Research on the Evolution Characteristics of Floor Stress and Reasonable Layout of Roadways in Deep Coal Mining

Abstract

The safe and efficient mining of deep coal resources is severely restricted by the dynamic disasters caused by high gas and high ground stress. Taking a deep mine in China as the research background, a mechanical model of the front supporting stress with the working face was constructed through theoretical calculations. Based on the limit equilibrium theory, the stress distribution in the plastic zone and the elastic zone of the lateral working face was derived; based on semi-infinite plane mechanics model, the floor vertical and horizontal stress distribution was deduced. Then, the roadway surrounding rock stress and displacement field distribution evolution characteristics were revealed through numerical simulation. On this basis, the reasonable floor gas drainage roadway (FGDR) layout was determined: internal staggered layout was used with FGDR, the vertical distance to the working face is 20 m, and the horizontal distance to the working face end is 15 m; the open-off cut of FGDR was arranged in an external staggered layout, the vertical distance to the working face is 20 m, and the horizontal distance to the open-off cut of the working face is 15 m. It is an important practical significance for the layout of FGDR, the control of surrounding rocks, and the improvement of gas drainage effects under similar conditions through the research results.

Failure Analysis of Deep Composite Roof Roadway and Support Optimization of Anchor Cable Parameters

“…(1)-( 5), the axial stress of the anchor cable and the shear stress of the interface between the anchor cable and the surrounding rock mass can be obtained, as shown in Eqs. ( 6) and (7).…”

“…The high deviated stress field around the roadway during mining can be artificially intervened by adjusting the mining layout [6][7][8][9]. However, the high-stress field of the first mining face in the tunneling stage cannot be changed, even if the strong support on the regional stress field of the roadway is very little change [10].…”

Characteristics of Perimeter Rock Damage in a Bottom-Pumping Roadway under the Influence of Mining Activities and Rational Location Studies: A Case Study

“…They also obtained the distribution law of the supporting pressure of the rock layer of the bottom plate and the damage range of the rock layer in the bottom plate under the influence of mining. Wang et al [16][17][18][19] created a tangential stress equation for the surrounding rock in a two-way unequal pressure stress field of a circular roadway, which was derived using the method of angle-preserving transformation in the complex function, and the formula for calculating the plastic zone of the circular roadway under the condition of two-way unequal pressure was further obtained based on the Moore-Coulomb strength criterion. Zhu Ye et al [20][21][22] investigated the stability of the base plate under different stress field environments through theoretical analysis and numerical calculation and pointed out that the stresses in the base plate peripheral rock under the influence of mining were significantly different from each other, and the variability of the stress environments was the main reason for the variability in the stresses in the base plate's peripheral rock.…”

Research on Mechanisms and Control Measures of Surrounding Rock Disaster in Large Section Roadway with Top Coal under the Influence of Tectonic Stress

“…ick coal seam is a typical occurrence feature of coal resources in Western China. Large mining height comprehensive mechanized mining leads to roof suspension and collapse of the working face, which makes the problems of strong ground pressure appearance and surrounding rock control very prominent, and seriously affects the safety production of the mine [3,4]. At the same time, with the large-scale equipment of comprehensive mechanized mining face and the significant improvement of mining intensity and output, the roadway section is required to be larger and larger to ensure normal transportation and ventilation for pedestrians.…”