Background: To optimize the layout position of residual coal pillar return roadway when mining a close seam group and to clarify optimization mechanism, analysis was conducted on Tashan mine. Methods: Surface displacement monitoring using field tests, main stress magnitude, plastic zone morphology, deformation variables, connectivity between were analyzed at different locations with help FLAC3D...

Developing longwall mining under weak geological conditions imposes a substantial challenge with regard to the higher risk of falling roofs. Maintaining stability face in this aforementioned condition is crucial for smooth operation. Investigating roof requires detailed study rock behavior response few key influences. This paper presents outcome numerical analysis shallow depth conditions. A se...

In order to study the local deformation of an anchor bolt and improvement in shear strength a structural surface under misalignment anchorage structure surface, FLAC3D software was used simulate granite, sandstone, coal specimens with angles 90° analyze damage anchoring agent changes axial forces bolts surface. The results show that near had significant characteristics surface; is, length area ...

Cables are commonly used for roadway support in coal mines. Traditionally, schemes show characteristics of excessive strength and resource waste; therefore, determining how to scientifically economically arrange the distribution cables is important engineering practice. To obtain best cables, this paper, particle swarm optimization (PSO) algorithm FLAC3D numerical simulation were combined condu...

Southern Shaanxi region is mountainous and landslide disasters are frequent. Micropile reinforcement technology widely used in management, especially emergency rescue projects, due to easy construction, small soil disturbance, strong site adaptability. Soil arch effect an important prerequisite for safe economic performance of the support function micropile. For swelling accumulation layer sout...

The discharge of groundwater and the load on lining structure are both significantly impacted by obstruction tunnel drainage system. In this study, fluid–structure interaction model was established based finite difference software FLAC3D. Then, research explored effects symmetric asymmetric blockage in circular drainpipe, transverse drainpipe at pipe joint pore water pressure, displacement stre...