Surveying on the Destruction Laws of the Cover Rocks by Sublevel Caving Method in Yanzhou Mine Areas

Abstract：Based on the destruction height of the cover rocks by sublevel caving method in three coal mines with overhead?hole surveying technique, the authors have analyzed the morphological characteristics in the water conducted zone and its maximum height development process.The conclusion is valuable and practical for further researches of the destruction laws of the cover rocks by sublevel caving method and its safty production in coal mines.

Keyword：sublevel caving coal;destruction of the cover rocks;survey;