Research of the collapsibility of the European loess – review

Lal, Agnieszka

doi:10.24358/bud-arch_19_181_01

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Their high variability is also reflected by the parameters measured in in situ tests. Loess are considered to be specific soils and are mainly associated with the phenomenon of collapsibility, which is associated with macroporosity [12][13][14]. It is also important that most of the loess subsoil, in particular silty "typical loess", occurs in the unsaturated state.…”

Section: Geological Characteristics Of Loessmentioning

confidence: 99%

Geotechnical Interpretation of the Geological Structure of Loess Covers in Lublin Region

Nepelski

2023

Architecture, Civil Engineering, Environment

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The characteristic feature of the geological structure in the Lublin Region is loess covers, which at the same time constitute the main subsoil for setting building structures. Geological structure is the basis for developing a geotechnical model of the subsoil, which may be identical to the geological model. However, these two types of models in many cases should differ, because the geotechnical model is developed depending on the type of structure, its dimensions, the method and depth of the foundation, and the loads transferred. Identifying geological layers only on the basis of lithology and subsoil state leads to significant and excessive simplification, especially when these layers occur at different depths. Soil stiffness and its bearing capacity depend not only on the state, i.e. wetness but also on several other factors which are difficult to identify based on a superficial macroscopic assessment, even with the verification of individual samples with laboratory tests. A good foundation for the geotechnical assessment of the subsoil is provided by in situ tests such as CPTU and DMT, which allow for a statistical evaluation of parameters. The work presents the methodology for creating a geotechnical model of the loess subsoil based on in situ tests.

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Section: Geological Characteristics Of Loessmentioning

confidence: 99%

Geotechnical Interpretation of the Geological Structure of Loess Covers in Lublin Region

Nepelski

2023

Architecture, Civil Engineering, Environment

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“…slightly negative Aeolian (older) 8.87/3.12 2.82/0.86 A common problem for loess is collapsibility [40][41][42][43][44]. Although this behavior is strongly associated with this soil, in practice it only affects a small part of it.…”

Section: Qcmean/σ (Mpa)mentioning

confidence: 99%

CPT Parameters of Loess Subsoil in Lublin Area

Nepelski

Lal

2021

Applied Sciences

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Loess soils were created by the wind transporting particles with later or in parallel occurred protogenetic, syngenetic and epigenetic processes. As a result, various genetic processes affected loesses strength and deformability characteristics. The aim of the study is to estimate the main CPT parameters of loess subsoil in Lublin area according to divided facies. The subsoil in the area of the Nałęczowski Plateau, where Lublin is located, consists mainly of loess from aeolian and aeolian–diluvial facies, and in the deeper parts—from aeolian–alluvial facies. Most of the results obtained for the aeolian facies at the level of qc in the range from 4.5 to 8.0 MPa indicate that these soils are a good load-bearing substrate for building structures. Cone resistances mostly at the level of 1.5–4.0 MPa for the diluvial and alluvial facies confirm that these facies constitute less favorable foundation conditions. The reduced resistance results mainly from the increased water content in ground pores. It is especially the soils of the diluvial facies that provide unfavorable foundation conditions, as they occur near the surface. Genetic processes are a very important element that should be taken into account in engineering research.

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DEM analyses of true triaxial and wetting tests on unsaturated structural loess

Jiang

Wang

Lei

et al. 2020

JGS Special Publication

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Three-dimensional DEM (discrete element method) simulations of the true triaxial and wetting tests were conducted to study the macroscopic and microscopic mechanical properties of unsaturated structural loess under complex stress state. The simulation results were analyzed in terms of stress-strain relationships, void ratio responses and bond breakage number with water content. It is shown that collapsing failure occurs when the deviatoric stress approaches or exceeds the peak shear strength of the corresponding saturated structural loess sample. There is little difference in the axial strain between the quick wetting (QW) method and gradual wetting (GW) method, and the volumetric strain of the samples wetted by QW are larger than that by GW specimen. The bond breakage number of the sample wetted by QW is slightly higher than that by GW. However, the bond breakage number of the sample wetted by the two wetting methods is slightly higher than that of the saturated structural loess sample subjected to the same stress state.

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Research of the collapsibility of the European loess – review

Cited by 3 publications

References 20 publications

Geotechnical Interpretation of the Geological Structure of Loess Covers in Lublin Region

Geotechnical Interpretation of the Geological Structure of Loess Covers in Lublin Region

CPT Parameters of Loess Subsoil in Lublin Area

DEM analyses of true triaxial and wetting tests on unsaturated structural loess

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