characterization of the Bothkennaar clay: an overview

Hight, D. W.; Bond, A. J.; Legge, J D

doi:10.1680/geot.1992.42.2.303

Cited by 135 publications

(46 citation statements)

References 12 publications

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“…14. As there are several approaches to estimating s, from the SBP, the original site data were accessed and fitted with computer-aided modelling to check the reported strengths using full expansion-contraction analysis; similar values of s, to those reported by Hight et al (1992) were found. As can be seen, the SBP strengths, uncorrected for any L/D bias, lie inside the uncertainty of the triaxial data, although with a slightly different trend against depth.…”

Section: II -Cho 2 + M ~ = 3 (1 + Ln[i(l -A"+')]} (4) %mentioning

confidence: 74%

“…In conclusion, there must be a systematic bias kennar from seismic shear wave measurements in s, derived from the SBP using cylindrical (Hight et al, 1992). This modulus profile comcavity theory because of finite pressuremeter bines with the uncorrected SBP s, profile to give length, and the authors' suggestion of a rigidityrigidities of about I, = 650.…”

Section: II -Cho 2 + M ~ = 3 (1 + Ln[i(l -A"+')]} (4) %mentioning

confidence: 84%

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Discussion: The effects of pressuremeter geometry on the results of tests in clay

Houlsby¹,

Carter²

1995

Géotechnique

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Section: II -Cho 2 + M ~ = 3 (1 + Ln[i(l -A"+')]} (4) %mentioning

confidence: 74%

Section: II -Cho 2 + M ~ = 3 (1 + Ln[i(l -A"+')]} (4) %mentioning

confidence: 84%

Discussion: The effects of pressuremeter geometry on the results of tests in clay

Houlsby¹,

Carter²

1995

Géotechnique

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“…It has been widely reported that for geomaterials there is an Sshape relationship between the shear modulus G and the shear strain ª (Hight et al, 1992;Iwasaki et al, 1978). The experimental data on the variation of shear modulus with shear strain from Iwasaki et al (1978) are shown in Figure 5 by points.…”

Section: Shear Moduli Of Geomaterialsmentioning

confidence: 97%

A mathematical function to represent S-shaped relationships for geotechnical applications

Liu

Xu²,

Horpibulsuk

2013

Proceedings of the Institution of Civil Engineers - Geotechnica

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In this paper a new mathematical function is proposed for describing the S-shape relationship in both normal x and y scale and the semi-logarithmic x and y scale. Basic features of the proposed function have been demonstrated. The proposed function has then been used to simulate the S-shape relationship for seven categories of engineering phenomena. It is seen that the proposed mathematical function has a great potential for representing various S-shape relationships and provides a powerful tool for characterising properties of materials or response of systems; it is thus useful for further numerical analysis. In this paper a new mathematical function is proposed for describing the S-shape relationship in both normal x and y scale and the semi-logarithmic x and y scale. Basic features of the proposed function have been demonstrated. The proposed function has then been used to simulate the S-shape relationship for seven categories of engineering phenomena. It is seen that the proposed mathematical function has a great potential for representing various Sshape relationships and provides a powerful tool for characterising properties of materials or response of systems; it is thus useful for further numerical analysis.the Institution of Civil Engineers Geotechnical Engineering 166 June 2013 Issue GE3 Pages 321-327 http://dx.doi.org/10.1680/geng.10.00029 Paper 1000029 Received 11/03/2010 Accepted 02/02

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“…Hight et al 9 identified three principal units at Bothkennar, namely the bedded, mottled and laminated facies.…”

Section: Work At the Uk's Science And Engineering Research Council (Nmentioning

confidence: 99%

“…Hight et al 9 and Paul et al 11 summarise the depositional environment as being in relatively sheltered and, therefore, quiet, saline or brackish water, between 7 m and 20 m deep. A local more energetic environment, perhaps associated with a subtidal channel in water depths of a few metres, would have been associated with the laminated facies.…”

Section: Work At the Uk's Science And Engineering Research Council (Nmentioning

confidence: 99%

Sampling disturbance effects in soft laminated clays

Long

2003

Proceedings of the Institution of Civil Engineers - Geotechnica

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SynopsisSample disturbance effects in the laminated facies at the Bothkennar soft clay research site are examined by comparing the results of laboratory tests on specimens obtained from three fixed piston tube samplers. A significant feature of the results is that the sampling process associated with the conventional piston tube used in the UK and Ireland appears to increase the post yield stiffness and the CAUC triaxial undrained strength, reduce the preconsolidation stress, the pore pressure coefficient at failure and induce a strong tendency for dilatant behaviour post peak when compared to tests on specimens from a sampler with a modified (sharper) cutting edge angle. It is reasoned that these findings are caused by material destructuration during the sampling process with the conventional tubes. Increased densification of these specimens caused both by sampling and during anisotropic consolidation may also contribute to these effects. The results are supported by reference to recent analytical work and data for three other soils. It is recommended that the use of these conventional thin walled tubes with a crude cutting edge is abandoned and that some with improved cutting edge geometry replaces them. 3 IntroductionThe need to assess the degree of sample disturbance prior to interpretation of parameters derived from laboratory tests on soils is now well accepted. There are many studies reported in the literature on sample disturbance effects on soft to firm homogeneous compressible clays. Some examples are the classic papers of Lacasse et al. 1 and Lunne et al. 2 on Norwegian clays and Tanaka et al. 3 on Japanese clays. Hight et al. 4 described a similar study on the Bothkennar clay from the UK. Their focus was on the relatively uniform bedded and mottled facies at this site. There are very few examples of similar studies on sample disturbance effects on soft laminated clays.In some recent theoretical work, Clayton et al. 5 and Clayton and Siddique 6 studied some different sampler geometries, which were meant to represent, amongst others, the standard open drive "U100" tubes and the ELE 100 mm fixed piston sampler which are both commonly used in the UK. The results of this work suggested that, if the ELE tube cutting edge angle was reduced from the standard 30 to 5, axial compressive strains due to the sampling process would be much reduced and tensile strains would be eliminated completely. and a site at Port Said in Egypt. In the case of the Bothkennar clay, the modified tube performed as well as the high quality Sherbrooke block sampler. For the Port Said site, significantly higher quality samples were also obtained from the modified ELE sampler and it was possible to justify more optimistic design parameters which ultimately led to cost savings in the project. 4Non-homogeneous "mixed" deposits are frequently encountered in the UK, Ireland and elsewhere. The main objective of this work is to extend the experience mentioned above for relatively uniform soils to the Bothkennar laminated facies. This is a...

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characterization of the Bothkennaar clay: an overview

Cited by 135 publications

References 12 publications

Discussion: The effects of pressuremeter geometry on the results of tests in clay

Discussion: The effects of pressuremeter geometry on the results of tests in clay

A mathematical function to represent S-shaped relationships for geotechnical applications

Sampling disturbance effects in soft laminated clays

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