September 2024
·
10 Reads
·
2 Citations
Transportation Geotechnics
What is this page?
This page lists works of an author who doesn't have a ResearchGate profile or hasn't added the works to their profile yet. It is automatically generated from public (personal) data to further our legitimate goal of comprehensive and accurate scientific recordkeeping. If you are this author and want this page removed, please let us know.
Publications (487)
May 2024
·
20 Reads
·
1 Citation
SOILS AND FOUNDATIONS
The creep (CP) strain and stress relaxation (SR) of a clean sand, KMUTT sand, exhibiting non-Isotach viscous properties were evaluated by consolidated-drained triaxial compression (CDTC) tests on air-dried specimens. The test results are analysed based on the nonlinear three-component (NTC) model. Consistent simple empirical equations were derived to predict the elapsed time and the irreversible strain when a given irreversible strain rate takes place during CP loading from those at the same irreversible strain rate during SR loading. Noting that short-term SR tests are much simpler to perform than long-term CP tests, particularly when using an ordinary displacement-controlled axial loading device, a simple empirical method consisting of these empirical equations was formulated to predict creep strain for a relatively long period from SR behaviour for a relatively short period. The creep strains predicted by this empirical method are well comparable with the test results and also with those simulated by the NTC model. It is argued that prediction by the empirical method is relevant in case it is not practical to perform the NTC model simulation.
May 2023
·
5 Reads
May 2023
·
9 Reads
May 2023
·
17 Reads
May 2023
·
1 Read
May 2023
·
11 Reads
·
3 Citations
May 2023
·
5 Reads
March 2023
·
2 Reads
·
1 Citation
Japanese Journal of JSCE
To evaluate the compaction characteristics of field fill materials containing large gravel particles, it is desirable to conduct large-scale compaction tests on field materials. However, due to many restrictions, it is usual to conduct laboratory compaction tests on specimens with reduced maximum particle sizes and correct the obtained results using the Walker-Holtz equation (W&H Eq.) to the field value. It is known that the W&H Eq. has limitations in its accuracy, while its trend varies from soil to soil. In this study, to accurately estimate the compaction characteristics of fill materials in the field, a series of laboratory compaction tests were conducted on specimens of different gravelly soil types prepared by changing the maximum particle size, producing different particle size distribution curves and mixing different soil types. It was revealed that the ratio of the dry density predicted by the W&H Eq. to the measured value increases linearly with an increase in the gravelly particle mass ratio, while the prediction by the W&H Eq. becomes less accurate with an increase in the coefficient of uniformity or fines content before mixing of gravelly particles and with an increase in the angularity of mixed gravel particles with well-graded samples. In addition, a method was proposed to correct the W&H Eq. and estimate the compaction density of field fill materials containing large gravel particles.
August 2022
·
10 Reads
·
1 Citation
Journal of Japan Society of Civil Engineers Ser C (Geosphere Engineering)
When triaxial compression (TC) tests are performed for the design of fills of sandy soil, the specimens are usually prepared by uniform compaction in the laboratory. On the other hand, in field compaction, the dry density, ρd, noticeably decreases with depth in each compaction layer, while the surface layer of fill may be considerably disturbed due to local shear failure at the contact with a rigid steel roller. In this study, full-scale compaction tests were performed at various compaction energy levels in a wide range of ρd and water content, w, and the strength and deformation characteristics of field-compacted sandy soil were evaluated by TC tests on undisturbed samples from the test fills and those compacted in the laboratory. Empirical equations expressing the strength and stiffness of compacted soil were derived, which consists of an increasing function of ρd multiplied by a decreasing function of the degree of saturation, Sr. The equations take into account the effects of compaction disturbance and wetting/saturation while not including the compaction energy and compaction method as variables. It is shown that, when compacted at Sr equal to, or around, the optimum degree of saturation, (Sr)opt, the effects of these factors are negligible, so, results of TC tests on unsaturated specimens compacted in the laboratory are applicable to the design field conditions.
Citations (63)
... The compacted dry density of gravelly soils containing particles that are too large for ordinary laboratory compaction tests is usually estimated by measuring the dry density of the base sample obtained by removing over-sized particles then correcting the measured value by the Walker-Holtz Equation. Authors were proposed efficient compaction method for gravelly soils containing oversized particles that controls the degree of saturation and the compaction energy [6]. ...
- Citing Article
September 2024
Transportation Geotechnics
... Only a few studies have focused on the resistance of GRS structures against overflowing. Matsushima et al. (2007) proposed protecting the downstream slope by using inclined soil bags anchored with geosynthetic reinforcement to increase the stability of small earth-fill dams against overflowing. Full-scale model tests on the hydraulic overflow-induced collapse of the downstream slope were performed and indicated that geosynthetic soil bags with extended tails (GSET) were sufficiently stable against overflow. ...
- Citing Chapter
May 2023
... To investigate the correlation between the soil stiffness index of an unsaturated compacted soil measured in the field and the strength and stiffness obtained via a triaxial compression test on soil compacted in a laboratory under wet/saturated conditions, the authors compared the difference in the strength deformation characteristics between a laboratorycompacted and a field-compacted specimen with the same fill material (Tomita et al. 2021), (Tomita et al. 2022). ...
- Citing Article
August 2022
Journal of Japan Society of Civil Engineers Ser C (Geosphere Engineering)
... To investigate the correlation between the soil stiffness index of an unsaturated compacted soil measured in the field and the strength and stiffness obtained via a triaxial compression test on soil compacted in a laboratory under wet/saturated conditions, the authors compared the difference in the strength deformation characteristics between a laboratorycompacted and a field-compacted specimen with the same fill material (Tomita et al. 2021), (Tomita et al. 2022). ...
- Citing Article
December 2021
Japanese Geotechnical Journal
... The interaction between these devices and the soil is a contact mechanics problem, where factors like void ratio, gravimetric water content, and suction significantly influence the stress transfer and sensing records [12,13]. When crucial factors like gravimetric water content and suction are not measured, it becomes difficult to link key properties like void ratio or dry density to the data from deflection tests [17,27,34,37]. ...
- Citing Article
July 2021
SOILS AND FOUNDATIONS
... A series of undrained triaxial compression (TC) tests were also performed on specimens compacted to the field densities and those compacted looser or denser. Undrained shear strengths before and after undrained cyclic loading (UCL) histories causing different strains were also evaluated [4,5]. ...
- Citing Chapter
June 2018
... A series of undrained triaxial compression (TC) tests were also performed on specimens compacted to the field densities and those compacted looser or denser. Undrained shear strengths before and after undrained cyclic loading (UCL) histories causing different strains were also evaluated [4,5]. ...
- Citing Chapter
June 2018
... The vibratory probe can effectively compact the ground because it vibrates within the ground. In the construction of foundations, the work involving the compaction of the ground and the evaluation of the compaction effect are generally separate [14]. The reason is that it is possible to make enough time to evaluate the compaction effect after imparting vibration. ...
- Citing Article
March 2021
Japanese Geotechnical Journal
... Depending on the soil embankment materials, this selected soil will spread out and compact using compactor vehicles, which are roller or vibro roller. The quality control of soil embankment can be done by evaluating the parameters, including dry density, compaction energy and saturation degree [2] [3], California Bearing Ratio (CBR) [4], subgrade modulus by performing static plate load test (Plate Bearing test) [5] [6], and dynamic cone penetration (DCP) index [7]. The dry density parameters are the most popular applied in the field [8] [9]. ...
- Citing Article
January 2021
Journal of Japan Society of Civil Engineers Ser C (Geosphere Engineering)
... The legitimacy of the above statement is confirmed by the results presented in the works of e.g. Burland (1989), Mair (1993), Jardine and Symes (1995) and Tatsuoka, Shibuya and Kuwano (2001) and others (Fares et al. 2019, Lade 1977, Look 2007, in which the most common range of soil strain in the conditions of interaction with building structures is in the range γ=1⋅10 -6 ÷1⋅10 -2 . This means that the scope of soil-structure interaction should be considered in the range of small strain. ...
- Citing Chapter
April 2018
