Study on the failure characteristics of overburden and the evolution law of seepage field in deep buried thick coal seam under aquifers

Abstract

Water inrush at roof area seriously affects the safety of coal mines. The characteristics of aquifer and aquiclude at Wutongzhuang Mine are analyzed. Considering the effect of seepage field, a formula for calculating the height of water-conducting fractured zone (HWCFZ) in deep buried thick coal seam mining is derived. A damage-seepage coupling model with rock porosity and damage factor as independent variables is established. FLAC3D is re-developed by using FISH language, and the fluid-solid coupling calculation model of deep buried thick coal seam mining is established. The evolution law of the plastic zone, seepage field and water-conducting fractured zone (WCFZ)of the overburden in the gob with the advancement of the working face is analyzed, the main conclusions are as follows: With the continuous advancement of the working face, the distribution shape of the plastic zone and seepage field has changed from a trapezoidal to a saddle shape; when the working face reaches full mining, the maximum heights of the caving zone, fractured zone and HWCFZ are 24m, 113m, and 123 m, respectively; the 50m-thick sandy shale aquifer is penetrated by the WCFZ, and the WCFZ on the side of the working face above the gob is the main water channel when the working face is advanced to 220m. The on-site monitoring results showed that the 50m-thick sandy shale is successively connected by the WCFZ. The results of comprehensive research showed that the HWCFZ cannot be calculated by traditional formulas when mining deep buried thick coal seams.

Study on Roof Instability Effect and Bearing Characteristics of Hydraulic Support in Longwall Top Coal Caving

“…Therefore, the spring damping model replaces the column, as shown in Figure 8. Based on the stiffness definition of the series spring and the fluid-solid coupling theory [47], the equivalent stiffness of the cylinder can be defined as Equation (12):…”

“…The impact of roof instability on the working face makes the stability of the coal wall worse, increasing the probability of rib spalling [10]. On the other hand, different bearing conditions of hydraulic support have a significant impact on the subsidence and collapse of roofs [11,12]. Therefore, the movement instability of the roof is closely related to the bearing characteristics of the hydraulic support.…”

The study of the development patterns of water-conducting fracture zones under karst aquifers and the mechanism of water inrush

“…In recent years, with the development of computer technology, numerical simulation has been widely used to simulate and analyze stress fields, displacement fields, and fracture field evolution characteristics of working faces [19][20][21][22] . Li et al [23] simulated the effect of the dip angle of a deeply buried ore body on the stress of a mining field, finding that when the dip angle is 30°, the roof is most susceptible to shear failure.…”