水平应力不均衡系数对矩形巷道围岩塑性区扩展的影响
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摘要
为分析水平应力不均衡系数对矩形巷道围岩塑性区扩展的影响,采用FLAC3D软件对矩形巷道不同水平应力不均衡系数条件下的塑性区分布进行模拟研究。假设理想化的地质采矿力学环境,建立4组水平应力不均衡系数数值模型,分析水平应力不均衡系数对矩形巷道塑性区的影响。结果表明,水平应力不均衡系数为1.0、2.0时,塑性区呈圆形,水平应力不均衡系数为2.5时呈矩形,水平应力不均衡系数为1.5时,顶角和底角处几乎没有发生塑性破坏;水平应力不均衡系数为1.0、1.5、2.0和2.5时的破坏范围都是闭合曲线。随水平应力不均衡系数增大,顶板和底板的围岩塑性区扩展速度是先减小再增大,而两帮的围岩塑性区扩展范围是先保持不变,到深部时突然增大。
In order to analyze the influence of horizontal stress imbalance coefficient on the plastic zone expansion of surrounding rock of rectangular roadway,FLAC~(3D) software was used to simulate the plastic zone distribution under different horizontal stress imbalance coefficients of rectangular roadway.Assuming the ideal geological and mining mechanics environment,four groups of numerical models of horizontal stress unbalance coefficient are established to analyze the influence of horizontal stress unbalance coefficient on plastic zone of rectangular roadway.It can be seen that when the horizontal stress unbalance coefficient is 1.0 and 2.0,the plastic zone appears to be circular,when the horizontal stress unbalance coefficient is 2.5,it is rectangular,when the horizontal stress unbalance coefficient is 1.5,there is almost no plastic failure at the top and bottom corners;when the horizontal stress unbalance coefficient is 1.0,1.5,2.0 and2.5,the failure range is all the same.Closed curve.It is concluded that with the increase of the horizontal stress imbalance coefficient,the plastic zone expansion velocity of the surrounding rock of the roof and floor decreases first and then increases,while the plastic zone expansion range of the surrounding rock of the two sides remains unchanged at first and increases suddenly at the depth.
In order to analyze the influence of horizontal stress imbalance coefficient on the plastic zone expansion of surrounding rock of rectangular roadway,FLAC~(3D) software was used to simulate the plastic zone distribution under different horizontal stress imbalance coefficients of rectangular roadway.Assuming the ideal geological and mining mechanics environment,four groups of numerical models of horizontal stress unbalance coefficient are established to analyze the influence of horizontal stress unbalance coefficient on plastic zone of rectangular roadway.It can be seen that when the horizontal stress unbalance coefficient is 1.0 and 2.0,the plastic zone appears to be circular,when the horizontal stress unbalance coefficient is 2.5,it is rectangular,when the horizontal stress unbalance coefficient is 1.5,there is almost no plastic failure at the top and bottom corners;when the horizontal stress unbalance coefficient is 1.0,1.5,2.0 and2.5,the failure range is all the same.Closed curve.It is concluded that with the increase of the horizontal stress imbalance coefficient,the plastic zone expansion velocity of the surrounding rock of the roof and floor decreases first and then increases,while the plastic zone expansion range of the surrounding rock of the two sides remains unchanged at first and increases suddenly at the depth.
引文
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