Study on Compaction Deformation Characteristics of Collapsed Rock Mass of Goaf Under Different Water Content Conditions
CAI Yi
YAN Jia-ping
XU Liang-ji
YU Huai-jun
DONG Xiang-lin
Abstract：In order to study the influence of water filling goaf on the surface deformation,and provide scientific basis for stability evaluation of goaf,collapsed rock were taken from No.5 Seam goaf in Yangzhuang Coal Mine,compaction tests were completed with natural and satu-rated loose rock mass under different loading grades.These tests were finished to learn compaction deformation of loose rock mass under dif-ferent conditions.Under every loading grade,axial stress measured by pressure sensor changed with increasing time,and axial compression deformation of loose rock mass could be also measured.Under every loading grade,axial stress monitored by pressure sensor increased first-ly then decreased,and stress concentration dissipated during compacting process of loose rock mass.With the increasing of load,the incre-ment of compressive deformation decreased. Under the fixed load, the unsaturated loose rock mass which had no deformation any more would deform rapidly and obviously affer water injection,which could lead to the secondary deformation of the surface of goaf.
Keywords：goafloose rock massnatural statesaturated statecompaction test
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 17-20,128 )