Mechanical Behavior Of Rock Research Articles

Effects of temperature on the mechanical behaviour of rocks : Homand-Etienne, F; Houpert, R Rev Fr GeotechN28, 1984, P41–47

Effects of temperature on the mechanical behaviour of rocks : Homand-Etienne, F; Houpert, R Rev Fr GeotechN28, 1984, P41–47

2, 3の本邦岩石に対する間隙水圧効果

2, 3の本邦岩石に対する間隙水圧効果

Mechanical behaviour of rocks under fatigue : Brighenti, G Proc 4th Congress International Society for Rock Mechanics, Montreux, 2–8 Sept 1979, Vol 1, P65–70. Publ Rotterdam, A A Balkema, 1979

Mechanical behaviour of rocks under fatigue : Brighenti, G Proc 4th Congress International Society for Rock Mechanics, Montreux, 2–8 Sept 1979, Vol 1, P65–70. Publ Rotterdam, A A Balkema, 1979

Influence of temperature on the mechanical behaviour of rocks (in French) : Houpert, R; Homand-Etienne, F Proc 4th Congress International Society for Rock Mechanics, Montreux, 2–8 Sept 1979, Vol 1, P177–180. Publ Rotterdam, A A Balkema, 1979

Influence of temperature on the mechanical behaviour of rocks (in French) : Houpert, R; Homand-Etienne, F Proc 4th Congress International Society for Rock Mechanics, Montreux, 2–8 Sept 1979, Vol 1, P177–180. Publ Rotterdam, A A Balkema, 1979

Application of acoustic emission in the geotechnical area

A review of the application of acoustic emission (microseismic) techniques to the geotechnical area will be given. The approach will be somewhat historical starting with the pioneering work (in the 1930's) by Obert and Duvall in the coal and metal mines and continuing up to the present where currently a host of materials and engineering problems are being investigated with acoustic emission techniques. Acoustic emission measurements in the laboratory will be described which have given insight into the mechanical behavior of rocks, soils, coal and ice. Field applications which will be dealt with include determination of the stability of mine tunnels, open pit mine slopes, underground gas storage reservoirs, and earthem dikes and dams. The use of acoustic emission techniques in earthquake prediction studies will be reviewed. [The authors' work has been supported by EPA.]

Mechanical behaviour of rock under cyclic loading : 9F, 1T, 11R. Proc. 3rd Congress ISRM, Denver, 1974, vol 2 part A, P373–378

Mechanical behaviour of rock under cyclic loading : 9F, 1T, 11R. Proc. 3rd Congress ISRM, Denver, 1974, vol 2 part A, P373–378

圧縮破壊過程における岩石の力学的挙動について

圧縮破壊過程における岩石の力学的挙動について

Effects of alteration and joint fillings on the mechanical behaviour of rocks. 1. Annual report. 2. Final report : 112F. US BUR. MINES, OPEN FILE REPORT, OFR 29-1-74 AND OFR 29-2-74, MAY, 1973, 206P, AND JAN. 1974, 89P

Effects of alteration and joint fillings on the mechanical behaviour of rocks. 1. Annual report. 2. Final report : 112F. US BUR. MINES, OPEN FILE REPORT, OFR 29-1-74 AND OFR 29-2-74, MAY, 1973, 206P, AND JAN. 1974, 89P

Mechanical behaviour of rock under cyclic failure : Haimson, BC Univ. Wisconsin, Madison, USA Kim, CM Univ. Wisconsin, Madison, USA Symposium. In Stability of rock slopes. 10F, 1T, 6R. 13TH SYMPOSIUM ON ROCK MECHANICS ASCE, NEW YORK, 1972, P845–863

Mechanical behaviour of rock under cyclic failure : Haimson, BC Univ. Wisconsin, Madison, USA Kim, CM Univ. Wisconsin, Madison, USA Symposium. In Stability of rock slopes. 10F, 1T, 6R. 13TH SYMPOSIUM ON ROCK MECHANICS ASCE, NEW YORK, 1972, P845–863

Pore fluid and the mechanical behaviour of rock : Cornet, FH Univ. Minnesota, Minneapolis, USA Symposium. In Stability of rock slopes. 3F, 20R. 13TH SYMPOSIUM ON ROCK MECHANICS ASCE, NEW YORK, 1972, P825–844

Pore fluid and the mechanical behaviour of rock : Cornet, FH Univ. Minnesota, Minneapolis, USA Symposium. In Stability of rock slopes. 3F, 20R. 13TH SYMPOSIUM ON ROCK MECHANICS ASCE, NEW YORK, 1972, P825–844

結晶片岩の力学的挙動に関する一考察

The structure of rocks have an important influence upon the mechanical behavior ofrocks. An investigation was made to study the influence of schistosity planes of schistose rocks of Bessi Mine, Ehime prefecture. Uni-axial compression and radial comression tests were carried out forthis study. For the tests, cylindrical test pieces were prepared so that their axes were at angles of 0°C, 15°…, 75°, 90° with the schistosity planes. The elastic wave velocities were also measured along the axes of these core samples under uni-axial compres sion.The results obtained were as follows.1) The graph obtained by plotting the uni-axial strength against angles between their axes and the schistosity planes was represented by a parabolic curve having a minimum value at about 30°. This result agreed with the Jaeger's theory. However his mechanical interpretation of fracturewas not satisfied.2) Radial compression tests gave tensile strength of schistose rocks when samples were loaded parallel to its schistosity planes, but, when loaded perpendicular to this direction, samples were fractured along the schistosity planes. Therefor, to obtain the true tensile strength, the direct uni-axial tensile test had to be tried.3) The static behavior of schistose rocks could be illustrated by an interpretation considered based on the theory of Walsh, and assuming the presence of cracks elongating along the schistosity planes. However, to interprete the dynamic behavior of them, much more detailed investigations, especially, 1) the anisotropy of rock forming minerals, and 2) relations between the propagation-dispersion properties ofelastic wave and the shape of the cracks are required.

On Mechanical Behaviors of Rocks under Various Loading-Rates

The mechanical behaviors of rocks under various loading-rates which ranged from 1×10-2kg/cm2/sec to 12×105kg/cm2/sec, have been investigated in this paper. The higher rates of loading have been obtained by the use of a drop-hammer testing machine, while the lower rates of loading have been obtained by the use of a hydraulic testing machine.In the case of the high-speed loading test, which is undertaken for the purpose of comparing it with the low-speed loading test, the shock waves should be eliminated perfectly, so as not to expose the rock specimens to impact loading. Or the rock specimens would only be definitely exposed to an elastic pressure.From the above consideration, a new drop-hammer testing machine has been designed. It consists of an anvil, a drop-hammer and a cylindrical dynamometer. The anvil weighs about 800kg and is mounted on four dampers. The drop-hammer weighs about 40kg, having a damper in its body. On the other hand, the dynamometer is equipped with eight resistance-type wire strain gauges.From the test, the following results were obtained, using sandstone, marble, or cementmortar.(1) The compressive strength of rocks increases with the loading-rate, sandstone at the rate of about 1.6 in respect of the ratio of the high-speed compressive strength to that of low-speed, marble at the rate of about 1.9, and cementmortar at the rate of about 1.5. In these cases, the average loading-rates of the high-speed test are about 3.0∼12×105kg/cm2/sec, and the average loading-rates of the low-speed test are about 9.5∼10×10-2kg/cm2/sec. Also, the values of the secant modulus of elasticity of rock increase with the loading-rate. Poisson's number of each rock decreases with the increase of the compressive load, but Poisson's number on the same compressive stress has a tendency to increase as the loading-rate.(2) The compressive strength of rocks increases with the strain-rate; for instance, the relation between the compressive strength and the strain-rate of marble is expressed byσd=730+26logvd/v0+2.6(logvd/v0)2.12where σ0: strength in the low-speed loading test (kg/cm2)σd strength in the test of voluntary loading speed (kg/cm2)υ0: strain-rate in the low-speed loading testυd: strain-rate in the test of voluntary loading speed(3) The strength and the secant modulus of elasticity of rocks in the tension test increase with the loading-rate; for instance, the ratio of the high-speed tensile strength to the low-speed one is about 2.1, and the ratio of the modulus of elasticity in the high-speed test to that in the low-speed test is about 2.5 for marble. In these tests, the average loading-rates of the high-speed test are about 2.7×104kg/cm2/sec, and the average loading-rates of the low-speed test are about 9.9×10-3 kg/cm2/sec.

高速静荷重下における岩石の力学的性質 (第1報)

Mechanical behaviors of rocks under the dynamic loading are investigated in this paper. Here, the dynamic loading means not impact loading, but high-speed loading.In the case of dynamic loding test using a drop-hammer, the shock waves should be eliminated perfectly. Under such condition, the rock specimens are definitely subjected only to an elastic pressure. From the above consideration, a new drop-hammer testing machine was designed. It consists of an anvil, a drop-hammer and a cylindrical dynamometer. The anvil is weighed about 800kg and mounted on four dampers. The drop-hammer is weighed about 40kg, having a damper in its body. On the other hand, the dynamometer is equipped with eight resistance-type wire strain gages. From the tests the following results were obtained, using cementmortar, sandstone, or marble specimens.(1) The compressive strength of rocks increases with the loading-rate ; namely, the ratio of the dynamic compressive strength to the static one is about 1.5 for cementmortar, about 1. 6 for sandstone, and about 1.9 for marble. In these cases, the average loading-rates of the dynamic loading tests are about 3.0-12×105kg·cm-2. sec-1.(2) The values of the secant modulus of elasticity increases with the loading-rate; namely, the ratio of the dynamic modulus of elasticity to the static modulus of elasticity is about 3. 2 for cementmortar and sandstone, about 1. 6 for marble.(3) The values of the strain of rock specimens measured at failure decrease as the loading-rate increases.