DOI: 10.11799/ce202507002
Research on key technologies for reducing subsidence through grouting in separated strata of overburden rock under the influence of faults
WANG Bingqiang
HAO Hongru
LI Fan
HOU Chengke
CAI Peng
Abstract：Addressing the challenge of coal extraction beneath villages located on the foot wall of a fault in the Dashe Mine of Fengfeng Mining Area,and considering the geological conditions of the mining area,an optimized grouting and subsidence reduction scheme for overburden separation was designed.Measures were proposed to address abnormal conditions influenced by the fault.Based on the fault conditions revealed by on-site drilling,the drilling layout was adjusted to achieve grouting reinforcement in the separation zones of the hanging wall and foot wall of the fault,as well as in the fault fracture zone.The cumulative grouting volume in the 03 working face reached 178300 tons,with a total grout-extraction ratio of 55%.It was revealed that,coal seam mining activated the fault,leading to the formation of separation spaces in the foot wall,while the hanging wall has limited capacity to form separation spaces.It was proposed to increase the treatment holes in the hanging wall to ensure effective treatment,and increase the grouting volume in the foot wall space to effectively fill the separation zone,for grouting in separated strata of the overburden influenced by the fault.The surface subsidence predicted by probability integral method showed,the maximum surface subsidence during conventional mining was 2200 mm,which decreased to 1025 mm(by 53.4%)after implementing the proposed technology.According to the on-site surface subsidence monitoring,the subsidence reduction effect was favorable,with the maximum subsidence(768 mm)located above the middle of the working face.
Keywords：layer separation groutingfaultcoal mining under buildingsrailways and water bodiesoptimized borehole layoutsurface subsidenceprobability integral method
Publication Date：2025-07-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 8-16 )