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Study on frost durability of fibre porous concrete
ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3104
Jie Zhang, Peijiang Cong, Zibo Ji, Guiyu Peng, Gaowei Liu, Guangyuan Xu, Yanchun Li
{"title":"Study on frost durability of fibre porous concrete","authors":"Jie Zhang,&nbsp;Peijiang Cong,&nbsp;Zibo Ji,&nbsp;Guiyu Peng,&nbsp;Gaowei Liu,&nbsp;Guangyuan Xu,&nbsp;Yanchun Li","doi":"10.1002/cepa.3104","DOIUrl":"https://doi.org/10.1002/cepa.3104","url":null,"abstract":"<p>Porous concrete is widely used in drainage engineering, but it is easily affected by freezing injury in cold areas. Low strength and poor frost resistance are the main obstacles to its wide application. In this study, the influence of fiber on frost resistance and durability of porous concrete is deeply discussed, aiming at finding the best fiber admixture to improve its stability and durability in engineering application in cold areas. By preparing ordinary porous concrete and two kinds of porous concrete with different fiber content, and carrying out rapid freeze-thaw cycle tests, combined with the indexes such as mass loss rate, relative dynamic elastic modulus and compressive strength loss rate, the influence of different fiber content on the frost resistance of porous concrete is comprehensively evaluated. The addition of polypropylene fiber (0.05%) can effectively improve the frost resistance of porous concrete and prolong its service life, so it is an ideal material for engineering application in cold areas. The research results provide an important reference for subsequent projects and help to promote the wide application of porous concrete in cold areas.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"92-100"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thrust force requirement prediction using HOA-XGBoost for TBM tunneling in squeezing ground
ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3230
Rongwen Chen, MingFu Zheng, Fulin Li, Yin Bo, Bin Zhang, Ying Zhang, Jun Xiong
{"title":"Thrust force requirement prediction using HOA-XGBoost for TBM tunneling in squeezing ground","authors":"Rongwen Chen,&nbsp;MingFu Zheng,&nbsp;Fulin Li,&nbsp;Yin Bo,&nbsp;Bin Zhang,&nbsp;Ying Zhang,&nbsp;Jun Xiong","doi":"10.1002/cepa.3230","DOIUrl":"https://doi.org/10.1002/cepa.3230","url":null,"abstract":"<p>Tunnel Boring Machine (TBM) has been widely used in deep and long tunnels due to its highly efficient advantage. However, TBM can be subject to adverse geology, especially the soft and weak ground, so the TBM jamming, which seriously affects the construction schedule, could happen. Thrust force requirement evaluation avoiding TBM jamming is therefore important for TBM tunnel construction at the early stage or machine designing phase. In this research, some intelligent machine learning models are constructed to conveniently assess the enough thrust force based on the thousands of numerical simulations and existing nomograms. And the detailed model performance comparisons are carried out and concluded that XGBoost model outperforms the random forest (RF), multiple of linear regression (MLR), general regression neural network (GRNN), and support vector regression (SVR) models. Furthermore, the expression coefficient in MLR can reveal the relationship between the input variables and output. For further improving the XGBoost's accuracy, the hiking optimization algorithm (HOA), sparrow search algorithm (SSA), and northern goshawk optimization (NGO) are adopted here and used to adjust XGBoost's hyperparameter combination, the HOA-XGBoost (MAE=0.0191, RMSE=0.0232, R2=0.9853 in the testing set) is finally the most precise model and also behaves the most stable and robust among all the built models through the 5-fold cross-validation processes.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1439-1447"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the Optimization Model for Dynamic Earthwork Deployment of Pumped Storage Power Stations
ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3218
Ang Li, Yuan Li, Jiageng Chen, Zhiguo Ma, Yupeng Zhang
{"title":"Study on the Optimization Model for Dynamic Earthwork Deployment of Pumped Storage Power Stations","authors":"Ang Li,&nbsp;Yuan Li,&nbsp;Jiageng Chen,&nbsp;Zhiguo Ma,&nbsp;Yupeng Zhang","doi":"10.1002/cepa.3218","DOIUrl":"https://doi.org/10.1002/cepa.3218","url":null,"abstract":"<p>In recent years, the dynamic earthwork deployment has received significant consideration as a crucial component in the construction of pumped storage power stations. Considering the dynamic change process of construction progress over time, this study coordinates the relationship between various construction elements and discusses the impact of key constraints to earthwork deployment based on the relevant engineering background. Then, with the planning principle in operation research, an optimization model is proposed for dynamic earthwork deployment, and applied to engineering examples. The results of the study show that the model improves the direct utilization rate of excavated materials to a certain extent, reduces the cost of the project and provides an effective method for the fine control of earthwork in the construction process of pumped storage power stations.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1313-1321"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanism of Overbreak and Underbreak Induced by Tunnel Blasting and Control Methods
ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3237
Dongkui Qu, Qinghua Xiao, Yin Pan, Xiaoyong He, Jian Wu, Yuhui Fan, Xiaochun Yang
{"title":"Mechanism of Overbreak and Underbreak Induced by Tunnel Blasting and Control Methods","authors":"Dongkui Qu,&nbsp;Qinghua Xiao,&nbsp;Yin Pan,&nbsp;Xiaoyong He,&nbsp;Jian Wu,&nbsp;Yuhui Fan,&nbsp;Xiaochun Yang","doi":"10.1002/cepa.3237","DOIUrl":"https://doi.org/10.1002/cepa.3237","url":null,"abstract":"<p>Controlling overbreak and underbreak during tunnel blasting is a critical challenge, as it directly impacts excavation quality and safety. This study provides an in-depth analysis of the effects of surrounding rock geology, cross-section specifications, and construction conditions on overbreak and underbreak. The mechanisms underlying blasting-induced overbreak and underbreak are elucidated, revealing that conventional methods—such as controlling drilling angles and ensuring appropriate charge spacing—remain limited, particularly for long advances. To address these limitations, this study introduces a geometric control method employing both long and short holes, with derived theoretical formulas. Case study validations demonstrate that this computerized control method can swiftly determine critical parameters such as collar positions, drilling angles, and hole lengths, offering precise theoretical guidance for on-site drilling operations. The proposed method has shown significant effectiveness in controlling over-break and underbreak.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1522-1532"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Considerations of underground factory excavation and temperature stress on rock bolt crane beam
ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3212
Haoming Zhang, Chao Su
{"title":"Considerations of underground factory excavation and temperature stress on rock bolt crane beam","authors":"Haoming Zhang,&nbsp;Chao Su","doi":"10.1002/cepa.3212","DOIUrl":"https://doi.org/10.1002/cepa.3212","url":null,"abstract":"<p>The cracks in rock bolt crane beams are mainly caused by stress release during excavation of surrounding rock and temperature stress during concrete pouring. Based on three-dimensional nonlinear finite element theory, the stress distribution of rock bolt crane beam during excavation of underground powerhouses and the temperature stress field under the use of cooling water pipes and surface insulation are simulated separately, and the impact of both on the crack resistance safety of rock bolt crane beam is comprehensively considered.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1244-1251"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on Construction Control Technology of Concrete Beam Cable-Stayed Bridges Considering Coupling Deformations
ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3207
Laifa Wang, Yexun Li, Ziao Liu
{"title":"Research on Construction Control Technology of Concrete Beam Cable-Stayed Bridges Considering Coupling Deformations","authors":"Laifa Wang,&nbsp;Yexun Li,&nbsp;Ziao Liu","doi":"10.1002/cepa.3207","DOIUrl":"https://doi.org/10.1002/cepa.3207","url":null,"abstract":"<p>The main construction control parameters for concrete beam cable-stayed bridges using cable-stayed form traveler construction include the construction pre-camber and the intermediate control cable tension. Traditional calculation analysis treats the form traveler form traveler as a concentrated load, and then obtains the deformation parameters of the form traveler through preloading tests to calculate the elevation for positioning the form traveler. The limited stiffness of the cable-stayed form traveler leads to significant deformations under the action of the stay cables, which further affects the cable tensions and results in substantial deviations in construction control parameters. This paper establishes a construction control calculation method for concrete beam cable-stayed bridges that takes into account the coupled deformations of the form traveler, beam, and stay cables. Through theoretical analysis combined with finite element software calculations, it reveals that the coupling deformations of the form traveler significantly affect the construction pre-camber and the tensions in the stay cables. The calculated construction pre-camber values and the control values for the tension in the intermediate steps of the stay cables, which consider the coupled deformations of the form traveler, ensure that the structural stresses of the form traveler and the main beam remain within a safe range.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1184-1193"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the Influence of Asphalt Pavement Texture on Drainage Performance
ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3247
Xufeng Zhou, Junhui Lu, Yuechi Yu, Zhenghang Yi
{"title":"Study on the Influence of Asphalt Pavement Texture on Drainage Performance","authors":"Xufeng Zhou,&nbsp;Junhui Lu,&nbsp;Yuechi Yu,&nbsp;Zhenghang Yi","doi":"10.1002/cepa.3247","DOIUrl":"https://doi.org/10.1002/cepa.3247","url":null,"abstract":"<p>During rainy weather, water films on road surfaces can reduce skid resistance, leading to hydroplaning and traffic accidents. This study involves collecting images of asphalt pavement and processing these images using image processing techniques to obtain the texture occupancy of the recessed areas of the pavement. To eliminate noise in the asphalt pavement images and make edge features more distinct, the preprocessing steps include grayscaling, image de-noising, and image enhancement. Threshold segmentation is then used to obtain binary images of the asphalt pavement, and contour detection algorithms are applied to extract the texture distribution of the pavement. This allows for the calculation of the texture occupancy ratio of different approximated recessed areas. Water film thickness measurements were performed using a laser refraction method under various texture configurations and rainfall intensities. The study developed predictive models for water film thickness based on the texture occupancy ratio of different approximate diameters. Analysis of the predicted values from these models compared to actual measurements revealed that the predictive model for textures with an approximate diameter greater than 15mm is reliable for estimating water film thickness. Additionally, in the image processing phase, the texture occupancy ratio for textures with an approximate diameter greater than 15mm resulted in faster image processing speeds and was less susceptible to noise interference.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1621-1628"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of Reinforcement Effect of Gravel Pile Combined Geotextile Reinforcement for Widening Highway Subgrade
ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3249
Guangyu Zhang, Shengjian Zhang, Lvjun Zheng, Lu Wei, Zhuo Gong, Zhiyuan Wei, Yongzheng Qi
{"title":"Analysis of Reinforcement Effect of Gravel Pile Combined Geotextile Reinforcement for Widening Highway Subgrade","authors":"Guangyu Zhang,&nbsp;Shengjian Zhang,&nbsp;Lvjun Zheng,&nbsp;Lu Wei,&nbsp;Zhuo Gong,&nbsp;Zhiyuan Wei,&nbsp;Yongzheng Qi","doi":"10.1002/cepa.3249","DOIUrl":"https://doi.org/10.1002/cepa.3249","url":null,"abstract":"<p>In order to study the reinforcement effect of gravel pile geofabric reinforcement on expressway subgrade widening, the subgrade settlement before and after the subgrade widening was numerically simulated against the background of the general subgrade widening project from Anyang to Luoshan Expressway. The results show that the maximum settlement of the subgrade occurs at the new subgrade section centroid, the subgrade settlement is large in the middle and small on both sides, in a “bowl” shape; The post-construction settlement without reinforcement measures is 6.3cm, and the post-construction settlement with gravel pile geotextile reinforcement is 1.2cm, and the settlement is reduced by about 5cm. The reinforcement effect is remarkable and has certain feasibility, which provides experience for similar projects.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1642-1650"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the Effect of Fluid Conductivity on the Protection Effect of Local Scour on Cylindrical Bridge Abutments
ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3251
Wenshe He, Kai Wang, Yongxu Li, Xiulan Ma, Liangliang He, Yikai Li
{"title":"Study on the Effect of Fluid Conductivity on the Protection Effect of Local Scour on Cylindrical Bridge Abutments","authors":"Wenshe He,&nbsp;Kai Wang,&nbsp;Yongxu Li,&nbsp;Xiulan Ma,&nbsp;Liangliang He,&nbsp;Yikai Li","doi":"10.1002/cepa.3251","DOIUrl":"https://doi.org/10.1002/cepa.3251","url":null,"abstract":"<p>Localized scour of bridge abutments is one of the important causes of bridge water damage, which seriously threatens the normal operation of bridges, so the study of its protective measures is particularly important. In order to study the effect of the conductive fluid on the protection effect of local scour of bridge abutments, a three-dimensional numerical model is established based on Flow-3D software, and the experimental data of Ismael and Adnan A are used to verify the reliability of the model. The verified model is then used to study the effect of the change in the width of the bottom edge of the conductive fluid on the morphology of the local scour of the cylindrical abutment and the protection effect. The results show that the fluid conductor can effectively reduce the depth of localized scour pits around the cylindrical abutment, and the protective effect is better for the front of the abutment than for the two sides of the abutment. The protection effect is best when the width of the bottom edge is D, and the protection efficiency is 58.33%.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1667-1672"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spatial Cooperative Mechanical Performance of Steel Plate-concrete Composite Beam Bridge
ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3260
Xiaolei Ma, Wenliang Lu, Xiaolong Li, Wenqiang Peng
{"title":"Spatial Cooperative Mechanical Performance of Steel Plate-concrete Composite Beam Bridge","authors":"Xiaolei Ma,&nbsp;Wenliang Lu,&nbsp;Xiaolong Li,&nbsp;Wenqiang Peng","doi":"10.1002/cepa.3260","DOIUrl":"https://doi.org/10.1002/cepa.3260","url":null,"abstract":"<p>To analyze the spatially coordinated stress performance of steel plate-concrete composite beam bridges, this study focuses on their transverse load distribution coefficients. Firstly, the load transverse distribution coefficient of each main girder is calculated using theoretical methods such as the lever principle method and rigid cross-beam method. Subsequently, a finite element model of a 3×40 m five-girder composite continuous girder bridge system is established. It computes the load transverse distribution coefficients using the finite element method and compares them with the theoretical values. Finally, the variations in the load transverse distribution coefficients for different small crossbeam spacing are analyzed. This research provides insights into the arrangement of transverse connections in steel plate-concrete composite beam bridges and the applicable range of theoretical calculations.</p>","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1757-1764"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143646052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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