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Guidelines for practice in California-engng. geologists versus civil engrs. Proc. 11th Ann. symposium engng. geol. and soils engng. Idaho, 1973
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1334 PEAK, WW CALIF. STATE BOARD.REGIST .GEOL.USA Guidelines for practice in California-Engng. geologists versus civil emgrs. Proc. llth Ann.Symposium Engr~.Geol. amd Soils Em@ng. Idsho, 1973. IDAHO DEI~. HIGHWAYS, NOV. 1973, P173-17~. A Joint committee of the California State Board of Registration for Geologists and the California State Board of Registration for Professional Emgineers was fc~med in 1971 for the express l~rpose of stt~lylng ar~ reporting on the areas of overlap in the fields of E~gineeri~ Geology and Civil E~ineeriDg. The resulting Committee repsrt, approved by both boards in 1972, suggests guidelines for in-hOl~Se use which divide responsibilities for specific work tasks between the two professions, with a third area in which either can practice dependir~ upon indivldtlal expertise. Co,non efforts, in which both disciplines generally psrticipate, with individual responsibilities, are also described in the report. 1335 BARTON, SM IDAHO STATE BOARD ENGNG.EXAM.USA Idaho guidelines for practice. Professional engrs. versus professional geologists. Proc. llth Ann. Symposium Engng.Geol. and Soils Emgm~. Idaho,1973. IDAHO DEPT. HIGHWAYS, NOV. 1973, P179-183. This paper reviews the history of professional engineering registration and professional geologist registration in Idaho. It notes that although guidelines have not been established there are definite legal restrictions which limit the practice of geologists into the engineering field arzl likewise limit the practice of the geological field. It emphasizes the growimg recognition that professional geologists must be called upon to help solve design problems wherein the earth's surface is disturbed and urges mutual co-operation and unlerstanding between the two professions. Aut2~.
Properties of rocks and soils See also abstracts: 1399,1457,1515,1538. 1336 HOEKSTRA, P DELANEY, A ATKINS, R Measuriug the thermal properties of cylindrical specimens by the use of slr~soidal temperature waves. Report. 9R. US ARMY CRREL, TR 2h4,AD-770 425,0CT.1973,16P. An apparatus for measuring the thermal diffuslvity of cylindrical specimens of soil and rock was constructed and tested. The results of tests on standard samples agreed with values obtained by other investigations using different methods. Because the direction of the temperature gradient is constantly reversed the method has advantages for specimens where water migration is a problem. It also has a use for materials for which the thermal properties are temperature dependent such as, for example, frozen ground in the temperature ramge Oto-lO deg.C. 1337 KOMAR, CA FROHNEsKH Analysis of factars influencing fracture initiation and orientation in oil reservoir sandstone. IIF. US BUR.MINES, RI 7813,1973, 22P.
Laboratory scale hydraulic fracture tests w~re comducted on dlrectiomally orientated tests w conlialong with measurements of directional ro~ j,roperties such as tensile stremgth, permeabilityj ult~ asonic velocity, amd dynamic elastic constants. Fracture orientation was determined as a function of various combinations of stress, rock saturation, rate of borehole presst~ization, arzl direction of minimum tensile strength relative to minimum horizontal compressive stress. The study shows that the expected influence of horizontal earth stress on the orientation of an imduced hydraulic fracture becomes negligible whenever the mmgnit~de of the difference between the compressive stresses is 200 psi or less. When this occurs, fracture orientation is controlled by the directional properties of the rock, primarily permeability and tensile stremgth. 1338 DAVIS,HE Truth in testing. Part 2. Proc. llth Ann.Symposium Engng.Geol. arzl Soils Engng. Idsho,1973. 2F. IDAHO DEPT. HIGHWAYS, NOV. 1973, P99-104 • This paper deals with the Standard Penetration Test. Seven shortcomings in the test ere tabulated ard defined. An attempt is made to appraise and evaluate the effect of the shortcomings both on an individual and cumulative basis. The Star~srd Penetration Test is considered to measure and define one variable-the blow count("N" value). Msx~ efforts have been made to relate "N" value to the In-place density of cohesionless amd other materials. This paper may help to explain not only the lack of good correlation between "N" value and density but also the apparent "~' value discrepancies as obtained by two different drillers. The paper concludes with some recc~nendations to improve the equipment and procedure. 1339 MITCHELL, JK UNIV. CALIF. ~ Ey, USA Nature and behavlo1~ of itmar soil. Froc. llth Ann. Symposium Engng.Geol. and Soils Engng. Idaho, 1973. 2F, 3R. IDAHO DEPT. HIGHWAYS, NOV •1973, PI25-130 • Three recent publications emanating from work on samples from and data obtained during the six lunsr landings stm~nsrize much of the relevant information on the nature of lunar soil, its mechanical properties, and the variability of soil conditions on the lunar surface. Abstracts of these papers form the basis of the authors presentation at this Symposium. Preliminary examination of data from the Apollo 17 mission suggests that soil conditions and behavlour at the Taurus-Littrow landing site ere si1~ilar to those at earlier sites. 1340 WHTfE,M2 Optimizing strain gauge orientation for load measurement by means of rosette analysis. 3F. STRAIN, Vg, N4, OCT. 1973,P161-162. A method of defining the orientation of the strain gauge in order to respond to the required load component, with minimum cross-coupling, as the principal strain direction changes is described. 1341 THILL, RE PENG, SS Statistical comparison of the pulse and resonance methods of determining elastic, moduli.9F. US BUR.MINES,RI 7831.1974,24P. Elastic wave velocities and moduli were determined by both the pulse and resonance methods in a large number of specimens of St. Cloud Gray Granodiorite and Tennessee marble tunder the same moisture, temperature, and stress enviror,ment. Statistical comparisons between the Young's ,shear, ard bulk moduli and Poisson's ratios obtained independently by the pulse ard resonance methods indicate that the methods do not
1334 PEAK, WW CALIF. STATE BOARD.REGIST .GEOL.USA Guidelines for practice in California-Engng. geologists versus civil emgrs. Proc. llth Ann.Symposium Engr~.Geol. amd Soils Em@ng. Idsho, 1973. IDAHO DEI~. HIGHWAYS, NOV. 1973, P173-17~. A Joint committee of the California State Board of Registration for Geologists and the California State Board of Registration for Professional Emgineers was fc~med in 1971 for the express l~rpose of stt~lylng ar~ reporting on the areas of overlap in the fields of E~gineeri~ Geology and Civil E~ineeriDg. The resulting Committee repsrt, approved by both boards in 1972, suggests guidelines for in-hOl~Se use which divide responsibilities for specific work tasks between the two professions, with a third area in which either can practice dependir~ upon indivldtlal expertise. Co,non efforts, in which both disciplines generally psrticipate, with individual responsibilities, are also described in the report. 1335 BARTON, SM IDAHO STATE BOARD ENGNG.EXAM.USA Idaho guidelines for practice. Professional engrs. versus professional geologists. Proc. llth Ann. Symposium Engng.Geol. and Soils Emgm~. Idaho,1973. IDAHO DEPT. HIGHWAYS, NOV. 1973, P179-183. This paper reviews the history of professional engineering registration and professional geologist registration in Idaho. It notes that although guidelines have not been established there are definite legal restrictions which limit the practice of geologists into the engineering field arzl likewise limit the practice of the geological field. It emphasizes the growimg recognition that professional geologists must be called upon to help solve design problems wherein the earth's surface is disturbed and urges mutual co-operation and unlerstanding between the two professions. Aut2~.
Properties of rocks and soils See also abstracts: 1399,1457,1515,1538. 1336 HOEKSTRA, P DELANEY, A ATKINS, R Measuriug the thermal properties of cylindrical specimens by the use of slr~soidal temperature waves. Report. 9R. US ARMY CRREL, TR 2h4,AD-770 425,0CT.1973,16P. An apparatus for measuring the thermal diffuslvity of cylindrical specimens of soil and rock was constructed and tested. The results of tests on standard samples agreed with values obtained by other investigations using different methods. Because the direction of the temperature gradient is constantly reversed the method has advantages for specimens where water migration is a problem. It also has a use for materials for which the thermal properties are temperature dependent such as, for example, frozen ground in the temperature ramge Oto-lO deg.C. 1337 KOMAR, CA FROHNEsKH Analysis of factars influencing fracture initiation and orientation in oil reservoir sandstone. IIF. US BUR.MINES, RI 7813,1973, 22P.
Laboratory scale hydraulic fracture tests w~re comducted on dlrectiomally orientated tests w conlialong with measurements of directional ro~ j,roperties such as tensile stremgth, permeabilityj ult~ asonic velocity, amd dynamic elastic constants. Fracture orientation was determined as a function of various combinations of stress, rock saturation, rate of borehole presst~ization, arzl direction of minimum tensile strength relative to minimum horizontal compressive stress. The study shows that the expected influence of horizontal earth stress on the orientation of an imduced hydraulic fracture becomes negligible whenever the mmgnit~de of the difference between the compressive stresses is 200 psi or less. When this occurs, fracture orientation is controlled by the directional properties of the rock, primarily permeability and tensile stremgth. 1338 DAVIS,HE Truth in testing. Part 2. Proc. llth Ann.Symposium Engng.Geol. arzl Soils Engng. Idsho,1973. 2F. IDAHO DEPT. HIGHWAYS, NOV. 1973, P99-104 • This paper deals with the Standard Penetration Test. Seven shortcomings in the test ere tabulated ard defined. An attempt is made to appraise and evaluate the effect of the shortcomings both on an individual and cumulative basis. The Star~srd Penetration Test is considered to measure and define one variable-the blow count("N" value). Msx~ efforts have been made to relate "N" value to the In-place density of cohesionless amd other materials. This paper may help to explain not only the lack of good correlation between "N" value and density but also the apparent "~' value discrepancies as obtained by two different drillers. The paper concludes with some recc~nendations to improve the equipment and procedure. 1339 MITCHELL, JK UNIV. CALIF. ~ Ey, USA Nature and behavlo1~ of itmar soil. Froc. llth Ann. Symposium Engng.Geol. and Soils Engng. Idaho, 1973. 2F, 3R. IDAHO DEPT. HIGHWAYS, NOV •1973, PI25-130 • Three recent publications emanating from work on samples from and data obtained during the six lunsr landings stm~nsrize much of the relevant information on the nature of lunar soil, its mechanical properties, and the variability of soil conditions on the lunar surface. Abstracts of these papers form the basis of the authors presentation at this Symposium. Preliminary examination of data from the Apollo 17 mission suggests that soil conditions and behavlour at the Taurus-Littrow landing site ere si1~ilar to those at earlier sites. 1340 WHTfE,M2 Optimizing strain gauge orientation for load measurement by means of rosette analysis. 3F. STRAIN, Vg, N4, OCT. 1973,P161-162. A method of defining the orientation of the strain gauge in order to respond to the required load component, with minimum cross-coupling, as the principal strain direction changes is described. 1341 THILL, RE PENG, SS Statistical comparison of the pulse and resonance methods of determining elastic, moduli.9F. US BUR.MINES,RI 7831.1974,24P. Elastic wave velocities and moduli were determined by both the pulse and resonance methods in a large number of specimens of St. Cloud Gray Granodiorite and Tennessee marble tunder the same moisture, temperature, and stress enviror,ment. Statistical comparisons between the Young's ,shear, ard bulk moduli and Poisson's ratios obtained independently by the pulse ard resonance methods indicate that the methods do not