Abstract
The RFPA3D is used to establish a fine finite element model of 6.63 million elements, which realizes the fine simulation of the stability of the Xiluodu arch dam under layered, overall, multiworking conditions and multistress fields, and the cracking and failure process under overload. The structural design scheme of the arch dam and the corresponding foundation treatment design are evaluated. The model fully reflects the measures of dam shape structure design, angle fitting structure design, and foundation concrete replacement in the Xiluodu arch dam technical design stage. The RFPA3D adopts the mesoelement elastic damage model, which considers the Mohr–Coulomb criterion of shear fracture and the maximum tensile failure criterion, and assumes that the mechanical properties of the element satisfy Weibull distribution to consider its heterogeneity. The simulation results show that, under normal load conditions, the dam foundation surface after comprehensive reinforcement has better overall stability, the stress and deformation of the dam body have good symmetry, and the overload factor of crack initiation under overload calculation K1 = 2P0 (P0 is normal water load), the nonlinear deformation overload factor K2 = 3.5–4P0, and the limit load factor K3 = 7.5–8.0P0, dam safety can be satisfied. The RFPA3D is used to establish a superlarge fine model to study the overall stability of the high arch dam, which provides an effective method for analysis and research of other large hydraulic projects in the world.
Highlights
A series of major projects related to national economic construction in China, such as water conservancy and hydropower industry, tend to be large-scale, comprehensive, and complex
Concrete replacement: the replacement and backfill treatment are carried out for the interlaminar dislocation zone on the banks of the dam foundation at EL 510–610 m, grade IV1 rock mass exposed above the EL 560 m, grade IV 1 and class III2 exposed below the EL 560 m, the staggered zone in the interlayer between the EL 400–510 m and the strongly weathered interlayer, the grade IV1 rock mass exposed on the foundation surface, and the grade III2 rock mass exposed at the middle elevation and lower elevation of the foundation surface
Because the broken rock mass and dislocation zone C3 are exposed at EL 330.00–350.00 m on the left bank of the dam foundation, it is grooved. e strongly weathered interlayer in the middle dislocation zone of the P2βn layer is treated with a composite replacement plug. e exposed IV 1 and III 2 rock masses on the riverbed are treated by displacement excavation. e minimum excavation elevation is EL 324.5 m, and the depth is about 7 m. e depth of replacement excavation shall be adjusted locally according to the geological exposure of the site
Summary
A series of major projects related to national economic construction in China, such as water conservancy and hydropower industry, tend to be large-scale, comprehensive, and complex. In order to fully consider the nonlinearity and heterogeneity during the fracture process of rock or concrete, Tang et al proposed a new numerical simulation method “RFPA (Rock Failure Process Analysis) Method” [27,28,29,30,31,32,33] based on the basic theory of finite element, to explain the structural fracture process with statistical damage theory, and the basic principle of strength reduction method [34, 35] was introduced to analyze the stability of geotechnical engineering [36]. On the basis of fully reflecting the geological conditions after the actual excavation of the Xiluodu arch dam, the corresponding structural design and foundation treatment measures, the deformation and stress characteristics of the dam body, and abutment rock mass under several different load combinations are studied. Compared with the design requirements and acceptance standards, the rock mass quality of the riverbed under natural conditions is insufficient. erefore, it is necessary to strengthen consolidation grouting and adopt structural forms, expand the stress area of the foundation, and improve the homogeneity of rock mass and the stiffness of the foundation, so as to meet the requirements of dam construction
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