Affected by coal mining activities, the remaining pillars are very likely to be destabilized and cause safety accidents. The backfilling of goaf can maintain stability pillar well, but in unfilled zone may still unstable. In this paper, effect materials on reinforcement method discussed using numerical simulation, statistical mathematics, elastic mechanics, mechanical test methods. results show...

This paper aims at reducing greenhouse gas emissions, which contributes to carbon neutrality, and, the same time, preventing mine heat disasters and extracting highly mineralized (HM) water, so as realize synergy between CO2 storage (CS) geothermal extraction utilization (GEU) in a high temperature (HT) goaf. With this purpose, an innovative CS-GEU technology for HT HM water deep is proposed, b...

It has been proven that it is a feasible treatment method to prepare paste filling material from coal-based solid waste fill underground goaf. Based on the complexity of goaf environment, especially influence humidity materials, this paper prepared materials with mass concentration 80% by using coal gangue and fly ash, carried out uniaxial compression test under four different water-bearing sta...

Mining fracture is the key factor in realizing water-conservation mining, stability evaluation of coal mining subsidence areas, and accurate restoration surface eco-environment. To clarify, evolution distribution fractures, based on strata theory degree overburden failure, contact state rock stratum after critical failure was analyzed, formation mechanism “saddle shaped” water conducting zone r...

To reveal the critical factors of main roof influencing stability surrounding rocks roadways driven along goaf in fully-mechanized top-coal caving faces, this paper builds a structural mechanics model for based on geological conditions 8105 face Yanjiahe Coal Mine, and stress equilibrium key rock block B are analyzed, focus is analyzing rules goaf. Then, orthogonal experiment range method used ...

Grouting treatment is the main technology to reduce or eliminate residual deformation and activation of foundations in goaf sites. Under influences overburden mining, distribution grouting foundation quite different from that conventional mechanism porous media. In this paper, considering time-dependent viscosity diffusion path slurry, permeation Bingham fluid derived based on seepage motion eq...

Given the growing popularity of fully mechanized longwall mining, hydraulic shields have emerged as most crucial pieces equipment whose rated support capacities are a significant assurance for safe extraction coal seams. Based on in 1,692 panel No.9 seam Qianjiaying mine, detailed study reasonable shield capacity under an extremely close goaf was conducted using field measurements, theoretical ...

Unlike land mining, the safety of seabed mining is seriously threatened by an overlying water body. In order to ensure subsea projects, it great importance understand failure characteristics and influencing factors strata deformation. Focusing on Sanshandao Gold Mine, a typical submarine deposit in China, geomechanical model testing numerical simulations were carried out. The results show that ...