高抗压强度的中硬地层，如硬页岩。石灰岩。砂岩。白云岩。和硬石膏。大理石。
Medium hard formation with high compressive strength. Such as hard shale, limestone, sandstone, dolomite, anhydrite and marble.
研究表明，水对岩石力学特性的影响主要与岩石的硬石膏含量和岩芯采取率有关。
The results show that the effect of water to rock mechanics characteristic has something to do with anhydrite's content and core extraction rate.
硫酸盐岩在中国分布很广泛，特别是石膏及硬石膏，其分布遍及各省、直辖市、自治区。
Sulphate rocks are quite widely distributed in China; gypsum and anhydrite, in particular, have been found almost in all parts of China.
硫酸盐岩在中国分布很广泛，特别是石膏及硬石膏，其分布遍及各省、直辖市、自治区。
Sulphate rocks are quite widely distributed in China; gypsum and anhydrite, in particular, have been found almost in all parts of China.
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