期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2020
卷号：558
期号：3
页码：1-12
DOI：10.1088/1755-1315/558/3/032020
语种：English
出版社：IOP Publishing
摘要：As an important part of the construction of hydropower stations, underground powerhouses are increasingly perfected and synchronized with their construction methods. Layered cutting and excavation methods have emerged at the historic moment. This article takes Wendeng Pumped Storage Power Station as an example, using theoretical analysis, numerical simulation and other methods to study the influence of the layered cutting method on the change of stress and strain of surrounding rock, and draws the following conclusions: (1) The cave is from the first floor to the first during the eight-layer excavation, the tensile stress of the side walls on both sides is symmetrically distributed and there is a maximum on the same layer, and the compressive stress reaches the maximum at the bottom plate; with the increase in the number of excavation layers, the tensile stress on the side walls on both sides increases first and then decrease, the surrounding rock compression stress of the vault and floor continue to decrease. (2) During the excavation of the cavern, the strain of the vault on the same floor reaches the maximum value, and the strain continues to increase with the increase of the number of excavation layers. The excavation of the eighth floor has increased to 4.94mm; The strain changes less with the increase of the number of excavation layers, and is always maintained at 2.50~2.75mm; the floor strain decreases layer by layer. (3) By comparing the on-site monitoring and numerical calculation data, analyze the changing trend of the on-site measured arch strain and the side wall stress around 2.50mm up and down, and calculate the difference ratio between the numerical simulation and the measured data. The excavation time difference ratio reaches the maximum value of 29.1%, which verifies the correctness of the simulation experiment and provides a supporting scheme for the underground powerhouse in harmony with the deformation law.
