Abstract
Taking Ping Dingshan Coal Mine Group 12 as an example, this paper explains the system layout, key equipment and backfilling technology in detail. It probes into the characteristic of rock strata movement behavior and surface deformation above the gob area through in-site measurement method. The results show that as the overburden strata are effectively supported by the backfill body in mined out areas, there were no evident phenomena as first weighting or periodic weighting during mining process. Besides, influencing scope of advanced support pressure and the strata behavior degree were much smaller than that of the traditional methods of caving mining. Since overburden strata had been well supported by backfill body, it shows the posture of sinking slowly, only resulting in bending zone and minor fracture zone.
Highlights
The “three-under” accounts for a significant portion of coal reserves in China and, seriously restricts the recovery rate
According to an uncompleted statistics, ‘Three-unders’ coal storage amounted to 13.79 billion t only in state-owned coal mines, which are mainly concentrated in the eastern mining area
A lot of theoretical researches have been done by some scholars regarding the characteristic of strata movement and surface deformation, the law of strata behavior after backfill mining, it is based on a small portion of field data which is limited to support resistance of hydraulic support (Zhang et al 2010a; Miao et al 2010c), influencing scope of advanced support pressure (Zhang et al 2010b; Miao et al 2010d), the relationship between physical and mechanical characteristics of backfill material and roof subsidence (Zhang et al 2010c; Huang et al 2011b), etc., little efforts have
Summary
The “three-under” (namely coal resources trapped under buildings, railways, and water bodies) accounts for a significant portion of coal reserves in China and, seriously restricts the recovery rate. A lot of theoretical researches have been done by some scholars regarding the characteristic of strata movement and surface deformation, the law of strata behavior after backfill mining, it is based on a small portion of field data which is limited to support resistance of hydraulic support (Zhang et al 2010a; Miao et al 2010c), influencing scope of advanced support pressure (Zhang et al 2010b; Miao et al 2010d), the relationship between physical and mechanical characteristics of backfill material and roof subsidence (Zhang et al 2010c; Huang et al 2011b), etc., little efforts have
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