发电机定子冷却水管路堵塞的原因分析及处理

利用FLAC模拟了不同岩石峰后脆性条件下圆形巷道围岩的破坏区分布及能量释放规律。在计算中,采用了应变软化本构关系及"先加载,后挖洞"方式。模拟结果表明,随着峰后脆性的增加,围岩中发生破坏的单元变多,释放的弹性应变能总量增加,巷道围岩越来越难于再次达到平衡状态;尽管在一些算例中出现了沿环向发展的破坏区,但是不认为这与分区破裂化现象有关;难于采用二维的滑移线或破坏特征线解释分区破裂化现象。围岩分区破裂化现象的研究可从三维连续介质模型的空间局部化视角出发,亦可从二维颗粒体模型的颗粒相互作用机制视角出发,这两种思路都引入了二维连续介质模型中不具备的因素。

Cause analysis and treatment on blockage of water cooling pipe line in generator stator

Failure zone distribution and energy liberation in the surrounding rock of a circular tunnel at different post-peak brittleness are modeled by using of FLAC.A strain-softening constitutive relation is used and a tunnel is excavated after the model is loaded to reach a static equili-brium state.Numerical results show that for more brittle rock,the number of failed elements in the surrounding rock is greater;the released elastic strain energy is higher;and the equilibrium of the surrounding rock after the tunnel excavation is later.Although some loop failure zones are observed in some examples,these zones are not believed to be related to the zonal disintegration phenomenon.It is difficult to study the zonal disintegration phenomenon using the two-dimensional slip lines or failure characteristic lines.For investigating the zonal disintegration phenomenon,we can use the three-dimensional continuous medium model based on the spatial strain localization viewpoint,or we can use the two-dimensional model including granule,in which interactions among granule exist.These two methods introduce new factors that are absent in the two-dimensional continuous medium model.