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Inverse problem approach to settlement prediction
28A
The permeability and strength of San Andreas fault gouge from the Clenega Valley was measured trader confining press~es up to 2 Kbar. The gouge was composed almost entirely of clay minerals, predominantly montmorillonite and mixed-layer clays. Permeabilities ramged between i add i0 nanodmrcies for confining pressures of a few hurdred bars to i kbar, and less than i nanodarcy for pressures greater than i kbar. Permeability was sensitive to confining l~ess~e ani differential stress, but did not depend significantly on acctmmlated strain. 82206~ COMPARISON OF RESULTS FR~4 AIR-ACCEPTANCE AND HYDROGEfN/)GICAL TESTS ASSOCIATED WITH UNDERGROU~ COAL GASIFICATION. TECHNICAL NOTE Edwardss W C; Vogwill, R I J Can Geotech J, VI8, N3, Aug 1981, P~3-~d~7
82206 9 SOIL CONSOLIDATION BEHAVIOR AS~SSED BY SEI~4IC VELOCITY MEASUREMENTS Hamdi, F A I; Taylc~ Smith, D Geophys Prospect, V29, NS, Oct 1981, P715-729 The P wave velocities of 20 saturated marine sediments characteristic of continental shelf enviromments were measured under increasiDg corditions of simulated overburden pressure. Based on t h e results an in situ method is suggested far predicting settlement of offshore gravity structures frmm electrical resistivity and seismic velocity. 822070 CONSOLIDATION OF A SOIL STRATUM, INCLUDING SELFWEIGHT EFFECTS AND lARGE STRAINS Lee, K; Sills, G C Int J Nmn Anal Meth Gecmech, VS, N4, Oct-Dec
1881, ~05-428 Air-acceptance (injection) tests were carried out in a coal seam near Fores~burg, Alberta, Canada. The seam was an anisotropic fractured aquifer. In this paper, the pressure buildup responses of the coal seam during a IX~tlon of one air-acceptamce test are a r ~ s e d . Contour plots of the pressure distribution in the seam are used to infer flow patterns amd associated permeability anisotropies. The flow parameters a r e compared with prior h~Iro~eological test results. Pressure distributions were foumd to be similar. Results indicated significant differences between the peTmeability, I X ~ n g well height~ add viscosity for the 2 flow situations. 822066 COMPRESSION-PH~COLATION TEST FOR MINE TAILINGS BACKFILL Mitchell I R J; Smith, J D CIM Bull, VT~, ~833, Sept 1981, P85--89 A new method to determine t h e effect of confining pressure on the porosity and percolation rate for hydraulic samd backfills is described. Typical test data is presented. 822067 INTERPRETING RELATIVE PH%MFABILITY AND WETTABILITY FRC~ UNSTEADY-STATE DISPLACEMERT MEASIREME~TS Batycky~ J P; McCaffery, F G; Hodgins, P K Soc Pet Engr J, V21, N3, June 1981, P296-308 A procedure has been developed and tested for evaluatimg the capillary pressure ~ wetting properties of roc~fluid systems from unsteadystate displacement data. These propertie~ can be used to derive relative permeabilities by simulation. Examples of the technique for detexx~ning wettability are given for pore-fluids/Bereasandstone and reservoir-flulds/preserved-reservoirrock s y s t e m s .
Compressibility, swelling and consolidation 822068 COMPACTIVE P R E S ~ S S IN ~ S Lowell, C W; Witaman, G R Bull AssOC Er~Ig Geol, VI8, N3, Aug 1981,
m97-308 Samples of New Providence shale aggregate were compacf~d. Conventional oedcmeter tests were carried out on a group of as-compacted samples to investigate compressibility behaviour and the compactive l~estress induced in the samples. The effect of the compaction variables on the samples were observed: compacted dry density, moulding moisture content, initial void ratio s initial degree of saturation and nominal eompactive pressure. Statistical analysis of the test data produced a descriptive model of compactive prestress in compacted New Providence Shale.
A layer of fill deposited in a soft wet coDdition will consolidate tundsr its own weight and will cummonly undergo comparatively large strains in the process. Neither of these aspects of behaviour can be modelled by traditiomal consolidation theories. In this papers a consolidation model is developed from the theory proposed by Gibson et al. and is applied to soil consolidation durir~ and after soil deposition. The more iml~rtant aspect is the consideration of selfweight since, in many instances, the surface loading applied to soft soils is small, and the majority of the compression of the layer occurs while the effective stresses reach equilibrium with the weight of the soil. 822071 MULTI-DIMENSIONAL ELAST(~PLASTIC CONSOLIDATION ANALYSIS BY FINITE ELEMENT MEI~OD Matsul, T; Abe, N Soils Found s V21 s NI s March 1981, P79-95 A technique of multi-dimensional elastoplastic consolidation analysis usimg the finite element method is presented. A reasonable analytical model of soft clay is proposed which is applicable to the consolidation analysis of the normally Ko-consolidated clay layer. The applicability of the proposed analytical method of consolidation is t h e n demonstrated by showing such analytical results for a partially loaded ground model as timedependent bshaviours, especially stress path behaviours during consolidation. 822072 IN~I~SE PROBLEM APPROACH TO SEITLEMENT PREDICTION Asaoka, A; Matsuo, M Soils Found s V20, N4, Dec 1980, F53-66 An inverse problem approach to one-dimensiorel consolidation equations has been freshly developed. This alYi~oach provides theoretical bases for the observational settlement method in which f u t u r e settlement is estimated from initial settlement observations. The master differential equation derived is shown to be effective even for a multilayered soil system under gradual load application. Applicability of the method is demonstrafed by numerical simulations. 822073 METHOD FOR ESTIMATING THE CONSOLIDATION OF A NORWALLY CONSOLIDATED CLAY OF SOME AGE Murak~-~, Y Soils FOund, V20, N~, Dec 1980, P83-93 A mathematical model of consolidation is developed by taking account of the properties of aged clays such as preconsolidation and secondary c o ~ e s s i o n effects, and the numerical solutions are presented for particular cases. By comparison with published
The permeability and strength of San Andreas fault gouge from the Clenega Valley was measured trader confining press~es up to 2 Kbar. The gouge was composed almost entirely of clay minerals, predominantly montmorillonite and mixed-layer clays. Permeabilities ramged between i add i0 nanodmrcies for confining pressures of a few hurdred bars to i kbar, and less than i nanodarcy for pressures greater than i kbar. Permeability was sensitive to confining l~ess~e ani differential stress, but did not depend significantly on acctmmlated strain. 82206~ COMPARISON OF RESULTS FR~4 AIR-ACCEPTANCE AND HYDROGEfN/)GICAL TESTS ASSOCIATED WITH UNDERGROU~ COAL GASIFICATION. TECHNICAL NOTE Edwardss W C; Vogwill, R I J Can Geotech J, VI8, N3, Aug 1981, P~3-~d~7
82206 9 SOIL CONSOLIDATION BEHAVIOR AS~SSED BY SEI~4IC VELOCITY MEASUREMENTS Hamdi, F A I; Taylc~ Smith, D Geophys Prospect, V29, NS, Oct 1981, P715-729 The P wave velocities of 20 saturated marine sediments characteristic of continental shelf enviromments were measured under increasiDg corditions of simulated overburden pressure. Based on t h e results an in situ method is suggested far predicting settlement of offshore gravity structures frmm electrical resistivity and seismic velocity. 822070 CONSOLIDATION OF A SOIL STRATUM, INCLUDING SELFWEIGHT EFFECTS AND lARGE STRAINS Lee, K; Sills, G C Int J Nmn Anal Meth Gecmech, VS, N4, Oct-Dec
1881, ~05-428 Air-acceptance (injection) tests were carried out in a coal seam near Fores~burg, Alberta, Canada. The seam was an anisotropic fractured aquifer. In this paper, the pressure buildup responses of the coal seam during a IX~tlon of one air-acceptamce test are a r ~ s e d . Contour plots of the pressure distribution in the seam are used to infer flow patterns amd associated permeability anisotropies. The flow parameters a r e compared with prior h~Iro~eological test results. Pressure distributions were foumd to be similar. Results indicated significant differences between the peTmeability, I X ~ n g well height~ add viscosity for the 2 flow situations. 822066 COMPRESSION-PH~COLATION TEST FOR MINE TAILINGS BACKFILL Mitchell I R J; Smith, J D CIM Bull, VT~, ~833, Sept 1981, P85--89 A new method to determine t h e effect of confining pressure on the porosity and percolation rate for hydraulic samd backfills is described. Typical test data is presented. 822067 INTERPRETING RELATIVE PH%MFABILITY AND WETTABILITY FRC~ UNSTEADY-STATE DISPLACEMERT MEASIREME~TS Batycky~ J P; McCaffery, F G; Hodgins, P K Soc Pet Engr J, V21, N3, June 1981, P296-308 A procedure has been developed and tested for evaluatimg the capillary pressure ~ wetting properties of roc~fluid systems from unsteadystate displacement data. These propertie~ can be used to derive relative permeabilities by simulation. Examples of the technique for detexx~ning wettability are given for pore-fluids/Bereasandstone and reservoir-flulds/preserved-reservoirrock s y s t e m s .
Compressibility, swelling and consolidation 822068 COMPACTIVE P R E S ~ S S IN ~ S Lowell, C W; Witaman, G R Bull AssOC Er~Ig Geol, VI8, N3, Aug 1981,
m97-308 Samples of New Providence shale aggregate were compacf~d. Conventional oedcmeter tests were carried out on a group of as-compacted samples to investigate compressibility behaviour and the compactive l~estress induced in the samples. The effect of the compaction variables on the samples were observed: compacted dry density, moulding moisture content, initial void ratio s initial degree of saturation and nominal eompactive pressure. Statistical analysis of the test data produced a descriptive model of compactive prestress in compacted New Providence Shale.
A layer of fill deposited in a soft wet coDdition will consolidate tundsr its own weight and will cummonly undergo comparatively large strains in the process. Neither of these aspects of behaviour can be modelled by traditiomal consolidation theories. In this papers a consolidation model is developed from the theory proposed by Gibson et al. and is applied to soil consolidation durir~ and after soil deposition. The more iml~rtant aspect is the consideration of selfweight since, in many instances, the surface loading applied to soft soils is small, and the majority of the compression of the layer occurs while the effective stresses reach equilibrium with the weight of the soil. 822071 MULTI-DIMENSIONAL ELAST(~PLASTIC CONSOLIDATION ANALYSIS BY FINITE ELEMENT MEI~OD Matsul, T; Abe, N Soils Found s V21 s NI s March 1981, P79-95 A technique of multi-dimensional elastoplastic consolidation analysis usimg the finite element method is presented. A reasonable analytical model of soft clay is proposed which is applicable to the consolidation analysis of the normally Ko-consolidated clay layer. The applicability of the proposed analytical method of consolidation is t h e n demonstrated by showing such analytical results for a partially loaded ground model as timedependent bshaviours, especially stress path behaviours during consolidation. 822072 IN~I~SE PROBLEM APPROACH TO SEITLEMENT PREDICTION Asaoka, A; Matsuo, M Soils Found s V20, N4, Dec 1980, F53-66 An inverse problem approach to one-dimensiorel consolidation equations has been freshly developed. This alYi~oach provides theoretical bases for the observational settlement method in which f u t u r e settlement is estimated from initial settlement observations. The master differential equation derived is shown to be effective even for a multilayered soil system under gradual load application. Applicability of the method is demonstrafed by numerical simulations. 822073 METHOD FOR ESTIMATING THE CONSOLIDATION OF A NORWALLY CONSOLIDATED CLAY OF SOME AGE Murak~-~, Y Soils FOund, V20, N~, Dec 1980, P83-93 A mathematical model of consolidation is developed by taking account of the properties of aged clays such as preconsolidation and secondary c o ~ e s s i o n effects, and the numerical solutions are presented for particular cases. By comparison with published