Abstract
This paper takes the cemented sand and gravel dam (CSGD) in Shoukoubao reservoir as the prototype to introduce in detail the similarity principle of model test and describe the selection steps of materials for CSG model. It has developed similar materials for CSGD model by mixing coarse sand, barite powder, gypsum powder, cement, and iron powder so as to provide reference for CSGD model test in the future. The dam model test has studied the stress distribution and displacement deformation of the dam during construction and normal operation, in order to provide experimental support for the study of failure mechanism of the CSGD and facilitate the design and construction of dams of this kind. The stress level of the body and the foundation of the model dam varied from 1/9 to 1/17 of the designed compressive strength of dam material. The results showed that CSGD is a safe new type of dams.
Highlights
Reservoir dams are the basis and carrier of water conservancy and hydropower development. ey play an irreplaceable role in the comprehensive utilization of water and hydropower resources. ey have increasingly important role in supporting the sustainable development of China’s social economy [1]
The mechanical parameters of the model material were tested systematically and comprehensively. e results showed that when the iron powder content was 10%, gypsum content was 20%, gypsum : cement 2 : 1, coarse sand : barite powder 3 : 1, and the material parameters of the model were closest to the test target value. e specific values and the test process are shown in Table 3 and Figure 1, respectively
As the water pressure was an additional factor during the normal operation period, the dam layers during the construction period were closely bonded with polymer cementing materials, and the whole load was applied to measure the stress and displacement of the dam foundation and the dam body
Summary
Reservoir dams are the basis and carrier of water conservancy and hydropower development. ey play an irreplaceable role in the comprehensive utilization of water and hydropower resources. ey have increasingly important role in supporting the sustainable development of China’s social economy [1]. Erefore, it is necessary to find an inexpensive solution so as to build a new type of dams that will not collapse even if overtopped. E application of CSGD in China began in 2004 in the upstream overflow cofferdam project of Daotang Reservoir in Guizhou Province. On June 7, 2019, the CSGD project of Jinjigou in Yingshan County of Sichuan Province was completed, with the maximum dam height of 33 m, indicating that this dam type began to be applied in permanent projects. Erefore, physical model test is an effective method to study the stress distribution of CSGD [13], in which similar material selection is the most important part [14, 15]. Compared with other research methods, physical model test has the advantage that the test conditions can be manually controlled and changed [12]. erefore, physical model test is an effective method to study the stress distribution of CSGD [13], in which similar material selection is the most important part [14, 15]. e model test data of cemented sand gravel is relatively scarce, and there are few reports on similar materials
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