Influence of temperature and non-elastic behaviour on roof collapse and subsidence resulting from underground coal gasification

Journal Article · Sat Jan 01 04:00:00 EST 1983 · In Situ; (United States)

OSTI ID:5535830

Jegbefume, E U; Thompson, T W

The effects of various factors on the roof collapse and subsidence resulting from the development of an underground coal gasification cavity are examined. These factors include drying of the surrounding rocks, thermal loading, thermal softening and time-dependent rock mechanical properties. These investigations have been conducted with the aid of a 2-D plane strain finite element model. It is shown that drying effects are largely offset by the resulting tendency towards roof collapse, while thermal stress effects are largely negated by thermal softening. For elastic overburden, roof collapse has the major influence on surface subsidence. Creep of the overburden increases the surface subsidence both in terms of vertical movements and horizontal strains.

• OSTI ID: 5535830
• Journal Information: In Situ; (United States), Journal Name: In Situ; (United States) Vol. 7:2; ISSN ISOMD
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
010900* -- Coal
Lignite
& Peat-- Environmental Aspects
CAVING
CAVITIES
COAL GASIFICATION
FINITE ELEMENT METHOD
GASIFICATION
GROUND SUBSIDENCE
IN-SITU GASIFICATION
IN-SITU PROCESSING
MATHEMATICAL MODELS
MECHANICS
NUMERICAL SOLUTION
OVERBURDEN
PROCESSING
ROCK MECHANICS
ROOFS
STRATA MOVEMENT
STRESSES
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES