Abstract
The underground caverns of Shuangjiangkou hydropower station are under complex geological conditions. During excavation, the stability of the tunnels is severely affected by problems, such as blasting impact and excavation unloading, resulting in abnormal deformation at different locations. On the basis of on-site measurement, the characteristics of rocks at the main powerhouse and the main transformer room are compared through dynamic tests, and a numerical model is established using discrete element method (DEM) to analyze the special influence of fault SPD9-f1 on the deformation after excavation. It is revealed that the surrounding rock of the main powerhouse has stronger impact resistance than that of the main transformer room and that the existence of fault SPD9-f1 accounts for the abnormal deformation. In this study, the failure characteristics and mechanism of surrounding rock deformation controlled by stress and fault are revealed, providing important references for the subsequent excavation and support design of underground projects.
Highlights
As an efficient and clean source of energy, hydropower plays an important role in the national electricity generation
Li et al [8] analyzed the deformation of a deep roadway with intercalated coal seam in roof according to the unique fracture mode by site detection; it was found that the low overall strength of coal seam in roof is the main reason for failure of self-bearing structure and loss of self-bearing capacity, Shock and Vibration which eventually led to failure of the surrounding rock
Hu et al [9] revealed the deformation of bedded rock in Wudongde hydropower station by means of field monitoring and numerical simulation; it was found that the deformation has a close connection with the dense of the bedding joint, and the excavation will trigger the activity of bedding joint, leading to the damage of the surrounding rock
Summary
As an efficient and clean source of energy, hydropower plays an important role in the national electricity generation. Li et al [11] analyzed the surrounding rock of Baihetan hydropower station and found that the deformation was large under the combined effect of high geostress and weak geological structure. Is article is organized as the following structure: Section 1 introduces the overall situation of the hydropower station, as well as the on-site monitoring data of surrounding rock deformation and depth of broken rock zone; Section 2 introduces the test results of dynamic compressive strength by SHPB system, wave velocity measurement is used to measure the damage of rock specimen after blasting excavation, and CT scanner is utilized to analyze the internal fissures in surrounding rocks in different loading rates.
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