress drop and post-peak plasticity; The dynamic compressive strength increases with the increase of strain rate and increases with the increase of axial compression. When the axial pressure is fixed, the dynamic load amplitude changes, the strain curve increases first and then decreases, and the post-peak curve does not change with the loading time. The failure mode of rock samples without axial compression is tensile failure, and the failure mode of rock samples with axial compression is compression and shear failure.
【作者單位】: 云南省建筑科學(xué)研究院;昆明理工大學(xué);
【基金】:國家自然科學(xué)基金項目(41362013,41672303)
【分類號】:TD315.3
本文編號:2326402
[Abstract]:In order to investigate the mechanical properties of rock under one-dimensional dynamic and dynamic combination loading, the rock samples were simulated by numerical simulation method, and the axial compression values were taken as 50% and 80% of the uniaxial compressive strength of the rock. Dynamic load values are set to load. By analyzing the simulated stress-displacement curve, strength, strain and failure characteristics, the following conclusions are drawn: under different axial compression and dynamic load, the post-peak curve has three changes: strain springback, stress drop and post-peak plasticity; The dynamic compressive strength increases with the increase of strain rate and increases with the increase of axial compression. When the axial pressure is fixed, the dynamic load amplitude changes, the strain curve increases first and then decreases, and the post-peak curve does not change with the loading time. The failure mode of rock samples without axial compression is tensile failure, and the failure mode of rock samples with axial compression is compression and shear failure.
【作者單位】: 云南省建筑科學(xué)研究院;昆明理工大學(xué);
【基金】:國家自然科學(xué)基金項目(41362013,41672303)
【分類號】:TD315.3
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