基于塑性扩张的岩石变参数蠕变损伤模型与工程应用
发布时间：2018-11-11 11:00
【摘要】：为研究岩石蠕变损伤过程与围岩塑性区扩展之间的内在联系,建立基于塑性扩张的变参数蠕变损伤模型(BNMC模型),该模型认为岩石塑性屈服面随蠕变时间动态变化,在σ-τ空间内,强度包络线随蠕变时间的增加而逐渐内移。采用线性插值法对该模型各蠕变参数进行处理,获得任意连续偏应力水平对应的蠕变模型参数,从而实现BNMC模型的数值化。采用该模型对金川二矿区-1 098 m水平中段下盘运输巷的蠕变变形进行数值模拟,对比研究未支护裸巷和喷锚支护巷道的蠕变变形规律。研究发现,未支护裸巷围岩塑性区边界不是一成不变的,而是随时间的发展,塑性区边界逐渐向外扩张,围岩承载力逐渐下降,从而导致围岩加速蠕变显现,巷道蠕变失稳;通过对喷锚支护巷道的蠕变数值模拟结果和多点位移计实测结果的对比,发现数值模拟曲线与实测曲线在走势上基本吻合,但在量值上实测蠕变位移值要略大于数值模拟结果;由于支护与围岩的相互作用,支护在一定程度上改变了围岩的偏应力状态和位移,阻止了围岩塑性区边界扩张,喷锚支护巷道在0~200 d的蠕变计算时段内,未呈现出加速蠕变性态。
[Abstract]:In order to study the inherent relationship between the creep damage process of rock and the extension of plastic zone of surrounding rock, a variable parameter creep damage model (BNMC model) based on plastic expansion is established. The model considers that the plastic yield surface of rock changes dynamically with creep time. In 蟽-蟿 space, the strength envelope gradually moves in with the increase of creep time. The creep parameters of the model are processed by linear interpolation method, and the creep model parameters corresponding to any continuous deflection stress level are obtained, thus the numerical value of the BNMC model is realized. The model is used to simulate the creep deformation of the bottom roadway in the middle section of -1098m horizontal level in Jinchuan No.2 Mining area, and the creep deformation of the roadway with unsupported bare roadway and shotcrete anchor support is comparatively studied. It is found that the plastic zone boundary of unsupported bare roadway is not invariable, but with the development of time, the plastic zone boundary gradually expands outward, and the bearing capacity of surrounding rock decreases gradually, which leads to the accelerated creep of surrounding rock and the creep instability of roadway. By comparing the creep numerical simulation results of shotcrete bolting roadway with the measured results of multi-point displacement meter, it is found that the numerical simulation curve is basically consistent with the measured curve, but the measured creep displacement value is a little larger than the numerical simulation result. Because of the interaction between support and surrounding rock, the support changes the state of deviant stress and displacement of surrounding rock to a certain extent, and prevents the boundary expansion of surrounding rock plastic zone. The creep calculation period of shotcrete-anchor supporting roadway is within 200 days. No accelerated creep behavior was observed.
【作者单位】： 湖南科技大学煤矿安全开采技术湖南省重点实验室;湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室;
【基金】：国家自然科学基金资助项目(51434006,51274097,51374104)
【分类号】：TD313
本文编号：2324630
[Abstract]:In order to study the inherent relationship between the creep damage process of rock and the extension of plastic zone of surrounding rock, a variable parameter creep damage model (BNMC model) based on plastic expansion is established. The model considers that the plastic yield surface of rock changes dynamically with creep time. In 蟽-蟿 space, the strength envelope gradually moves in with the increase of creep time. The creep parameters of the model are processed by linear interpolation method, and the creep model parameters corresponding to any continuous deflection stress level are obtained, thus the numerical value of the BNMC model is realized. The model is used to simulate the creep deformation of the bottom roadway in the middle section of -1098m horizontal level in Jinchuan No.2 Mining area, and the creep deformation of the roadway with unsupported bare roadway and shotcrete anchor support is comparatively studied. It is found that the plastic zone boundary of unsupported bare roadway is not invariable, but with the development of time, the plastic zone boundary gradually expands outward, and the bearing capacity of surrounding rock decreases gradually, which leads to the accelerated creep of surrounding rock and the creep instability of roadway. By comparing the creep numerical simulation results of shotcrete bolting roadway with the measured results of multi-point displacement meter, it is found that the numerical simulation curve is basically consistent with the measured curve, but the measured creep displacement value is a little larger than the numerical simulation result. Because of the interaction between support and surrounding rock, the support changes the state of deviant stress and displacement of surrounding rock to a certain extent, and prevents the boundary expansion of surrounding rock plastic zone. The creep calculation period of shotcrete-anchor supporting roadway is within 200 days. No accelerated creep behavior was observed.
【作者单位】： 湖南科技大学煤矿安全开采技术湖南省重点实验室;湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室;
【基金】：国家自然科学基金资助项目(51434006,51274097,51374104)
【分类号】：TD313
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