Applicable Conditions of Room-and-Pillar Mining Goaf Treatment Methods under a Traffic Load

Abstract

The disturbance depth of traffic load has a direct impact on the stability of a room-and-pillar mining goaf. To quantitatively calculate the relationship between the traffic load disturbance depth and influencing factors, 49 groups of horizontal combinations of different influencing parameters are designed in this study, based on the orthogonal experimental design method. Midas GTS is used to simulate and obtain the corresponding traffic load disturbance depth data. A multivariate linear regression analysis of the traffic load disturbance depth is conducted, and a regression formula for calculating the traffic load disturbance depth is established. According to the traffic load disturbance depth, goaf depth, and the stability of the roof, coal pillar, and base plate under traffic load conditions, a judgment flow of the room-and-pillar mining goaf treatment method under traffic load conditions is established, and it is applied to the reconstruction and expansion project of the Jixi section of the Dan-A national highway. The results show that a geogrid can be used for treatment purposes when the traffic load disturbance depth is 1.5 times lower than the depth of the room-and-pillar mining goaf, or when the traffic load disturbance depth is 1.5 times greater than the depth of the room-and-pillar mining goaf but the roof, coal pillar, and base plate are stable. Additionally, grouting is needed for treatment in other cases. The results of this study can provide a scientific basis for the selection of treatment methods for room-and-pillar mining goafs underlying highways in the future. The results are of great significance in the field of engineering for the safety measures concerning highway room-and-pillar mining goafs.

Coal and Rock Dynamic Disasters: Advances of Physical and Numerical Simulation in Monitoring, Early Warning, and Prevention - Volume II

“…In terms of quarry area management, dealt with goaf-related hazards in advance at specific working faces by enhancing continuous monitoring of water levels and volumes. The most widely available approach for ground pressure management is to use the waste rock, tailings sand, concrete and other materials to fill the goafs (Deng et al, 2009;Feng and Huang, 2020;Yu et al, 2022;Zu et al, 2023).…”

Triaxial Test of Coarse-Grained Soils Reinforced with One Layer of Geogrid

“…The conducted studies have unveiled the intricate stresses generated by dynamic loads in road structures [46]. Hence, there is a critical need to analyze, calculate, and precisely select stress values within the structure, particularly in the context of a road embankment [47]. To address these considerations, the decision was made to employ static loads, aligning with the specifications outlined in standard documents.…”

Early warning technique research of surface subsidence for safe mining in underground goaf in Karst Plateau zone

“…In terms of quarry area management, (Wang et al, 2023) dealt with goaf-related hazards in advance at specific working faces by enhancing continuous monitoring of water levels and volumes. The most widely available approach for ground pressure management is to use the waste rock, tailings sand, concrete and other materials to fill the goafs (Deng et al, 2009;Feng and Huang, 2020;Liu et al, 2022;Yu et al, 2022;Zu et al, 2023).…”