Numerical simulation on the deformation and failure of the goaf surrounding rock in Heiwang mine

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Shang, Yandong^1,2 ; Guo, Yanpei^1,2 ; Zhang, Wenquan^2

Taian Compus, Shangdong University of Science and Technology, Taian

271019, China^1

State Key Laboratory of Mining Disaster Prevention and Control, Qingdao

266590, China^2

关键词: Concentration coefficients;    Deformation and failures;    Failure characteristics;    Lateral boundary;    Overlying strata;    Software FLAC 3D;    Surrounding rock;    Tensile failures;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/5/052034/pdf
DOI  :  10.1088/1755-1315/121/5/052034

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The stability of overlying rock mass of mined-out area was simulated using finite difference software FLAC3D according to the gob distribution of Heiwang iron mine. The deformation, failure characteristics of surrounding rock was obtained. The subsidence of strata above the middle mined-out area was the biggest. The maximum subsidence of ground surface was 12.4mm. The farther away from the central goaf was, the smaller the vertical subsidence value was. There was almost no subsidence on the two lateral surrounding rock near mined-out area. There exists the potential danger when cutting along the boundary of goaf. The tensile stress appeared at the top and bottom of the mined-out area. The maximum of tensile stress was 34.7kPa. There was the compressive stress concentration phenomenon in the lateral boundary of mined-out area. The stress concentration coefficient was about 1.5 on both sides of gob. The upper section of the middle goaf was subjected to the tensile failure, and the upper rock mass of both sides was mainly subjected to the tensile-shear failure. The ore pillars on the inner side of the goaf were mainly subjected to the shear failure. When the overlying strata were complete, the possibility of sudden instability of the ore pillar and the sudden subsidence of the ground surface could not occur. The achievements can provide theoretical basis for the processing of the goaf.