Chaiyaput, Salisa

Preferred name

Chaiyaput, Salisa

Alternative Name

CHAIYAPUT, SALISA

Chaiyaput, S.

Chaiyaput, Salisa Fern

Main Affiliation

School of Engineering

salisa.ch@kmitl.ac.th

Now showing 1 - 10 of 66

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Inspection of bridge failure during construction: A case study of a bridge over a drainage canal
(2025-04-01)
Suksawat, Taweephong
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Ayawanna, Jiratchaya
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Nghia-Nguyen, Trong
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Meetorranee, Thawidej
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Promthong, Boonchom
This paper presents a case study of a bridge failure during construction in an infrastructure development project in Nakhon Si Thammarat, Thailand. This highlights the critical role of thorough inspection and early detection of structural failures. The failure, related to foundation-related issues, shows how even minor errors in the construction sequence can lead to significant structural problems. Key steps for evaluating foundation failures are assessing the structure's movement and utilizing an inclinometer to determine ongoing failure. Resistivity surveys, in conjunction with screw driving sounding tests (SDS), were performed to assess soil properties, while the finite element method (FEM) was applied to validate the observed failure behavior. The results show that an inclinometer effectively monitored these structures’ movement. The resistivity surveys proved useful in identifying soil layers in the wide area. Meanwhile, the SDS tests were able to determine the soil's undrained shear strength. FEM simulations provided valuable insights into the behavior of underground structures. Consequently, comprehensive inspections are essential to mitigate foundation failure risks and ensure critical structures’ safety and longevity.
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Integrating Multiple Linear Regression Analysis and Machine Learning Models to Predict the Bearing Capacity of Strip Footings on Sandy Clay Slopes
(2025-02-01)
Mase, Lindung Zalbuin
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Misliniyati, Rena
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Muharama, Nia Afriantialina
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Supriani, Fepy
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Ahmad, Debby Ariansyah
This paper presents Multiple Linear and Machine Learning models of bearing capacity for strip footings at sandy clay slopes subjected to vertical loads. Several parameters are considered in the analysis, including footing width, embedment depth, unit weight, slope angle, internal friction angle, and soil cohesion. A finite element analysis is conducted to assess the impact of these factors. Additionally, an empirical prediction for bearing capacity is proposed. Machine learning techniques utilising various models are employed to analyse performance outcomes, with the Shapley Additive Explanations (SHAP) method used to quantify the contribution of each parameter. The results show that the empirical formulation for predicting ultimate bearing capacity can be effectively applied in engineering practice. Significantly, the findings indicate that the XGBoost model yields the most precise predictions of bearing capacity. The primary parameters influencing bearing capacity include embedded depth, width, unit weight, and internal friction angle, whereas vertical load and unit weight have a minimal impact.
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Prefabricated Vertical Drain (PVD) and Deep Cement Mixing (DCM)/Stiffened DCM (SDCM) techniques for soft ground improvement
(2018-04-12)
Bergado, D. T.
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Long, P. V.
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Chaiyaput, S.
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Balasubramaniam, A. S.
Soft ground improvement techniques have become most practical and popular methods to increase soil strength, soil stiffness and reduce soil compressibility including the soft Bangkok clay. This paper focuses on comparative performances of prefabricated vertical drain (PVD) using surcharge, vacuum and heat preloading as well as the cement-admixed clay of Deep Cement Mixing (DCM) and Stiffened DCM (SDCM) methods. The Vacuum-PVD can increase the horizontal coefficient of consolidation, C<inf>h</inf>, resulting in faster rate of settlement at the same magnitudes of settlement compared to Conventional PVD. Several field methods of applying vacuum preloading are also compared. Moreover, the Thermal PVD and Thermal Vacuum PVD can increase further the coefficient of horizontal consolidation, C<inf>h</inf>, with the associated reduction of k<inf>h</inf>/k<inf>s</inf> values by reducing the drainage retardation effects in the smear zone around the PVD which resulted in faster rates of consolidation and higher magnitudes of settlements. Furthermore, the equivalent smear effect due to non-uniform consolidation is also discussed in addition to the smear due to the mechanical installation of PVDs. In addition, a new kind of reinforced deep mixing method, namely Stiffened Deep Cement Mixing (SDCM) pile is introduced to improve the flexural resistance, improve the field quality control, and prevent unexpected failures of the Deep Cement Mixing (DCM) pile. The SDCM pile consists of DCM pile reinforced with the insertion of precast reinforced concrete (RC) core. The full scale test embankment on soft clay improved by SDCM and DCM piles was also analysed. Numerical simulations using the 3D PLAXIS Foundation finite element software have been done to understand the behavior of SDCM and DCM piles. The simulation results indicated that the surface settlements decreased with increasing lengths of the RC cores, and, at lesser extent, increasing sectional areas of the RC cores in the SDCM piles. In addition, the lateral movements decreased by increasing the lengths (longer than 4 m) and, the sectional areas of the RC cores in the SDCM piles. The results of the numerical simulations closely agreed with the observed data and successfully verified the parameters affecting the performances and behavior of both SDCM and DCM piles.
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Mitigations of flooding and soil erosions geo-disasters in Thailand and Laos due to climate change: From Mountains to Lowlands
(2017-06-01)
Bergado, D. T.
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Chaiyaput, S.
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Voottipruex, P.
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Hino, T.
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Chanmee, N.
In 2011, Thailand has suffered from devastating flooding due to climate change. During this time, 2 typhoons from the Pacific area went straight across Vietnam to Northern Laos and Northern Thailand instead of the usual path to Taiwan and Japan. Subsequently, huge flooding damaged many infrastructures and overtopped flood protection dikes of many industrial estates and educational institutions in the Central Plain of Thailand such as at Hi-Tech Industrial Estate, Bang Pain Industrial Estate. Navanakom Industrial Estate and Asian Institute of Technology, to name a few. The same phenomenon also occurred in neighboring Laos PDR which caused unusually heavy rains and widespread river flooding. Consequently, riverbank erosions accompanied by slope failures occurred at Xedon River in Pakse, Southern Laos due to saturation caused by high water levels accompanied by high velocity flow of the flooded river. To evaluate the stability of these mitigation structures, finite element and limit equilibrium methods were utilized. PLAXIS 2D software was used to analyze the slope protection schemes at low and high water levels incorporating the various supporting and reinforcing materials. Moreover, the PLAXIS 2D software was also utilized to predict the vertical deformations of improved flood control dikes with increased embankment height at different cases of flood water levels. In addition, the SLIDE software was used to predict the factor of safety by using limit equilibrium method for the various riverbank erosion protection structures. Furthermore. RESSA software was utilized to evaluate the slope stability of the erosion protection structures with geosynthetic reinforcements of Xedon riverbank in Pakse combined with gabions and mattresses. Laos PDR is mountainous with high elevations.
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Utilization of ladle furnace slag from a steelwork for stabilization of soil cement
(2022-10-25)
Ayawanna, Jiratchaya
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Kingnoi, Namthip
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Sukchaisit, Ochakkraphat
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Chaiyaput, Salisa
Ladle furnace (LF) slag, waste from the steel-making process, was incorporated to improve the compressive strength of soil cement. LF slag was mixed to replace the cement in the soil-cement samples with wt% ratio 20:0, 15:5, and 10:10 of cement and slag, respectively. LF slag in the range of 5, 10, and 20 wt% was also separately added to the 20-wt% cement-treated soil samples. The soil-cement mixed LF slag samples were incubated in a plastic wrapping for 7, 14, and 28 days. The strength of soil cement was highly developed to be higher than the standard acceptable value (0.6 MPa) after incorporating slag into soil cement. The mixing of LF slag resulted in more hydration products for bonding soil particles, and hence improved the strength of soil cement. With the LF slag mixing either a replacement or additive materials in soil cement, the LF slag to cement ratio is considered to be less than 1, while the cement content should be more than 10 wt%. This is to promote a predominant effect of cement hydration by preventing the partially absorbed water on slag particles and keeping sufficient water content for the cement hydration in soil cement.
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Comparative Study of Evaluations of Bearing Capacity Using Conventional Method and Finite Element Method
(2024-01-01)
Manandhar, Suman
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Karmacharya, Sunny
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Vootripruex, Panich
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Chaiyaput, Salisa
Kathmandu Clay, also called the black clay, found near the sub-surface of the valley sediments, incorporating with its low strength and high compressibility. In this research, the vertical bearing capacity of strip footing on Kathmandu Clay was analyzed using Mohr–Coulomb soil model both in drained and undrained conditions through finite elements. The analyses were focused on the failure patterns of the footing for both drained and undrained conditions. The failure analyses showed a varying degree of effects of the friction angle of the soil both in drained and undrained conditions. The results were further compared with Vesic’s and Prandtl’s methods of evaluating bearing capacities. Hence, obtained results of simulated failure plane and the conventional one preceded by Prandtl show a good agreement between each other and validated the results.
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Effect of polymer and Portland cement on strengthen crushed rock for pavement base
(2019-01-01)
Chaiyaput, S.
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Bergado, D. T.
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Ayawanna, J.
The effect of concurrent use of liquid polymer and Portland cement as a reinforced material in crushed rock pavement base was investigated in this work. The strength of polymer-treated crushed rock (treated crushed rock) and ordinary crushed rock (untreated crushed rock) were characterized and compared. In strength analysis, the California bearing ratios (CBR) of untreated and treated crushed rock were determined under unsoaked and soaked conditions to simulate post-flood pavement damage. The unconfined compressive strength (UCS) was evaluated under unsoaked conditions for 2h, 1-day, 3-day, 7-day, and 28-day curing periods. The results showed that the CBR of untreated and treated crushed rock under soaked and unsoaked conditions were positively correlated with dry density. The CBR under the unsoaked condition of untreated crushed rock was identical to that of treated crushed rock. Meanwhile, under the soaked condition, the CBR of treated crushed rock was twice as higher than the untreated crushed rock. The swelling indices were 0% for both untreated and treated samples. The UCS of treated crushed rock showed positively correlation with the curing time. The use of liquid polymer and Portland cement, therefore, improved the strength of crushed rock pavement base in which effectively mitigate the post-flood pavement damage.
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Microstructures within and outside the smear zones for soft clay improvement using PVD only, Vacuum-PVD, Thermo-PVD and Thermo-Vacuum-PVD
(2020-12-01)
Bergado, Dennes T.
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Chaiyaput, Salisa
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Artidteang, Suthasinee
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Nguyen, Trong Nghia
Previous investigators have found increasing rates odf consolidation with increasing degrees of soft clay improvement using PVD only, Vacuum-PVD, Thermo-PVD and Thermo-Vacuum-PVD). This paper utilized scanning electron microscope (SEM) to evaluate and compare the microstructures of the clay specimens obtained from within the smear zone of both undisturbed and reconstituted samples in small consolidometer as well from within and outside the smear zone of reconstituted samples in large consolidometer. Before improvement, both reconstituted and undisturbed specimens showed anisotropic microstructures. In reconstituted specimen, face to face preferred orientations are revealed parallel to the horizontal plane. Meanwhile, in the undisturbed specimen, some degree of random edge to face mixed with face to face orientations were displayed. After improvement, the microstructures of Thermo-Vacuum-PVD revealed high levels of edge to face orientation in the vertically dominated smear zone, followed by Thermo-PVD, Vacuum-PVD, and PVD only. Moreover, the microstructures of specimens in the horizontally dominated outside of smear zone exhibited mainly face to face orientation and progressively mixed with edge to face orientation. The increasing intensities of edge to face microstructures were successfully correlated with increasing flow parameters and measured shear strengths corresponding to the increasing levels of improvement.
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Compression load tests on bored and barrette piles founded in gravelly sediments
(2021-04-01)
Lin, San Shyan
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Chaiyaput, Salisa
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Lai, Chia Hung
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Chen, Wei Ning
Compressive tests on piles socketed in gravelly sediments were conducted. Six bored piles and four barrette piles, with or without base grouting, were studied using back-analysis. A spline function was used to fit the measured data for pile load along the depth. Using the fitted spline function and assuming that behaviour at the pile-soil interface is hyperbolic, back-analysis was used to determine the model parameters by calibrating the design value of β (the product of the coefficient of horizontal soil stress and the value of the tangent of the effective angle of shearing resistance of the soil-shaft interface) and comparing the results of back-analysis and the measured data. The results of this comparison revealed that the results of back-analysis were sensitive to the measured data. A back-calculated β value that is, in general, larger than that found by current methods was obtained.
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Evaluation of Interface Shear Strength Coefficient of Alternative Geogrid Made from Para Rubber Sheet
(2023-04-01)
Liangsunthonsit, Anubud
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Jaroonrat, Pakkapon
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Ayawanna, Jiratchaya
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Naebpetch, Weerawut
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Chaiyaput, Salisa
In this work, elastic natural rubber compound sheet (RCS) and ribbed smoked sheet grade 3 (RSS) were studied as alternative replacements for polymer geogrid for soil reinforcement. In order to investigate the reinforcing effectiveness in three distinct environments using the interface shear strength coefficient (R<inf>in</inf>) by the large-scale direct shear test, the RSS and RCS geogrids were installed independently in sand, lateritic soil, and clay. Using either an RSS geogrid or RCS geogrid, the average R<inf>in</inf> is progressively smaller in reinforced sand, lateritic soil, and clay, respectively. Higher tensile strength of reinforced materials using the RCS geogrid than those using the RSS geogrid is encouraged by the better elastic characteristics of the RCS geogrid. Thus, utilizing the RCS geogrid-reinforced materials can better increase the shear strength of coarse-grained soil such as sand and gravel.

Chaiyaput, Salisa

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