Numerical simulation of approach rock stability under interlocking vertical mining of adjacent layered approaches
Aiming at the stability problem in the surrounding rock of the adjacent layered staggered vertical mining conditions during the downward layered filling mining,a stress model of the surrounding rock structure of the excavation was established,and the influence characteristics of the backfill roof on the stability of the surrounding rock under different mining conditions were analyzed,then the mechanical state of the backfill roof under the third-stage excavation was obtained.Using FLAC3D numerical simulation,the stress evolution characteristics of the surrounding rock under the"third-stage"tunneling mining in the lower layer were analyzed.The results show that during the backfilling process of the first and second stages of the lower layer,the horizontal stress on the side walls of the two ore bodies is distributed in a camel hump shape in the direction of advancement.In the first stage,the vertical displacement of the two sides of the roadway shows symmetrical positive and negative values.During the third stage of the excavation process,the unmined ore body carries increasing overlying loads,and the risk factor gradually increases.Due to the impact of mining,the stability of the lower layer edge access is poor,especially for the mining of edge accesses without backfill roofs.The rock mass stability is poor and the risk factor is high,so it is necessary to strengthen support during backfilling.
staggered vertical miningsurrounding rock stabilitycementitious filling methodno false top edge route
NETL
NSTL
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