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在建的金沙江白鹤滩水电站地下厂房开挖规模巨大,其复杂地质条件和高应力导致围岩破坏现象突出。针对左、右厂房第一层开挖过程中曾频繁遭遇到的围岩片帮破坏问题,结合地质、施工、测试、试验及数值分析资料,全面总结和深入分析玄武岩片帮机制。首先,归纳和总结地下厂房围岩片帮破坏的基本特征与规律,包括其表现形式、形态特征、空间位置、破坏规模、滞后规律、破坏发展特征、对应岩性及支护特征等主要信息;进而重点探讨厂区地应力、岩体结构、岩性、施工因素等对围岩片帮的影响规律;最后,综合分析揭示片帮的形成与发生机制。该研究可为白鹤滩水电站地下厂房后续开挖过程中围岩片帮破坏的预防和调控提供重要支撑,也可为同类高地应力条件下大型地下洞室类似围岩破坏的防控提供参考。
The under-construction of the underground powerhouse under construction at Baihetan Hydropower Station in Jinsha River is huge. The complicated geological conditions and high stress cause the destruction of surrounding rock to stand out. Aiming at the problem of the destruction of the surrounding rock fragments frequently encountered in the excavation of the first and the right of the left and right buildings, the mechanism of the basalt fragments extraction is comprehensively summarized and deeply analyzed with the help of geological, construction, test, test and numerical analysis data. First of all, the basic characteristics and regularities of the rock mass destruction in the underground powerhouse are summarized and summarized, including the main information such as their manifestations, morphological characteristics, spatial location, scale of destruction, lag rule, damage development characteristics, corresponding lithology and support characteristics; Then, the paper mainly discusses the influence law of the stress, rock mass structure, lithology and construction factors on the rock mass in the surrounding area. Finally, the comprehensive analysis reveals the formation and mechanism of the rock mass. The study can provide important support for the prevention and control of the surrounding rock fragments during the subsequent excavation of the Baihetan Hydropower Station underground powerhouse and also provide reference for the prevention and control of the similar surrounding rock failure in the underground caverns under the same high ground stress conditions.