Pressure-controlled cavity expansion in clay

Au, A.S.K.; Yeung, Albert T.; Soga, Kenichi

doi:10.1139/t06-037

Cited by 32 publications

(10 citation statements)

References 19 publications

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“…The measured fracturing pressure of approximately 300 kPa is approximately 9 times the undrained shear strength, i.e., 34 kPa. The result is consistent with the theoretical ultimate cavity expansion pressure in soil (Au et al 2006). However, the magnitude of fracturing pressure is dependent on injection rate and overconsolidation ratio of the soil (Mori and Tamura 1987;Au 2001;Soga et al 2003), as shown in Fig.…”

supporting

confidence: 90%

Discussion of “Forms and sand transport in shallow hydraulic fractures in residual soil”Appears in Canadian Geotechnical Journal, 43: 1061–1073.

Yeung

2007

Can. Geotech. J.

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supporting

confidence: 90%

Discussion of “Forms and sand transport in shallow hydraulic fractures in residual soil”Appears in Canadian Geotechnical Journal, 43: 1061–1073.

Yeung

2007

Can. Geotech. J.

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“…The two problems (i.e., pressure-controlled and displacement-controlled) have various applications in geotechnical engineering problems. For instance, pressuremeter tests (PMTs) and compaction grouting are pressure-controlled problems (Au et al 29 ). However, the displacement-controlled cavity expansion problem is more appropriate for interpreting the penetration problems of cone penetrometers, driven piles, PVDs, flat dilatometers (DMTs), and others.…”

Section: Introductionmentioning

confidence: 99%

A semi‐analytical solution for displacement‐controlled elliptical cavity expansion in undrained MCC soil

Zhou

Liu

Wang

2021

Num Anal Meth Geomechanics

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Conventional cavity expansion theory is a one-dimensional problem and is not applicable for the two-dimensional cavity expansion issue, which is also required for geotechnical problems. This paper proposes a novel semi-analytical solution for displacement-controlled elliptical cavity expansion (DC-ECE) in undrained soil. The displacement and strain fields for DC-ECE are obtained from the strain path method (SPM) with the aid of conformal mapping theory. The effective stress can be subsequently obtained by the incremental stress-strain calculation using a suitable constitutive model such as the MCC model. Then, the computed effective stress results are substituted into the stress equilibrium equation to give the pore pressure solution. The new semi-analytical solution reveals the non-axisymmetric characteristics of DC-ECE and allows the elastic-plastic (EP) boundary, excess pore pressure, stress, and displacement to be calculated.The proposed method provides a solution to non-axisymmetric cavity expansion issues and it can be applied to geotechnical engineering problems, including vertical drain installation, flat dilatometer tests and noncylindrical pile penetration in clay.

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“…Numerous studies show that particle shape has a significant influence on properties of engineering interest for granular soils (Chang et al, 2018;Cho et al, 2006a;Holubec and D'Appolonia, 1973;Liu and Lehane, 2013;Santamarina and Cho, 2004;Vaid et al, 1985;Yang and Luo, 2015). To incorporate this knowledge into geotechnical practice it is necessary to measure shape.…”

Section: Introductionmentioning

confidence: 99%

Sphericity measures of sand grains

Rorato

Arroyo

Andò

et al. 2019

Engineering Geology

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The sphericity of a grain should measure the similitude of its shape with that of a sphere. Sphericity as shape descriptor is of traditional interest for sedimentology. Now it has gained also interest to facilitate discrete element modelling of granular materials. True sphericity was initially defined by a surface ratio that requires three-dimensional (3D) grain surface measurement. That kind of measurement has been practically impossible until recently and, as a consequence, a number of alternative 3D measures and 2D proxies were proposed. In this work we present results from a study of grain shape based on x-ray tomography of two different sand specimens, containing more than 110.000 particles altogether. Sphericity measures were systematically obtained for all grains. 2D proxy measures were also obtained in samples of oriented and not-oriented grains. It is shown that the 2D proxy best correlated with true sphericity is perimeter sphericity, whereas the traditional Krumbein-Sloss chart proxy is poorly correlated. 2D measures acquired through minor axis projection are more closely related to 3D measures than those acquired using random projections.

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Pressure-controlled cavity expansion in clay

Cited by 32 publications

References 19 publications

Discussion of “Forms and sand transport in shallow hydraulic fractures in residual soil”Appears in Canadian Geotechnical Journal, 43: 1061–1073.

Discussion of “Forms and sand transport in shallow hydraulic fractures in residual soil”Appears in Canadian Geotechnical Journal, 43: 1061–1073.

A semi‐analytical solution for displacement‐controlled elliptical cavity expansion in undrained MCC soil

Sphericity measures of sand grains

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