A simple formula for calculating pure shear strength of concrete is derived on the basis of the verified mathematical model of concrete failure surface, the elliptic paraboloid.

本文根据已论证过的混凝土破坏面，即椭圆抛物面的数学模型，报导出一个用以计算混凝土纯剪强度的简单公式。

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The position of the geotechnical failure surface is relative to the failure criteria, and different positions and relevant shear strengths can be got by using different failure criteria.

岩土空间破坏面位置的确定与计算所选用的破坏准则有关，运用不同的破坏准则得到的土体的破坏面位置及相应抗剪强度也不同。

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Failure mode is bending failure along the surface occurred by bond-type damage, take the place of shear failure.

并且后期破坏不以剪切破坏为主，而是沿着粘结破坏面形成的薄弱面发生拉压式破坏。

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