Analysis of the Influence Mechanism of Small Fault Activation under the Influence of Mining at Deep Coal Faces

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Abstract
The influence mechanism of different geological parameters on the activation of small faults under mining in the deep coal face was investigated by numerical simulation. The study shows that (1) the degree of influence of six parameters including the fault lateral pressure coefficient lambda, elastic modulus E, Poisson's ratio mu, cohesion c, internal friction angle phi, and fault inclination angle theta on the activation of small faults was ranked in order as theta > lambda > phi > mu > E > c. (2) The lateral pressure coefficient lambda of the fault zone rock mass, the internal friction angle phi, and the fault inclination angle theta had a great influence on the fault activation. The larger the lambda of the fault zone rock mass was, the smaller the phi was, the larger the subsidence amount drop of the rock layers on both sides of the fault was, and the greater the severity of the fault activation was. The fault activation degree decreased first, then increased, and then decreased with the increase of theta. When theta was 15 and 60 degrees, there was relatively severe fault activation. When theta was 75 degrees, the fault was not easy to activate. (3) Poisson's ratio mu, elastic-modulus E, and cohesion c of the fault zone rock mass had little effect on the fault activation. The larger the E of the fault zone rock mass was, the larger the mu was, the smaller the c was, and the possibility of fault activation increased slightly. The research results can provide important theoretical support for the theoretical research on fault activation, on-site roof management, and mining schedule arrangement in the mining process of deep coal face.
Funding Information
  • Ministry of Education of the People's Republic of China (IRT_16R22)
  • National Natural Science Foundation of China (51704099, 51734007, 52074106)
  • Henan Polytechnic University (B2019-56)
  • Key Research and Development and Promotion Projects in Henan Province (212102310105)

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