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本文根据碧口水电站高倾角薄层千枚岩隧洞施工实践经验,并在对这类围岩的正交各向异性特征进行分析的基础上,提出了正交备向异性围岩稳定分析的判断摸式。 分析成果与实际观测资料接近。在后期的工程实践中,在洞轴线与岩层走向之间有不同类角的情况下,对这类强风化围岩的稳定及时进行了分析判别,给施工提供了参考数据。 据此判别式所确定的不稳定岩体,即是这类介质隧洞实际的山岩压力,此压力可以代替一般所习用的普氏理论山岩压力。 在围岩分类中,对其稳定性的说明,建议补充“在隧洞围岩的不同部位,岩体强度沿切向有随之变化的特点”。
According to the practical experience of the high dip angle phyllite tunnel construction in Bikou hydropower station and based on the analysis of the orthotropic characteristics of this type of surrounding rock, the authors put forward the judgment of the stability of the orthogonal anisotropic surrounding rock Touch style. The results of the analysis are close to the actual observed data. In the later engineering practice, under the condition that there are different kinds of angles between the axis of the hole and the direction of the rock formation, the stability of this kind of strong weathered surrounding rock is analyzed and distinguished in time, which provides reference data for the construction. According to this discriminant, the unstable rock mass is the actual rock pressure of such medium tunnel, which can replace the Platts theoretic rock pressure normally used. In the classification of surrounding rock, the stability of the description, it is proposed to add “different parts of the surrounding rock in the rock mass along the tangential has the following characteristics.”