Abstract:The calculation of the pulling force of the bonded inner anchor head is a key problem in the engineering design of ground anchor. This paper makes a comprehensive analysis of the existing design calculation methods, and uses the calculation model and calculation program proposed in literature [7] to consider the common deformation of bolt, slurry and surrounding rock, and discusses the value of tangential stiffness coefficient of slurry and the influence of deformation modulus of rock and soil mass on the internal force distribution of anchorage section in the design of ground anchor.

Abstract:Nowadays, the geotechnical anchorage technology has been widely used in the world. Japan also uses a lot, because it is an island and earthquake-prone country. In this case, the technology of rock and soil anchorage is undoubtedly very important for strengthening engineering measures. So the geotechnical anchorage research is also very active. In this paper, the research on geotechnical anchorage in Japan is introduced.

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Abstract:The concept and method of external prestressing originated from France, but the early external prestressing system was not perfect, and there were defects in corrosion resistance, protection and structure. Therefore, the application of external prestressing in engineering can not show its superiority, which once made this technology stagnant. However, with the rapid development of unbonded prestressing and staying cables, the application of external prestressing system has brought vitality, especially in the last two decades, external prestressing system has been applied in a large number of projects abroad. The following are some representative projects in the development process of external prestressing system to illustrate, in order to have a further understanding of external prestressing.