Abstract
In order to understand the instability characteristics of surrounding rock in the process of deep roadway excavation, a three-dimensional numerical model was established by FLAC3D to systematically analyze the influence of roadway surrounding rock stability under different in situ stress distribution forms, and the environmental coefficient of mining-induced stress η was defined, the larger the environmental coefficient of mining-induced stress is, the larger the surrounding rock stress environment is, and the range where the η coefficient is greater than 0.2 is called with the destruction-danger zone. When the initial vertical stress is maximum principal stress and minimum principal stress, by comparing the roadway along the middle ground stress direction and minimum or maximum in-situ stress direction, the variation characteristics of displacement, failure zone and failure hazard zone of roadway surrounding rock are obtained, which provides theoretical basis for the treatment of disaster accidents such as roadway surrounding rock instability and rock burst caused by deep high in-situ stress.
Highlights
Advances in Civil Engineering surface deformation shows the characteristics of “two-side displacement amount greater than roof subsidence amount greater than floor heave amount.”With the deepening of coal mining depth in recent years, the original rock stress of underground rock mass is increasing, and the anisotropy is significant [21, 22]
Redistribution of in situ stress caused by roadway excavation is closely related to the original rock stress distribution state
In order to accurately grasp the influence of in situ stress distribution on the stability of roadway surrounding rock [26,27,28], based on the discussion of the distribution form of in situ stress, this paper systematically analyzes the displacement curve of surrounding rock, the range of plastic zone, and the volume of destruction-danger zone to judge the influence on the stability of surrounding rock [29, 30]
Summary
With the deepening of coal mining depth in recent years, the original rock stress of underground rock mass is increasing, and the anisotropy is significant [21, 22]. E direct bottom is mudstone, dark gray, argilaceous structure, local silty content is high, relatively dense, flat fracture, a large number of plant rhizome fossils, thickness of 1.02∼3.95 m, and average of 2.39 m. E old bottom is fine silty sandstone, gray, silty structure, the local with high fine sand content, banded, flat and dense fracture, a large number of plant rhizome fossils in the lower part, longitudinal fractures, parallel bedding, thickness of 2.90∼5.61 m, and average of 4.47 m. Roadway surrounding rock stability of the numerical model is set up by using FLAC3D, as shown in Figure 2; the model size is 80 m ∗ 60 m ∗ 80 m, and the actual depth of the coal seam is 720-800 m. Roadway surrounding rock stability of the numerical model is set up by using FLAC3D, as shown in Figure 2; the model size is 80 m ∗ 60 m ∗ 80 m, and the actual depth of the coal seam is 720-800 m. e numerical model includes 9 layers from top to bottom. e sandstone is 11 meters, mudstone is 9 meters, Rock stratum Sandstone
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
