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The Ampricor hydro power plant in Canada
78A
730 NEUHAUS,W The remote effects of a workimg element in the case of e l a s ~ a s t i c rock. In German. 10F~I2R.
GLUCKAU~-FC~.z~, OCT.197~,P199-205. The iso~ropic elastic semIplane and the solution of marginel values are considared in deriving the rock stresses for a circular tulmmel: ADnulment of rad/al and margimal stresses ard subsidences and dislocations in the rock an~ a% the surface are discussed. The deper~nce of the functions of influence on depth ar~ reduction of the field of subsidence and dislocation are considered. 731 SAU~,G JONUSCHEIT,P Stress redistribution in the middle wall between tubes of a twin-tunnel during symchronous excavation. In German: IOF,10R. ROCK MECH.V8,NI,1956,PI-22. Twin or mc~e t u b e t m ~ e l s a r e becoming more a s d more common than simgle t ~ e % ~ s in transpc~-t-rm~l systems due t o r e a s o n s c o ~ d w i t h t h e s a f e t y , ~ranslXn~ r a t i o n a~d e c o n c ~ o f c o n s t r u c t i o n . The r o c k mass b e t ween the two closely lying tunmels is a critical zone in ~he static system "rock mass ard the turmel llni~" ~eularly because of the lack of knowledge re@mrdirg the s t r e s s a~l d e f e c a t i o n I n ~ c e s s e s d u r i ~ excavation. The i n - a i t u measurements carried out at F r a n k f t w t / M a i n show ~ h a t stresses in e a s e o f a two dimensiomal load~ng are substantially ~ e r than those in case of three dimensional; Ftu'the~ the reduction in meas1~ed peak s~esses of the ~hree dimensional s t ~ p c ~ i ~ arch arounl the excavation face first began 2,5 to 3 tunnel diameters behind it; The pressure which increased in the middle wall a ~ on the side walls due to the imward movement of the excavation face decreased partly with the slow overall reduction in stresses ( s h r i r ~ ard creep of ahotcrete llnim~) amd simultaueous redistribution of the stress field aromxl the excavation, Auth.
Power plants 732 MCKECHNIE,AL
A~N,
EH
The A ~ i o r h ~ r o power plant in C a ~ a ; ~ . WAT.~/R AND DAM CO~STR.A~.I97~,P286-~90. In-situ stresses a n d stress a r o u n d
underground o~en|ngs 733 NIGAM,PA
~,MB Three-dimensional analysis of h~droelectric power station: 17F~IT~12R. J. P O W ~ DIV.ASCE,VA02, NPOI,i~76,P~'52. A three-~onal pho~oelastie ~echnique was used to determiue the six ccm~cments of stress at each of 12,000 points aroumd a h~Iroelectric ix~ar station umder a static genarator loed; The r e s u l ~ s~eas ~.Istri1~io~ was q u i t e different from that l~edicted by t ~ a i o r a l ~l~:Toe~hes e
735 ~ I S , DH SXIENHAMsPH Nanoatraln sensitivity ccrehole extenscmetar for insitu rock psrametar measurements. 3F,2R. J.PHYS.E, SCI.INSTR.Vg,I~3,1976,P170-171. A mechanical straimmeter is described that will resolve nanoatrain effects in host rock. It is loaded into a 26ram diameter corehole, measurir~ strains deep in the hole over an interval of lm. Typical stability, once settled, is 5 parts in l0 to the 10th per hour drift. The resolution of the electrical output signal is at least lmm with frequency response set for DC ÷.o 1Hz. Auth. 736 GLAIN/IN,MT UNIV. QUEENSLAND,AUS Ultrasonic stress monitoring in active sites. Observation of the time deperdence of stress relief mechanisms in minir6 pillars. Abstract. Paper T.57. FALL ANN.~',ING 197~.TRANS.AM.GEOPHYS.UN.V56~N12, 1974,P1192. A method of measuring with nanosecond precision t h e times of flight of ultrasonic pulses in rock over distances of a few metres has been used in an active mire (with a high level of acoustic backgrourd reference) to examine the increased stress loading in support pillars accompanyirg mining excavation. The i n ~ m e n t is installed in 8 cm boreholes to minimise disturbance of the measured stress field. In a quiet environment, contimuous triaxiel stress monitoring to lOS N m-2 ~ppears possible. The method has less ambiguity than strain monitcrirg as an indicator of accumulated elastic energy in tectonic studies.
Surface subsidence and caving 737 FCRE~A~,DJ WnA'A-,'A~,BN Effects of mimlrg subsidence on colliery spoil heaps. l.Minirg subsidence and gectechnical aspects of spoil heaps and their l o t i o n s . 3F,2T,20R. INT.J.ROCK MECH.MIN. SCI.G~.ABSI~.VI3,1~,APR. I~76,PI13-120. 738 FORRE~A'~,DJ
~ , B N Effects of mining s~sidence on colliery spoil heaps: II Deformatiomsl behaviour of spoil heaps durir~ unlermlnir~. 12F,6T,6R. IN~.J.ROCK ~CH. MIN. SCI.G E O ~ . ABSTR,VI3,N~,APR. 1976,P121-133. 739 SPICK~RNAGEL,H Lif~i~ of the rock in conseq~nce of mlnir6 operations ~ ~ . In Ger~u~. 8Fj21R. GI/rKAUF-FORSu~w% Ate.1975,P170-175. Liftir6 at the surface in consequence of the formation of subsidence trou@hs is described. Creepi~ t u ~ e r ~ due to coal wir~r~ ~ liftir~ above idle coalfields are also discussed.
Temporary and permanent supports
7~
74o
l~IO~, JD GEOL. SI~RV.I~.~TON,VIRGINIA,USA WOI~,RG GE~L.~ .~NV~, COIERADO,USA EEYS,WS GEC~. S ~ . ~ , COLDRADO,USA H~Iraulie fracturing to determine the regiomsl insitu stress field, Picee~ce Basir~ Colorado. 17F,18R.
GAU2~ jH Yieldir~ shaft lini~s. In Polish; PRZEGL.GORN.V32,RI~1976 aP22- 25. A short review is ~ e ~ of yieldi~ ahs_~ su~xrts used ecene~elally which make warki~g of shaft pillars possible. ~he llnlr~s arm dlvldedln~o those used in over-
GEOL. S0C.A~%~t~A .V87,~, 1976,~50-2~8.
730 NEUHAUS,W The remote effects of a workimg element in the case of e l a s ~ a s t i c rock. In German. 10F~I2R.
GLUCKAU~-FC~.z~, OCT.197~,P199-205. The iso~ropic elastic semIplane and the solution of marginel values are considared in deriving the rock stresses for a circular tulmmel: ADnulment of rad/al and margimal stresses ard subsidences and dislocations in the rock an~ a% the surface are discussed. The deper~nce of the functions of influence on depth ar~ reduction of the field of subsidence and dislocation are considered. 731 SAU~,G JONUSCHEIT,P Stress redistribution in the middle wall between tubes of a twin-tunnel during symchronous excavation. In German: IOF,10R. ROCK MECH.V8,NI,1956,PI-22. Twin or mc~e t u b e t m ~ e l s a r e becoming more a s d more common than simgle t ~ e % ~ s in transpc~-t-rm~l systems due t o r e a s o n s c o ~ d w i t h t h e s a f e t y , ~ranslXn~ r a t i o n a~d e c o n c ~ o f c o n s t r u c t i o n . The r o c k mass b e t ween the two closely lying tunmels is a critical zone in ~he static system "rock mass ard the turmel llni~" ~eularly because of the lack of knowledge re@mrdirg the s t r e s s a~l d e f e c a t i o n I n ~ c e s s e s d u r i ~ excavation. The i n - a i t u measurements carried out at F r a n k f t w t / M a i n show ~ h a t stresses in e a s e o f a two dimensiomal load~ng are substantially ~ e r than those in case of three dimensional; Ftu'the~ the reduction in meas1~ed peak s~esses of the ~hree dimensional s t ~ p c ~ i ~ arch arounl the excavation face first began 2,5 to 3 tunnel diameters behind it; The pressure which increased in the middle wall a ~ on the side walls due to the imward movement of the excavation face decreased partly with the slow overall reduction in stresses ( s h r i r ~ ard creep of ahotcrete llnim~) amd simultaueous redistribution of the stress field aromxl the excavation, Auth.
Power plants 732 MCKECHNIE,AL
A~N,
EH
The A ~ i o r h ~ r o power plant in C a ~ a ; ~ . WAT.~/R AND DAM CO~STR.A~.I97~,P286-~90. In-situ stresses a n d stress a r o u n d
underground o~en|ngs 733 NIGAM,PA
~,MB Three-dimensional analysis of h~droelectric power station: 17F~IT~12R. J. P O W ~ DIV.ASCE,VA02, NPOI,i~76,P~'52. A three-~onal pho~oelastie ~echnique was used to determiue the six ccm~cments of stress at each of 12,000 points aroumd a h~Iroelectric ix~ar station umder a static genarator loed; The r e s u l ~ s~eas ~.Istri1~io~ was q u i t e different from that l~edicted by t ~ a i o r a l ~l~:Toe~hes e
735 ~ I S , DH SXIENHAMsPH Nanoatraln sensitivity ccrehole extenscmetar for insitu rock psrametar measurements. 3F,2R. J.PHYS.E, SCI.INSTR.Vg,I~3,1976,P170-171. A mechanical straimmeter is described that will resolve nanoatrain effects in host rock. It is loaded into a 26ram diameter corehole, measurir~ strains deep in the hole over an interval of lm. Typical stability, once settled, is 5 parts in l0 to the 10th per hour drift. The resolution of the electrical output signal is at least lmm with frequency response set for DC ÷.o 1Hz. Auth. 736 GLAIN/IN,MT UNIV. QUEENSLAND,AUS Ultrasonic stress monitoring in active sites. Observation of the time deperdence of stress relief mechanisms in minir6 pillars. Abstract. Paper T.57. FALL ANN.~',ING 197~.TRANS.AM.GEOPHYS.UN.V56~N12, 1974,P1192. A method of measuring with nanosecond precision t h e times of flight of ultrasonic pulses in rock over distances of a few metres has been used in an active mire (with a high level of acoustic backgrourd reference) to examine the increased stress loading in support pillars accompanyirg mining excavation. The i n ~ m e n t is installed in 8 cm boreholes to minimise disturbance of the measured stress field. In a quiet environment, contimuous triaxiel stress monitoring to lOS N m-2 ~ppears possible. The method has less ambiguity than strain monitcrirg as an indicator of accumulated elastic energy in tectonic studies.
Surface subsidence and caving 737 FCRE~A~,DJ WnA'A-,'A~,BN Effects of mimlrg subsidence on colliery spoil heaps. l.Minirg subsidence and gectechnical aspects of spoil heaps and their l o t i o n s . 3F,2T,20R. INT.J.ROCK MECH.MIN. SCI.G~.ABSI~.VI3,1~,APR. I~76,PI13-120. 738 FORRE~A'~,DJ
~ , B N Effects of mining s~sidence on colliery spoil heaps: II Deformatiomsl behaviour of spoil heaps durir~ unlermlnir~. 12F,6T,6R. IN~.J.ROCK ~CH. MIN. SCI.G E O ~ . ABSTR,VI3,N~,APR. 1976,P121-133. 739 SPICK~RNAGEL,H Lif~i~ of the rock in conseq~nce of mlnir6 operations ~ ~ . In Ger~u~. 8Fj21R. GI/rKAUF-FORSu~w% Ate.1975,P170-175. Liftir6 at the surface in consequence of the formation of subsidence trou@hs is described. Creepi~ t u ~ e r ~ due to coal wir~r~ ~ liftir~ above idle coalfields are also discussed.
Temporary and permanent supports
7~
74o
l~IO~, JD GEOL. SI~RV.I~.~TON,VIRGINIA,USA WOI~,RG GE~L.~ .~NV~, COIERADO,USA EEYS,WS GEC~. S ~ . ~ , COLDRADO,USA H~Iraulie fracturing to determine the regiomsl insitu stress field, Picee~ce Basir~ Colorado. 17F,18R.
GAU2~ jH Yieldir~ shaft lini~s. In Polish; PRZEGL.GORN.V32,RI~1976 aP22- 25. A short review is ~ e ~ of yieldi~ ahs_~ su~xrts used ecene~elally which make warki~g of shaft pillars possible. ~he llnlr~s arm dlvldedln~o those used in over-
GEOL. S0C.A~%~t~A .V87,~, 1976,~50-2~8.