board spread meaning in Chinese

网板扩张度

Key issues including water plugging types , waterproof board spreading methods , drop of external water pressure and lining design for resisting hydraulic pressure , etc . were studied , thus the composite waterproof and drainage system to control drainage were put forward , including grouting sphere for water plugging , primary support , grid sysytem for waterproof and drainage and lining to resist hydraulic pressure
重点就堵水方式、防水板铺挂形式、外水压力的折减以及抗水压衬砌设计等技术问题进行了研究，提出了可通过注浆堵水圈、初期支护、防排水网格和抗水压衬砌形成综合防排水体系，它可以达到控制排放的目的。