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深部地下洞室开挖后,洞室表层围岩会出现大量微裂隙,在二次应力场调整过程中,这些微裂隙逐步扩展贯通导致围岩出现片帮、板裂以及塌落等损伤现象,从而无法利用钻孔取样对表层损伤区岩体的弹性模量进行确定。本文基于损伤力学原理,利用现场声波测试与经验公式对损伤岩体的弹性模量进行初步判断,确定其大致范围,然后联合神经网络与损伤本构模型RDM对岩体的弹性模量进行精确反演,进而获得损伤岩体弹性模量的分布规律。通过红透山27采场的实际应用,证明了该方法确定深部损伤岩体弹性模量以及岩体完整性分布规律的可行性。
After excavation of deep underground caverns, a large number of micro-cracks will appear in the surrounding rock of the cavern. During the process of secondary stress field adjustment, these micro-fractures will gradually expand and lead to the occurrence of damage such as spalling, cracking and slump in the surrounding rock. So drilling sample can not be used to determine the elastic modulus of rock mass in the surface damage area. Based on the principle of damage mechanics, the acoustic modal and field empirical formula are used to judge the elastic modulus of damaged rock mass and determine its approximate range. Then, the joint elastic network and damage constitutive model (RDM) are used to accurately predict the elastic modulus of rock mass. Play, and then get damaged rock mass distribution of elastic modulus. Through the practical application of Hongtoushan 27 stope, it is proved that this method is feasible to determine the elastic modulus of deep damaged rock mass and the distribution of rock mass integrity.