Anisotropic strength and stiffness properties of some UK Coal Measure siltstones
- Resource Type
- Article
- Authors
- Whittles, D.N.; Yasar, E.; Reddish, D.J.; Lloyd, P.W.
- Source
- The Quarterly Journal of Engineering Geology and Hydrogeology; May 2002, Vol. 35 Issue: 2 p155-166, 12p
- Subject
- Language
- ISSN
- 14709236
This paper presents results from, and theory to support the anisotropic testing of a series of laminated Coal Measure siltstones. It was found that laminations within the siltstone units created an anisotropic fabric with varying strength and stiffness properties in relation to the orientation of the planes of lamination. New results are presented illustrating changes in triaxial, unconfined compressive, elastic modulus and tensile strength for ten orientations of the lamination plane. A number of anisotropic failure criteria are reviewed and then compared to the test results allowing the selection of the optimum method of characterising the siltstone strength anisotropy. The influence of lamination plane orientation on the tensile strength and Elastic Modulus was also assessed and analysed in relation to theoretical models.