On the afternoon of May 24th, Professor Li Tao from the Institute of Tunnel and Geotechnical Engineering at the School of Civil Engineering and Architecture, Beijing Jiaotong University, was invited by School of Urban Railway Transportation to give an academic lecture on the topic of Description Methods of Circular Plasticity and Elastoplasticity Mechanics of Cohesive Soil in Conference Room 8A521 of the Modern Transportation Engineering Center. This lecture attracted more than 20 teachers and students to listen, and was hosted by Professor Wang Lei, Vice Dean of School of Urban Railway Transportation.
At the beginning of the meeting, Vice Dean Hu Dingyu solemnly introduced Professor Li Tao and warmly welcomed his arrival on behalf of School of Urban Railway Transportation.
At the meeting, Professor Li first introduced the common types of dynamic loads in geotechnical engineering, explained in detail the effects of these dynamic loads on geotechnical foundations and underground structures, and pointed out the different requirements of different types of loads on the mechanical properties of geotechnical engineering. The stress-strain characteristics of rock and soil under cyclic loading were demonstrated through a large amount of experimental data. The stress-strain curves of saturated cohesive soil, sandy soil, and rock specimens under different cyclic loads were introduced, emphasizing the characteristics of nonlinearity, hysteresis, stiffness attenuation, and deformation accumulation, as well as the importance of critical dynamic stress under cyclic loading. Professor Li provided a detailed introduction to the development history and current research status of cyclic plastic constitutive models for soil. He discussed several major cohesive soil cyclic plastic constitutive models, such as the double yield surface model and the boundary surface model, and analyzed the modeling ideas and methods, key issues, and difficulties of soil constitutive models. Among them, Professor Li emphasized the application and multidimensional expansion of Masing method in the study of cyclic plasticity of cohesive soil, as well as the elastic-plastic double-sided models of saturated and unsaturated cohesive soil. He explained in detail the theoretical basis, modeling methods, and practical application effects of these two models, demonstrating their superior performance under complex load conditions.
Finally, Professor Li closely followed the engineering requirements and introduced the latest research achievements of the team in this direction. During the interactive questioning session, teachers and students actively asked questions and had in-depth communication with Professor Li. At the same time, he also encourages young scholars to continue working on improving cyclic plasticity and elastoplastic mechanics models, and exploring their applications in more complex geological conditions and engineering environments. The on-site interactive communication and lively atmosphere of this academic lecture not only enhanced the professional awareness of teachers and students, but also opened up new academic horizons for students, injecting new impetus into promoting cross disciplinary cooperation between the transportation profession and various disciplines.
It is reported that Professor Li Tao holds a PhD in Engineering from the University of Kaiserslautern in Germany, and is a professor and doctoral supervisor at the Engineering Center of the Ministry of Education for Tunnel and Underground Engineering at Beijing Jiaotong University. He is currently a member of the Rock Dynamics Special Committee and the Waste Underground Disposal Special Committee of the Chinese Society of Rock Mechanics and Engineering. I am also a member of the Soil constitutive relationship and strength theory Special Committee of the Soil Mechanics and Foundation Engineering Branch of the Chinese Society of Civil Engineering. I am an expert in the National Natural Science Foundation project review and the National 863 Expert Database. Professor Li has a profound theoretical foundation and rich practical experience in the fields of soil mechanics, foundation engineering, and environmental geotechnical engineering. For many years, he has been dedicated to the study of elastoplastic constitutive models of soils and experimental and theoretical research on the mechanical properties of unsaturated soils. I have presided over and participated in more than 30 national, provincial, ministerial, and social service research projects, including one project from the National 973 and 863 Programs. Received one second prize of the National Science and Technology Progress Award, three provincial science and technology progress awards (one special award, one first prize, and one second prize each), one second prize of the Natural Science Award for Excellent Scientific Research Achievements in Higher Education Institutions of the Ministry of Education, and seven other provincial and ministerial level industry association science and technology progress awards; Write and publish over 100 academic papers of various types; Trained over 80 doctoral and master's students in total.