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Finite layer analysis of laterally loaded piles in cross-anisotropic soils
184A 923350 Geosynthetics in landfill closures design considerations Feeney, M T Geotext Geomem VIO, N5-6, 1991, P403-410
Geusynthetics are useful for closing landfill sites, particularly where there is a limited supply of local clay soils. Stability under gravitational, erosion, and landfill gas pressure sources is discussed. The effects of construction equipment, freezing, root growth, and fauna on the integrity of the cover are considered. Anchor trench design using the umbrella concept is suggested. 923351 Elastostatic deformation of a haft-space under conical loading Hemsley, J A lnt J Nun A ~ I Moth Geomech V15, N l l , Nov 1991, P759783
The case of ground deformation induced by a freely deposited heap of granular material is examined as a fundamental problem in classical elasticity with axisymmetrical vertical conical loading of a half space. Closed form expressions are obtained for the deformed shape of the surface on the basis of Bessel function series, numerical integration, and Struve function series. Results are presented in graphical form. 923352 Finite layer analysis of laterally loaded piles in crossanisotropie soils Lee, C Y; Small, J C lmt J Nmn A u i Metk Geomech V15, N l l , Nov 1991, P785808
A computationaUy efficient and economic finite layer approach for analysing laterally loaded piles in isotropic and crossanisotropic soils is presented. The isotropic solutions compare well with those from more rigorous finite element analysis. The effect of soil anisotropy is demonstrated by presentation of some theoretical solutions. The method, which is suitable for implementation on a PC, is applied to two full scale field case histories. 923353 Pile group settimtemt: a probabilistic approach Quek, S T; Phoon, K K; Chow, Y K Im J N m Aiml Meth Geomeeh V15, N i l , Nov 1991, P817832 As an alternative to costly 3D analysis, a method using a first order perturbation technique in conjunction with the hybrid approach (Chow, 1987) is presented to determine the mean and coefficient of variation of settlement of pile groups. The spatially varying soil modulus is modelled as a homogeneous random field. Single pile solutions compare well with conventional stochastic finite element analyses. Effects of pile spacing and group size are examined. Reliability analysis is performed to determine reliability and probability of unserviceable behaviour. 923354 Pile-cap-pile-group interaction in nonhomngeneous soil Chow, Y K; Teh, C I J Geoteek Engng Die ASCE VII7, N i l , Nov 1991, P16551668 A rigorous analysis of the pile cap-pile group interaction problem with the pile cap in contact with the ground is presented for a nonhomogeneous soil profile (Young's modulus increasing linearly with depth) and an equivalent homogeneous profile. Parametric analysis is used to investigate the influence of distribution of Young's moduli on behaviour of the groups.
Individual piles carry a greater proportion of load and pile cap a lesser proportion of load for the case of the inhomogeneous profile as compared to the homogeneous profile. The presence of the cap does not significantly influence the stiffness of the group. Numerical results are in reasonable agreement with field measurements. 923355 Bearing capacity of eccentrically obliquely leaded footing Saran, S; Agarwal, K J Geoteeh EngBg Die ASCE 1/117, N i l , Nov 1991, P16691690 Limit equilibrium analysis of the bearing capacity of an eccentrically obliquely loaded footing is presented. The footing is considered rigid with a rough base, the failure surface is logspiral in shape. Failure occurs on the same side as the eccentricity with respect to the footing centre, and the resistance mobilised on this side is fully passive and partial on the other. Loss of contact is assumed to occur with increase in eccentricity. Model tests on sand are used to verify the analytical solutions. Comparisons are also made with results of previous investigations. 923356 Finite-layer analysis of axially loaded piles Lee, C Y; Small, J C J Geotech Engng Die ASCE Vl17, N i l , Nov 1991, P17061722 A finite layer analysis of axially loaded piles in isotropic or cross-anisotropic soils is presented. It is computationally very efficient. Results are compared with those of finite element, boundary element, infinite element and discrete fourier series continuum approaches to demonstrate the accuracy of the proposed method. Solutions are presented for the case of a pile bearing on a layer stiffer or softer than the rest of the soil mass. The effects of the cross-anisotropic soil model are illustrated using parametric analysis and a field case of a pile embedded in overconsolidated London Clay. 923357 Tests on model instrumented grouted piles in offshore calcareous soil Lee, C Y, Poulos, H G J Geotech Engng Die ASCE V117, N i l , Nov 1991, P17381753 Results of model tests using a calcareous sand from the North West Shelf of Australia are presented. The soil is characterised by high void ratio and tendency to crush under relatively moderate loads. Behaviour of the pile shaft during installation, under static loading tests, and under displacement- and loadcontrolled cyclic loading is described. Residual stresses on the pile shaft as a result of installation are low. The relatively high skin friction is significantly reduced during cyclic loading. Model test results are consistent with other laboratory data and some field data. 923358 Surface loading of anisotropic rock masses Liao, J J, Amadei, B J Geotech Engng Die ASCE V117, N I l , Nov 1991, P17791800
Surface loading of regularly jointed anisotropic rock masses is described. Parametric analysis is used to examine the effect on stress distribution of type of loading of the ground surface, flat or curved ground surfaces, degree of anisotropy, and orientation of joint planes relative to direction of surface loading. The
© 1992 Pergamon Press Ltd. Reproduction not permitted
Geusynthetics are useful for closing landfill sites, particularly where there is a limited supply of local clay soils. Stability under gravitational, erosion, and landfill gas pressure sources is discussed. The effects of construction equipment, freezing, root growth, and fauna on the integrity of the cover are considered. Anchor trench design using the umbrella concept is suggested. 923351 Elastostatic deformation of a haft-space under conical loading Hemsley, J A lnt J Nun A ~ I Moth Geomech V15, N l l , Nov 1991, P759783
The case of ground deformation induced by a freely deposited heap of granular material is examined as a fundamental problem in classical elasticity with axisymmetrical vertical conical loading of a half space. Closed form expressions are obtained for the deformed shape of the surface on the basis of Bessel function series, numerical integration, and Struve function series. Results are presented in graphical form. 923352 Finite layer analysis of laterally loaded piles in crossanisotropie soils Lee, C Y; Small, J C lmt J Nmn A u i Metk Geomech V15, N l l , Nov 1991, P785808
A computationaUy efficient and economic finite layer approach for analysing laterally loaded piles in isotropic and crossanisotropic soils is presented. The isotropic solutions compare well with those from more rigorous finite element analysis. The effect of soil anisotropy is demonstrated by presentation of some theoretical solutions. The method, which is suitable for implementation on a PC, is applied to two full scale field case histories. 923353 Pile group settimtemt: a probabilistic approach Quek, S T; Phoon, K K; Chow, Y K Im J N m Aiml Meth Geomeeh V15, N i l , Nov 1991, P817832 As an alternative to costly 3D analysis, a method using a first order perturbation technique in conjunction with the hybrid approach (Chow, 1987) is presented to determine the mean and coefficient of variation of settlement of pile groups. The spatially varying soil modulus is modelled as a homogeneous random field. Single pile solutions compare well with conventional stochastic finite element analyses. Effects of pile spacing and group size are examined. Reliability analysis is performed to determine reliability and probability of unserviceable behaviour. 923354 Pile-cap-pile-group interaction in nonhomngeneous soil Chow, Y K; Teh, C I J Geoteek Engng Die ASCE VII7, N i l , Nov 1991, P16551668 A rigorous analysis of the pile cap-pile group interaction problem with the pile cap in contact with the ground is presented for a nonhomogeneous soil profile (Young's modulus increasing linearly with depth) and an equivalent homogeneous profile. Parametric analysis is used to investigate the influence of distribution of Young's moduli on behaviour of the groups.
Individual piles carry a greater proportion of load and pile cap a lesser proportion of load for the case of the inhomogeneous profile as compared to the homogeneous profile. The presence of the cap does not significantly influence the stiffness of the group. Numerical results are in reasonable agreement with field measurements. 923355 Bearing capacity of eccentrically obliquely leaded footing Saran, S; Agarwal, K J Geoteeh EngBg Die ASCE 1/117, N i l , Nov 1991, P16691690 Limit equilibrium analysis of the bearing capacity of an eccentrically obliquely loaded footing is presented. The footing is considered rigid with a rough base, the failure surface is logspiral in shape. Failure occurs on the same side as the eccentricity with respect to the footing centre, and the resistance mobilised on this side is fully passive and partial on the other. Loss of contact is assumed to occur with increase in eccentricity. Model tests on sand are used to verify the analytical solutions. Comparisons are also made with results of previous investigations. 923356 Finite-layer analysis of axially loaded piles Lee, C Y; Small, J C J Geotech Engng Die ASCE Vl17, N i l , Nov 1991, P17061722 A finite layer analysis of axially loaded piles in isotropic or cross-anisotropic soils is presented. It is computationally very efficient. Results are compared with those of finite element, boundary element, infinite element and discrete fourier series continuum approaches to demonstrate the accuracy of the proposed method. Solutions are presented for the case of a pile bearing on a layer stiffer or softer than the rest of the soil mass. The effects of the cross-anisotropic soil model are illustrated using parametric analysis and a field case of a pile embedded in overconsolidated London Clay. 923357 Tests on model instrumented grouted piles in offshore calcareous soil Lee, C Y, Poulos, H G J Geotech Engng Die ASCE V117, N i l , Nov 1991, P17381753 Results of model tests using a calcareous sand from the North West Shelf of Australia are presented. The soil is characterised by high void ratio and tendency to crush under relatively moderate loads. Behaviour of the pile shaft during installation, under static loading tests, and under displacement- and loadcontrolled cyclic loading is described. Residual stresses on the pile shaft as a result of installation are low. The relatively high skin friction is significantly reduced during cyclic loading. Model test results are consistent with other laboratory data and some field data. 923358 Surface loading of anisotropic rock masses Liao, J J, Amadei, B J Geotech Engng Die ASCE V117, N I l , Nov 1991, P17791800
Surface loading of regularly jointed anisotropic rock masses is described. Parametric analysis is used to examine the effect on stress distribution of type of loading of the ground surface, flat or curved ground surfaces, degree of anisotropy, and orientation of joint planes relative to direction of surface loading. The
© 1992 Pergamon Press Ltd. Reproduction not permitted