Study on the Deformation Mechanisms of the Surrounding Rock and Its Supporting Technology for Large Section Whole Coal Cavern Groups

The control difficulty of whole coal cavern groups is greatly increased due to the characteristics soft rock with low strength, large sections, and mutual influence crossed groups. section gas storage group taken as research background. In this paper, equivalent circle method used solve loose a rectangular roadway, numerical calculation obtain deformation stress distribution laws surrounding under excavation conditions (WCCG). failure mechanisms are revealed linkage impact between stratified reinforcement ring concept “long cable-bolt-grouting” (LBG) was proposed for stability in WCCG. On roof groups, supporting configuration high-strength bolt high pre-tightening force anchor were determined. two sides floor WCCG, grouting scheme These configurations both sidewalls applied group. results show that presents asymmetric area complex structure. Tensile mixed tensile-shear mainly occur shallow part rock, while shear occurs deep rock. displacement curves symmetric saddle low- high-negative pressure caverns, respectively. maximum displacements on left right roof. range rings 3.34 m 2.54 m, respectively, ribs. support technology LBG can effectively reduce depth stable state. study provide theoretical basis layout