Ground Behaviors Analysis of a Stope Covered by the Thin Bedrock and Large-Thick Alluvium: A Case Study

Abstract

Support crushing and roof fall accidents frequently occur in the large mining height stope covered by the thin bedrock and large-thick alluvium (TBLA). A comprehensive method including field monitoring, numerical modelling, and theory analysis was performed to investigate the strata movement and its induced ground behaviors of a deep-buried stope under TBLA. The filed measurement results indicated that strong roof periodic weighting phenomenon occurred regularly at an interval of 18–23 m during panel 3301 retreating. During weighting period, dynamic characteristics of hydraulic supports are prominent and characterized by high safety valve opening rate and poor working conditions including tilt down operation and excessive end distance. Additionally, numerical modelling results revealed that the thickness of bedrock affects the movement behaviors of the roof strata and its generated spatial structure significantly. Based on the above results, an integrated control measure was proposed and successfully applied to the test site.

Distribution Law of In Situ Stress and Its Engineering Application in Gateroad Maintenance: A Case Study

“…e anchor cable beam is processed with 14# channel steel (yield strength limit 235 MPa). All the bolts were installed with a spacing of 1,800 mm × 900 mm and two capsule resin K2370 [32][33][34][35]. e large diameter thickened anchor cable tray (bearing capacity 560 kN) is used with the size of 150 mm × 150 mm × 10 mm, and the anchor cable layout is "3-2-3."…”