Frontiers of Structural and Civil Engineering最新文献_第9页

Hard-rock tunnel lithology identification using multi-scale dilated convolutional attention network based on tunnel face images 利用基于隧道工作面图像的多尺度扩张卷积注意力网络识别硬岩隧道岩性

IF 3 3区工程技术

Frontiers of Structural and Civil Engineering Pub Date : 2024-02-01 DOI: 10.1007/s11709-023-0002-1

Wenjun Zhang, Wuqi Zhang, Gaole Zhang, Jun Huang, Minggeng Li, Xiaohui Wang, Fei Ye, Xiaoming Guan

{"title":"Hard-rock tunnel lithology identification using multi-scale dilated convolutional attention network based on tunnel face images","authors":"Wenjun Zhang, Wuqi Zhang, Gaole Zhang, Jun Huang, Minggeng Li, Xiaohui Wang, Fei Ye, Xiaoming Guan","doi":"10.1007/s11709-023-0002-1","DOIUrl":"https://doi.org/10.1007/s11709-023-0002-1","url":null,"abstract":"For real-time classification of rock-masses in hard-rock tunnels, quick determination of the rock lithology on the tunnel face during construction is essential. Motivated by current breakthroughs in artificial intelligence technology in machine vision, a new automatic detection approach for classifying tunnel lithology based on tunnel face images was developed. The method benefits from residual learning for training a deep convolutional neural network (DCNN), and a multi-scale dilated convolutional attention block is proposed. The block with different dilation rates can provide various receptive fields, and thus it can extract multi-scale features. Moreover, the attention mechanism is utilized to select the salient features adaptively and further improve the performance of the model. In this study, an initial image data set made up of photographs of tunnel faces consisting of basalt, granite, siltstone, and tuff was first collected. After classifying and enhancing the training, validation, and testing data sets, a new image data set was generated. A comparison of the experimental findings demonstrated that the suggested approach outperforms previous classifiers in terms of various indicators, including accuracy, precision, recall, F1-score, and computing time. Finally, a visualization analysis was performed to explain the process of the network in the classification of tunnel lithology through feature extraction. Overall, this study demonstrates the potential of using artificial intelligence methods for in situ rock lithology classification utilizing geological images of the tunnel face.","PeriodicalId":12476,"journal":{"name":"Frontiers of Structural and Civil Engineering","volume":"86 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139663067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Real-time prediction of tunnel face conditions using XGBoost Random Forest algorithm 使用 XGBoost 随机森林算法实时预测隧道工作面状况

IF 3 3区工程技术

Frontiers of Structural and Civil Engineering Pub Date : 2024-01-23 DOI: 10.1007/s11709-023-0044-4

Lei-jie Wu, Xu Li, Ji-dong Yuan, Shuang-jing Wang

{"title":"Real-time prediction of tunnel face conditions using XGBoost Random Forest algorithm","authors":"Lei-jie Wu, Xu Li, Ji-dong Yuan, Shuang-jing Wang","doi":"10.1007/s11709-023-0044-4","DOIUrl":"https://doi.org/10.1007/s11709-023-0044-4","url":null,"abstract":"Real-time perception of rock conditions based on continuously collected data to meet the requirements of continuous Tunnel Boring Machine (TBM) construction presents a critical challenge that warrants increased attention. To achieve this goal, this paper establishes real-time prediction models for fractured and weak rock mass by comparing 6 different algorithms using real-time data collected by the TBM. The models are optimized in terms of selecting metric, selecting input features, and processing imbalanced data. The results demonstrate the following points. (1) The Youden’s index and area under the ROC curve (AUC) are the most appropriate performance metrics, and the XGBoost Random Forest (XGBRF) algorithm exhibits superior prediction and generalization performance. (2) The duration of the TBM loading phase is short, usually within a few minutes after the disc cutter contacts the tunnel face. A model based on the features during the loading phase has a miss rate of 21.8%, indicating that it can meet the early warning needs of TBM construction well. As the TBM continues to operate, the inclusion of features calculated from subsequent data collection can continuously correct the results of the real-time prediction model, ultimately reducing the miss rate to 16.1%. (3) Resampling the imbalanced data set can effectively improve the prediction by the model, while the XGBRF algorithm has certain advantages in dealing with the imbalanced data issue. When the model gives an alarm, the TBM operator and on-site engineer can be reminded and take some necessary measures for avoiding potential tunnel collapse. The real-time predication model can be a useful tool to increase the safety of TBM excavation.","PeriodicalId":12476,"journal":{"name":"Frontiers of Structural and Civil Engineering","volume":"35 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139554604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation of rime ice accretion on a three-dimensional wind turbine blade using a Lagrangian approach 使用拉格朗日方法对三维风力涡轮机叶片上的浮冰积聚进行数值模拟

IF 3 3区工程技术

Frontiers of Structural and Civil Engineering Pub Date : 2024-01-23 DOI: 10.1007/s11709-023-0971-0

Tiange Zhang, Xuanyi Zhou, Zhenbiao Liu

引用次数: 0

Comprehensive experimental database and analysis of circular concrete-filled double-skin tube stub columns: A review 圆形混凝土填充双皮管桩柱的综合实验数据库和分析：综述

IF 3 3区工程技术

Frontiers of Structural and Civil Engineering Pub Date : 2024-01-23 DOI: 10.1007/s11709-023-0970-1

Hongyuan Tang, Hongfei Tan, Sisi Ge, Jieyu Qin, Yuzhuo Wang

{"title":"Comprehensive experimental database and analysis of circular concrete-filled double-skin tube stub columns: A review","authors":"Hongyuan Tang, Hongfei Tan, Sisi Ge, Jieyu Qin, Yuzhuo Wang","doi":"10.1007/s11709-023-0970-1","DOIUrl":"https://doi.org/10.1007/s11709-023-0970-1","url":null,"abstract":"A concrete-filled double-skin tube (CFDST) is a new type of composite material. Experimental studies have been conducted to investigate the axial compression behavior of CFDST members for approximately 30 years. This paper provides a review of the status of axial compression bearing capacity tests conducted on circular CFDST stub columns as well as a summary of test data for 165 circular CFDST stub columns reported in 22 papers. A relatively complete high-quality test database is established. Based on this database, the main factors affecting the axial compression bearing capacity of the CFDST stub columns are analyzed. The prediction accuracy and robustness of an existing theoretical prediction model, which is a data-driven model, are evaluated, and a numerical simulation of the axial compression bearing capacity of the CFDST stub columns is conducted. In addition, the differences between the basic theory and experimental results of various models are compared, and the possible sources of prediction errors are analyzed. The current model for predicting the axial compression capacity of CFDST stub columns cannot simultaneously satisfy the requirements of high accuracy and confidence, and the stress independency assumption introduced in the test is not valid. The main error source in the theoretical prediction model is the non-simultaneous consideration of the effects of the void ratio and inner steel tube.","PeriodicalId":12476,"journal":{"name":"Frontiers of Structural and Civil Engineering","volume":"255 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139554783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An isogeometric approach to free vibration analysis of bi-directional functionally graded porous doubly-curved shallow microshells with variable length-scale parameters 对长度尺度参数可变的双向功能分级多孔双曲浅微壳进行自由振动分析的等距测量法

IF 3 3区工程技术

Frontiers of Structural and Civil Engineering Pub Date : 2024-01-23 DOI: 10.1007/s11709-023-0021-y

Khuat Duc Duong, Dao Nhu Mai, Phung Van Minh, Tran Van Ke

{"title":"An isogeometric approach to free vibration analysis of bi-directional functionally graded porous doubly-curved shallow microshells with variable length-scale parameters","authors":"Khuat Duc Duong, Dao Nhu Mai, Phung Van Minh, Tran Van Ke","doi":"10.1007/s11709-023-0021-y","DOIUrl":"https://doi.org/10.1007/s11709-023-0021-y","url":null,"abstract":"This study uses iso-geometric investigation, which is based on the non-uniform rational B-splines (NURBS) basis function, to investigate natural oscillation of bi-directional functionally graded porous (BFGP) doubly-curved shallow microshells placed on Pasternak foundations with any boundary conditions. The characteristics of the present material vary in both thickness and axial directions along the x-axis. To be more specific, a material length-scale coefficient of the microshell varies in both thickness and length directions as the material’s mechanical properties. One is able to develop a differential equation system with varying coefficients that regulate the motion of BFGP double-curved shallow microshells by using Hamilton principle, Kirchhoff–Love hypothesis, and modified couple stress theory. The numerical findings are reported for thin microshells that are spherical, cylindrical, and hyperbolic paraboloidal, with a variety of planforms, including rectangles and circles. The validity and effectiveness of the established model are shown by comparing the numerical results given by the proposed formulations with previously published findings in many specific circumstances. In addition, influences of length scale parameters, power-law indexes, thickness-to-side ratio, and radius ratio on natural oscillation responses of BFGP microshells are investigated in detail.","PeriodicalId":12476,"journal":{"name":"Frontiers of Structural and Civil Engineering","volume":"5 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139554626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Calibration method of mesoscopic parameter in sandy cobble soil triaxial test based on PFC3D 基于 PFC3D 的砂卵石土三轴试验介观参数校准方法

IF 3 3区工程技术

Frontiers of Structural and Civil Engineering Pub Date : 2024-01-13 DOI: 10.1007/s11709-023-0028-4

Pengfei Li, Xiaopu Cui, Yingjie Wei, Junwei Xia, Xinyu Wang

引用次数: 0

Microcapsule-enabled self-healing concrete: A bibliometric analysis 微胶囊自愈合混凝土：文献计量分析

IF 3 3区工程技术

Frontiers of Structural and Civil Engineering Pub Date : 2024-01-13 DOI: 10.1007/s11709-023-0023-9

Shuai Zhou, Zijian Li, Kai Li, Yue Jia, Chong Wang, Xiaoying Zhuang

引用次数: 0

Properties and printability evaluation of three-dimensional printing magnesium oxychloride cement by fully utilizing aeolian sand 充分利用风化砂的三维印刷氧氯化镁水泥的性能和印刷适性评估

IF 3 3区工程技术

Frontiers of Structural and Civil Engineering Pub Date : 2024-01-12 DOI: 10.1007/s11709-023-0994-6

Qinghua Wang, Jinggang Xu, Duo Feng, Wei Li, Yuanyuan Zhou, Qiao Wang

{"title":"Properties and printability evaluation of three-dimensional printing magnesium oxychloride cement by fully utilizing aeolian sand","authors":"Qinghua Wang, Jinggang Xu, Duo Feng, Wei Li, Yuanyuan Zhou, Qiao Wang","doi":"10.1007/s11709-023-0994-6","DOIUrl":"https://doi.org/10.1007/s11709-023-0994-6","url":null,"abstract":"Three-dimensional concrete printing (3DCP) is increasingly being applied in harsh environments and isolated regions. However, the effective utilization of aeolian sand (AS) resources and by-products derived from arid zones for 3DCP is yet to be fully realized. This study developed a three-dimensional (3D) printing composite using AS and magnesium oxychloride cement (MOC) from local materials. The effects of the mole ratio of MgO/MgCl2 and sand/binder (S/B) ratio on the mechanical properties such as water resistance, drying shrinkage strain, rheology, and printability, were investigated systematically. The results indicated that the optimal mole ratio of MgO/MgCl2 was 8, which yielded the desired mechanical performance and water resistance. Furthermore, the S/B ratio can be increased to three within the desired printability to increase the AS utilization rate. The rheological recovery and buildability of the 3D-printed MOC with AS were verified. These findings provide a promising strategy for construction in remote deserts.","PeriodicalId":12476,"journal":{"name":"Frontiers of Structural and Civil Engineering","volume":"40 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139459247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical behavior and permeability properties of sustainable and high-performance anisotropic three-dimensional printable concrete 可持续高性能各向异性三维可打印混凝土的力学行为和渗透特性

IF 3 3区工程技术

Frontiers of Structural and Civil Engineering Pub Date : 2024-01-12 DOI: 10.1007/s11709-023-0962-1

Fatih Özalp

{"title":"Mechanical behavior and permeability properties of sustainable and high-performance anisotropic three-dimensional printable concrete","authors":"Fatih Özalp","doi":"10.1007/s11709-023-0962-1","DOIUrl":"https://doi.org/10.1007/s11709-023-0962-1","url":null,"abstract":"Three-dimensional printable concrete requires further development owing to the challenges encountered, including its brittle behavior, high cement requirement for the buildability of layers, and anisotropic behavior in different directions. The aim of this study is to overcome these challenges. First, three-dimensional printable concrete mixtures were prepared using silica fume, ground blast furnace slag, and metakaolin, instead of cement, to reduce the amount of cement. Subsequently, the rheological and mechanical behaviors of these concretes were investigated. Second, three-dimensional printable concrete mixtures were prepared using 6-mm-long steel and synthetic fibers to eliminate brittleness and determine the effect of those fibers on the anisotropic behavior of the concrete. As a result of this study, it is understood that printable concretes with extremely low permeability and high buildability can be achieved using mineral additives. In addition, results showed that three-dimensional concrete samples containing short steel fibers achieve fracture energies up to 36 times greater than that of plain concrete. Meanwhile, its characteristic length values, as indicators of ductility, are 22 times higher than those of plain concrete. The weakest strength was recorded at the interfaces between layers. The bending and splitting tensile strengths of three-dimensional printed plain concrete samples were 15% and 19% lower than those of casted samples, respectively. However, the addition of fibers improved the mechanical strength of the interfaces significantly.","PeriodicalId":12476,"journal":{"name":"Frontiers of Structural and Civil Engineering","volume":"45 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139459250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Drainage design combining drain holes and pinholes for tunnel boring machine segments subject to high water pressure 结合排水孔和针孔的排水设计，用于承受高水压的隧道掘进机区段

IF 3 3区工程技术

Frontiers of Structural and Civil Engineering Pub Date : 2024-01-12 DOI: 10.1007/s11709-023-0948-z

Yao Lu, Ming Huang, Zhijie Chen, Zisheng Zeng, Yuchuan Liu, Guangzhao Du

{"title":"Drainage design combining drain holes and pinholes for tunnel boring machine segments subject to high water pressure","authors":"Yao Lu, Ming Huang, Zhijie Chen, Zisheng Zeng, Yuchuan Liu, Guangzhao Du","doi":"10.1007/s11709-023-0948-z","DOIUrl":"https://doi.org/10.1007/s11709-023-0948-z","url":null,"abstract":"Balance of the groundwater and ecology is crucial for controlled discharge. However, regarding the segments of tunnel boring machines (TBMs) under high water pressure, the stability of the lining structure is often reduced by excessive drain holes required to achieve this balance. The large discharge of pinholes can easily have severe consequences, such as the lowering of the groundwater table, drying of springs, and vegetation wilting. Thus, in this study, according to the fluid-structure coupling theory, a new drainage design for TBM segments was developed by considering a mountain tunnel subject to a high water pressure as a case study. The evolution characteristics, including the external water pressure of the lining, discharge volume of the segment, and groundwater-table drawdown, were investigated via numerical modeling with drain holes and pinholes. The results indicated that the optimal design parameters of drainage segments for the project case were as follows: a circumferential spacing angle and longitudinal number on one side of a single ring of 51° and 2, respectively, for the drain holes and an inclination angle and length of 46.41° and 0.25 times the grouting thickness, respectively, for the pin holes.","PeriodicalId":12476,"journal":{"name":"Frontiers of Structural and Civil Engineering","volume":"9 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139459485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0