Abstract
The analysis of the reservoir-dam-foundation coupled system is much more complicated than that of the structure alone because of the difference between the characteristics of the foundation and concrete dam. The small hydraulic structure may be built in seismically active regions, where ground movement would impose earth pressures. The safety of these structures should be investigated quite critically by logical and precise methods. Rawanduz dam subjected to EL-Centro earthquake-S00E component excitation was chosen as a typical case of study. The static and dynamic stability of the Rawanduz dam had been analyzed and evaluated. A 2-D Finite Element model employed using ANSYS software to simulated dam response. The water was modeled as an additive mass according to the theory of Westergaard on the back of the dam while leaving the rest of the reservoir inactive. The dam body is presumed homogeneous, elastic, and isotropic properties for mass material. The soil was assumed to be flexible and analyzed as a nonlinear material. When assessing the stability of the structure under the influence of the seepage loads, the structure was founded safe because the exit gradient value was equal to (0.25), which was less than the critical value of the exit gradient (1/6). Results showed that the principal stresses at the heel and toe of the dam were founded important to study the stability. The static and dynamic analysis findings indicate that the stress values are very low, hence satisfy the normal criteria for protection factors relating to the tensile and compressive strength of the concrete.
Highlights
The design of the systems of small hydraulic structures depends on the specifications and functions of concrete dams such as supplying the water, flood control, generate electric power.The hydraulic structure might be built in seismically active zones, where ground shaking could put them under a lot of pressure
The Baozhusi Dam, located in China, suffered structural damage that led to cracks inside the dam body due to the earthquake that struck the city in 2008 [1]
Due to the noticeable increase in the number of earthquakes in world, the stability of small hydraulic structures has emerged as a major research area
Summary
The design of the systems of small hydraulic structures (such as wires and small concrete dams) depends on the specifications and functions of concrete dams such as supplying the water, flood control, generate electric power. Failures of the small hydraulic structures under static and earthquake loads could cause loss of. Hamdi and Al-Shadeedi [2] was studied the stability of the hydraulic structure under the influence of the seismic load. Khan and Sharma [4] studied the stability of a structure with the intersecting galleries unplugged. They presented the stress analysis of the maximum overflow block of a 13m high concrete gravity dam, which has an intersection of cut‒off wall gallery and access gallery. The main purpose of the research is to assess the stability of a hydraulic structure under the influence of static and dynamic load. In order to assess the stability of the hydraulic structure, the linear time-history analysis was used as the input ground motion
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