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Numerical simulation of influence of section geometry on surrounding rock stability of arch tunnel with straight wall 直墙拱道断面几何形状对围岩稳定性影响的数值模拟
Pub Date : 2022-12-22 DOI: 10.1117/12.2657861
Biao Wang, Yang Wang, Zhenhua Zhang, Shuai Tao
Based on the Mohr-Coulomb strain softening model, the nonlinear CWFS criterion of friction strengthening and cohesion weakening is adopted, and the deterioration behavior of tensile strength and stiffness modulus caused by tensile-shear coupling yield of intact rock mass is considered. Through two different modeling methods, the influence of geometric characteristics of straight wall arch tunnel section on the failure of surrounding rock and rock-burst is simulated. The results show that the geometric characteristics of tunnel section have obvious influence on the stability of surrounding rock. The rise-span ratios are 0.5, 0.297 and 0.16, and the height of straight wall is 0.875 m. The plastic zone, rock-burst zone, tensile yield zone and shear strain localization zone of surrounding rock decrease with the decrease of rise-span ratio. When the rise-span ratios are 0.5, 0.297 and 0.16, and the vertical wall heights are 0.875 m, 1.23 m and 1.47 m, respectively, the plastic zone, rock-burst zone, tensile yield zone and shear strain localization zone of surrounding rock increase significantly with the decrease of rise-span ratio. When the rise-span ratio is 0.16 and the straight wall height H4 = 1.47 m, the maximum shear strain increment is about 10-2 , which is an order of magnitude higher than other schemes. According to Russense rock-burst criterion and shear strain localization results, the rock-burst units are mainly concentrated in the top and bottom of the tunnel section, which is consistent with the rock-burst position recorded in the field tunnel.
基于Mohr-Coulomb应变软化模型,采用摩擦强化和黏聚弱化的非线性CWFS准则,考虑了完整岩体拉剪耦合屈服引起的抗拉强度和刚度模量劣化行为。通过两种不同的建模方法,模拟了直墙拱隧洞断面几何特征对围岩破坏和冲击地压的影响。结果表明,隧道断面几何特征对围岩稳定性有明显影响。纵横比分别为0.5、0.297和0.16,直墙高度为0.875 m。围岩的塑性区、冲击地压区、抗拉屈服区和剪切应变局部化区随着升跨比的减小而减小。当升跨比为0.5、0.297和0.16,竖向墙高分别为0.875 m、1.23 m和1.47 m时,随着升跨比的减小,围岩塑性区、冲击地压区、拉伸屈服区和剪切应变局部化区显著增大。当升跨比为0.16,直墙高H4 = 1.47 m时,最大剪切应变增量约为10-2,比其他方案高一个数量级。根据Russense岩爆判据和剪切应变局部化结果,岩爆单元主要集中在巷道断面的顶部和底部,这与现场巷道记录的岩爆位置一致。
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引用次数: 0
A game study of stakeholders of smart transportation project in China 中国智慧交通项目利益相关者博弈研究
Pub Date : 2022-12-22 DOI: 10.1117/12.2657921
Dong Wang, Yingjie Hu
In China, the smart transportation project mode is top-down, dominated by the government, participated by enterprises, and used by the public. The behavior strategy choice of different stakeholders will affect the process and effect of the smart transportation project. This paper takes the stakeholders of intelligent transportation as the research object, analyzes the game under different behavior strategies from the two stages of construction and operation, and finds out the best behavior for all parties of the project, to ensure smooth progress and effect of the intelligent transportation project.
在中国,智慧交通项目模式是自上而下、政府主导、企业参与、大众使用。不同利益相关者的行为策略选择将影响智能交通项目的过程和效果。本文以智能交通的利益相关者为研究对象,从建设和运营两个阶段分析不同行为策略下的博弈,找出项目各方的最佳行为,以保证智能交通项目的顺利进行和效果。
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引用次数: 0
An evaluation study on the combined effects of the ACC and AEB systems ACC与AEB系统联合效果的评价研究
Pub Date : 2022-12-22 DOI: 10.1117/12.2657893
Xingfei Xing, Kai Wang
In this paper, an evaluation method for the combined action of automatic emergency braking (AEB) and adaptive cruise control (ACC) was proposed. To evaluate the effectiveness of the test method, the test scenarios of “stationary vehicle in the curve” and “front car cut-in” were constructed. The tests were conducted on dry asphalt roads and the ISO 19206 standard was used as a vehicle target, and the combined effects of the AEB and ACC systems were carried out according to the test cases. By analyzing the test data such as speed, deceleration, relative speed to the front car, and relative longitudinal distance from the front car, the impact of ACC and AEB on occupant comfort and driving safety under the joint action of AEB and ACC was obtained.
提出了一种自动紧急制动(AEB)与自适应巡航控制(ACC)联合作用的评价方法。为评价该测试方法的有效性,构建了“曲线中静止车辆”和“前车切入”的测试场景。试验在干沥青路面上进行,以ISO 19206标准为车辆目标,并根据试验案例进行了AEB和ACC系统的联合效应研究。通过对车速、减速度、与前车相对速度、与前车相对纵向距离等试验数据的分析,得到了在AEB和ACC共同作用下,ACC和AEB对乘员舒适性和驾驶安全性的影响。
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引用次数: 0
Multi-class identification of urban bus bunching rate based on XGBoost 基于XGBoost的城市公交集群率多类识别
Pub Date : 2022-12-22 DOI: 10.1117/12.2658598
Qian Liu, Mei Xiao, X. Ming, Hongtao Huang
It is of great practical significance to identify the state of bus bunching in advance so as to take reasonable measures. In order to improve the identification performance, a identification model based on Extreme Gradient Boosting (XGBoost) is proposed for multi classification of bus bunching rate. Firstly, using variance filtering and recursive feature elimination to screen the factors affecting the bus bunching rate. Secondly, SMOTE algorithm is used to deal with the data imbalance. Finally, XGBoost model is used to identify the multi classification of the bus bunching rate, and this paper compares the proposed model with other models. The research shows that the XGBoost model proposed in this paper has the best results in measurement indicators of identification performance, which verifies the applicability of the model to accurately identify the categories of bus bunching rate.
提前识别客车的拥堵状态,以便采取合理的措施,具有重要的现实意义。为了提高识别性能,提出了一种基于极限梯度增强(XGBoost)的多分类总线聚束率识别模型。首先,利用方差滤波和递归特征消去对影响总线聚束率的因素进行筛选。其次,采用SMOTE算法处理数据不平衡问题。最后,利用XGBoost模型对总线聚束率进行多分类识别,并与其他模型进行比较。研究表明,本文提出的XGBoost模型在识别性能的度量指标上效果最好,验证了该模型在准确识别总线簇率类别方面的适用性。
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引用次数: 0
Dynamic monitoring system of prefabricated component production line based on digital twin 基于数字孪生的预制构件生产线动态监控系统
Pub Date : 2022-12-22 DOI: 10.1117/12.2658288
Xinyi Liu, Ren-Kai Jiang, Xinqiu Wei, Guo-qiang Zhang, Linqian Tian, Ling Wang, X. Zheng
With the rapid development of information technology, the manufacturing industry is transforming to digitization and intelligence. The realization of real-time interaction and data fusion between physical factory and virtual factory is one of the bottlenecks to realize intelligence. To avoid this issue, it is necessary to design a dynamic monitoring system of prefabricated component production line based on digital twin technology. The system architecture includes physical layer, data layer, virtual layer and application layer, and the interconnection of all levels of the monitoring system is realized by using information technologies such as the Internet of Things, PLC and MES. Through data integration display and virtual factory display, the on-site comprehensive monitoring and intelligent simulation analysis of the production line can accurately locate the abnormal conditions in the production process, which can provide early warning and optimization decisions quickly. The results show that the system can monitor and predict the production line in real time, and has good practicability, which can provide a reference for the realization of dynamic monitoring of the production line.
随着信息技术的快速发展,制造业正在向数字化、智能化转型。实现实体工厂和虚拟工厂之间的实时交互和数据融合是实现智能化的瓶颈之一。为了避免这一问题,有必要设计一个基于数字孪生技术的预制构件生产线动态监控系统。系统架构包括物理层、数据层、虚拟层和应用层,利用物联网、PLC、MES等信息技术实现监控系统各层的互联互通。通过数据集成显示和虚拟工厂显示,对生产线进行现场全面监控和智能模拟分析,可以准确定位生产过程中的异常情况,快速提供预警和优化决策。结果表明,该系统能够对生产线进行实时监控和预测,具有较好的实用性,可为实现生产线的动态监控提供参考。
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引用次数: 0
Freight traffic of civil aviation volume forecast based on hybrid ARIMA-LR model 基于ARIMA-LR混合模型的民航货运量预测
Pub Date : 2022-12-22 DOI: 10.1117/12.2657975
Bin Chen, Jiacheng Liu, Zhouying Ruan, Ming Yue, Hansen Long, Weiping Yao
Freight traffic of civil aviation has developed rapidly because of its advantages of fast transportation speed and high safety. The fluctuation of freight traffic of civil aviation has brought many challenges to air traffic scheduling. If the freight traffic of civil aviation volume can be accurately predicted, the difficulty of air traffic scheduling will be reduced and the transportation efficiency of air cargo will be improved. The current prediction model can’t properly respond to the impact of emergencies. And it is not sensitive to the trend variations caused by policies, epidemics and other factors. In this paper, based on the autoregressive integrated moving average model (ARIMA) and linear regression model (LR), a hybrid ARIMA-LR model is proposed by using an improved Bayesian combined model. Through the prediction of the actual freight traffic of civil aviation volume, it is found that the hybrid ARIMA-LR model can not only better adapt to the changes caused by emergencies, but also have higher overall prediction accuracy than the ARIMA model and LR model. The three indicators of mean absolute error (MAE), mean square error (MSE) and mean absolute percentage error (MAPE) of the hybrid ARIMA-LR model are 1.06,29.02,0.03 lower than that of the ARIMA model; compared with the LR model, it is reduced by 3.00,92.00,0.06.
民航货运量以其运输速度快、安全性高等优点而迅速发展。民航货运量的波动给航空交通调度带来了诸多挑战。如果能够准确预测民航货运量,将会降低航空交通调度的难度,提高航空货运的运输效率。现有的预测模型不能很好地应对突发事件的影响。对政策、疫情等因素引起的趋势变化不敏感。本文在自回归综合移动平均模型(ARIMA)和线性回归模型(LR)的基础上,采用改进的贝叶斯组合模型,提出了一种ARIMA-LR混合模型。通过对民航货运量的实际预测,发现ARIMA-LR混合模型不仅能更好地适应突发事件引起的变化,而且比ARIMA模型和LR模型具有更高的整体预测精度。ARIMA- lr混合模型的平均绝对误差(MAE)、均方误差(MSE)和平均绝对百分比误差(MAPE)三个指标分别比ARIMA模型低1.06、29.02和0.03;与LR模型相比,分别降低了3.00、92.00、0.06。
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引用次数: 0
Automated scenario generation and iterative regression testing method for autonomous driving systems 自动驾驶系统的自动场景生成与迭代回归测试方法
Pub Date : 2022-12-22 DOI: 10.1117/12.2657984
Jianli Duan, Rui Wang, Shulian Zhao, Mengxia Hu, Hua Chen, Chuzhao Li, Hao Wu, Pengfei Bai, Yi Wang, Keqiang Li
In this paper, we propose a new automatic test and evaluation method that can be used for autonomous driving systems in virtual simulation test. Aiming at the problems that the existing automated test method cannot guarantee coverage and validity of the test scenarios, and evaluation lacks the consideration of the complete development life cycle of the systems, we firstly introduce a new scenarios generation method that can generate scenarios with higher overall effectivity on the premise of ensuring coverage. Then, an integrated test platform is constructed, in which the components can be automatically invoked by test scripts. Finally, the automated iterative regression testing is used to ensure the effectiveness of the whole development and test process. The application and verification of a level three (L3) Traffic Jam Pilot (TJP) system is carried out on the above-stated method. The result shows that the proposed method can effectively detect system defects and significantly improve test efficiency.
本文提出了一种可用于自动驾驶系统虚拟仿真测试的自动测试与评估方法。针对现有自动化测试方法无法保证测试场景的覆盖和有效性,评估缺乏对系统完整开发生命周期的考虑等问题,首先引入了一种新的场景生成方法,在保证覆盖的前提下,生成整体效率更高的场景。然后,构建了一个集成的测试平台,其中的组件可以被测试脚本自动调用。最后,采用自动化迭代回归测试来保证整个开发和测试过程的有效性。三级(L3)交通阻塞领航员(TJP)系统的应用和验证是根据上述方法进行的。结果表明,该方法能够有效地检测出系统缺陷,显著提高了测试效率。
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引用次数: 0
Research on transportation risk prediction method based on coupling analysis 基于耦合分析的运输风险预测方法研究
Pub Date : 2022-12-22 DOI: 10.1117/12.2657849
Mingkuan Wu, Huaili Chen
With the continuous development of my country's economy, my country's road traffic is also constantly being constructed, and people's traffic travel has also shown a diversified development, which makes people put forward higher requirements for safe travel. For a long time, due to the lack of understanding of the disaster mechanism and causes of road traffic accidents in my country, the ability to prevent and control road traffic accidents in my country has been affected to a large extent. The quality of life and economic development of residents have been seriously affected. In order to reduce the probability of traffic accidents, it is very important to carry out effective risk assessment of road traffic accidents, evaluate the risk level of roads and formulate corresponding management countermeasures. Finally, taking a road as an example, the constructed road traffic risk assessment model is applied.
随着我国经济的不断发展,我国的道路交通也在不断建设,人们的交通出行也呈现出多元化的发展,这使得人们对安全出行提出了更高的要求。长期以来,由于对我国道路交通事故发生的机理和原因缺乏了解,我国道路交通事故的防治能力受到很大影响。居民的生活质量和经济发展受到严重影响。为了降低交通事故发生的概率,对道路交通事故进行有效的风险评估,评价道路的风险等级,制定相应的管理对策就显得十分重要。最后,以某道路为例,应用所构建的道路交通风险评估模型。
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引用次数: 0
Research on risk assessment of large-span steel structure project construction phase based on variable weight-two dimensional cloud model 基于变重二维云模型的大跨度钢结构工程施工阶段风险评估研究
Pub Date : 2022-12-22 DOI: 10.1117/12.2658181
Hou Feng, Weizhen Ma, Haiyan Wen
As an all-round emerging branch of the construction industry, large-span steel structure engineering has a long on-site construction period, complex on-site construction process, and a series of uncertain unfavorable factors. The resulting risks will directly affect the smooth progress of large-span steel structure projects. In order to improve the effective control of risks in the construction stage of long-span steel structures, a risk assessment model for the construction stage of long-span steel structures based on variable weight theory is proposed. The WSR system method is used to analyze the construction risks, and a comprehensive evaluation index system for risks in the construction stage of large-span steel structures is constructed. With the help of the variable weight comprehensive model, the two-dimensional cloud model is used to comprehensively evaluate the risks of the large-span steel structure in the construction stage from the two dimensions of risk hazard and risk probability. Finally, the two-dimensional cloud image is drawn through MATLAB and the fit degree is calculated to further determine the evaluation result. Taking a large-span steel structure stadium in Lanzhou City, Gansu Province as the research object, a comprehensive assessment of the risks of the large-span steel structure construction stage was carried out, confirm the applicability and effectiveness of the model.
大跨度钢结构工程作为建筑业的一个全方位新兴分支,现场施工周期长,现场施工过程复杂,存在一系列不确定的不利因素。由此产生的风险将直接影响大跨度钢结构工程的顺利进行。为了提高对大跨度钢结构施工阶段风险的有效控制,提出了一种基于变重理论的大跨度钢结构施工阶段风险评估模型。采用WSR体系方法对大跨度钢结构施工阶段风险进行分析,构建了大跨度钢结构施工阶段风险综合评价指标体系。借助变权综合模型,利用二维云模型从风险危害和风险概率两个维度对大跨度钢结构施工阶段的风险进行综合评价。最后,通过MATLAB绘制二维云图,计算拟合度,进一步确定评价结果。以甘肃省兰州市某大跨度钢结构体育馆为研究对象,对大跨度钢结构施工阶段的风险进行了综合评估,验证了模型的适用性和有效性。
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引用次数: 0
The evolution and redevelopment of Birmingham New Street Station and surrounding areas 伯明翰新街车站及周边地区的演变和重建
Pub Date : 2022-12-22 DOI: 10.1117/12.2657821
Qianyu Du
The fundamental function of railway station is a tool for rapid passage of people and goods. The long-distance transportation function would be paid more attention by designers, neither than aesthetics and integration with cities. The Birmingham New Street Station had a long history since establishment. The railway station, in common with many other industrialized zone, has experienced major changes over the last 100 years. It went through 4 stages, which was mainly used for freight transportation initially. After that, it gradually turned to a comprehensive transportation hub. And finally Birmingham New Street Station developed into an urban space with people-oriented, convenient travel and commercial vitality. It is necessary and valuable to analyze the evolution and redevelopment of the railway station. This paper is aimed to summarize the development trend and optimization strategy of railway stations in central urban area and surrounding areas. It makes an in-depth study on the development history of Birmingham New Street Station, the type and site selection of station buildings, the commercial development mode of the station and its surrounding areas, and the connection organization between the station and urban traffic. Suggestion for the further development of railway stations in central cities could be proposed.
火车站的基本功能是提供人员和货物快速通行的工具。比起美观和与城市的融合,设计师更关注的是长途交通的功能。伯明翰新街车站自建立以来历史悠久。火车站和许多其他工业区一样,在过去的100年里经历了重大的变化。它经历了4个阶段,最初主要用于货运。此后,它逐渐成为一个综合交通枢纽。最终伯明翰新街站发展成为一个以人为本,出行便利,商业活力的城市空间。分析火车站的演变与改造是十分必要和有价值的。本文旨在总结中心城区及周边地区火车站的发展趋势及优化策略。对伯明翰新街车站的发展历史、车站建筑的类型和选址、车站及其周边地区的商业发展模式、车站与城市交通的连接组织进行了深入的研究。对中心城市火车站的进一步发展提出建议。
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引用次数: 0
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Conference on Smart Transportation and City Engineering
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