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Based on the movement regularity of surrounding rock with road-in packing of gob-side entry retaining in fully-mechanized sub-level caving face (RPGERFCF), the mechanical model of its surrounding rock was established and the calculating formulas of the deformation of the roof, coal wall and filling body were attained. By the mechanical analysis to the deformation of the surrounding rock of RPGERFCF, the major factors influencing the deformation of the surrounding rock were found out and the technologic approaches reduced the deformation and enhanced the stability of the surrounding rock were put forward. Consequently, the scientific bases were provided for the stability control of the surrounding rock of RPGERFCF. [ABSTRACT FROM AUTHOR]

To solve the problem of surface subsidence caused by mining, the main method is to reasonably process coal mining space. “Mining caving zone high-pressure grouting pulverized coal ash hydromass controlling roof and overlying strata movement” technology is one of processing methods. After grouting pulverized coal ash hydromass in mining caving zone, formed one kind of special material which is used to support roof and effectively control the subsidence of overlying strata. For the accurate calculation of roof mining subsidence at grouting state, based on the characteristics of such materials, established its constitutive equation based on certain assumptions, gave deformation calculation method when the compound rock supports overlying strata, lay foundation for the actual calculation of subsidence of overlying strata after grouting and the promotion of mining caving zone grouting technology. [ABSTRACT FROM AUTHOR]