Abstract
Filling mining plays an important role in controlling surface subsidence. To study the movement of overburdened rock in filling mining under thick loose layers, a numerical simulation combing field measurement in CT30101 working face in the Mahuangliang coal mine was tested. The results show that different filling rates and filling body strength have different influences on roof and surface movement. The filling rate has a greater impact, which is the main control factor. The filling stress and roof tensile stress decrease gradually with roadway filling. The filling body stress and roof tensile stress in the first and second rounds are far greater than in the fourth round. After the completion of filling, the first and second round of filling bodies mainly bear the overburden, and the total deformation of the surrounding rock of the main transport roadway is very small, and therefore the displacement of the overburdened rock is controllable. The field monitoring results also show that the overburdened rock became stable after several fillings rounds. Combing the numerical modeling and field tests results, this study can be a guideline for similar geological conditions especially for coal mining under thick loose layers and thin bedrock.
Highlights
The strength of the loose layer is far less than that of the ordinary rock layer
The law of overburden and surface movement and deformation in loose layer mining is quite different from conventional mining
Some scholars have used fractal-related theories to study the mining with thick loose layers and thin bedrock, and they found that the evolution characteristics of overlying rock fractures have good self-similarity and fractal characteristics
Summary
The strength of the loose layer is far less than that of the ordinary rock layer. The loose layer undergoes consolidation and compression deformation and loads the bedrock surface, aggravating the destruction of rock formations and mining subsidence, resulting in damage to surface buildings (structures) [1,2,3,4]. According to the engineering geological conditions of the Shandong mining area, the law of surface movement and deformation in thick loose layers and large mining height mining is studied [10,11]. The model of deep wide strip mining under super thick loose layer is established to study the relationship between the change in loose layer thickness, surface movement law, and subsidence coefficient [16]. Others used numerical simulation to study the influence of loose layer thickness/base rock thickness, buried depth/coal thickness, and three mechanical parameters of tensile strength, cohesion, and internal friction on ground subsidence [18,19,20,21,22].
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