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Gypsum and anhydrite in foundations of hydraulic structures
16A
Hydraulic structures 791135 GYPSUM AND ANHYDRITE IN FOUNDATIONS OF HYDRAULIC SI~UCTURES James, A N; Lupton, A R R Geotechnique, V28, N3, 1978, P249-272
Comminution of Rocks 791138 RING DRILLING Svens son, H Int Water Power Dam Constr, V30, NS, Aug 1978,
P38-41
The processes by which gypsum anl anhydrlte are dissolved in the fourdations of hydraulic structures are examined quantitatively. Predictive methods developed on the basis of laboratory measurements ere put forward. Gypsum is generally the less dangerous material because it dissolves in a steady manner forming caverns or causingprogressive settlements. Anh~Irite must be treated with great caution. Guidelines are given for site investigations where these materials are encountered.
A ring drilling technique and equipment are described for enlarging pilot shafts. Radial drilling can be carried out to the required shaft diameter, regardless of amy deviation of the pilot hole. If there is a high demm.nd on the wall contour enlarging is carried out in two steps, firstly ring drilling to leave a bench, which is taken out in a second step with vertical drill holes. Examples are given of suitable drilling and blasting schemes.
Influence of dynamic loads due to explosions or earthquakes 791136 INFLUENCE OF EMBEDMENT OF A REACTOR BUILDING ON THE SEISMIC B~4AVIOUR Altes, J; Koschmeider, D In: Rock Dynamics and Geophysical Aspects (Papers to Conference on Dynamic Methods in Soil and Rock Mechanics, Karlsruhe, 5-16 Sept 1977), P227-236. Publ Rotterdam: A A Balkema, 1978 Reports a study carried out in Germany to calculate the response behaviour of an embedded reactor building, constructed by the cut-ardcover technique, and to compare it with that calculated for buildings erected above ground. A finite element program for the seismic analysis of plane 2-dimensional structures (the LUSH program) was used. The models were excited at the soil - rock interface and the calculations based on the acceleration-tlme history of the San Francisco earthquake at Golden Gate Park (March, 1957). Results indicate that there is no great difference in the calculated response of the 2 types. 791137 SOME FACTORS AFFECTING THE RESPONSE TO SEISMIC LOADING IN SOIL-STRUCTURE INTERACTION PROBLEMS Prater, E G; Wieland, M In: Rock Dynamics and Geophysical Aspects (Papers to Conference on Dynamic Methods in Soll and Rock Mechanics, Karlsruhe, 5-16 Sept 1977), P237-254. Publ Rotterdam: A A Balkema, 1978 The interaction of a massive structure with the ground is investigated by solving the equations of wave propagation directly using an explicit finite difference numerical method, which is sufficient for nonlinear system and transient type-loadiDg with a frequency content slmilsr to that encountered in earthquakes. Three factors are given special consideration: (i) the nonlinear stress-strain behaviour of the soil, (2) energy-absorbing side bounlaries, (3) spatial variations of the input motions on the lower boundary. The paper relates to earthquake engineering design with particular reference to the design of nuclear power plants to withstand seimnlc loading.
Drilling 791139 .~FF~--'T OF STRESS ON WATER JET I ~ I % M A N C E Stumners, D A; Weakley, L A Prom 19th US Symposi%~n on Rock Mechanics, Stateline, Nevada, 1-3 May 1978, Vl, P180186. Publ Reno: University of Nevada, 1978 Contrasts lab M w n , l ~ o n t e ~ s llith data obtsined from a test site i000 ft below the surCace in a ~tressed barrier pillar. Water Jet performance in this rook umder stress is also compared with that achieved when the rock is destressed.
Blasting See also: 791150 791140 CONgROL BLASTING FOR SLOPE STABILITY AT THE ADAMS MINE Morash, B J CIM Bull, W l , N793, May 1978, P121-123 The overall slope angle of 55-60 deg necessitates control blasting on the final pit walls at this iron ere mine. The techniques used, namely pre-shearing and buffer blasting, are described. The increase in operating costs is Justified by savings from increased slope angle and reduced stripping.
791141
u s e OF EXFLOSn'ES IN ~
LOPaAINE n~ON O ~
Mi~s (IN ~ ) Sinou, P Industrie Minerale, V60, NI, Jan 1978 , P17-23 Reviews the develolmnent of liquid oxygen shot blasting, cartc[d4~e ~ d nitrate explosives, and discusses the use of systematic, ahotf;ring and motorised units. 791142 USE OF EXPLOSIVES IN COAL MINES (IN FRENCH) Bigourd, J Industrle Minerale, V60, NI, Jan 1978, P25-27 A brief discussion of the types of explosives used in France, regulations applied to shotfiring, a~i ass~mlated problems (drilling patterns, roof control ).
Hydraulic structures 791135 GYPSUM AND ANHYDRITE IN FOUNDATIONS OF HYDRAULIC SI~UCTURES James, A N; Lupton, A R R Geotechnique, V28, N3, 1978, P249-272
Comminution of Rocks 791138 RING DRILLING Svens son, H Int Water Power Dam Constr, V30, NS, Aug 1978,
P38-41
The processes by which gypsum anl anhydrlte are dissolved in the fourdations of hydraulic structures are examined quantitatively. Predictive methods developed on the basis of laboratory measurements ere put forward. Gypsum is generally the less dangerous material because it dissolves in a steady manner forming caverns or causingprogressive settlements. Anh~Irite must be treated with great caution. Guidelines are given for site investigations where these materials are encountered.
A ring drilling technique and equipment are described for enlarging pilot shafts. Radial drilling can be carried out to the required shaft diameter, regardless of amy deviation of the pilot hole. If there is a high demm.nd on the wall contour enlarging is carried out in two steps, firstly ring drilling to leave a bench, which is taken out in a second step with vertical drill holes. Examples are given of suitable drilling and blasting schemes.
Influence of dynamic loads due to explosions or earthquakes 791136 INFLUENCE OF EMBEDMENT OF A REACTOR BUILDING ON THE SEISMIC B~4AVIOUR Altes, J; Koschmeider, D In: Rock Dynamics and Geophysical Aspects (Papers to Conference on Dynamic Methods in Soil and Rock Mechanics, Karlsruhe, 5-16 Sept 1977), P227-236. Publ Rotterdam: A A Balkema, 1978 Reports a study carried out in Germany to calculate the response behaviour of an embedded reactor building, constructed by the cut-ardcover technique, and to compare it with that calculated for buildings erected above ground. A finite element program for the seismic analysis of plane 2-dimensional structures (the LUSH program) was used. The models were excited at the soil - rock interface and the calculations based on the acceleration-tlme history of the San Francisco earthquake at Golden Gate Park (March, 1957). Results indicate that there is no great difference in the calculated response of the 2 types. 791137 SOME FACTORS AFFECTING THE RESPONSE TO SEISMIC LOADING IN SOIL-STRUCTURE INTERACTION PROBLEMS Prater, E G; Wieland, M In: Rock Dynamics and Geophysical Aspects (Papers to Conference on Dynamic Methods in Soll and Rock Mechanics, Karlsruhe, 5-16 Sept 1977), P237-254. Publ Rotterdam: A A Balkema, 1978 The interaction of a massive structure with the ground is investigated by solving the equations of wave propagation directly using an explicit finite difference numerical method, which is sufficient for nonlinear system and transient type-loadiDg with a frequency content slmilsr to that encountered in earthquakes. Three factors are given special consideration: (i) the nonlinear stress-strain behaviour of the soil, (2) energy-absorbing side bounlaries, (3) spatial variations of the input motions on the lower boundary. The paper relates to earthquake engineering design with particular reference to the design of nuclear power plants to withstand seimnlc loading.
Drilling 791139 .~FF~--'T OF STRESS ON WATER JET I ~ I % M A N C E Stumners, D A; Weakley, L A Prom 19th US Symposi%~n on Rock Mechanics, Stateline, Nevada, 1-3 May 1978, Vl, P180186. Publ Reno: University of Nevada, 1978 Contrasts lab M w n , l ~ o n t e ~ s llith data obtsined from a test site i000 ft below the surCace in a ~tressed barrier pillar. Water Jet performance in this rook umder stress is also compared with that achieved when the rock is destressed.
Blasting See also: 791150 791140 CONgROL BLASTING FOR SLOPE STABILITY AT THE ADAMS MINE Morash, B J CIM Bull, W l , N793, May 1978, P121-123 The overall slope angle of 55-60 deg necessitates control blasting on the final pit walls at this iron ere mine. The techniques used, namely pre-shearing and buffer blasting, are described. The increase in operating costs is Justified by savings from increased slope angle and reduced stripping.
791141
u s e OF EXFLOSn'ES IN ~
LOPaAINE n~ON O ~
Mi~s (IN ~ ) Sinou, P Industrie Minerale, V60, NI, Jan 1978 , P17-23 Reviews the develolmnent of liquid oxygen shot blasting, cartc[d4~e ~ d nitrate explosives, and discusses the use of systematic, ahotf;ring and motorised units. 791142 USE OF EXPLOSIVES IN COAL MINES (IN FRENCH) Bigourd, J Industrle Minerale, V60, NI, Jan 1978, P25-27 A brief discussion of the types of explosives used in France, regulations applied to shotfiring, a~i ass~mlated problems (drilling patterns, roof control ).