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RISS 인기검색어
- 검색키워드
- 저자 : Haoyang Peng (검색결과 3 건)
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A 3D Thermal Field Restructuring Method for Concrete Dams Based on Real-Time Temperature Monitoring
Peng Lin,Haoyang Peng,Qixiang Fan,Yunfei Xiang,Zongli Yang,Ning Yang 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.4
Temperature monitoring and control is of great significance to ensure concrete quality during the construction of dam concrete. In this study, a 3D thermal field restructuring method is developed for the complex evolution process of thermal field in dam concrete during construction, based on real-time temperature monitoring. The proposed method is related to the ordinary Kriging interpolation and the distributed optical fiber temperature sensing (DTS) technology. Based on the temperature monitoring of the Wudongde (WDD) super-high arch dam, the 3D thermal field can be acquired effectively and fast by the proposed restructuring method. The results indicate the temperature difference between the temperature measured by thermometers and the restructured temperature is within 1°C. The evolution process of the restructured 3D thermal field for the WDD arch dam is in good agreement with the site situation. In addition, the uncertainty, cons and pros of the proposed method and the optimal layout of temperature sensors are further discussed. Although the proposed thermal field restructuring method has some limitations, it is believed to be a valuable tool for acquiring the 3D thermal field and thermal gradient of dam concrete.
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Chi Liu,Xiaoli Liu,Chunlu Wu,Enzhi Wang,Sijing Wang,Haoyang Peng 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.3
The mechanical properties and failure mechanisms of geomaterials are greatly affected by their heterogeneity. As a special complex rock medium, the mechanical response of red bed soft rock is of considerable importance in stability analyses and the protection of slopes. In this study, X-ray micro-computerized tomography (micro-CT) was used to obtain the spatial distribution of minerals in red bed soft rock. An image processing procedure was proposed to incorporate the extracted mesoscopic mineral and crack distribution into the model of the grain-based finite-discrete element method (GB-FDEM). Subsequently, a uniaxial compression test and Brazilian disc splitting test were performed to obtain the mechanical response and failure modes of mudstone. The microscopic fracture morphology and traces of intragranular and intergranular cracks under tensile and shear stress were analyzed in detail. The numerical results show that the GB-FDEM model successfully characterized the mechanical response, which was similar to that of the laboratory tests and the traditional homogeneous models. The presence of minerals and pre-existing cracks disturbed the stress distribution in the heterogeneous model, which resulted in a difference in local stress that reasonably explained the phenomenon of local fragmentation. The simulated macroscopic failure mode of the heterogeneous models was most consistent with the results of the laboratory tests. The systematic framework proposed in this study provides a powerful tool for further understanding the multiscale (micro, meso, and macro) failure mechanism of red bed soft rock and predicting a realistic fracture process while reducing the tedious and redundant laboratory tests.
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Developmental Stages of Akebia trifoliata Fruit Based on Volume
Hao Yang,Wei Chen,Peng Fu,Shengfu Zhong,Ju Guan,Peigao Luo 한국원예학회 2021 원예과학기술지 Vol.39 No.6
Akebia trifoliata, commonly named augmelon (means August plus melon), has been domesticating as a new artificial cultivation fruit crop in China for several years. Generally, field management measurements are severely dependent on the development dynamic of harvest organs, and therefore the study of fruit development stage of A. trifoliata is urgent in production. In this study, four cloned lines with various spindle, nephroid, pyriform and Banana-like shapes, were selected to observe fruit developmental parameters, including volume, weight, length and width from pollination to maturity. Volume rather than length or width, which can minimize the influence of fruit shape on growth stage, was finally employed as a primary parameter for dividing developmental stages. Then a Logistic model of volume growth was established according to the data of pyriform fruit, and the other three fruits were employed to the suitability of this mathematical model. The resulted showed that the growth curve of augmelon appeared typical double sigmoid shape for all four shapes fruits. Based on four inflection points of volume growth curve, the fruit development of augmelon was classified five developmental stages in the order: fast stretch (FS) stage lasting for 48 days, shape stabilization (SS) stage lasting for 30 days, tardy expansion (TE) stage lasting for 51 days, suspended expansion (SE) stage lasting for 21 days and fast expansion (FE) stage lasting for 30 days. Comprehensively, volume was an ideal growth parameter for dividing fruit developmental stage of augmelon, and five-stage growth model could be applied as reference for both gardener and scientist to refer to the fruit growth status.
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