Abstract:

In view of actual situation of serious resources waste and less than 50% of face recovery ratio to shallow seams with existing features of harder roof at the process of room and pillar mining, reasonable support strength has been studied in both cases of normal mining and force caving for improved longwall mechanized mining face, and obtained reasonable working support resistance at the condition of force caving which was better than normal mining. Based on this condition, Shandong Xin-Mei Machinery Co., Ltd. has developed hydraulic support with hanging chain and splicing beam which was suitable to existing features of shallow seams. By the field industrial test verification, the developed new support fully adapted strata behavior at the process of force caving with existing features of shallow depth and harder roof. The research has provided a useful reference for other coal mines with similar geological features.

Key words: Shallow seam, Support strength, Hydraulic support with hanging chain and splicing beam, Force caving.