With the support of the the Pearl River Team's Project "Theory and Technology of Engineering Disturbed Rock Dynamics" (2019ZT08G315), Shenzhen University successfully developed the world's first set of "dynamic true triaxial electromagnetic Hopkinson bar test system". On December 28, 2024, the China Coal Industry Association organized an evaluation of the results of the the Pearl River team project "Dynamic true triaxial electromagnetic Hopkinson pole test system" led by Academician Xie Heping, and invited 29 well-known experts at home and abroad, including 11 academicians of the Chinese Academy of Sciences and the Chinese Academy of Sciences and 2 overseas academicians, to attend the evaluation meeting.
Ou Jinping, an academician of the CAE Member, served as the director of the achievement evaluation meeting, and Yuan Liang, an academician of the CAE Member, and Wei Yueguang, an academician of the CAS Member, served as the deputy directors; Zheng Quanshui, academician of the CAS Member, Kang Hongpu, Chen Xiangsheng, Lin Jun, Li Shucai, Yang Chunhe, Wu Aixiang, Wu Qiang, academician of the CAE Member, Zhang Zhiliang, academician of the Norwegian Academy of Technology, Zhou Yingxin, academician of the Singapore Academy of Engineering, Zhao Jian, professor of Monash University in Australia, Liu Feng, chairman of the Chinese Coal Society, professor Yang Renshu, president of Beijing University of Science and Technology, researcher Li Haibo, president of the Chinese Academy of Sciences Wuhan Branch, professor Ma Hongwei, president of Dongguan Institute of Technology, professor Lu Yiyu, vice president of Chongqing University, professor Tang Chun'an, professor of Dalian University of Technology, professor Wu Yongping of Xi'an University of Science and Technology, professor Li Xibing of Central South University, Ju Yang, Professor of China University of Mining and Technology (Beijing), Li Jianchun, Professor of Southeast University, Wang Guiji, Researcher of China Academy of Engineering Physics, Xia Kaiwen, Professor of China University of Geosciences (Beijing) Professor Liu Yiping from South China University of Technology and Researcher Zhang Lei from the Third Research Institute of the General Staff Engineering Corps serve as committee members. The evaluation meeting will be chaired by Cao Wenjun, Minister of Science and Technology Development Department of China Coal Industry Association.
The expert group conducted on-site inspections and listened to Academician Xie Heping's introduction on the development of the "Dynamic True Triaxial Electromagnetic Hopkinson Bar Test System". After six years of unremitting research and development, the team has achieved breakthroughs in principle conception, technical breakthroughs, and equipment research and development from scratch. They have independently created the world's first dynamic true three-axis electromagnetic Hopkinson bar test system. The expert group carefully reviewed the relevant materials, and after questioning, discussion, and evaluation, unanimously agreed that the achievement has filled the global technological gap in this field, achieved significant technological breakthroughs, and overall reached the international leading level.
At present, the number of major rock engineering projects worldwide is increasing, the burial depth is getting deeper, and the construction difficulty is increasing. During the construction and operation process, the engineering disturbance is strong, and the engineering safety is facing huge challenges. However, the design and analysis of major engineering construction and operation often rely on traditional theories and methods, often making dynamic problems static and failing to fully consider the impact of dynamic disturbances from various construction and operation conditions on engineering response, posing significant risks to the safety of engineering construction and operation. During the construction and operation process, dynamic disturbances often exhibit multi axis and multi-directional characteristics. However, there is currently a lack of dynamic testing methods and theoretical analysis systems internationally that reflect this real engineering state, especially the three-dimensional multi-directional rock dynamic testing methods, technologies, and devices, which are a world blank.
In response to this global challenge and technological gap, Academician Xie Heping has taken the lead in proposing the innovative development concept, principles, methods, and technical solutions of the "Dynamic True Triaxial Electromagnetic Hopkinson Bar Test System" internationally. After six years of scientific research and development, the world's first "Dynamic True Triaxial Electromagnetic Hopkinson Bar Test System" with completely independent intellectual property rights has been successfully developed. The system creatively developed the world's first dynamic true three-axis electromagnetic Hopkinson bar test system. The main body control method and technology of the dynamic true three-axis electromagnetic Hopkinson rod are proposed, and the three-axis six direction Hopkinson rod and the sample positioning alignment and control, the three-dimensional middle note with the pulse gun, the three-dimensional center adjustment support device of the waveguide rod, and the energy absorption buffer and self resetting device of the multi axis and multi direction dynamic static coupling loading are developed, realizing the three-dimensional high-precision and rapid accurate control of the middle note of the three-axis six direction Hopkinson waveguide rod, the sample and the pulse gun. We have completed the first three-axis six directional dynamic loading and multi axis multi-directional dynamic static coupling loading test, filling the gap at home and abroad.Pioneering the method, technology, and device of three-axis six directional electromagnetic stress pulse loading. We have created a unique three-axis six directional electromagnetic stress pulse generator device, which forms a synchronous and coordinated control method for three-axis six directional electromagnetic stress pulses based on frequency division triggered current sharing discharge and transient high current protection technology. We have solved the world problem of large error and low waveform repetition when stress waves are loaded, and achieved the adjustability (amplitude range 0-600MPa, pulse width range 300-800 μ s), controllability (time error ≤ 5 μ s), and repeatability (repetition rate>99%) of three-axis six directional electromagnetic stress pulses. Pioneering the method, technology, and equipment of three-axis six directional dynamic static coupling loading. We have developed a multi axis multi-directional dynamic static coupling loading conversion control method, technology, and device, breaking through the technical bottleneck of high-precision coupling between true three-axis static loading system and three-axis six directional dynamic loading system, and achieving multi axis multi-directional dynamic static coupling loading of static confining pressure and electromagnetic stress pulse. Research and development of multi-dimensional dynamic real-time data collection and analysis methods and equipment. A strain signal acquisition method resistant to strong electromagnetic interference was proposed for the entire process of strain signal acquisition. A three-dimensional displacement field real-time evolution observation and analysis device was independently developed, which overcame the observation limitations of the three-axis six directional dynamic static coupling loading system and achieved real-time evolution analysis of the three-dimensional displacement field under dynamic static coupling loading.
The achievements of this project have filled the gap in international three-dimensional rock dynamics testing methods, providing new methods, means, and platforms for the theoretical research of engineering disturbance rock dynamics. It will establish multidimensional and multi-directional dynamic (static) mechanics new theories and methods for the exploration of basic disciplines such as mechanics, physics, high-pressure geology, seismology, materials science, and space science. It will also provide technical support for the exploration of dynamic disasters in engineering fields such as mining engineering, geological engineering, underground engineering, civil and water conservancy engineering, and national defense engineering, and help China achieve strategic goals such as high-level scientific and technological self-reliance and the development of new quality productivity.
