The Blocking Mechanism of the Vertical Feeding System of Roadside Support Body Material for Backfilling Gob‐Side Entry Retaining

Abstract

Reliable operation of the feeding system plays a crucial role in ensuring the safe and efficient production of the working face of backfilling gob-side entry retaining (GER). In the process of vertical feeding of the roadside support body material, the problem of blocking of the feeding shaft has occurred to the test mine, which seriously affects the production safety in mines. In this paper, based on the theoretical analysis, a fluid-solid coupling numerical model was established. The change rules of the speed of sacked gangue, pressure of air below it, and speed vector distribution with different vent diameters were obtained. The blocking mechanism of the feeding system was revealed. The results show that if the exhaust vent of the stock bin was shut, the speed of gangue in the mine increased and then decreased and finally blocked in the feeding shaft. If the exhaust vent of the stock bin was opened for pressure discharge, with the increase of diameter of the exhaust vent, the maximum speed and ending speed of sacked gangue increased, pressure differential reduced, and speed vector was uniformly distributed. The energy criterion of blocking of the feeding shaft was further obtained. Based on the engineering conditions of the test mine, when the feeding shaft is blocked, the critical value of diameter of the exhaust vent is 30 mm. The research results provide basis for the design of key parameters of the vertical feeding system, ensuring the safe and efficient production of gob-backfilled GER working face.

Asymmetric support technology for gob side entry retaining with high water material

“…The gob side entry retaining can realize the Y-type ventilation, effectively solve the problem of gas overrun in the upper corner, and realize gas pre-extraction of adjacent coal seams, which provides a guarantee for safe mining (Zhang and Li, 2019). The roadway along the gob is located in the low-pressure area, the probability of rockburst is greatly reduced; the coal pillar between the adjacent working faces is canceled, the amount of labor is reduced, the coal recovery rate is improved, and it has remarkable economic and social benefits (Chen at al., 2019;Gong et al, 2019;Guo et al, 2019;Han et al, 2018;Han et al, 2019).…”

Study on Surrounding Rock Stability Mechanism of Gob‐Side Entry Retaining with Prefabricated Fracture

“…e main research contents involved in gob-side entry retaining include the law of surrounding rock activity, the interaction relationship between surrounding rock and support, the support in roadway, reinforcement support, and roadside support [12][13][14][15][16]. Around these contents, some experts and scholars studied the strata behavior law of gobside entry retaining in fully mechanized top coal caving [17,18], analyzed the main parameters and adaptability of gob-side entry retaining [19][20][21], and according to the laboratory test results, analyzed two kinds of roof breaking modes of gob-side entry retaining in fully mechanized top coal caving and their influence on surrounding rock deformation [22,23].…”