By analysing the examples of air burst collapses, the paper presents the three stages of air burst collapse development, that is, the first stage (air pressure formation), the second stage (soil deterioration), and the third stage (air pressure release and collapse).

Vacuum heattreatment of operation appliance forging die of 3Cr2W8V steel was suitable carried out,compared to salt bath heattreatment,the die has upper hardness and excellent toughness,the wear resisatnce of die surfance was enhanced,the defect of sink and stick was overcame,the life of die was improved.

Law of Ground Collapse Law of Dahongshan Copper-iron Deposit and Its Prevention;

Analysis on the Stability of Karst Collapse Area in Xinqiao Pyrite Mine;

Femoral head osteonecrosis collapse prediction using 3-D reconstruction and volume measurement methods;

Ecological and Environmental Problems of Subsidence in Jixi Caused by Coal Mining and Treatment Measures;

Discussion of Titanium Mesh Early Subsidence in Anterior Cervical Subtotal Subcorpectomy Patients;

Reposition and reinforcement of subsidence for flat slabs of a post-prestressed concrete flat slab-column construction;

at the entrance section of Dabaoshan left tunnel line of freeway in Guangdong province of the main line of Beijing-Zhuhai national highway , the land fall induced surface cracking and collapsing have been prevented .

There are plenty of water resources in coal-mining subsided land with high groundwater level in plain area.

How to scientifically use the subsided land has become an important problem for mining area sustainable development.

There are plenty of water resources and land resources to be reclaimed in subsided land of mining coal with higher level of underground water on plains.