||Very soft strata have low compressive strength and high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc.
|| Soft strata have low compressive strengthand high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc.
||Soft to medium-soft has low compressive strength, such as medium-soft shale, medium-soft limestone, medium-soft sandstone, forming medium-hard and hard grinding interlayer.
||High compressive medium-hard formation strength, such as hard shale, limestone, sandstone, dolomite, etc.
||Hard strata have high compressive strength, such as sandstone, limestone, dolomite, gypsum, marble, etc.
||Hard strata have high compressive strength, such as hard limestone, dolomite, etc.
||Extremely hard strata with high compressive strength and abrasiveness, such as hard limestone, dolomite, hard sandstone, chert, etc.
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