Deformation of the rocks near a mineshaft

55A

783061 ST(RING OIL IN ROCK CAVerNS Wimdolf, G Min Mag, V137, ~ , Nov 1977, I~I-5~5 D i s c u s s e s Swediah practice~ imluding a case stu~7 of a project a% Loudden~ near Stockholm, amd briefly reviews t h e recent Rockstore 77 conference, held in Stockholm on 5-8 Sept 1977. 783062 G E ~ PRINCIPLES OF U~DERGROUND OPENING DESIGN IN C O M P E V ~ ROCK Duvall, W I In: Mommgraph i on Rock Mechanics Applications in Miming (New York" A I ~ 1977),PI01-III This paper discusses general principles of umdergroumd opening design based on the concept that with the necessary impu% date regarding the geology of a site~ the physical properties of the rocks, the in situ stress field in the rock amd the general geometry of the unlergrourd openings, the rock formation can be classified into six ma~or catergories which are useful for design purposes. Using simple theories for the criteria of failure for rock in coml~ession and tension, general elastic theory for stress concentration arou~l openings amd in structures, beam theory for stability of roof rock, ard elementary inelastic theory for creep phencmer~, basic design techniques are outlined for the various rock classifications. The need far field evaluation of %he theoretical design is stressed and some general techniques that should be used in these field evaluations are discussed. Where appropriate, the need for ndd~tior~l studies and research is noted. Auth.

783063 DESIGN~'S V I E ~ I N 2

OF MEDIL~4-SUPPORT INTERACTION

Ch~ha, S N In: Monograph i on Rock Mechanics Applications in Mining (New York: AIME, 1977), P223-227 Reports a comparative study of methods of analysis and design of concrete linimg for umdergrour~l openings in rock. Concludes that a ldimensional stiffness matrix approach gives satisfactery results for amnl ! openimgs, but for large openings and when the rock quality is questionable, finite element analysis is warr8_~.

Mines See a l s o : 783084 783064 EXAMINATION OF SOME THEORIES OF EARTH PRESSURE ON ~ LININGS Prater, E G Can Geotech J, VI4, NI, Feb 1977, P91-I06 Various thearies far determining the earth pressure on shaft linings in cohesionless soils are discussed, and results are presented for a Coulomb-type analysis with a conical sliding surface. The assumed shape of the failure surface approximates closely the one give in published results obtained by the method of characteristics. The simplicity of the cone permits an investigation of a ~ h e r Of parameters, e.g. the earth pressure coefficient on radial planes, which turns out to be a decisive parameter in the amalysis, and accounts fer the widely differing published values for earth pressures on shaft limings. Certain thearies could iced, especially at greater depths, to rather conI~\~\i,

153

i

servative designs. A similar theory is also pre~ed f ~ earth pressures on shafts in cohesive soils. In %his case %he possibility of b a ~ f a i l ~ must be considered as well, ar~ i% is shown tha% this might be %he deciding failure mechamimm. 783o65 V ~ I C A L CRATER RETREAT - AN Da~3RTANT NEW ~ NING METHCD Lez~, L C; Roach, R J; OsoMo, M N Can Min J, V98, Ng, Sel~ 1977, P69-77 Discusses the method in which vertical largediameter (!6.5cm) holes are drilled on a designed pattern from a cut over a stops or pillar to bo%tom in t ~ hack of the umdercut. Spherical charges are placed within these holes at the calculated o p t i ~ diatance from the b ~ k of the uni~cut, amd a ver%ical thickness of ore is blasted downwards into the previously mi~ed area. 783066 DEFC~ATION OF THE ROCKS NEAR A MINESHAFT Chermyahev, V E SOy Min Sci, VI3, NI, Jan-Feb 1977 , P7-12 A dynamics approach to the problem, based on a s%%~ly of shafts in the central Dombass region. 783067 ENGINEERING C ~ I O N OF GAS BURST PARAMETB~S Omopchuk, B N Soy Min Sci, VI2, NS, Sept-Oct 1976, P ~ - 4 8 7 783068 SUDDEN OUFBL~STS OF METHANE AND COAL S~bie~ J Colliery Guard, V226, NI, Jan 1978, P39-50 Briefly revi~s factors contributing to o~tbursts a~d their detection a~d prevention, and describes an incident at the Killoch Colliery in Ayrshire, Scotland. 783069 DESIGN CONSIDI~RATIONS FOR MINING THICK SEAMS AND SEAMS LYING IN CLOSE PROXIMITY TO ONE ANG2HER Wilson, J W; Simgh, B D; NakaJima, S In: Monograph 1 on Rock Mechanics Applications in Mining (New York: AIME, 1977), P3-13 Considers mining thick seams by lomgwall methods, room system, sublevel caving, and slicing (with hydraulic sand stowing). 783070 IO~ISER RESOURCES LTD HYDRAULIC COAL MINE Shaw, J D In: Monograph 1 on Rock Mechanics Applications in Mining ( N ~ York: AIME, 1977), P14-20 783O71 MULTIPLE SEAM MINING Spedling, M In: Monograph i on Rock Mechanics Applications in Mining (New York: AIME, 1977), P22-28 Briefly surveys UK practice in multiple seam coal mining. 783072 ROCK MECHANICS ELEMENTS OF COAL MINE DESIGN Dahl, H D; Von Schonfeldt, H A In: Monograph 1 on Rock Mechanics Applications in Mining (New York: AIME, 1977), P31-39 Considers some design techniques that are being used in imdustry for improv~ roof and ground control, concentratimg on a modelling technique including elastic-frictional plastic atreasstrain relations in which the yield comdition is a function of confining pressure. The technique has been applied to longwall develop-