Sandstone and limestone are the main targets cut by oil and gas well drilling and for their physical mechanical property there have been systematic determination method and quantitative gradation.
砂岩和石灰岩是石油天然气钻井破岩的主要对象，它的物理力学性质已有系统的测定方法和定量分级。
2
The results indicate that with this testing method, an visual gradation design is realized and the conclusions derived may serve as a guideline for the design and the construction of asphalt mixture.
结果表明，使用这种方法不仅实现了可视化级配设计，而且所得结论可以指导沥青混合料级配设计和施工。
3
Through a great number of Pu-Nan experiment datas, the pater put forward to the mixture design method, requirement of aggregate, gradation of mixture for dense graded aggregate base.