基于地应力水平评价的围岩潜在破坏模式研究

Study on potential failure modes of surrounding rock mass based on evaluation of geostress level

围岩破坏模式分析是地下工程围岩稳定性分析、控制和支护设计的基础。经典破坏模式分类体系缺乏对深部高应力破坏问题的考虑,而已有考虑高应力破坏问题的分类方法较多地反映了岩石力学问题,弱化了对工程地质条件的分析。为此,基于围岩工程地质条件评价和地应力水平评价,综合考虑岩体结构类型、完整程度、岩质类型、围岩级别和地应力等因素,建立围岩潜在破坏模式分类体系。该分类方法适用于浅部到深部、低应力到高应力等各种情况,将更加适用于深部高应力地下工程,且以工程地质评价为基础的特点使其更便于现场工程师的理解和应用。

Analysis of failure modes of surrounding rock mass is the basic work of the stability analysis and control of surrounding rock mass and support design in underground engineering. The high geostress failure problems encountered in deep engineering cannot be included in the tradition failure mode classification. In the classification methods put forward recently,the rock mechanics problems were considered well. But the geological conditions have been overlooked in analysis. Aiming to this problem,the evaluations of geological condition and in situ stress levels were constructed firstly. Then several important factors including rock mass structure type,integrity degree,hardness grading,rock mass quality grade,and in situ stresses,were considered. The classification system of failure modes of surrounding rock mass was presented finally. This system can be applied in all of underground projects. And it is more suitable for the deep underground engineering with high stress. The application of geological condition evaluation makes it simpler to be understood and applied by the field engineers.