The parameter 2~(1/2) U may be taken also as a tensile strength of rock which contains small randomly distributed preexisting cracks.

同时，参量2~（1/2）U 可以取做为含有随机分布较小裂隙的岩石抗拉强度。

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Rock strength is a basic parameter for rock engineering design.

岩石强度是岩体工程设计的基本依据。

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Rock strength is a basic parameter for rock engineering design.

强度是岩体工程设计的基本依据。

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