Ground subsidence induced by pillar deterioration in abandoned mine districts

When roadways are constructed above or adjacent to heavily mined regions, the ground subsidence caused by pillar collapse inflicts severe damage on these roadways. In this study, some surface subsidence events were first reviewed to present roof caving characteristics caused by pillar failure. The b...

Full description

Saved in:
Bibliographic Details
Published in:Journal of Central South University 2020-07, Vol.27 (7), p.2160-2172
Main Authors: Luo, Rong, Li, Guang-yue, Chen, Lu, Yang, Qi-yi, Zang, Chuan-wei, Cao, Wen-zhuo
Format: Article
Language:English
Subjects:
Abandoned mines
Bearing capacity
Compressive strength
Computer simulation
Cutting parameters
Damage
Degradation
Discontinuity
Engineering
Metallic Materials
Pillar failure
Road construction
Roof failures
Roofs
Shear forces
Slippage
Spalling
Subsidence
Support systems
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:When roadways are constructed above or adjacent to heavily mined regions, the ground subsidence caused by pillar collapse inflicts severe damage on these roadways. In this study, some surface subsidence events were first reviewed to present roof caving characteristics caused by pillar failure. The bearing characteristic and failure pattern of a single pillar with or without effect of discontinuity were further numerically simulated using distinct element code (3DEC). It was found that the spalling of pillar or slippage of discontinuity would damage the bearing capacity of pillar during the failure process. The stress at the pillar core could be greater than uniaxial compressive strength of the pillar. However, when a discontinuity runs through a pillar, the slippage of discontinuity would significantly degrade the bearing capacity of the pillar. In pillar support system, if any pillar unexpectedly degrades or loses its bearing capacity, the load transferred from the degraded pillar acts on neighboring pillars, and the shear force also increases at relevant positions. However, the roof cutting and surface subsidence characteristics would perform in different patterns. In some cases, surface subsides slowly; in the worst scenario, shock bump may be induced by pillar and roof collapse.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-020-4438-3