Application of π type steel girder in broken easy caving roof
Analysis on the roof fall before frame in light caving face
The block which will be the first of caving rocks from free surface and lead to more caving or side-fall in underground work is known as" critical rock".
We would not neglect our defenses; we would not risk falling behind.
Analysis of Roof Caving Instability Mechanism of Large-Section Roadway Under Complex Conditions
Research on Rapid Reinforcement Technology for Mine Inclined Shaft Passing Through Dynamic Roof Failing Zone
Practice of Supporting Method with Small Wooden Stand in the Residual Stones of Caving Mining Area
Research on repair technology for deep mine roadway with fault falling in Qishan Mine
The engineering cases show that grouting is an effective way to get across the collapsed zone.
Study on Mechanism of the Grouting Backfill in Caving Area with Strip Mining under Buildings;
The Investigation on Roof Falling Morphology and the Gas Migration Law in Goaf under the Condition of Drainage
Study on Relationship between Depositing Characteristic of Falling Waste and Top Coal Recovery in Full-mechanized Caving
The theoretical study on loss rate of top coal and quantitative characteristics of piled waste
Frogger Adventure The Lost Wand
The student risked his life to save the boy falling into water.
Our policy constantly ran the risk of falling between two stools.
When that branch fell on my head, I saw stars for several seconds.
A ground squirrel emerges into a field of wildflowers in the Canadian Rockies.