放大断面 meaning in Chinese

enlarged section

Structure optimization and application of steel trapezium - shaped support
对焊工字钢支架在综放大断面开切眼中的应用
Bolt support technique for large section with top - coal caving mining in three - soft seam roadway
综放大断面三软煤巷锚杆支护技术
Support technology for large cross section roadway driving along next goaf in fully mechanized sub - level caving face in high stress three - soft seam
高应力三软煤层综放大断面沿空掘巷支护技术
Similar materials experiment of the influence laws of load coefficient on the surrounding rock of large - section starting cut in top - coal caving face
载荷系数影响综放大断面开切眼围岩变形相似模拟研究