Abstract
In the past, when performing dynamic response analysis of dams on deep overburden, the dam body and the overburden have often been discussed separately. In this paper, the overburden and the dam body are considered as a whole, and the dynamic response analysis is carried out by using a completely nonlinear dynamic analysis method. From the acceleration of the earth’s surface, the displacement of the dam, and the stress distribution of the panel, the dynamic response of the structure is shown to increase first and then decrease with increasing cover thickness, and the overburden layer thickness corresponding to the extreme point is called the critical thickness. The results obtained in this study can provide a design basis for a face rock-fill dam built on a deep overburden layer.
Highlights
With the development of China’s economy and the implementation of western development, construction of water conservancy projects has progressed rapidly
The main conclusions are as follows: 1) The presence of overburden will affect the dynamic characteristics of the input seismic wave so that the acceleration amplitude of the ground surface increases
The overall trend is to first increase and decrease, so the thickness of the coating corresponding to the maximal value of acceleration magnification is called the critical thickness
Summary
With the development of China’s economy and the implementation of western development, construction of water conservancy projects has progressed rapidly. It is necessary to perform dynamic analysis of a high earth-rockfill dam on deep overburden. Some scholars have studied the influence of overburden thickness on seismic response. Scholars use one-dimensional equivalent linear wave method to calculate seismic reflection of homogeneous soil [8]. The one-dimensional equivalent linear wave method has the advantages of clear concept and few calculations, it cannot truly reflect the propagation of seismic waves in soil [9, 10]. In this paper, referring to the actual situation of a proposed water conservancy project in the west, dynamic response analysis of a concrete-facing rock-fill dam with different cover thicknesses is carried out by establishing a three-dimensional model [12]. The. ANALYSIS OF OVERBURDEN LAYER THICKNESS INFLUENCE ON DYNAMIC RESPONSE OF CONCRETE FACE ROCK-FILL DAM. The seismic response analysis of the dam is explored from three aspects: the acceleration of the site, the permanent deformation of the dam body, and the safety of the seepage control body [15, 16]
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