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本文用试验和电算的方法,找出了单向水平地应力在岩芯中波及的范围和分布规律,得出了应力释放后岩芯中残留应力范围的空间壳体曲面,作出了岩芯中贮存残留应力的体积为“台体”的假设,推导出了岩芯饼化的临界地应力公式和地应力与岩饼厚度的关系式。应用这两个公式,可以求得任何岩石饼化的单向水平临界地应力和任何岩芯饼化地区地应力的大小。本文用推导的公式,计算出了二滩电站坝区正长岩的临界地应力和岩芯饼化地层的地应力。
In this paper, the range and distribution law of the unidirectional horizontal in-situ stress in the core are found by experiments and calculations, and the spatial shell surface of the residual stress range in the core after stress release is obtained, and the core is made. The hypothesis that the volume of residual stress in storage is the “tablet”, and the formula of the critical ground stress for core cake and the formula of the relationship between the ground stress and the thickness of rock cake are deduced. Applying these two formulae, one can obtain the unidirectional horizontal critical stress of any rock cake and the size of the geostress of any core cake area. In this paper, using the derived formula, the critical geostress of syenite in the dam area of Ertan Hydropower Station and the geostress of the core cake formation are calculated.