cement purdah

But it is easy to cause accidents for coal pillars destroy in the big fault. This paper introduced the technique of using cement purdah to prevent water burst firstly in the big colliery based on practice.
本文在理论研究和生产实践的基础上,系统总结了肥城国家庄煤矿采用帷幕截流技术治理大水矿井突水的技术和工程经验。