Cong Li

TL;DR: In this paper, a preliminary case investigation of the coal at various mining rates in both the laboratory scale and field scale was performed, where the uniaxial compressive strength and releasable elastic strain energy (Ue) increase with increasing loading rate when the loading rate is below a threshold.

TL;DR: In this paper, a new experimental methodology called the in situ stress restoration test is proposed to recover the in- situ geostress conditions of a core as closely as possible, which can make a core less brittle and enhance its inelastic deformation, including strain hardening and strain softening.

TL;DR: In this article, the authors used fractal geometry and an algorithm that predicts the connectivity rate of the mining-induced crack network in coal-rock masses with mining face advance to determine the changes in the fractal dimension and connectivity of the mine-induced cracks.

TL;DR: In this article, a coring and testing system retaining in-situ geological conditions is presented, which consists of the pressure controller, active insulated core reactor and insulation layer and sealing film, and the ultimate bearing strength of 100 MPa for pressure preservation, temperature control accuracy of 0.97% for temperature-retained are realized.

TL;DR: In this article, three models of hard roof fracturing were proposed based on the cantilever-voussoir beam compound structure and the equations of the working resistance for long/high periodic weighting were derived.