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Wave-induced stresses in a saturated poroelastic sea bed beneath a rectangular caisson
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Hydraulic structures 83120~ WAVE-INDUCED STRESSES IN A SATURATED POROELASTIC SEA BED BENEATH A RECTANGULAR CAISSON Mymett, A E; Mei, C C Geotechnique, V32, N3, Sept 1962, P235-2~7 Sea waves incident on a rigid caisson induce stresses in the sea bed by the direct action of wave ~essure and by the vibration of the caisson. Under t h e asst~ption that t h e sea bed is an isotropic p~ro-elastic half-s~ace safe,rated with water, the d ~ e s of the two lmhases are governed by Blot's equations. To circumvent the difficulties of solving the coupled equations an al~l~r~ximate scheme is applied to achieve an analytic solution. The problem can first be reduced to a series of classical elastostatic l~oblsms which can be solved by complex variables, a~i then ccrrecte~ for seepage near the mudline. Ntm~rical results are l~esente~. Auth.
Earth retaining structures 83z2o5 D
E ~
PROGRAMME FOR THE DESIGN OF RETAINING
wAus uslm ~E M~LI (ZN Z ~ H )
AND METAL WEAR IN TUNNELB(~ING MACHINES: ANALYSIS OF TUNNEL-BC~ING OPERATION IN HARD ROCK Cassinellij F; Cima~ S; Inr~urato, N In: ~ l l i n g 82, Proceedings of the 3rd International Sympositln, Brighton, 7-11 June 1982, P73-81. Publ London: IMM, 1982 Data on energy cons~mptionj metal wear and machir~ perfcrme_nce relating to a tunnel-boring machine used in granitic gneiss in the western Alps, Italy, are l~esented. These data are analysed, together with data from structural investigations in the tunnel ~ from lab tests, to try add co~relate TB~ performnce with geological conditions and the rock geotechnical ~roperties.
83.1.209 TUNNEL-BORING
Presents the DENEBOLA I ~ o ~ for the design of retaining walls and piling, using the moduli of reaction method. The various re~esentatione adopted to model the mechanism of func1~ioning of these structures by this method are described and reference is made to the numerical ~ocess of resolution. The design of a cast-in-situ qus~ wall is ~esented as an example of a typical application of this ~rogra~me.
Influence of dynamic loads due to explosions or earthquakes 831206 SEISMIC
STABILITY OF THE REVELSTO~E EARTHFILL DAM Ehilmani, K S; Byrne, P M; Yeung~ K K Can Geotech J, VI9, N1, Feb 1982, P63-75
Dynamic analyses were performed to determine the susceptibility to failure by earthquake-induced liquefaction of the umd~lylng silt-clay of the dam. A factar of safety against the occtm'renoe of liquefaction failure was determined by comparing the dymamic resistance obtained from cyclic triaxial tests on tu~iisturbed SSml~.es with t h e time histm~y ~f dymamic s t r e s s e s caused by the design earthquakes. Prelimimary amaS s e s revealed thnt t h e silt-clsy beneath the upstream shell ~ o u l d be removed, and partial removal of the silt-clay from the d o w r ~ e a m shell was recc~mer~ed as a l~ecautlon against the unlikely event of liquefaction failure there.
Comminution of Rocks u~
831208 POWER C O N ~ O N
OF ~ H O N
Balay, J; Frank, R; Harfot~che~ L Bull Liaison Lab Ponts Chausees, N 1 2 % JulyAng 1982, P3-12
8Blz~ m m m - ~ s (IN R U b L e )
Hydrators were tested in inclined, thin coal seams Im~one to outbursts. A coal pamel was divided into a n u ~ e r of small pamels by drilling large diameter bor~holes to the raise of the seam, and hydr~monitors with cutting depth r a r e s of 0.2-0.5m were then inserted into the boreholes. No s ~ ~stem was used and the coal was removed by gravity. It is claimed that this system l~events rock and gas bursts.
IN a n m ~
~oE
~A~
Luk~er~ko# E S Ugol Ukralr~, ~ , AI~II 1981, P28"29
MACHINE PAYMENT ON BASIS OF ACTUAL ROCK QUALITY EFFECT Beckmann, U; simons, H In: Tu~nelllng 82, Proceedings of the 3rd International Symposia, Brighton, 7-11 June 1962, P261-264. Publ London: IMM, 1982 A rock mass classification related to rock mass stability is not sufficient basis far turmel bc~ing machine (THM) payment: boreability of the ground plays an additional economic role. Cutter wear is dependent on the penetration rate of the TBM which is a function of boreability. A combined classification system that consists of rock stability and rock boreability classes in the form of a matrix is l~oposed for Iractical use in tenders and illustrated by an e~ample.
Drilling 83z2lo MICROCCMIT~iER SIMULATION OF STRESS WAVE ENERGY TRANSFE~ TO ROCK IN PERCUSSIVE DRILLI~ Lundberg, B Int J Rock Mech Min Sci, V19, NS, Oct 1982,
P229-239 An Apple II Plus microcomputer with high resolution graphics is used to simulate stress wave energy transfer to rock in percussive drilling. The drilling model is based on one-dimensional stress wave theo~y for the rod ar~ bit, and on a nonlinear history-dependent force/penet~atlon relationship for the bit/rock interaction. Input data are given for rod, bit, inoident wave and bit/rock interaction. The use of the simulation ~ o g r a m 'Bit' is illustrated by studying the influence of bit mass and shape on drill-bit efficiency. For the bits chosen mass is shown to be a far more important parameter than shape.
831211 PROBABILITY OF ENCOU~'I'~ING C O ~
DISCONTINUITIES DURINg; VERTICAL AND HC~IZONTAL BOREHOLE DRILLI~ Houseknech% D W US Bureau of Mines repart RI 8665, 1982, 21P
Hydraulic structures 83120~ WAVE-INDUCED STRESSES IN A SATURATED POROELASTIC SEA BED BENEATH A RECTANGULAR CAISSON Mymett, A E; Mei, C C Geotechnique, V32, N3, Sept 1962, P235-2~7 Sea waves incident on a rigid caisson induce stresses in the sea bed by the direct action of wave ~essure and by the vibration of the caisson. Under t h e asst~ption that t h e sea bed is an isotropic p~ro-elastic half-s~ace safe,rated with water, the d ~ e s of the two lmhases are governed by Blot's equations. To circumvent the difficulties of solving the coupled equations an al~l~r~ximate scheme is applied to achieve an analytic solution. The problem can first be reduced to a series of classical elastostatic l~oblsms which can be solved by complex variables, a~i then ccrrecte~ for seepage near the mudline. Ntm~rical results are l~esente~. Auth.
Earth retaining structures 83z2o5 D
E ~
PROGRAMME FOR THE DESIGN OF RETAINING
wAus uslm ~E M~LI (ZN Z ~ H )
AND METAL WEAR IN TUNNELB(~ING MACHINES: ANALYSIS OF TUNNEL-BC~ING OPERATION IN HARD ROCK Cassinellij F; Cima~ S; Inr~urato, N In: ~ l l i n g 82, Proceedings of the 3rd International Sympositln, Brighton, 7-11 June 1982, P73-81. Publ London: IMM, 1982 Data on energy cons~mptionj metal wear and machir~ perfcrme_nce relating to a tunnel-boring machine used in granitic gneiss in the western Alps, Italy, are l~esented. These data are analysed, together with data from structural investigations in the tunnel ~ from lab tests, to try add co~relate TB~ performnce with geological conditions and the rock geotechnical ~roperties.
83.1.209 TUNNEL-BORING
Presents the DENEBOLA I ~ o ~ for the design of retaining walls and piling, using the moduli of reaction method. The various re~esentatione adopted to model the mechanism of func1~ioning of these structures by this method are described and reference is made to the numerical ~ocess of resolution. The design of a cast-in-situ qus~ wall is ~esented as an example of a typical application of this ~rogra~me.
Influence of dynamic loads due to explosions or earthquakes 831206 SEISMIC
STABILITY OF THE REVELSTO~E EARTHFILL DAM Ehilmani, K S; Byrne, P M; Yeung~ K K Can Geotech J, VI9, N1, Feb 1982, P63-75
Dynamic analyses were performed to determine the susceptibility to failure by earthquake-induced liquefaction of the umd~lylng silt-clay of the dam. A factar of safety against the occtm'renoe of liquefaction failure was determined by comparing the dymamic resistance obtained from cyclic triaxial tests on tu~iisturbed SSml~.es with t h e time histm~y ~f dymamic s t r e s s e s caused by the design earthquakes. Prelimimary amaS s e s revealed thnt t h e silt-clsy beneath the upstream shell ~ o u l d be removed, and partial removal of the silt-clay from the d o w r ~ e a m shell was recc~mer~ed as a l~ecautlon against the unlikely event of liquefaction failure there.
Comminution of Rocks u~
831208 POWER C O N ~ O N
OF ~ H O N
Balay, J; Frank, R; Harfot~che~ L Bull Liaison Lab Ponts Chausees, N 1 2 % JulyAng 1982, P3-12
8Blz~ m m m - ~ s (IN R U b L e )
Hydrators were tested in inclined, thin coal seams Im~one to outbursts. A coal pamel was divided into a n u ~ e r of small pamels by drilling large diameter bor~holes to the raise of the seam, and hydr~monitors with cutting depth r a r e s of 0.2-0.5m were then inserted into the boreholes. No s ~ ~stem was used and the coal was removed by gravity. It is claimed that this system l~events rock and gas bursts.
IN a n m ~
~oE
~A~
Luk~er~ko# E S Ugol Ukralr~, ~ , AI~II 1981, P28"29
MACHINE PAYMENT ON BASIS OF ACTUAL ROCK QUALITY EFFECT Beckmann, U; simons, H In: Tu~nelllng 82, Proceedings of the 3rd International Symposia, Brighton, 7-11 June 1962, P261-264. Publ London: IMM, 1982 A rock mass classification related to rock mass stability is not sufficient basis far turmel bc~ing machine (THM) payment: boreability of the ground plays an additional economic role. Cutter wear is dependent on the penetration rate of the TBM which is a function of boreability. A combined classification system that consists of rock stability and rock boreability classes in the form of a matrix is l~oposed for Iractical use in tenders and illustrated by an e~ample.
Drilling 83z2lo MICROCCMIT~iER SIMULATION OF STRESS WAVE ENERGY TRANSFE~ TO ROCK IN PERCUSSIVE DRILLI~ Lundberg, B Int J Rock Mech Min Sci, V19, NS, Oct 1982,
P229-239 An Apple II Plus microcomputer with high resolution graphics is used to simulate stress wave energy transfer to rock in percussive drilling. The drilling model is based on one-dimensional stress wave theo~y for the rod ar~ bit, and on a nonlinear history-dependent force/penet~atlon relationship for the bit/rock interaction. Input data are given for rod, bit, inoident wave and bit/rock interaction. The use of the simulation ~ o g r a m 'Bit' is illustrated by studying the influence of bit mass and shape on drill-bit efficiency. For the bits chosen mass is shown to be a far more important parameter than shape.
831211 PROBABILITY OF ENCOU~'I'~ING C O ~
DISCONTINUITIES DURINg; VERTICAL AND HC~IZONTAL BOREHOLE DRILLI~ Houseknech% D W US Bureau of Mines repart RI 8665, 1982, 21P