The instability mechanics of surrounding rock-coal mass system in longwall face and the prevention of pressure bumps

• 来源期刊: 煤炭学报（英文版）
• 学科: 工学
• 年，卷（期）: 2003,（1）
• 页码范围: 47-50
• 页数: 4页
• 分类号: TD8
• 语种: 英文

摘要

According to the movement and change rules of mechanical structure of surrounding rock-coal mass system during coal excavation, the mechanism of sudden instability and damage was found out. The criterions that distinguishing the occurring of the pressure bump were put forward. This criteria have been applied successfully in the comprehensive prevent of pressure bumps in Tangshan colliery.