The Lance Insertion Retardation meter (LIRmeter): an instrument for in situ determination of sea floor properties—technical description and performance evaluation

Stephan, Sebastian; Kaul, Norbert E; Villinger, Heinrich

doi:10.1007/s11001-012-9156-2

Cited by 11 publications

(8 citation statements)

References 28 publications

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“…Recently developed FFPs, such as those described by Stegmann et al (2006), Mosher et al (2007), Stark et al (2009), Young et al (2011) and Stephan et al (2012), are essentially dynamically launched cone penetrometers with 608 cone tips and diameters in the range 0 . 04-0 .…”

Section: Introductionmentioning

confidence: 99%

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Soil strength estimation and pore pressure dissipation for free-fall piezocone in soft clay

Chow¹,

O’Loughlin²,

Randolph³

2014

Géotechnique

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This paper considers centrifuge modelling of free-fall piezocones in soft clay, and interprets the test data to estimate the undrained shear strength and coefficient of consolidation. Data from the free-fall piezocones, which involved dynamic embedment in a normally consolidated kaolin clay sample from various drop heights, were compared with equivalent data from piezocone tests. The undrained shear strength, as interpreted from the acceleration trace of the free-fall piezocone, was found to be in good agreement with that derived from the piezocone penetration tests. The free-fall piezocone is also found to produce identical pore pressure dissipation behaviour as for a statically penetrated piezocone, despite a significant rise in the pore pressure at the start of the dissipation phase.

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Section: Introductionmentioning

confidence: 99%

“…Stegmann et al, 2006;Mulukutla, 2009;Stark et al, 2009;Buhler & Audibert, 2012;Stephan et al, 2012;Steiner et al, 2014). However, relatively few laboratory FFP model tests have been reported.…”

Section: Introductionmentioning

confidence: 99%

Soil strength estimation and pore pressure dissipation for free-fall piezocone in soft clay

Chow¹,

O’Loughlin²,

Randolph³

2014

Géotechnique

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“…Stephan et al 2011Stephan et al , 2012 in combination with a measurement lance measures a kinematic quantity such as acceleration (a) or deceleration (-a) as the lance penetrates into sediment. Tip resistance vs. depth is derived from this kinematic dataset.…”

Section: Lirmeter Impact Penetrometermentioning

confidence: 99%

“…The LIRmeter, described in detail in Stephan et al (2012), consists of a lance that is up to 6 m in length and a weight stand that contains the instruments for data acquisition (i.e., the actual LIRmeter). The accelerometers have different sensitivities and measurement ranges (see Table 2), which enables the LIRmeter to cover a wide range of sedimentary conditions without having to change the sensors.…”

Section: Lirmeter Impact Penetrometermentioning

confidence: 99%

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Validation of impact penetrometer data by cone penetration testing and shallow seismic data within the regional geology of the Southern North Sea

2015

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This study presents the assessment of total cone resistance from in situ deceleration measurements using the Lance Insertion Retardation meter (LIRmeter) in the Southern North Sea. The penetrometer is equipped with a measurement lance that is up to 6 m in length. The aim was to validate LIRmeter data interpretation within the regional geological context by comparison with static velocity cone penetration testing (CPT) and sub-bottom profiles. In total, 13 datasets were taken, in addition to preexisting hydroacoustical and static velocity CPT datasets. The dynamically acquired data were processed and compared to the reference static velocity data. The validation encourages the use of acceleration-based dynamic penetration tests, since a high degree of agreement was demonstrated between independently acquired dynamic and static cone resistance data. Moreover, the results reveal evidence of two successive formations with different geotechnical properties, consistent with existing knowledge on the regional setting. Additionally, there is novel indication of an incised glacial valley with muddy low-permeability sediments extending much further than reported to date, which would necessitate updating of older maps. The main advantage of penetrometer-based deceleration measurements lies in the robustness of the method, and the reliability of the sensors. However, penetration depth is, for dimensioning reasons, limited to the order of a few meters. Additionally, data processing includes the dependency of knowledge about the soil type to correct the dynamic data. These limitations can be satisfactorily outweighed by combination with reference data from static velocity tests, as demonstrated by integrating these data into a soil classification scheme.

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Variability of in situ sediment strength and pore pressure behavior of tidal estuary surface sediments

et al. 2017

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The Lance Insertion Retardation meter (LIRmeter): an instrument for in situ determination of sea floor properties—technical description and performance evaluation

Cited by 11 publications

References 28 publications

Soil strength estimation and pore pressure dissipation for free-fall piezocone in soft clay

Soil strength estimation and pore pressure dissipation for free-fall piezocone in soft clay

Validation of impact penetrometer data by cone penetration testing and shallow seismic data within the regional geology of the Southern North Sea

Variability of in situ sediment strength and pore pressure behavior of tidal estuary surface sediments

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