生产性试验表明，该类型钻头对于钻进硬而破碎地层、软硬夹层以及卵砾石地层均具有很好的使用效果。
Production experiment indicates that this kind of drill bit has ideal effect in the middle-hard broken formation and the soft-hard interlayer as well as in the gravel formation.
本文将高匹配焊缝或热影响区(haz)淬硬层中含纵向裂纹的焊接接头简化为硬夹层含平行裂纹的力学不均匀体模型。
In the paper welded joints with a crack in transverse overmatched weld or HAZ were simplified into a model in which a transverse hard layer contains a crack parallel to the interfaces.
本文在研究发震断层上覆土层中含有软夹层的基础上，采用平面应变有限元法模拟了发震断层错动时，含有硬夹层的上覆土层的破裂过程。
In this paper, we use the plain stain finite element method, simulate the rupture process of the overlaying soil with hard interlayer and analyze its failure states.
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