Cone penetration collapsible loess

Cone penetration collapsible loess
This study focuses on loess interfaces and employs cone penetration tests to clarify variations in cone tip resistance during penetration, utilizing finite element simulations to elucidate the underlying microscopic mechanisms.
Aug 21, 2024
Apr 29, 2025
Jun 4, 2025
The modification methods of collapsible loess can be divided into two categories: physical modification and chemical modification. Physical modification methods such as the water immersion method and the deep ramming method realize modification by changing the pore structure and particle arrangement of the soil.
Effect on the treatment for collapsible loess foundation by dynamic compaction is analyzed through Rayleigh wave velocity test, standard penetration test, lab soil test and static cone penetration test.
Aug 21, 2024
To establish the connection between the disintegration velocity of loess soil and other parameters, a series of indoor and in situ tests was conducted, including density test, compression test, direct shear test, collapsibility test, standard penetration test (SPT) and cone penetration test.
The collapsibility of loess means that after water infiltrates into the pores between the loess particles, it destroys the original pore structure of loess and causes the strength of loess to rapidly decrease. Under the action of its own gravity loads and the gravity loads of water, the phenomenon of overall settlement and collapse appears.
PDF | Loess is a kind of special sediment with pore structure and rich carbonate in its composition. Due to the characteristics of structure and... | Find, read and cite all the research you need ...
Mar 22, 2025
To establish the connection between the disintegration velocity of loess soil and other parameters, a series of indoor and in situ tests was conducted, including density test, compression test, direct shear test, collapsibility test, standard penetration test (SPT) and cone penetration test.
By developing a borehole micro static cone penetration system and creating various types of loess with interfaces, extensive borehole penetration model tests were conducted to observe changes in cone tip resist-ance during penetration. The response surface method was used to analyze the impact of various test conditions on the calculated ...
The results are presented of a project at the construction of the Zhong-Lan high-speed railway, comprising laboratory tests and field tests including standard penetration tests and cone penetration tests. Spectral analysis of surface wave tests were conducted before and after treatment.
Loess is characterized by an open structure of fine volcanic sand and silt particles with connecting clay bridges and buttresses at contacts. At low moisture content, the formation presents high ...
The standard penetration and static cone penetration Argentinean loess is the largest deposit of its kind in testing. The effect of mean confining stresses and the southern hemisphere.
The results are presented of a project at the construction of the Zhong-Lan high-speed railway, comprising laboratory tests and field tests including standard penetration tests and cone penetration tests. Spectral analysis of surface wave tests were conducted before and after treatment.
The results are presented of a project at the construction of the Zhong-Lan high-speed railway, comprising laboratory tests and field tests including standard penetration tests and cone penetration tests. Spectral analysis of surface wave tests were conducted bef
Jan 24, 2025
Loess presents very unique collapsible behaviour due to its special under-compactness, weak cementation and porousness. Many environmental issues and geological hazards including subgrade ...
The pile foundation method is also one of the most common and effective solutions for collapsible loess treatment except for its high cost, especially for large treatment areas. In northwestern China, collapsible loess is the most frequently encountered type of soil.
However, permeability velocity increases rather than decreases, and the self-weight collapsible state has the most significant permeability velocity. To the collapsible loess, the permeability velocity decreases with the increase of soil pore area. Additionally, small pores show the strongest correlation with permeability velocity.
Plasticity index is essential for engineering applications, obtaining which would be carried out from situ-fields to the laboratory costly and time-consuming. Cone penetration tests (CPTs), fast, low-cost, reliable and output near-continuous measurement, are widely used in geological and geotechnical engineering, and shallow neural networks can learn and build models of complex nonlinear ...
Abstract A successful case history of using vibratory probe compaction method to treat collapsible loess foundation is presented in this study, where the equipment and execution process of the compaction method are introduced in detail. The results are presented of a project at the construction of the Zhong-Lan high-speed railway, comprising laboratory tests and field tests including standard ...
The cone penetration test, standard penetration test, and transient Rayleigh surface wave test were performed ten days after treatment. The results showed that the collapsibility of the site was eliminated, and the allowable stress was more than twice that of the design criterion (see [9] for more details).
This paper presents the results of an extensive laboratory and field study of Argentinean loess, including shear wave velocity, complex permittivity and conductivity measurements on specimens at different moisture content, down-hole seismic test, standard penetration and static cone penetration testing.
In this paper, the collapsibility mechanism of loess was re-analyzed, and on this basis, a new method for preparing artificial collapsible loess using remolded loess, industrial salt, CaO ...
Loess is a widely-abundant collapsible soil with a microstructure of meta-stable characteristic (Pye 1984; Jefferson et al. 2005). Typically composed of wind-borne sediment, silt-sized particles, this type of soil has some unique physical and chemical characteristics (Smalley 1995; Bell 2013).
Collapsible soils are unsaturated low-density soils that undergo abrupt settlement when flooded without any increase in the in-situ stress level. The first stage of the site characterization is identifying collapsible soils, since these are problematic soils. Seismic cone testing (SCPT) has been increasingly used for site characterization, because it allows combining stratigraphic logging with ...
However, permeability velocity increases rather than decreases, and the self-weight collapsible state has the most significant permeability velocity. To the collapsible loess, the permeability velocity decreases with the increase of soil pore area. Additionally, small pores show the strongest correlation with permeability velocity.
Figure 20. Designs for cone penetrometers (a) tip and sleeve load cells in compression, (b) tip load cell in compression and sleeve load cell in tension, (c) subtraction type load cell design (credits: P. K. Robertson, K. Cabal, Guide To Cone Penetration Testing, 7th Edition. Gregg Drilling LLC, 2022 / modified from Lunne et al., 1997)
To the collapsible loess, the permeability velocity decreases with the increase of soil pore area. Additionally, small pores show the strongest correlation with permeability velocity.
The cone penetration test (CPT) for loess-like silty clay soil in western Henan province was done to obtain the tip resistance and sleeve friction. Then, the relationship of CPT and physico-mechanical parameters of loess-like silty clay soil was analysis.
: The improvement of collapsible loess is one of the technical problems in the development and construction of western China. The collapsible loess covers a large area, and there are many ground treatment projects under construction. The vibratory probe compaction method is first proposed to treat collapsible loess. During the project of Zhongwei-Lanzhou high speed railway, the technology of ...
A cone penetration limit (Plim) is introduced to identify collapsible soil and a correlation between the collapse potential, CP, and the cone penetration, P, was developed and validated with the ...
It is of great importance to study the behavior of loess moisture infiltration based on the loess permeability velocity to prevent geological disasters by loess collapsibility and get effective solutions for the problems of practical engineering. In this study, a custom-made permeation device was used to measure the permeation velocity of collapsible loess before and after water immersion and ...
The results are presented of a project at the construction of the Zhong-Lan high-speed railway, comprising laboratory tests and field tests including standard penetration tests and cone ...
They carried out the water drop penetration time test, flexible wall permeability test, shrinkage test, and dehydration test using a pressure membrane apparatus test to explore the stabilizer influence of the content on the water infiltration and the water loss capacity of the loess.
Understanding the mechanical behavior of compacted loess is of great significance to engineering construction on the Loess Plateau. To gain an in-depth knowledge of the variations in compressibility, shear strength and microstructure of compacted loess at different dry densities and water contents, a series of macro and microscopic tests were carried out on the loess samples, including ...
Download scientific diagram | Overall diagram of borehole micro static cone penetration system from publication: Shear strength parameters identification of loess interface based on borehole micro ...
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