Shengyi Cong’s research while affiliated with Harbin Institute of Technology and other places

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Publications (39)


Effect of Freeze–Thaw Cycles on the Microstructure Characteristics of Unsaturated Expansive Soil
  • Article
  • Full-text available

January 2025

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17 Reads

Sustainability

Xinyu Li

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Shengyi Cong

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Liang Tang

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Xianzhang Ling

The term “engineering cancer” refers to expansive soil, whose properties threaten the stability and safety of structures. As a result, appropriate steps must be taken to guarantee the sustainable development of buildings. To explore the impact of freeze–thaw cycles (FTCs) on the microscopic characteristics of unsaturated expansive soil in the cold region, the mineralogical composition and microstructure were analyzed using X-ray diffraction (XRD), thermogravimetric analysis, and scanning electron microscopy (SEM). The influence of repeated FTCs on the characteristics of particle morphology and pore structure in expansive soil was quantitatively examined. The findings indicate that, in comparison to other expansive soil samples, the Yanji expansive soil is particularly susceptible to failures due to its high sand content and low liquid limit. The FTCs significantly alter the microstructure, leading to increased complexity in the particle edge shapes, a transition in particle distribution from dispersed to more concentrated, a reduction in larger particles, and a more intricate spatial arrangement of particles. As moisture content rises, the impact of FTCs becomes increasingly pronounced. The particle distribution’s area probability index and fractal dimension are identified as medium-variability parameters, with a high-variation coefficient before the 3rd FTC, which then gradually decreases. The repeated FTCs result in particle breakage and agglomeration, causing the particle size to become more uniform and the soil’s microstructure to stabilize after 3–5 FTCs. These findings contribute to understanding the FTC behavior of expansive soils, provide theoretical support and scientific guidance for disaster prevention and control measures, as well as for the sustainable development of engineering projects involving expansive soil sites.

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Rainfall or snowmelt infiltration induces (a) the failure of slope protection; (b) collapse of expansive soil slope; and (c) tensile cracks of slope protection at the Binxi station during the construction of high-speed railway.
Rainfall and snowfall between 2015 and 2016 at the study area.
Variation in the meteorological factors in the test area: (a) temperature and cumulative radiation; (b) air pressure and evaporation.
Field installation of inclinometer casing and temperature sensors: (a) drilling hole; (b) installation of inclinometer casing; and (c) installation of temperature sensor.
Overview of the monitoring site at Binxi section along the Harbin–Jiamusi high-speed railway: (a) monitoring locations; (b) cross section view of the monitoring slope.

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Insights into the shallow landslide mechanism of expansive soil slope induced by freeze–thaw cycles and snowmelt infiltration

September 2024

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90 Reads

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1 Citation

For rigorous understanding the shallow landslide mechanisms and deformation characteristics of expansive soil slopes, a comprehensive in-situ monitoring platform is established. Triaxial creep tests and microstructure analysis with scanning electron microscopy are also conducted on expansive soil samples obtained from Binxi station. Field monitoring data indicates that freeze–thaw (F–T) cycle and snowmelt infiltration significantly increase the creep deformation of expansive soil slope during spring melting period. Due to the influence of F–T cycle and snowmelt infiltration, more soil grains are involved in the shear deformation contributing to a large, localized shearing. Additionally, the microstructural analysis shows that F–T cycle influences the relationship between expansive soil grains that gradually change from face–face contact to point–face contact or edge–edge contact form. The shallow landslide mechanisms of expansive soil slope are revealed from creep deformation and microstructure characteristics of soils after the F–T cycle and snowmelt infiltration, which can be summarized into two stages, namely, the snowfall accumulation state and snow melt-shallow infiltration stage. These results can serve as a good reference for the prevention of expansive soil slopes in seasonally frozen regions.







Numerical study of ice loads on different interfaces based on cohesive element formulation

September 2023

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145 Reads

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4 Citations

With the increase of marine activities in the Arctic area, the demand for reliable design of marine structures is growing. Numerous publications can be found regarding simulations of ice action on structures using cohesive element models of the ice. However, previous studies have rarely discussed the influence of structural form, that is, the form of ice-structure interaction interface, on the ice load. Thus, a more comprehensive understanding of the ice load on structures with different interface geometries needs to be explored. In the present paper, three-dimensional finite element models with the cohesive element method are developed to investigate the ice load on different structures. The numerical results are validated based on in-situ testing data and the results of the previous numerical model. Parametric studies considering structure widths, inclination angles, ice velocity as well as structure roughness are conducted to explore the horizontal force and failure process of the ice sheet. The process of ice-structure interaction and ice loads on different structural forms were discussed and simplified diagrams of ice load distribution on the interface were developed.


Frost Heave Performance of Shallow Foundations for Overhead Transmission Lines in Seasonally Frozen Alpine Regions

September 2023

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19 Reads

Journal of Cold Regions Engineering

The Lanolin 750 kV electrical transmission line traverses more than 102.86 km through seasonally frozen regions, causing many engineering problems for transmission tower foundations. In this work, physical models of reinforced concrete independent foundations in soils with different frost heave grades were used to simulate the frost heaving performance in seasonally frozen alpine regions. The test results were used to evaluate the tangential frost heaving force calculated based on different specifications. The results showed that the tangential frost heaving force and frozen depth increased with the temperature decrease. Moderately frost-susceptible soils also increased the tangential frost heaving force and frozen depth. Based on technical standards, the main differences between the calculated and the test values were the variable load component and effective frozen depth coefficients. Correcting the coefficient values resulted in a closer agreement between the test and the calculation results.



Citations (28)


... On the other hand, the estimation of ductility reduction factors has been obtained via deterministic approaches. Furthermore, recent studies developed for reinforced concrete structures discuss the importance that any numerical or code model must be affected by uncertainties in the seismic response [29][30][31][32], or in order to compute seismic fragility or collapse of structures [24,33,34]In addition, it is necessary to estimate strength reduction factors toward reliability-based seismic design as suggested in previous works [35][36][37][38] for buildings, bridges and different types of structures. For this reason, this work is aimed to compute ductility reduction factors determined through UAFR spectra to consider structural reliability in seismic designs for ground motion records representative of stiff and soft soil of Mexico City. ...

Reference:

Reliability-based ductility reduction factors surfaces using the generalized Bojorquez ground motion intensity measure I
Development of fragility surfaces for pile-supported structures under mainshock-aftershock sequences
  • Citing Article
  • February 2024

Results in Engineering

... Many governmental authorities are making strong provisions for seismic analysis of the structure to decrease the casualties due to such disasters. Ghosh (2018, 2019), Maleki and Nabizadeh (2021), Zhang and Yang (2021), Nouzari et al. (2021), Kumar and Chatterjee (2021), Rahaman and Kumar (2022) and Maleki and Hosseini (2022), Maleki et al. (2023), Man et al. (2023), Chatterjee (2024, 2024b) have performed seismic analysis of various structures however the methodologies used by them were different. Subba Rao (2005, 2006), Ghosh (2018, 2019), and Nouzari et al. (2021) performed seismic stability analysis of the shallow strip footing by pseudo-static approach. ...

Seismic response and failure modes analysis of pile foundations in liquefiable soils using various design criteria
  • Citing Article
  • November 2023

Soil Dynamics and Earthquake Engineering

... The addition of graphene oxide also effectively reduced the resistivity of cement composites, thereby improving their electrical conductivity. For example, the resistivity of concrete decreased by 20% with the addition of 0.025% to 0.1% graphene oxide [131]. Moreover, the combination of graphene oxide with carbon fibers significantly reduced the interconnectivity of the pore system, leading to higher resistivity and further enhancing the electrical performance of the composite [9,13]. ...

Analyzing the macroscopic/mesoscopic mechanical properties and fatigue damage of graphene oxide/microcapsule self-healing concrete
  • Citing Article
  • October 2023

Journal of Building Engineering

... The increasing activities in the Arctic and sub-Arctic regions for resource extraction and shipping routes, particularly the rapid deployment of wind turbines in ice-covered regions, underscore the growing importance of ice mechanics research. Recent extensive studies in this field (e.g., [1][2][3][4]) highlight the urgency, yet there remain significant challenges in designing marine structures to withstand ice loads. Experimental methods, while accurate, are often prohibitively expensive and time-consuming. ...

Numerical study of ice loads on different interfaces based on cohesive element formulation

... When W/C rises from 0.3 to 0.5, compressive strength and bending strength decrease significantly, indicating that the higher the W/C, the lower the strength [65]. Other researchers have similar results, such as Cong et al. [72], and when the content of GO is 0.1 wt% and the water-cement ratio is 0.5, GO has the best strengthening effect on cement-based materials. ...

Fatigue properties and microstructure of graphene oxide/microcapsule self-healing concrete
  • Citing Article
  • March 2023

Journal of Building Engineering

... Considering soil deformation and its effect on soil hydrothermal properties could effectively improve the simulation of soil water-heat-salt migration (Liu et al. 2023b). Meanwhile, groundwater has a non-negligible effect on soil frost heave (Cong et al. 2023;Jiang et al. 2022b). Guo et al. (2018) thought groundwater might increase water flow in the frozen area under freeze-thaw conditions, thereby increasing frost heave. ...

Experimental and Numerical Investigations of Frost Heave Characteristics of a Transmission Tower Foundation along the Lanzhou–Lintao Power Transmission Line
  • Citing Article
  • March 2023

International Journal of Geomechanics

... The growth of frost layer will lead to the increase of temperature on the surface of frost layer, which will lead to the melting of frost on the surface and form a complex frost layer structure. Frosting exists everywhere in our life, which affects our daily life, [1] such as fan blades [2], the surface of high-voltage transmission lines [3], the most common is the frost of the air conditioning unit [4], which will increase the thermal resistance of the heat exchanger [5,6] and cause serious safety problems [7]. To address the problem of frost, numerous scholars both domestically and internationally have conducted extensive research on frost suppression methods. ...

Frost heave performance of a foundation at an overhead transmission line in the alpine seasonal frozen regions
  • Citing Article
  • February 2023

SOILS AND FOUNDATIONS

... Consequently, "engineering cancer" is another name for this [3]. However, expansive soil is widely distributed in China and abroad, mainly in Yunnan, Guangxi, Guizhou, Hubei, and other provinces in China, as well as in southeast Africa and southeast Asia [4][5][6][7][8][9][10]. In recent years, engineering practice has found that large-scale expansive soil sites frequently occur in seasonal frozen soil areas such as Jilin, Liaoning, and Heilongjiang, and this has an important impact on engineering construction and the prevention of damage caused by freezing [11][12][13][14]. ...

Prediction of compressive creep behaviors of expansive soil exposed to freeze-thaw cycle using a disturbed state concept-based model
  • Citing Article
  • August 2022

Cold Regions Science and Technology

... In contrast, this study observed a 15% increase in strength after 10 days of curing, which could be attributed to the shorter curing period and the fact that in Shafiei et al. 72 study, the bacteria percentage in specimens was 100%, much higher than in this study. Cong et al. 35 found that hypothesized to be due to increased salt content inhibiting urease activity and weakening the MICP reaction. When the salt content is at its highest, the crystallized salts precipitated in the soil fill the voids between particles, reducing compressibility. ...

Stabilization of coarse-grained saline soil using microbially enhanced calcium carbonate deposition
  • Citing Article
  • September 2022

Bulletin of Engineering Geology and the Environment

... The increasing depth of open-pit mining and the height of the slope engineering relative to dams and roads cause the safety and security of slope structures to be compromised, resulting in slope stability becoming critical to the long-term safe operation of rock engineering. Landslides predominantly arise from the following two aspects [3]: the external force, which could break the initial stress equilibrium of the geologic body and may cause slope collapse or sliding [4][5][6]; the other is the changes in geologic properties that cause the shear strength of geologic body to decrease [7][8][9][10][11]. Slip disasters can have substantial consequences, such as the blockage of roadways, the interruption of traffic flow, and structural collapse [12][13][14]. ...

Bearing Properties and Stability Analysis of the Slope Protection Framework Using Recycled Railway Sleepers

Sustainability