基于微震矩張量的礦山圍巖破壞機(jī)制分析
[Abstract]:Micro-earthquake is an important signal of rock mass damage and is used to analyze the stability of surrounding rock. In order to apply the moment Zhang Liang theory to study the failure mechanism of the surrounding rock in mining, the solutions to the key problems in the application of the theory are put forward: (1) by introducing the three component decomposition model of the moment Zhang Liang, which is suitable for the stress state of the rock mass in the mine, This paper solves the uncertain problem of solving the decomposition equations of moment Zhang Liang caused by the uncertainty of mine stress state. (2) aiming at the deficiency of the criterion of moment Zhang Liang rock mass failure mode proposed by Ohstu, the paper discusses and corrects it. It is suitable for rock mass failure mode analysis in mine rock mass engineering. The failure mechanism of part of roadway surrounding rock in Dongguashan Copper Mine is studied by using the improved moment Zhang Liang analysis method. The conclusion that the surrounding rock failure of Dongguashan roadway is mainly shear failure and multi-factor comprehensive action is confirmed. When the roadway passes through different strata contact zone, the microseismic event accumulates near the contact zone, which indicates that the surrounding rock of roadway appears shear failure zone and forms caving zone, and the microseismic activity in the surrounding rock of roadway located in a single rock layer is scattered. The failure reason is mostly the stress concentration of surrounding rock, and the failure form is local rock caving.
【作者單位】: 中南大學(xué)資源與安全工程學(xué)院;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(No.51474250)~~
【分類號(hào)】:TD325
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