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In situ shear wave velocity from MASW surface waves at Norwegian soft clay sites.

Long M., Donohue S.

Studia Geotechnica et Mechanica

2007

Vol. 29, nr 1-2

69-85

The Multichannel Analysis of Surface Waves (MASW) technique, used to determine shear wave velocity (Vx) and hence small strain stiffness (Gmax), has recently generated considerable interest in the geophysics community. This is because of the ease of carrying out the test and analysis of the data. The objective of this work was to assess the repeatability, accuracy and reliability of MASW surface wave measurements for use in engineering studies. Tests were carried out at 5 well-characterized Norwegian soft clay research sites where Vs had already been assessed using independent means. As well as being easy and quick to use MASW gave consistent and repeatable results. The MASW Vs profiles were similar to those obtained from other techniques. This work also confirms that MASW Vs clay profiles are comparable to those obtained by correlation with CPT. For these sites there also seems to be a good correlation between normalized small strain shear modulus and in situ void ratio or water content and the data fit well with published correlations for clays.

Review of peat strength, peat characterisation and constitutive modelling of peat with reference to landslides

Long M.

Studia Geotechnica et Mechanica

2005

Vol. 27, nr 3-4

67-90

The correct estimation of the shear strength of the peat subsoil is one of the major aspects of assessing risk of landslip in blanket peat areas. Due to the fibrous structure of the peat, its behaviour during shear is somewhat different from that of mineral soils (e.g. soft clays) and it has been found difficult to obtain reliable values of its shear strength. To estimate the shear strength of the peat, the geotechnical engineer is faced with making use of a several testing techniques, both in the laboratory and in situ, which were actually developed for mineral soils. Whether these techniques are applicable to peat is not clear. The objectives of this note are to review:1. Available methods of characterising peat. 2. Previous research that has been carried out on estimating the shear strength of peat in Ireland and elsewhere using both laboratory and in situ testing. 3. Efforts that have been made to model peat using advanced numerical modelling. Following the review some recommendations will be made as to which test type is most applicable to peat soils and recommendations will be made for further work.