首页期刊导航|KSCE journal of civil engineering
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KSCE journal of civil engineering
Korean Society of Civil Engineers
KSCE journal of civil engineering

Korean Society of Civil Engineers

双月刊

1226-7988

KSCE journal of civil engineering/Journal KSCE journal of civil engineeringEISCI
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    Carbon Emission Optimization for Assembled Buildings Using Interval Grey GERT Modelling and Modify NSGA-Ⅲ Algorithm in China

    Hong SongXiaoxiao ChenHeping Wang
    5415-5426页
    查看更多>>摘要：Developing prefabricated buildings is an effective means to reduce carbon emissions in the construction industry. Currently, research on project management of prefabricated buildings mainly focuses on multi-objective optimization of construction period cost quality issues, with little consideration given to the important environmental factor of carbon emissions. In this article, we propose a comprehensive optimization objective involving the carbon emissions, duration, cost and quality level of projects. Then, an interval grey GERT network is used to establish a multi-objective joint optimization model for the green construction of assembled buildings, and the modelling problem is solved with the modified NSGA-Ⅲ algorithm based on a local search approach with sparsity. Taking the affordable housing project on the north side of Shangfang in Nanjing as an example, compared with the original contract, it is shown that the improved NSGA-III algorithm can shorten the total construction period by 17.52%, reduce the total cost by 15.24%, increase the total quality level by 8.89%, and reduce carbon emissions by 33.64%. The establishment of a multi-objective joint optimization model and its solving algorithm for green construction in prefabricated building projects provides more specific guidance for green construction in uncertain environments.
      原文链接:
    • NETL
    • NSTL
    • Korean Society Of Civil Engineers-Ksce

    A Novel Performance Measurement of Innovation and R&D Projects for Driving Digital Transformation in Construction Using Ordinal Priority Approach

    Mahsa SadeghiAmin MahmoudiXiaopeng DengMin Luo...
    5427-5440页
    查看更多>>摘要："The COVID-19 pandemic" and "digital transformation" are prevailing mega-trends of volatile, uncertain, complex, and ambiguous world. Pandemic made organizations to employ strategies for "surviving, resilience, and thriving" for different periods. Digital transformation motivates organizations to grasp disruptive opportunities by conducting innovation, R&D projects. This study addresses "Which innovation and R&D projects can drive digital transformation in a construction organization, and meet its organizational criteria for survival, resilience, and thrivingV The significant issue with evaluating R&D projects is the lack of "quantitative data." The current study proposes a novel performance measurement framework based on the Ordinal Priority Approach (OPA), which considers decision-makers' preferences as "ordinal data." The proposed model considers various degrees of importance for periods during performance measurement, handles any number of criteria and decision-making units (DMUs), while Data Envelopment Analysis (DEA) has some limitations regarding the number of DMUs compared to the number of criteria, Moreover, proposed OPA-based framework receives positive and negative criteria without the need of transforming the data. Comparing OPA and Ordinal Data Envelopment Analysis (DEA) through a pilot experiment shows that the OPA-based framework is straightforward to use, with more reliable outputs.
      原文链接:
    • NETL
    • NSTL
    • Korean Society Of Civil Engineers-Ksce

    Numerical Simulation Study on Optimization of Freezing Pipe Position under Seepage Conditions Based on Simulated Annealing Algorithm

    Renjie Song
    5441-5451页
    查看更多>>摘要：Artificial Ground Freezing (AGF) is a promising method for controlling seepage in permeable strata. However, AGF faces challenges, including difficulties in achieving a frozen barrier in high-flow conditions and concerns about cost-effectiveness. This study optimizes freezing pipe placement in AGF using a simulated annealing algorithm and a coupled hydrothermal finite element model, focusing on AGF system responses under varying seepage velocities. The optimized layout significantly reduces freeze-ring formation time (by 2.5 days) and the overall freezing duration (by 12.5 days). Moreover, it substantially decreases the required frozen soil volume, facilitating drilling and excavation. Across different seepage velocities, the difference in freeze-ring formation time between the optimized and uniform layouts gradually increases with higher seepage velocity, reaching a maximum difference of 5.9 days. Finally, the relationship between freezing time and seepage velocity was quantitatively described using exponential functions. This study underscores the critical role of optimizing freezing pipe placement in AGF, providing a foundation for efficient and cost-effective geotechnical engineering practices.
      原文链接:
    • NETL
    • NSTL
    • Korean Society Of Civil Engineers-Ksce

    Performance Evaluation of Sieve and Curtain Pluviators for Reconstituted Sand Specimen in Model Box

    Kil-Wan KoSung-Bok LeeTae-Sic OhNam-Ryong Kim...
    5452-5463页
    查看更多>>摘要：Reconstitution of the soil model is a basic step of physical modeling. Sand pluviation has been introduced as an effective way to prepare the soil specimen. However, it is difficult to create a model within the rigid soil container at a target soil density while ensuring the homogeneity of the entire soil model. To evaluate the spatial variability inside the container when the specimen was created using the pluviation method, a series of performance tests was conducted. In this study, two pluviation methods, sieve and curtain pluviations, were selected and examined in aspects of the target relative density of soil and its spatial variation. A bespoke sieve and commercially available curtain pluviators were employed. Each method was investigated by varying the test parameters, pouring mass rate, drop height, and sweep rate. Moreover, nine samples in a model box were used to evaluate the two-dimensional spatial variation of the relative density. Test results showed that the relative density increased with the drop height and sweep rate, but decreased with the pouring mass rate. Furthermore, the spatial variability reduced as the relative density increased. It was also observed that the curtain pluviator was more effective than the sieve pluviator in reducing spatial variability, with the exception of the high variability of soil density near the boundary wall of the box.
      原文链接:
    • NETL
    • NSTL
    • Korean Society Of Civil Engineers-Ksce

    Re-evaluation of One-Dimensional Site Response Methods Using versus Adjusted Borehole Arrays

    Pei-Hsien KuanChi-Chin TsaiDuhee Park
    5464-5470页
    查看更多>>摘要：Site response analyses are crucial for estimating local effects on ground shaking during earthquakes. However, recent investigations utilizing KiK-net borehole array data have revealed a consistent underprediction of high-frequency ground motion by both equivalent linear and fully nonlinear methods, contrary to expectations. This study reassess the accuracy of 1D site response analysis methods, including equivalent linear, frequency-dependent equivalent linear model, and nonlinear analysis, by integrating depth-dependent stiffness and adjusted shear wave velocity. Nine instrumented vertical arrays, featuring a total of 132 recorded ground motions, are subjected to analysis. For the sites and ground motions considered, the results indicate that the nonlinear method performs without significant bias, whereas the equivalent linear and frequency-dependent equivalent linear methods tend to respectively underestimate and overestimate high-frequency results. To enhance accuracy, it is recommended to incorporate depth-dependent stiffness and adjusted shear wave velocity when predicting high-frequency ground motion in site response analyses.
      原文链接:
    • NETL
    • NSTL
    • Korean Society Of Civil Engineers-Ksce

    Pullout Capacity of Piles in Unsaturated High Plasticity Clayey Soil: An Experimental Model Study

    Amees MushtaqMajid Hussain
    5471-5479页
    查看更多>>摘要：Unsaturated soils exhibit distinct physical and mechanical characteristics compared to dry or saturated soils. Ignoring the influence of unsaturation (matric suction) and assuming either dry or saturated conditions can lead to unreliable predictions of pile behavior in unsaturated soils. In this study, the pullout capacity of different physical model piles driven in unsaturated Kaolinite-Bentonite matrices is investigated. A series of lab-scale pullout tests were carried out to examine the influence of matric suction, pile type, pile L/D ratio, and undrained cohesion (c_u) of soil on the ultimate pullout capacity of model piles. Soil samples were prepared and compacted in a tank, and holes were created using a pile. Four model piles (solid and hollow stainless steel) were driven into the holes, ensuring proper spacing. Incremental loading was applied until the piles slipped out, with displacement measured by an LVDT. The pile pullout capacity increased with increased matric suction and undrained cohesion. The uplift capacity increased by 50% to 136% as matric suction increased by 157.97% as the compaction state was changed from 0.95γ_(d(max)) on the wet side of optimum moisture content (OMC) to 0.95γ_(d(max)) on the dry side of OMC of the compaction curve. However, for the compaction state of 0.90γ_(d(max)), the matric suction increased by 398.80%, leading to a 275% to 800 % increase in the uplift capacity. As the cohesion of the five samples increased from 17.84 kPa to 137.84 kPa, the uplift capacity of all the model piles increased. In Kaolinite-Bentonite mixes compacted on the dry side of OMC, hollow model piles resisted higher pull-out loads than solid model piles. The increase in uplift capacity was found to be in the range of 11.11% to 75% for different combinations of pile type and compaction density (matric suction). The results from the study imply a strong influence of matric suction, undrained cohesion, L/D ratio, and pile type on pullout capacity for piles driven in unsaturated Kaolinite-Bentonite mix.
      原文链接:
    • NETL
    • NSTL
    • Korean Society Of Civil Engineers-Ksce

    Experimental Study on Anisotropic Deformation Behavior and Microstructure Evolution of Red-Bed Mudstone

    Zhishen WangJiaotao SongEnxi QiuZhuang Peng...
    5480-5499页
    查看更多>>摘要：A detailed exploration about the development of the microscopic behavior of red-bed mudstones and exploration of their anisotropic deformation mechanisms in-depth can help to optimize the improvement of red-bed subgrade. To discuss the effects of single immersion and dynamic wetting-drying cycles, the Aramis system was used to monitor the mudstone deformation, whose results were compared with results of conventional deformation tests; the patterns of moisture migration was analyzed. Variations in mineral compositions, particle orientation and pore characteristics during cycles were investigated. The results show that after encountering water, red-bed mudstones swelled in axial and shrank in radial; the swelling first started around the initial fissures. During wetting-drying cycles, the decrease of equivalent montmorillonite content leads to the weakening of water absorption capacity and deformation capacity of the red-bed mudstone from the sixth wetting-drying cycle; moisture migration causes a directional shift of mudstone particles towards the direction of moisture migration, which triggers anisotropy of the red-bed mudstone deformation; moreover, wetting-drying cycles lead to the increase of pores and fissures inside the red-bed mudstone, with a more complex morphology and the increase of scattered detrital particles, which are the main reasons for the continuous deformation of the red-bed mudstone.
      原文链接:
    • NETL
    • NSTL
    • Korean Society Of Civil Engineers-Ksce

    Analysis of the Active Earth Pressure of Sandy Soil under the Translational Failure Mode of Rigid Retaining Walls Near Slopes

    Lianheng ZhaoZheng ZhongBiao ZhaoZhonglin Zeng...
    5500-5515页
    查看更多>>摘要：To accurately obtain the active earth pressure of a limited-width sandy fill behind a rigid retaining wall under translational failure, finite element limit analysis (FELA) was used to simulate the failure mechanism of the limited-width sandy fill behind the wall under the translational failure mode of the rigid retaining wall. Based on the different development characteristics of the sliding surface, three kinds of failure mode characteristics were identified. Semianalytical expressions of the active earth pressure were obtained by using the limit equilibrium method and the finite difference method, introducing the horizontal differential element and considering the soil arching effect behind the wall. The parameter analysis shows that the width-to-height ratio of the fill and the slope angle play a controlling role in the failure mode and that the position of the resultant force corresponding to the active earth pressure under different failure modes also changes significantly. The active earth pressure exerted on the retaining wall is maximized at a particular threshold of the friction angle at the wall-fill interface, which varies according to the geometric shape of the backfill and its internal friction angle.
      原文链接:
    • NETL
    • NSTL
    • Korean Society Of Civil Engineers-Ksce

    The Influence of Pile Shaft Distributed Grouting on the Horizontal Load Response of Rectangular Piles

    Wenshuai LiWen YuanQiyu TaoWeiming Gong...
    5516-5523页
    查看更多>>摘要：In-situ lateral load tests were conducted on rectangular piles in gravelly soil before and after grouting to investigate the impact of combined side and end grouting on lateral bearing capacity and the failure mode of pile-soil interaction. The results indicate that this combined grouting technique significantly enhanced the lateral bearing capacity of the pile, achieving a 30% increase compared to before grouting. After grouting, the bonding state between the pile and the soil improved, resulting in the formation of tension-shear cracks within the soil on the side of the pile under lateral load. The load-displacement curve of the rectangular pile exhibited nonlinearity, with the deflection deformation showing the load characteristics of an elastic long pile. The bilinear model can accurately assess the actual bearing capacity of the rectangular pile. Comparing the theoretical model predictions with the experimental data, the prediction errors were -3.5% and 1.8% before and after grouting, respectively.
      原文链接:
    • NETL
    • NSTL
    • Korean Society Of Civil Engineers-Ksce

    Influence of Load Eccentricity on Performance and Contact Pressures of Ring Foundations on Geogrid-Reinforced Sand

    Masoud Rezazadeh AnbaraniSaeed AbrishamiMeysam Bayat
    5524-5533页
    查看更多>>摘要：Eccentric loads applied on ring foundations affect their performance and contact pressure distribution. Nevertheless, reinforcing soils is a passive technique to improve their behavior. The present paper has evaluated the influence of load eccentricity on the behavior and contact pressures of a model ring foundation resting on geogrid-reinforced, very dense sand. Ten tests were carried out in unreinforced and reinforced conditions to this aim. The findings show that an increase in load eccentricity leads to decreasing bearing capacity due to the tilt of the foundation, so that increasing eccentricity ratio to 1/4 led to a substantial reduction of approximately 50% in bearing capacity ratio, and detachment of foundation from the soil surface in its side opposite to load eccentricity. However, reinforcing sand beneath the ring foundation under eccentric loading significantly decreases its differential settlements and improves the load-settlement and load-tilt behavior. The present experimental results are consistent with the analytical method. Moreover, the observations show that the performance of ring foundations under eccentric loading has been improved significantly by reinforcing very dense sand. Contact pressure distribution of the ring foundation tends to change from a saddle shape to a parabolic form due to increased eccentricity. Furthermore, reinforcing sand beneath the foundation leads to the prevention of its detachment from the soil surface.
      原文链接:
    • NETL
    • NSTL
    • Korean Society Of Civil Engineers-Ksce