Piezocone evaluation of undrained strength in soft to firm offshore clays

Mayne, P W; Peuchen, Joek; Baltoukas, Dimitris

doi:10.1201/b18442-162

Cited by 10 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…worldwide study conducted byLow et al (2010) concludes that N kt would typically lie within a range of 10 and 14 for lightly overconsolidated clays and recommends N kt = 12 for the triaxial compression undrained shear strength (CAUC) as well. Similar values were also found byLunne et al (2005) andMayne et al (2015), with proposed N kt factors of 12 and 11.8 respectively, for piezocone tests carried out in soft-firm intact clays (CAUC).…”

supporting

confidence: 83%

See 1 more Smart Citation

Measuring strength and consolidation properties in lacustrine clay using piezocone and self-boring pressuremeter tests

Schneider

Whittle²,

Springman

2022

Can. Geotech. J.

View full text Add to dashboard Cite

As a result of the growing population in Switzerland, new infrastructure is increasingly founded in areas of extremely soft clays, which are challenging to build on. Reliable characterisation of such sediments is, therefore, essential to facilitate efficient and economical designs. For various reasons, it is often beneficial to measure soil properties in-situ, using probes like the piezocone or self-boring pressuremeter. The main objective of this study is to explore the key differences of these two site investigation techniques in terms of measuring undrained strength and consolidation characteristics in varved lacustrine clay. Experimental data from a field-testing campaign carried out in Switzerland demonstrates that both probes yield comparable results. The quality of the predictions is further assessed by comparing the field measurements to results from laboratory tests and existing empirical relationships. Additionally, a new method based on Monte Carlo Simulations is presented, to provide context to the disparity between the consolidation coefficients estimated in the field (ch) and laboratory (cv), and to aid prediction of field values of ch from laboratory measurements.

show abstract

supporting

confidence: 83%

“…Robertson 1990Robertson , 2009Robertson and 2016, but can also be used to assess soil properties, such as stiffness, strength or consolidation parameters (e.g. Mayne et al 2015;Teh and Houlsby 1991). A more comprehensive description of the testing system and practices can be found in Lunne et al (1997).…”

Section: Introductionmentioning

confidence: 99%

Measuring strength and consolidation properties in lacustrine clay using piezocone and self-boring pressuremeter tests

Schneider

Whittle²,

Springman

2022

Can. Geotech. J.

View full text Add to dashboard Cite

show abstract

“…Hasil kuat geser yang didapat akan diverifikasi menggunakan hasil uji laboratorium Triaxial. (Mayne et al, 2015) mengevaluasi faktor konus Nkt menggunakan alat CPTu untuk kuat geser undrained tanah lempung. Nilai faktor Nkt memiliki rentang dari 8 -25 pada tanah lunak lepas pantai, tanah lunak daratan, sampai lempung teguh, dan nilai Nkt menurun sejalan dengan meningkatnya nilai Bq.…”

Section: Pendahuluanunclassified

Pengaruh Koefisien Nk Terhadap Kuat Geser Tanah Lunak Gedebage Berdasarkan Uji CPTu

Desiani,

Wiyono,

Pramono

2024

jts

View full text Add to dashboard Cite

Alat uji lapangan Cone Penetration Test (CPT) yang biasa kita sebut sondir telah banyak digunakan di Indonesia. Namun penggunaan Cone Penetration Test dengan pengukuran air pori (CPTu) belum digunakan secara luas, karena itu penelitian ini akan dilakukan secara langsung di lapangan (in situ) menggunakan alat CPTu. Pengujian in-situ memiliki keunggulan antara lain parameter tanah yang diperoleh pada kondisi tegangan yang sesungguhnya di lapangan, data yang diperoleh bersifat kontinu sepanjang kedalaman dan dapat mengatasi masalah pengambilan sampel ataupun ketergangguan sampel. Lokasi penelitian berada pada kawasan Gedebage Bandung yang saat ini mengalami perkembangan yang luar biasa. Tanah pada kawasan tersebut merupakan tanah lunak yang pada umumnya memiliki kuat geser rendah. Penentuan kuat geser lempung (Su) merupakan rasio net cone resistance dan faktor konus (Nkt). Penelitian lebih mendalam terhadap koefisien Nkt dalam evaluasi kuat geser tanah lunak berdasarkan data hasil uji CPTu akan di verifikasi menggunakan uji laboratorium. Hasil penelitian menunjukkan koefisien Nkt yang sesuai untuk kawasan Gedebage adalah 13-15. Rentang parameter kuat geser hasil uji laboratorium dan hasil uji CPTu di lapangan adalah sebagai berikut: kedalaman 0-10m Su >25 kPa, kedalaman 10-25m Su berkisar 10 kPa dan kedalaman 25-31m Su >100 kPa.

show abstract

“…Various theoretical and numerical solutions have been proposed to establish the appropriate Nkt, including those based on limit plasticity, cavity expansion theory, strain path method, as well as numerical finite element simulations (e.g. Konrad & Law 1987;Mayne 2016;Teh & Houlsby 1991;Lu et al 2004). However, these approaches require additional input parameters, such as the rigidity index, cone roughness, lateral stress state, friction angle, and other variables, which must be determined prior to their application.…”

mentioning

confidence: 99%

“…Consequently, site-specific calibrations against laboratory results or FVSTs are generally used to determine the strength factor. It should be mentioned that shear strength is not a unique value for a given soil or tailings, but rather depends on various factors such as the mode of shearing, rate of loading, failure mode and other variables (Mayne 2008). Therefore, when determining Nkt through site-specific calibrations, the choice of reference test for measuring the undrained shear strength, such as triaxial or vane shear impacts the Nkt value.…”

mentioning

confidence: 99%

A comparison between in situ techniques to measure undrained shear strength of oil sands tailings

Entezari¹,

McGowan²,

Glavina³

et al. 2023

Paste 2023: 25th International Conference on Paste, Thickened and Filtered Tailings

View full text Add to dashboard Cite

A comprehensive comparison between undrained shear strength (Su) measured from piezocone penetration tests (CPTu), piezoball penetration tests (BCPTu), and electronic field vane shear tests (eVST) in soft tailings is presented. To evaluate the comparability of Su from both penetrometers and eVST, a comparative study was performed using data collected from oil sands tailings storage facilities in northern Alberta, Canada. Two paired datasets of eVST-CPTu and eVST-BCPTu were compiled and the relationships between Su values from the three strength measurement techniques were explored. Results show that Nkt and Nball of 15 and 12.2 are reasonable values to scale net tip resistance and determine the strength in soft tailings from CPTu and BCPTu, respectively. Furthermore, comparing to eVST results, both CPTu and BCPTu penetrometers were found to be effective tools in profiling the strength of soft tailings when Su is less than 10 kPa. BCPTu was observed to be slightly more accurate than CPTu in very low strength fluid-like tailings.

show abstract

Piezocone evaluation of undrained strength in soft to firm offshore clays

Cited by 10 publications

References 0 publications

Measuring strength and consolidation properties in lacustrine clay using piezocone and self-boring pressuremeter tests

Measuring strength and consolidation properties in lacustrine clay using piezocone and self-boring pressuremeter tests

Pengaruh Koefisien Nk Terhadap Kuat Geser Tanah Lunak Gedebage Berdasarkan Uji CPTu

A comparison between in situ techniques to measure undrained shear strength of oil sands tailings

Contact Info

Product

Resources

About