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Large aggregate shotcrete as tunnel support. Proc. 8th Canadian rock mechanics symposium, Toronto, Nov. 1972
147A
This paper traces a case history of a rock mechanics programme carried out to reinforce an existing ore pass system; Thearotical amd field investigations established that geological features• and critical stresses developed at depth were the principal causes of progressive sloughing of ore pass wells. The attention is directed primarily to the design principles and the practical application of reinforcement measures. The programme developed a new support technology for control of bad grourzl in ir~ccessible areas, stud resulted in significant savings to the operation of the mine. Auth. 1435 MACRAE, AM SMITH AND BRAY,KIN3STON, ONT.CDN Large aggregate shotcrete as tunnel support. Proc. 8th Canadian Rock Mechanics Symposium, Toronto, Nov. 1972. 4F• 3OR. MINES BRANCH, DEPT •ENERGY, MINES, RE SOURCES,OTTAWA, CANADA, 1973, P251- 264. Slm~ayed concrete has been used with remarkable success as pr~mA~y support for underground oPenings in soil and rock; This paper attempts to explain t h e mechanisms involved in the support process• for purposes of er~ineering analysis and liner design. Auth. 1436 TOWN, F Roof s~pport. Patent. UK PATENT N0.I,342,741, FOR W.E. AND F. DOBSON LTD. PUBL. DATE JAN.3.1974° The rate of discharge through a Iressure release valve is able to accelerate by using two discharge valves. The rate of discharge of one valve effects that of the other. The valves are used in props subject to sudden loads;
1437 STANDARD OIL
Mobile roof support unit; Patent. ~K PATENT N0.1,344,7~1, PUBL.DATE JAN.23,197~. A roof support is carried on cr~ler tracks and hydraulically extenis to contact the roof and floor when in position and does not put ar~ load on the tracks.
1438 CHUDEK, M PACH, A Support as a factor of pressure control during mining operations; In Polish. 18F,1T,11R. PRZEGL. GORN.V30, NI•JAN. 1974, P26-35. Equations and nomograms are given which enable the loadbearing capacity of lor~wall supports to be determined. Research carried out in Polish coal mines is described. 1439 FAIRHURST• C SINGH,B Theoretical studies of the stability of a bolted bedded mine roof. In Polish; IIF~IT,IOR. PRZEGL. GORN.V~O, NI,JAN. 1974, P56-6 2. Theoretical analysis has shown that anchors grouted with resin along their whole length are much stronger a~d form better and mare efficient supports for a bedded mine roof. The superiority c@ resin bolts as compared to wedged bolts is stated. 1440 BACKACOU, J RAFFOUX, JF ~,J InsPection of the stability of bolted roadways. In Polish; ~F• IT. PRZEGL. GORN.V30, N1,JAN. 1974, 47- 56. Typical examples of roof subsidence are given and remedial methods discussed; Special attention is paid to constant monitorimg of ~ehors. The work carried out in the Lc~raine Basin is described with details of the inspection system of bolts; The momito~ing system consists of
regular measurements and of transmittim~ the results in form of punched cards to a computer. The computer signals t h e occt~ring hazard. 14~l WHI TTAK~q•BN HLADE,MJ Resin based reinforcement of rocks around m~n~ng excavations in Great ~itain. In Polish.13F•iT, SR. PRZEGL.GORN. V30, N1,JAN. 1974, P38"47 • The consolidation of rocks is estimated on the basis of experiments in mines and research work carried out in the U.K. Particular attention is drawn to the method of fastening bolts by resin injections into long bore_holes. 1~2 THOMS, RL LOUISIANA STATE UNIV.USA CHAR, CV WALK HAYDEL ASSOC.NEW OELEANS,USA B~G)~RON•WJ MCNEESE STATE UNIV.LA.USA Finite element Analysis of rock-salt pillar models. Symposium. In New Horizons in Rock Mechanics. IIF,13R. PROC.14TH SYMPOSYOM ON ROCK MECHANICS,ASCE,NEW YORK, 1973, P393-408. The objective of the research described was to employ the finite element method to model numerically the time depemdent deformation of rock-salt pillar models. The potential practical application of the results of this research wo~id be to predict closure of rooms in salt domes or bedded salt. Such rooms can be used for storage of radioactive or toxic wastes; thus the potential practical application of the m ~ a r i z e d research is currently of great interest. Auth.
1443 PARISEAU, WC UNIV.U~AH, SALT LAKE CITY,USA EEALY, CD UNTV. IDAHO,MOSCOW,USA Support potential of hydraulic backfill. Symposium. In New Hemizons in Rock Mechanics. 7F,~SR. PROC. 14TH SYMPOSITJM ON ROCK MECHANICS•ASCE•N~4 YORK•
1973,P5Ol-526. The results of a prelimimary investigation coneernir~ the support potential of classified mill railings used as backfill in stopes developed by t h e cut-and-fill method of mining are p r e s ~ ; Red~tion in stope convergence and improved grourd control obtainable with practicable mine fills were of primary ~ a n c e . Part 1 of this paper formulates an idealized problem of cut-s/d-fill etopir~ as one in which the final stope configuration is obtained incrementslly through an alternating series of cuts ard fills in an initially stressed medium. Four stoping sequences are examired. The results of these atopir~ sequences in terms of the extent of the failed zone in the stope walls and stope wall convergence or closure are presented in Part 2. These results are disc~ssed in Part 3.
Geological factors of importance in underground excavations DENKHAUS, HG C SIRIPRETORIA, ZA Rock mass classification as a means of predicting rock wall stability. In Polish. 6Fj6T,6R. ~ . GORN.V30, N1,JAN. 1974,P10-19. The problems of rockbursts in urdergroumd mines are discussed referring to roof and wall stability. A systematic classification of rock mass is given accordlmg to mechanical parameters sffecti~ stability. The main parameters are: strength, h t m ~ t y , crmshability, swelling, density of Joir~s, orientation of Joints, weathering, erosion and liability of gas-dust outbursts; An example is given how the classification presented helped to choose ~he right support in a tunrel; ADLERj RE The influence of fabric statisf~ics on teoto~Ics in coal minimg; In German. 6F,31R.
This paper traces a case history of a rock mechanics programme carried out to reinforce an existing ore pass system; Thearotical amd field investigations established that geological features• and critical stresses developed at depth were the principal causes of progressive sloughing of ore pass wells. The attention is directed primarily to the design principles and the practical application of reinforcement measures. The programme developed a new support technology for control of bad grourzl in ir~ccessible areas, stud resulted in significant savings to the operation of the mine. Auth. 1435 MACRAE, AM SMITH AND BRAY,KIN3STON, ONT.CDN Large aggregate shotcrete as tunnel support. Proc. 8th Canadian Rock Mechanics Symposium, Toronto, Nov. 1972. 4F• 3OR. MINES BRANCH, DEPT •ENERGY, MINES, RE SOURCES,OTTAWA, CANADA, 1973, P251- 264. Slm~ayed concrete has been used with remarkable success as pr~mA~y support for underground oPenings in soil and rock; This paper attempts to explain t h e mechanisms involved in the support process• for purposes of er~ineering analysis and liner design. Auth. 1436 TOWN, F Roof s~pport. Patent. UK PATENT N0.I,342,741, FOR W.E. AND F. DOBSON LTD. PUBL. DATE JAN.3.1974° The rate of discharge through a Iressure release valve is able to accelerate by using two discharge valves. The rate of discharge of one valve effects that of the other. The valves are used in props subject to sudden loads;
1437 STANDARD OIL
Mobile roof support unit; Patent. ~K PATENT N0.1,344,7~1, PUBL.DATE JAN.23,197~. A roof support is carried on cr~ler tracks and hydraulically extenis to contact the roof and floor when in position and does not put ar~ load on the tracks.
1438 CHUDEK, M PACH, A Support as a factor of pressure control during mining operations; In Polish. 18F,1T,11R. PRZEGL. GORN.V30, NI•JAN. 1974, P26-35. Equations and nomograms are given which enable the loadbearing capacity of lor~wall supports to be determined. Research carried out in Polish coal mines is described. 1439 FAIRHURST• C SINGH,B Theoretical studies of the stability of a bolted bedded mine roof. In Polish; IIF~IT,IOR. PRZEGL. GORN.V~O, NI,JAN. 1974, P56-6 2. Theoretical analysis has shown that anchors grouted with resin along their whole length are much stronger a~d form better and mare efficient supports for a bedded mine roof. The superiority c@ resin bolts as compared to wedged bolts is stated. 1440 BACKACOU, J RAFFOUX, JF ~,J InsPection of the stability of bolted roadways. In Polish; ~F• IT. PRZEGL. GORN.V30, N1,JAN. 1974, 47- 56. Typical examples of roof subsidence are given and remedial methods discussed; Special attention is paid to constant monitorimg of ~ehors. The work carried out in the Lc~raine Basin is described with details of the inspection system of bolts; The momito~ing system consists of
regular measurements and of transmittim~ the results in form of punched cards to a computer. The computer signals t h e occt~ring hazard. 14~l WHI TTAK~q•BN HLADE,MJ Resin based reinforcement of rocks around m~n~ng excavations in Great ~itain. In Polish.13F•iT, SR. PRZEGL.GORN. V30, N1,JAN. 1974, P38"47 • The consolidation of rocks is estimated on the basis of experiments in mines and research work carried out in the U.K. Particular attention is drawn to the method of fastening bolts by resin injections into long bore_holes. 1~2 THOMS, RL LOUISIANA STATE UNIV.USA CHAR, CV WALK HAYDEL ASSOC.NEW OELEANS,USA B~G)~RON•WJ MCNEESE STATE UNIV.LA.USA Finite element Analysis of rock-salt pillar models. Symposium. In New Horizons in Rock Mechanics. IIF,13R. PROC.14TH SYMPOSYOM ON ROCK MECHANICS,ASCE,NEW YORK, 1973, P393-408. The objective of the research described was to employ the finite element method to model numerically the time depemdent deformation of rock-salt pillar models. The potential practical application of the results of this research wo~id be to predict closure of rooms in salt domes or bedded salt. Such rooms can be used for storage of radioactive or toxic wastes; thus the potential practical application of the m ~ a r i z e d research is currently of great interest. Auth.
1443 PARISEAU, WC UNIV.U~AH, SALT LAKE CITY,USA EEALY, CD UNTV. IDAHO,MOSCOW,USA Support potential of hydraulic backfill. Symposium. In New Hemizons in Rock Mechanics. 7F,~SR. PROC. 14TH SYMPOSITJM ON ROCK MECHANICS•ASCE•N~4 YORK•
1973,P5Ol-526. The results of a prelimimary investigation coneernir~ the support potential of classified mill railings used as backfill in stopes developed by t h e cut-and-fill method of mining are p r e s ~ ; Red~tion in stope convergence and improved grourd control obtainable with practicable mine fills were of primary ~ a n c e . Part 1 of this paper formulates an idealized problem of cut-s/d-fill etopir~ as one in which the final stope configuration is obtained incrementslly through an alternating series of cuts ard fills in an initially stressed medium. Four stoping sequences are examired. The results of these atopir~ sequences in terms of the extent of the failed zone in the stope walls and stope wall convergence or closure are presented in Part 2. These results are disc~ssed in Part 3.
Geological factors of importance in underground excavations DENKHAUS, HG C SIRIPRETORIA, ZA Rock mass classification as a means of predicting rock wall stability. In Polish. 6Fj6T,6R. ~ . GORN.V30, N1,JAN. 1974,P10-19. The problems of rockbursts in urdergroumd mines are discussed referring to roof and wall stability. A systematic classification of rock mass is given accordlmg to mechanical parameters sffecti~ stability. The main parameters are: strength, h t m ~ t y , crmshability, swelling, density of Joir~s, orientation of Joints, weathering, erosion and liability of gas-dust outbursts; An example is given how the classification presented helped to choose ~he right support in a tunrel; ADLERj RE The influence of fabric statisf~ics on teoto~Ics in coal minimg; In German. 6F,31R.