An optimized modeling for in-situ stresses based on Rhino accurate modeling and large-scale transverse isotropic theory

Abstract

In-situ stresses are significantly important for underground mining geotechnical design and coal seam gas management in underground coal mines. Aiming at regions with geological structures, this paper proposes an in-situ stress inversion method combining Rhino precise modeling and transverse isotropy theory, and tests it near the Guodishan fault. The results show that the application of Rhino precise modeling and transversely isotropic model in in-situ stress inversion shows advantages in improving the accuracy of in-situ stress calculation. In addition, based on the inversion analysis of in-situ stress near the Guodishan fault, we believe that the fault structure has a significant impact on the distribution of in-situ stress. Within the elevation range of − 400 m to − 800 m, the horizontal stress and vertical stress of the footwall are greater than those of the hanging wall. Moreover, the K ratio near the fault is generally less than 1, but the K ratio in the footwall is usually greater than that in the hanging wall, indicating that the tectonic stress has a stronger influence on the footwall. It is worth noting that the stress gradient near the fault is higher, which may lead to higher disaster risk.

Particle flow numerical simulation model for coal and gas outburst and its microscopic outburst mechanism description

“…1 . The model parameters are shown in Table 1 , and the boundary conditions of the model are taken from reference 22 . Among them, the x direction is the minimum horizontal principal stress direction, the y direction is the maximum horizontal principal stress direction, and the z direction is the vertical stress direction, which are 11.82 MPa, 16.71 MPa, and 13.35 MPa, respectively.…”