The mechanical property and drillability of rocks are the basic quality available for analyzing and evaluating the anti fracture and drilling resistance of rocks.
岩石力学性质和可钻性是分析和评价岩石抵抗破碎和钻进的基本性质，也是合理选择碎岩工具和工艺的基础。
2
The relationship is analyzed between the deformation nature of floor rocks, anti-injection and the rock nature, rock classification in the floor and the basis for floor rock control is provided.
分析了底板岩层的变化特征，底板抗压人特性与岩性、岩层类别的关系。
3
Practice shows that a new-type fertilizer which is made out of aluminiferous phosphate rocks is characteristic not only of considerable fertilizer effect but of higher anti-drought ability.