顶板控制

• Technology of controlling roof in the combined fully - mechanized coal winning and sub - level caving
  综采综放混合开采顶板控制技术
• Mine ground pressure appearance and roof control of residual pillaring in upper layer in the mining of lower layer
  上层残留煤柱在下层开采中的矿压显现与顶板控制
• Side - expanding and support - setting construction techniques in the comprehensive mechanized preparing working face under the hard roof
  高档普采工作面坚硬顶板控制与实践