Collapse Potential and Geotechnical Characterization of Sandy Loess-Like Deposits in Southern Vietnam

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F25%3A00638877" target="_blank" >RIV/67985891:_____/25:00638877 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/s10706-025-03288-8" target="_blank" >https://doi.org/10.1007/s10706-025-03288-8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10706-025-03288-8" target="_blank" >10.1007/s10706-025-03288-8</a>

Result language

angličtina

Original language name

Collapse Potential and Geotechnical Characterization of Sandy Loess-Like Deposits in Southern Vietnam

Original language description

The collapse potential of loess is a distinctive geotechnical property influenced by moisture variation. In southern Vietnam, the collapse potential and geotechnical characteristics of a sandy loess-like deposit (SLD) have not been fully investigated. This study addresses this gap through in situ and laboratory testing. The SLD is classified as silty sand, comprising well-sorted fine sand with silt and clay. Coarse grains are sub-angular to sub-rounded, coated with clay, forming a metastable open structure characteristic of aeolian deposits. Plate load testing at the natural moisture content and saturation level (w= 5.6%, S= 32.3%) under 70 kPa stress showed no collapse, but immediate collapse occurred after saturation. Laboratory oedometer testing under saturated conditions (w= 17.3%, S= 99.8%) and 200 kPa stress revealed moderate collapse (collapse potential index δ= 4.4%), consistent with in situ testing (δ= 5.1%). Cone penetration resistance (qc= 4.2–9.8 MPa) decreases with increasing moisture content (w= 2.3–10.0%), dropping to 2.0–4.3 MPa under saturated conditions (w= 15.1–17.3%, S= 87.1–99.8%). The undrained shear strength is 76 kPa with a sensitivity of 3.8. Compacted soil yields a maximum dry unit weight of 18.3 kN/m3 at 10.6% moisture. Cohesion strongly affects compacted soil shear strength. At 50 kPa normal stress, shear strength and cohesion decrease by 24.2% and 67.9%, respectively. Over four weeks at optimum moisture, shear strength rises by 28.9% as cohesion improves. The SLD has lower collapse potential than the sandy yellow loess in northeastern Thailand, but still requires careful foundation assessment as a soft soil.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20701 - Environmental and geological engineering, geotechnics

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geotechnical and Geological Engineering

ISSN

0960-3182

e-ISSN

1573-1529

Volume of the periodical

43

Issue of the periodical within the volume

7

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

16

Pages from-to

326

UT code for WoS article

001559625500043

EID of the result in the Scopus database

2-s2.0-105013867197