To determine the ultimate bearing capacity of foundations on sloping ground surface in practice, energy dissipation method was used to formulate the beating capacity as programming problem, and full-scale model experi...To determine the ultimate bearing capacity of foundations on sloping ground surface in practice, energy dissipation method was used to formulate the beating capacity as programming problem, and full-scale model experiments were investigated to analyze the performance of the soil slopes loaded by a strip footing in laboratory. The soil failure is governed by a linear Mohr-Coulomb yield criterion, and soil deformation follows an associated flow rule. Based on the energy dissipation method of plastic mechanics, a multi-wedge translational failure mechanism was employed to obtain the three bearing capacity factors related to cohesion, equivalent surcharge load and the unit gravity for various slope inclination angles. Numerical results were compared with those of the published solutions using finite element method and those of model experiments. The bearing capacity factors were presented in the form of design charts for practical use in engineering. The results show that limit analysis solutions approximate to those of model tests, and that the energy dissipation method is effective to estimate bearing capacity of soil slope.展开更多
运用建筑信息模型(Building Information Modeling,BIM)技术,以北魏宣武帝景陵遗址为对象进行虚拟建构实验教学。针对外业信息采集、内业数据处理、建筑内部病害标记与汇总、BIM模型建构与虚拟修缮4个模块开展对学生仪器使用、数据处理...运用建筑信息模型(Building Information Modeling,BIM)技术,以北魏宣武帝景陵遗址为对象进行虚拟建构实验教学。针对外业信息采集、内业数据处理、建筑内部病害标记与汇总、BIM模型建构与虚拟修缮4个模块开展对学生仪器使用、数据处理、建筑病害整理和BIM建模方法等方面的对应训练。教学实践表明,结合建筑遗产实际项目的实验教学能够有效保障学生对于相关技术的理解与掌握,锻炼设备操作与课题研究能力,锤炼专业技能的同时进一步提升遗产保护意识、开拓遗产保护视野。展开更多
大语言模型(large language model,LLM)在一般性教学辅助、文科课程和计算机课程中得到成功应用,但应用于电力电子实验教学时存在电路拓扑图识别不准、关键信息缺失等问题。为此,该文提出基于智能插件和LLM的教学辅助设计方法:首先通过...大语言模型(large language model,LLM)在一般性教学辅助、文科课程和计算机课程中得到成功应用,但应用于电力电子实验教学时存在电路拓扑图识别不准、关键信息缺失等问题。为此,该文提出基于智能插件和LLM的教学辅助设计方法:首先通过深度学习模型实现电路拓扑图识别,并将其转换为电路网表文本;然后向LLM提供网表文本及不同提示词,引导LLM实现网表检查、电路分析、文档生成、知识问答等教学功能,为教师提供高质量的教学设计起点。该方法有望减轻教师负担,提高实验教学的时效性和教学质量,为电力电子实验教学设计提供一种有用工具。展开更多
In order to study the dynamic response of the rail embankment under different speeds and moving load of following vehicles,a model experiment with a ratio of 1:10 is established to test the time history of acceleratio...In order to study the dynamic response of the rail embankment under different speeds and moving load of following vehicles,a model experiment with a ratio of 1:10 is established to test the time history of acceleration and the earth pressure of the embankment at various train speeds.Using the ABAQUS finite element calculation software,a train load is applied through the FORTRAN subroutine,thereby establishing a three-dimensional finite element model with the same size as the model experiment.The data and conclusions of the finite element method model are verified by the model experiment.The model also makes some supplements to the model experiment.The experimental results show that with the increase of speed,the peak acceleration and earth pressure of the embankment also increase.By analyzing the experimental data,it can also be found that the vertical acceleration of the embankment is much greater than the axial acceleration and the lateral acceleration.In addition,the elastic modulus of the soil and the sleeper pitch also have some influence on the acceleration.展开更多
基金Project(50408020) supported by the National Natural Science Foundation of Chinaproject(05-0686) supported by the Program of New Century Excellent Talents in Universityproject(200550) supported by the Foundation for the Author of National Excellent Doctoral Dissertation of China
文摘To determine the ultimate bearing capacity of foundations on sloping ground surface in practice, energy dissipation method was used to formulate the beating capacity as programming problem, and full-scale model experiments were investigated to analyze the performance of the soil slopes loaded by a strip footing in laboratory. The soil failure is governed by a linear Mohr-Coulomb yield criterion, and soil deformation follows an associated flow rule. Based on the energy dissipation method of plastic mechanics, a multi-wedge translational failure mechanism was employed to obtain the three bearing capacity factors related to cohesion, equivalent surcharge load and the unit gravity for various slope inclination angles. Numerical results were compared with those of the published solutions using finite element method and those of model experiments. The bearing capacity factors were presented in the form of design charts for practical use in engineering. The results show that limit analysis solutions approximate to those of model tests, and that the energy dissipation method is effective to estimate bearing capacity of soil slope.
文摘运用建筑信息模型(Building Information Modeling,BIM)技术,以北魏宣武帝景陵遗址为对象进行虚拟建构实验教学。针对外业信息采集、内业数据处理、建筑内部病害标记与汇总、BIM模型建构与虚拟修缮4个模块开展对学生仪器使用、数据处理、建筑病害整理和BIM建模方法等方面的对应训练。教学实践表明,结合建筑遗产实际项目的实验教学能够有效保障学生对于相关技术的理解与掌握,锻炼设备操作与课题研究能力,锤炼专业技能的同时进一步提升遗产保护意识、开拓遗产保护视野。
文摘大语言模型(large language model,LLM)在一般性教学辅助、文科课程和计算机课程中得到成功应用,但应用于电力电子实验教学时存在电路拓扑图识别不准、关键信息缺失等问题。为此,该文提出基于智能插件和LLM的教学辅助设计方法:首先通过深度学习模型实现电路拓扑图识别,并将其转换为电路网表文本;然后向LLM提供网表文本及不同提示词,引导LLM实现网表检查、电路分析、文档生成、知识问答等教学功能,为教师提供高质量的教学设计起点。该方法有望减轻教师负担,提高实验教学的时效性和教学质量,为电力电子实验教学设计提供一种有用工具。
基金Project(2018YFE0207100)supported by the National Key R&D Program of ChinaProject(52078426)supported by the National Natural Science Fundation of China+4 种基金Projects(2020YJ0253,2020YFSY0060,2019JDRC0133,2019JDRC0134)supported by the Sichuan Provincial Science and Technology Support Project,ChinaProject(K2019G009)supported by the Science and Technology Research and Development Plan of China National Railway Corporation LimitedProjects(SY2016G003,N2020T004)supported by the China National Railway Group Co.Ltd.Scientific Research ProjectProject(LNTCCMA-20210109)supported by the Key Laboratory of New Technology for Construction of Cities in Mountain Area,ChinaProject(2021M692689)supported by the China Postdoctoral Science Foundation。
文摘In order to study the dynamic response of the rail embankment under different speeds and moving load of following vehicles,a model experiment with a ratio of 1:10 is established to test the time history of acceleration and the earth pressure of the embankment at various train speeds.Using the ABAQUS finite element calculation software,a train load is applied through the FORTRAN subroutine,thereby establishing a three-dimensional finite element model with the same size as the model experiment.The data and conclusions of the finite element method model are verified by the model experiment.The model also makes some supplements to the model experiment.The experimental results show that with the increase of speed,the peak acceleration and earth pressure of the embankment also increase.By analyzing the experimental data,it can also be found that the vertical acceleration of the embankment is much greater than the axial acceleration and the lateral acceleration.In addition,the elastic modulus of the soil and the sleeper pitch also have some influence on the acceleration.
