摘要:

AbstractA hybrid boundary element formulation for the steady state analysis of piles and pile groups embedded in a soil stratum in which the modulus increases linearly with depth is presented. The piles are represented by compressible columns or flexible beams and the soil as a hysteretic, layered medium. The explicit Green's function corresponding to dynamic loads in the interior of a layered stratum, developed earlier by Kausel is used in the study.The governing differential equations for the pile domain are solved for a distributed periodic loading intensity and those for the soil domain by a system of boundary elements at the pile‐soil interface. These are then assembled into a system of algebraic equations by satisfying interface equilibrium and compatibility.The results of the analysis have been compared against those from alternative formulations, e.g. finite elements, and confirm the accuracy of the proposed formulation. Representative results for single piles and pile groups are presente

ISSN:0363-9061    

DOI:10.1002/nag.1610090602

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractThis paper examines the torsional response of a rigid pier type foundation, with a non‐uniform or hollow cross‐section which is embedded in bonded contact with a layered elastic half space. The tractions which act at the axisymmetric boundary surface between the pier and the surrounding elastic medium are represented by discretized regions of uniform traction. The compatibility of deformation at the boundary is used to determine the interface stress distribution. The torque‐rotation response for the, rigid pier foundation is obtained for different choices of the pier geometry and shear modulus mistnatch between the layer and the underlying half

ISSN:0363-9061    

DOI:10.1002/nag.1610090603

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractThis paper explains a novel ‘back‐analysis’ shceme to determine rock mass behaviour modes from an array of deformational measurements. Theinputwill be the locations of data points and the set of measured displacements, as well as description of the locations and orientations of planes of discontinuity, and the blocks they determine. Theoutput, drawn by the computer, will be the set of block displacements, rotations, and strains that determine the behavioural mode of the

ISSN:0363-9061    

DOI:10.1002/nag.1610090604

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractThe finite element method (FEM) and the boundary element method (BEM) are two well established numerical methods used for the analysis of underground openings. The advantages of both the methods are utilized by adopting FEBEM in which finite elements are coupled with boundary elements. A coupling procedure is presented in this paper. In using FEBEM, the effect of the location of interface boundary between finite element and boundary element regions, effect of Poisson's ratio and effect of stress ratio are discussed. It is shown that Poisson's ratio and stress ratio have significant effect on the accuracy of the results. Different discretization schemes are discussed to study their effect on accuracy and computation time. The use of different material properties in the FE region is presented. A comparative study is made with FEM for all the cases. It is shown that use of FEBEM is more advantageous than FEM.

ISSN:0363-9061    

DOI:10.1002/nag.1610090605

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractA theoretical model is presented to predict simultaneous transient coupled heat and moisture transfer in partly saturated soils. The formulation is in terms of volumetric moisture content, is two dimensional, includes gravitational flow and takes into account latent heat of vaporization effects. The numerical solution of the problem is accomplished by means of a finite element solution algorithm. Predictions from the numerical model are used to investigate the importance of gravitational flow, for the case of a soil stratum subjected to evaporation losses at the surface. The results achieved show good qualitative agreement with expected behaviour.

ISSN:0363-9061    

DOI:10.1002/nag.1610090606

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractRemedial measures were required for a gold tailings dam in South Africa which had undergone a minor slope failure. Information from laboratory and field measurements was used for evaluation of the present and future stability as the height of the dam increased. To aid the design process, numerical methods were used for prediction ofin situconditions. Stability analyses by computer were then used to optimize the type of remedial measure.

ISSN:0363-9061    

DOI:10.1002/nag.1610090607

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

摘要:

AbstractThe current work uses Baiocchi's transformation to obtain heuristically a formulation of the inhomogeneous dam problem. When finite element methods are applied the finite dimensional problem is a variational inequality which may be solved to obtain approximate solutions. The main advantage of the method is that it uses a fixed mesh.The finite dimensional problem is solved by means of succesive overrelaxation with projection. Although the standard convergence theory1for this method does not apply in this case, because the stiffness matrix is not symmetric, satisfactory and rapid convergence was obtained in all of our examples.Numerical results are given for some examples.

ISSN:0363-9061    

DOI:10.1002/nag.1610090608

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610090610

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610090601

出版商:John Wiley&Sons, Ltd    

年代:1985

数据来源: WILEY