Mechanical Performances of Pressure Arch in Thick Bedrock during Shallow Coal Mining

摘要: Due to the periodicity of mine pressure, it can easily lead a wide-range damage overburden rock under shallow coal mining conditions, and falling is usually serious threat safety. Based on monitoring data pressure in typical northern China, mechanical model surrounding field was built identification indicators arch after defined. Then, arching mechanism, stress distribution characteristics different positions, bearing capacity were analysed, evolution horizontal verified by numerical simulation physical experiment. Results show that there core-bearing zone arch, width core determines arch. The affects formation development caving loose field. conclusions obtained study are important theoretical value direct similar engineering practice.