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基于StrataKing的巷道破坏和失稳非常规计算方法

Unconventional methods for failures and instabilities of roadways based on StrataKing

  • 摘要: 在向地下索取资源和能源的过程中, 为了满足运输和通风等需求, 不可避免地要形成各种狭长的通道。随着向深部进军, 通道的破坏和失稳问题引发了越来越多的关注。含孔洞的围岩模型力学行为的数值模拟研究的优势体现在省时省力, 花费少, 且能获得较多的信息, 但可靠结果在很大程度上依赖于是否采用了先进的数值计算方法。最近, 岩层运动并行计算系统StrataKing被成功研发, 其具有计算规模大(可达500万单元), 计算效率高, 矿业特色明显等优势。继对含孔洞的围岩模型进行常规加载(在模型边界上施加恒定的应力和速度)取得若干研究进展之后, 开始尝试非常规研究手段, 具体包括静动组合加载、静动模式转化和临界应力计算, 他们在有些国外商业软件中并不具备, 以满足进一步的或特殊的研究需要。研究结果表明, 在静载存在条件下, 周期冲击的幅值越高, 巷道围岩的破裂和运动程度越大, 这使巷道围岩平衡变得更加困难, 而且, 首次冲击能引发更多的破裂, 这应与首次冲击引发的破裂具有一定的吸能作用有关; 在与灾害孕育–发生过程更相符的准静力计算模式向动力计算模式转化的混合计算模式下, 巷道围岩的破裂和运动更为严重, 这说明传统的准静力计算模式适用性有限; 当冲击能指数在正常范围时, 正方形巷道围岩临界应力的计算结果比理论结果(严格上仅适用于圆形巷道)大, 而利用StrataKing可以处理任何形状巷道。StrataKing的大规模计算能力、丰富功能和鲜明矿业特色得以进一步呈现。

     

    Abstract: Various long and narrow passages are inevitably formed for transportation and ventilation in undergroudn resources and energy exploitation. At depth, failures and instabilities of passages have attracted more and more attention. Using numerical simulation of surrounding rock models containing holes can save time and effort, costing relatively little but obtaining more information. However, reliable results depend on whether advanced numerical methods are used. Recently, a parallel computing system for strata movement (StrataKing) has been developed with a large calculation scale (up to 5 million elements), high calculation efficiency and obvious mining characteristics. After researches on the surrounding rock model containing holes with conventional loading (applying constant stress and velocity on the model boundary), further research, including static and dynamic combined loading, static and dynamic mode transformation and critical stress calculations was conducted. The results show that when the static load exists, the higher the amplitude of periodic impact, the greater the degree of fracture and movement of the surrounding rock of the roadway. This leads to difficulty in balance of surrounding rock of the roadway. As a result, the first impact can cause more fractures, which should be related to the fact that fractures caused by the first impact has a certain energy absorption effect. When the quasi-static calculation model is changed toward the dynamic calculation model progressively, which is more consistent with the disaster gestation and occurrence process, the cracking and movement of the surrounding rock of the roadway are more serious, showing the limitation of traditional quasi-static calculation mode. When the impact energy index is in the actual range, the critical stress of the surrounding rock of the square-profiled roadway is larger than the theoretical result (strictly applicable to circular roadways). By comparison, any shape of the roadway can be considered in StrataKing with large-scale computing capabilities, rich features and mining characteristics.

     

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