Field Measurements Of Overburden And Chain Pillar Response To Longwall Mining

Su, Daniel W. H.
Organization: International Conference on Ground Control in Mining
Pages: 16
Publication Date: Jan 1, 1987
This paper presents the results of an extensive geomechanical testing and monitoring program conducted at a longwall panel. The field program included the monitoring of roof caving sequence and mechanism, surface subsidence, change of pillar stress, roof displacement and entry convergence, and strength characterization of the overburden rocks. The response of eight headgate pillars and the adjacent entries was monitored as the longwall face approached and passed the instrumented locations. Overburden response to longwall mining was monitored using time domain reflectometry (TDR) technology; and, the height of the highly fractured zone above the gob was determined by postmining drilling. Good correlation was found between the height of the highly-fractured zone and the TDR, subsidence, and pillar stress data. The results provide a detailed picture of the response of overburden strata and chain pillars to longwall mining. A preliminary model representing the overburden strata behavior at the test site in response to the longwall mining is proposed.
Full Article Download:
(2953 kb)


Additional chapters/articles from the SME-ICGCM book Proceedings 6th International Conference on Ground Control in Mining (ICGCM) 6th

Microseismic Monitoring of Mountain Bumps and Bounces: A Cas
Factors Influencing the Occurrence of Coal Pillar Bumps at
Longwall Pace Bursts and Inadequate Caving: A Came Study
Mine Layout Deign for Coal Bump Control
The Strong Outbursts of Coal and Gas in Coal Mines in China
Bock Bursts Occurrence. in the Coeur D'Alene Mining Dis
A History of Bock Burst Research in the Coeur D'Alene M
Chemical Destressing to Alleviate Rockbursts
Rockburst Control Measures at INCO's Creighton Mine
Prevention. Control and Management of Coal and Gas Outbursts
Application in Design for Close Proximity Multi-Seem Mining
Geologic Conditions Affecting Mineability in the Jane Mine.
Analysis of Cutter Roof Using the Boundary Element Method
A Novel Ground Control Program at Plateau Mining Company
Evaluation of Anchorage Integrity for Grouted Bolts in Weak
STRATA III ? A Full-Spectrum Roof Control Concept
Study of Ground Movement Over a Longwall Mine
Field Measurements of Overburden and Chain Pillar Response t
A Method for Sizing Longwall Pillars Based on Field Measurem
Aspects of Chain Pillar Design in Relation to Longwall Minin
The Initial Collapse of the Overburden Over Longwall Panels
Monitoring and Prediction of Ground Movements Above Undergro
Mechanisms of Chimney Subsidence Over Abandoned Coal Mines
Time-dependent Behavior of Immediate Weak Floor Strata from
The Significance of Specimen Stiffness and Post Yield Charac
Frictional Properties of Rock Applied to Mining Excavations
Ice Pillars, Packwalls, and Brattices
Investigation of Subsidence Over AML: A Case Study
Deign of Support System for Mining Tunnels in Carboniferous
Support of Tunnels in South African Gold Mines
The Stress Measurement and Underground Engineering
Field Measurements Of Overburden And Chain Pillar Response T