In order to effectively prevent the spread of novel coronavirus pneumonia and ensure the orderly development of teaching tasks,colleges and universities have launched online teaching activities.As a new teaching metho...In order to effectively prevent the spread of novel coronavirus pneumonia and ensure the orderly development of teaching tasks,colleges and universities have launched online teaching activities.As a new teaching method,how to reasonably carry out teaching design,teaching organization and ensure teaching quality has become a new problem in front of educators.Taking the“Subway”course as an example,this paper summarizes and introduces the online teaching methods and personal experience under the epidemic situation from the aspects of the overall framework design,specific implementation scheme,effect investigation and reflection of the online teaching mode based on MOOC platform,so as to enrich the experience of online teaching activities in colleges and universities during the epidemic period.展开更多
Graduation project(thesis)is an important practice part in undergraduate education,which forms an organic whole with theoretical teaching link,and it is the continuation,deepening and examination of the theoretical te...Graduation project(thesis)is an important practice part in undergraduate education,which forms an organic whole with theoretical teaching link,and it is the continuation,deepening and examination of the theoretical teaching part.This paper focuses on the constitution that the lack of quality standards for undergraduate graduation design,resulting in different depth and breadth standards;the graduation design materials are scattered and lack of standardization,which leads to the lack of systematic reference materials for students,taking the tunnel and underground engineering major as an example,this paper carries out the practice research on the standardization of the graduation design of tunnel and underground engineering through investigation and combining the teaching resources accumulated in the past decades.Through the study of practice,the content of undergraduate graduation design of tunnel and underground engineering is standardized,the breadth and depth of graduation design is defined,and the“Guide for undergraduate graduation design of tunnel and underground engineering”is organized and compiled,which can provide reference for the standardization and guidance of undergraduate graduation design of tunnel and underground engineering.展开更多
Outwash deposit is one of the major threats to the safety and stability of railway transit engineering in the Sichuan–Tibet area.In this paper,different samples of outwash deposits were prepared based on the random s...Outwash deposit is one of the major threats to the safety and stability of railway transit engineering in the Sichuan–Tibet area.In this paper,different samples of outwash deposits were prepared based on the random structure method,and a series of large-scale direct shear tests were carried out under different normal stresses.The influence of stone content and the spatial distribution of stone blocks on the physical and mechanical properties of outwash deposits were studied.The results show that with the increase of stone content,the shear stress-displacement curve changs from strain softening to strain hardening.The shear zone is larger,and its shape is more tortuous due to the movement and rotation of stone blocks.The internal frictional angle increases linearly while the cohesion diseases with the increase of stone content.The main influence of the spatial distribution of stone blocks on the mechanical properties of outwash deposits is the peak stress.The shear zone is mainly determined by the distribution of the stone blocks near the shear zone.展开更多
文摘In order to effectively prevent the spread of novel coronavirus pneumonia and ensure the orderly development of teaching tasks,colleges and universities have launched online teaching activities.As a new teaching method,how to reasonably carry out teaching design,teaching organization and ensure teaching quality has become a new problem in front of educators.Taking the“Subway”course as an example,this paper summarizes and introduces the online teaching methods and personal experience under the epidemic situation from the aspects of the overall framework design,specific implementation scheme,effect investigation and reflection of the online teaching mode based on MOOC platform,so as to enrich the experience of online teaching activities in colleges and universities during the epidemic period.
文摘Graduation project(thesis)is an important practice part in undergraduate education,which forms an organic whole with theoretical teaching link,and it is the continuation,deepening and examination of the theoretical teaching part.This paper focuses on the constitution that the lack of quality standards for undergraduate graduation design,resulting in different depth and breadth standards;the graduation design materials are scattered and lack of standardization,which leads to the lack of systematic reference materials for students,taking the tunnel and underground engineering major as an example,this paper carries out the practice research on the standardization of the graduation design of tunnel and underground engineering through investigation and combining the teaching resources accumulated in the past decades.Through the study of practice,the content of undergraduate graduation design of tunnel and underground engineering is standardized,the breadth and depth of graduation design is defined,and the“Guide for undergraduate graduation design of tunnel and underground engineering”is organized and compiled,which can provide reference for the standardization and guidance of undergraduate graduation design of tunnel and underground engineering.
基金supported by the Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin(China Institute of Water Resources and Hydropower Research),Grant No.IWHRSKL-KF202016Natural Science Foundation of Hunan Province(CN),Grant No.2020JJ5732+3 种基金National Natural Science Foundation of China(Grant No.51679069)National Key R&D Program of China,Grant No.2017YFC1501100Open Fund of State Key Laboratory of Hydraulics and Mountain River Engineering(Sichuan University),Grant No.SKHL1725Water Conservancy Science and Technology Research and Extension Project of Shanxi Province,Grant No.2021LS034.
文摘Outwash deposit is one of the major threats to the safety and stability of railway transit engineering in the Sichuan–Tibet area.In this paper,different samples of outwash deposits were prepared based on the random structure method,and a series of large-scale direct shear tests were carried out under different normal stresses.The influence of stone content and the spatial distribution of stone blocks on the physical and mechanical properties of outwash deposits were studied.The results show that with the increase of stone content,the shear stress-displacement curve changs from strain softening to strain hardening.The shear zone is larger,and its shape is more tortuous due to the movement and rotation of stone blocks.The internal frictional angle increases linearly while the cohesion diseases with the increase of stone content.The main influence of the spatial distribution of stone blocks on the mechanical properties of outwash deposits is the peak stress.The shear zone is mainly determined by the distribution of the stone blocks near the shear zone.