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Determination of rock mass modulus of deformation from field measurements during excavation
202A
904039 Determination of rock mass modulus of deformation from field measurements during excavation Amini, A; Hill, J L Rock Mechanics as a Guide for E~icient Uti~zation of Natural Resources: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P793-800. Publ Rotterdam: A A Balkema. 1989
relatively stable, but cohesion decreased with increasing water content. Magnitude of cohesion decrement can be expressed in terms of swelling pressure. Methods to determine the internal expansive force are presented.
Rock mass deformability is a critical parameter in rock engineering. Laboratory values from core testing or field values from plate bearing or jacking tests provide only Iocalised values which are corrected using empirical equations. Results are questionable and generally non-conservative. A method to calculate deformability based on measurement of radial convergence of tunnels is described. It gives the value of deformability exactly where the tunnel needs supporting, where the rock mass interacts with the support system. Equations and calculation charts are presented and the method illustrated with examples.
Proc International Conference on Engineering Problems of Regional Soils, Beijing, 11-15 August 1988 P637-642. Publ Beijing: International Academic Publishers, 1989
904040 Field measurement techniques applied to slurried fine grained coal mine tailings Williams, D J; Morris, P H Proc 2nd International Symposium on Field Measurements in Geomechanics, Kobe, 6-9 April 1987 V2, P1037-1046. Publ Rotterdam: A A Balkema, 1988 Application of field measurement techniques to slurried fine grained coal mine tailings has highlighted the importance of determining accuracy and reliability of measured data. The relation between shear strength and moisture content is first considered. Vane shear tests and laboratory moisture content determination were carried out and linear regression applied to the data, varying the coefficients of variation. These data were used in calibration of a nuclear probe, which proved difficult. Experiments for calibration for moisture content and wet density are described. 904041 Interpretation of plate loading tests in tunnels Rotonda, T Proc 2nd International Symposium on Field Measurements in
Geomechanics, Kobe, 6-9 April 1987 I/2, P1049-1058. Publ Rotterdam: A A Balkema. 1988 The analysis of plate loading tests based on theoretical relations valid for uniform circular load on an elastic homogeneous half-space may induce errors when applied to interpretation of tunnel data. The Fourier transform method was used to determine displacement due to application of loads on walls of circular tunnels to allow more accurate interpretation of plate loading tests. Three load configurations were considered: square loading area, radial loading on circular surface and loading on the axis of a circular plate. Results show the influence of the curvature of the walls depends on the ratio between plate radius and tunnel radius. Error increases when displacement is measured near the border of the plate. Correction factors for measurements made at various depths below the plate are derived.
904042 Shear strength characteristics of compacted expansive soils Lu, Z J; Zhang, H M; Chen, J H Proc International Conference on Engineering Problems of Regional Soils, Be~iing, i1-15 August 1988 P629-632. Publ Beijing: International Academic Publishers. 1989 The strength characteristics of compacted expansive soils as a function of water content were investigated to evaluate railway embankment stability on wetting. Effective friction angle was
904043 Black cotton soils - highly expansive clays of India Mohan, D
These montmorillonitic, basalt derived soils cover large areas of India. Systematic study has examined geomechanical properties and their variation with water content. Liquid limit has been measured as a function of plasticity index and shear strength, swelling pressure as a function of volume expansion. Seasonal ground movements have been monitored. On the basis on measurement and field experience, short underreamed piles have been adopted for foundations on Black Cotton soils. Pile foundation design and construction are described. 904O44 Compression and shear characteristics of undisturbed residual soil 'Masado' Murata, H; Hyodo, M; Yasufuku, N
Proc International Conference on Engineering Problems of Regional Soils, Beijing, 11-15 August 1988 P643-648. Publ BeQing: International Academic Publishers, 1989 Undisturbed samples of Hiroshima Masado (granitic) residual soils at various degrees of weathering were collected using a ground freezing technique. Index tests were undertaken. Isotropic and anisotropic triaxial compression and shear tests were carried out on samples at natural and saturated water contents. Modified ignition loss is a good index of weathering. Particle breakage is evident during shear and is accentuated by the presence of water. Mechanical properties are dependent on degree of weathering, confining pressure, and water content. 904045 New approach for determining the shear strength of clay sand mixed soil Nishioka, T; Sonobe, Y; Yoshida, N
Proc International Conference on Engineering Problems of Regional Soils, Beijing, 11-15 August 1988 P659-664. Publ Beijing: International Academic Publishers, 1989 Triaxial tests were carried out on 10 artificially prepared soil samples with different fines content (silt and clay size particles). Based on the results, practical expressions were derived to describe the shear strengths of cohesive, intermediate and sandy soils, using the effective stress concept. Parameters used to describe the shear strength can be closely correlated to fines content. Boundary values for fines content denoting cohesive, intermediate and sandy soils were seen. 904046 Shear characteristics of decomposed granite soil under low pressure and the stability analysis of surface failure Onitsuka, K; Yoshitake, S; Bergado, D T Proc International Conference on Engineering Problems of Regional Soils, Beijing, 11-15 August 1988 P674-679. Publ Beijing: International Academic Publishers, 1989 A new, reduced friction shear box was used to investigate shear characteristics of a decomposed granite soil. Relations between shear stress and displacement, and shear strength and normal stress and saturation were examined. The influence of particle crushing during shear on shear strength was studied. Results are discussed in relation to slope stability.
1990 Pergamon Press pie. Reproduction not permitted
904039 Determination of rock mass modulus of deformation from field measurements during excavation Amini, A; Hill, J L Rock Mechanics as a Guide for E~icient Uti~zation of Natural Resources: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P793-800. Publ Rotterdam: A A Balkema. 1989
relatively stable, but cohesion decreased with increasing water content. Magnitude of cohesion decrement can be expressed in terms of swelling pressure. Methods to determine the internal expansive force are presented.
Rock mass deformability is a critical parameter in rock engineering. Laboratory values from core testing or field values from plate bearing or jacking tests provide only Iocalised values which are corrected using empirical equations. Results are questionable and generally non-conservative. A method to calculate deformability based on measurement of radial convergence of tunnels is described. It gives the value of deformability exactly where the tunnel needs supporting, where the rock mass interacts with the support system. Equations and calculation charts are presented and the method illustrated with examples.
Proc International Conference on Engineering Problems of Regional Soils, Beijing, 11-15 August 1988 P637-642. Publ Beijing: International Academic Publishers, 1989
904040 Field measurement techniques applied to slurried fine grained coal mine tailings Williams, D J; Morris, P H Proc 2nd International Symposium on Field Measurements in Geomechanics, Kobe, 6-9 April 1987 V2, P1037-1046. Publ Rotterdam: A A Balkema, 1988 Application of field measurement techniques to slurried fine grained coal mine tailings has highlighted the importance of determining accuracy and reliability of measured data. The relation between shear strength and moisture content is first considered. Vane shear tests and laboratory moisture content determination were carried out and linear regression applied to the data, varying the coefficients of variation. These data were used in calibration of a nuclear probe, which proved difficult. Experiments for calibration for moisture content and wet density are described. 904041 Interpretation of plate loading tests in tunnels Rotonda, T Proc 2nd International Symposium on Field Measurements in
Geomechanics, Kobe, 6-9 April 1987 I/2, P1049-1058. Publ Rotterdam: A A Balkema. 1988 The analysis of plate loading tests based on theoretical relations valid for uniform circular load on an elastic homogeneous half-space may induce errors when applied to interpretation of tunnel data. The Fourier transform method was used to determine displacement due to application of loads on walls of circular tunnels to allow more accurate interpretation of plate loading tests. Three load configurations were considered: square loading area, radial loading on circular surface and loading on the axis of a circular plate. Results show the influence of the curvature of the walls depends on the ratio between plate radius and tunnel radius. Error increases when displacement is measured near the border of the plate. Correction factors for measurements made at various depths below the plate are derived.
904042 Shear strength characteristics of compacted expansive soils Lu, Z J; Zhang, H M; Chen, J H Proc International Conference on Engineering Problems of Regional Soils, Be~iing, i1-15 August 1988 P629-632. Publ Beijing: International Academic Publishers. 1989 The strength characteristics of compacted expansive soils as a function of water content were investigated to evaluate railway embankment stability on wetting. Effective friction angle was
904043 Black cotton soils - highly expansive clays of India Mohan, D
These montmorillonitic, basalt derived soils cover large areas of India. Systematic study has examined geomechanical properties and their variation with water content. Liquid limit has been measured as a function of plasticity index and shear strength, swelling pressure as a function of volume expansion. Seasonal ground movements have been monitored. On the basis on measurement and field experience, short underreamed piles have been adopted for foundations on Black Cotton soils. Pile foundation design and construction are described. 904O44 Compression and shear characteristics of undisturbed residual soil 'Masado' Murata, H; Hyodo, M; Yasufuku, N
Proc International Conference on Engineering Problems of Regional Soils, Beijing, 11-15 August 1988 P643-648. Publ BeQing: International Academic Publishers, 1989 Undisturbed samples of Hiroshima Masado (granitic) residual soils at various degrees of weathering were collected using a ground freezing technique. Index tests were undertaken. Isotropic and anisotropic triaxial compression and shear tests were carried out on samples at natural and saturated water contents. Modified ignition loss is a good index of weathering. Particle breakage is evident during shear and is accentuated by the presence of water. Mechanical properties are dependent on degree of weathering, confining pressure, and water content. 904045 New approach for determining the shear strength of clay sand mixed soil Nishioka, T; Sonobe, Y; Yoshida, N
Proc International Conference on Engineering Problems of Regional Soils, Beijing, 11-15 August 1988 P659-664. Publ Beijing: International Academic Publishers, 1989 Triaxial tests were carried out on 10 artificially prepared soil samples with different fines content (silt and clay size particles). Based on the results, practical expressions were derived to describe the shear strengths of cohesive, intermediate and sandy soils, using the effective stress concept. Parameters used to describe the shear strength can be closely correlated to fines content. Boundary values for fines content denoting cohesive, intermediate and sandy soils were seen. 904046 Shear characteristics of decomposed granite soil under low pressure and the stability analysis of surface failure Onitsuka, K; Yoshitake, S; Bergado, D T Proc International Conference on Engineering Problems of Regional Soils, Beijing, 11-15 August 1988 P674-679. Publ Beijing: International Academic Publishers, 1989 A new, reduced friction shear box was used to investigate shear characteristics of a decomposed granite soil. Relations between shear stress and displacement, and shear strength and normal stress and saturation were examined. The influence of particle crushing during shear on shear strength was studied. Results are discussed in relation to slope stability.
1990 Pergamon Press pie. Reproduction not permitted