摘要:

AbstractIn this paper models are given for analysis and description of non‐linear properties of joints, weak intercalations and interfaces in rock masses.Models for analysis consist of four parts, i.e. shear displacement model, normal deformation model, shear strength model and a relationship between unit shear stiffness and normal stress.The method of non‐linear analysis given in this paper is based on an incremental procedure.The proposed method is available for different types of shear‐displacement curves, and also adapted to the complicated process of loading‐unloading‐reloading.The results of computer simulation of anin‐situshear test obtained by this method gave a good fit to the measured data.The method of non‐linear analysis of joint elements has been used in some practical rock engineering problems, and some interesting results and conclusions have

ISSN:0363-9061    

DOI:10.1002/nag.1610050302

出版商:John Wiley&Sons, Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractEvidence for threshold gradients is reviewed. The consolidation problem, with threshold gradient, is properly formulated and solved numerically. An approximate analytical solution is also developed. The influence of a threshold gradient on the time rate of settlement is examined, and it is shown that by modifying the definition of the degree of consolidation a good approximation to the threshold gradient problem can be obtained directly from the Terzaghi solution. It is also shown that threshold gradients will have no influence on odometer testing and their effect is, therefore, to reduce the primary compression below that predicted from standard tests.

ISSN:0363-9061    

DOI:10.1002/nag.1610050303

出版商:John Wiley&Sons, Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractGround freezing technology is favoured in civil engineering, mainly in tunnelling. The time‐dependent material characteristics in the form of creep control the bearing capacity of any frozen earth support system. The finite element method in connection with an initial strain algorithm is able to include these effects. The information about stress redistribution and deformation rate is important for an economic design. Case histories of different tunnel linings in frozen soil and two other examples of realized projects show the usefulness of such a procedur

ISSN:0363-9061    

DOI:10.1002/nag.1610050304

出版商:John Wiley&Sons, Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractA general form of the yield criterion derived from a special rate‐type constitutive equation for a granular material provides an appropriate yield surface over a narrow range of material parameters. The complete yield surface is described using a single equatio

ISSN:0363-9061    

DOI:10.1002/nag.1610050305

出版商:John Wiley&Sons, Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractA five‐step procedure involving mathematical formulation, identification and determination of parameters and verification is presented for development and selection of appropriate and reliable constitutive law(s) for geologic media. Comprehensive analyses are performed toward determination of an appropriate law for a (artificial) soil. The most suitable model is obtained by critical evaluation of four different plasticity models; here verification and comparisons of predictions with observations from laboratory tests, and with those from two boundary value problems are used as the basis of the selection. The model thus selected is found to be appropriate for applications to relevant practical problem

ISSN:0363-9061    

DOI:10.1002/nag.1610050306

出版商:John Wiley&Sons, Ltd    

年代:1981

数据来源: WILEY

摘要:

AbstractExistence of more than one numerical solution to the slope stability equations derived on the basis of force and moment equilibrium requirements of statistics is indicated. These solutions satisfy the boundary conditions at both ends of a potential slide mass. In the particular case considered, the details of the calculated response for the slices for each solution set assist the designer in selecting the more reasonable solution to the problem.

ISSN:0363-9061    

DOI:10.1002/nag.1610050307

出版商:John Wiley&Sons, Ltd    

年代:1981

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610050308

出版商:John Wiley&Sons, Ltd    

年代:1981

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610050309

出版商:John Wiley&Sons, Ltd    

年代:1981

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610050301

出版商:John Wiley&Sons, Ltd    

年代:1981

数据来源: WILEY