Inquiry Announcement 1 Inquiry Conditions The Xizang TL Pumped Storage Power Station Dam Material Test Project has met the procurement conditions, and now the project is open for inquiry. 2 Project Overview and Scope of Inquiry 2.1 Project Overview: The Southeast Tibet (Yucha) Integrated Water, Wind, and Solar Base is one of the main river basin integrated water, wind, and solar bases in China. Zuogong TL Pumped Storage Power Station is an important regulating power source planned for the base, with a planned installed capacity of 2700MW. The power station is located in Zuogong County, Changdu City, Xizang Autonomous Region. The straight-line distance between the project area and the county seat is about 24km. National Highway G318 passes through 3km west of the lower reservoir, and is connected by simple roads. The traffic conditions are relatively convenient. The initial installed capacity of this project is 2700MW, which is a first-class large (1) type project. The main buildings such as water retaining and flood discharge structures, water conveyance systems, and underground powerhouses in the upper and lower reservoirs are classified as level 1, while the secondary buildings are classified as level 3. It has the characteristics of high dam height, narrow river valley, complex geological conditions, and being located in a high seismic intensity zone. The basic seismic intensity of the dam area is VIII, and the peak acceleration of the bedrock with a probability of exceedance of 2% and 1% in 100 years is 391gal and 474gal for the upper reservoir and 393gal and 477gal for the lower reservoir. 2.2 Service Content and Inquiry Scope: TL Pumped Storage Power Station recommends a concrete face rockfill dam as the water retaining structure for the upper reservoir, with a maximum dam height of 137m, and a concrete face rockfill dam as the recommended dam type for the lower reservoir, with a maximum dam height of 95m. It is necessary to conduct indoor tests on the dam materials to determine the reasonable grading range for the dam cushion layer area, transition layer area, upstream and downstream rock filling areas; Determine reasonable dry density and porosity for each partition; Understand the permeability characteristics of dam materials in each partition; Measure the compression modulus of dam materials in each partition and understand their compression deformation laws; Based on the results of indoor triaxial tests, assuming that the rockfill material follows the Duncan Chang nonlinear elastic constitutive model, the model parameters are obtained by organizing them according to the standard method, providing a basis for stress and deformation calculation and analysis of the dam body. This project is located in a high seismic intensity zone, with a basic seismic intensity of VIII in the dam area. The peak acceleration of the bedrock with a probability of exceedance of 2% and 1% in 100 years is 391gal and 474gal for the upper reservoir and 393gal and 477gal for the lower reservoir, which should be specifically verified. In order to master the engineering mechanical properties of the dam materials used in this project, provide a basis for predicting dam deformation, provide technical support for the design of the dam's anti-seepage system, and fully utilize the excavated materials of the building to make the TL energy storage project design technically feasible, economically reasonable, safe and reliable, it is necessary to conduct a series of tests on the physical properties, large-scale static and dynamic triaxial tests, rheological and wet dry cycles of the materials in each area of the dam. The main tasks of this project include: (1) conducting large-scale dynamic triaxial tests on dam materials; (2) Provide raw experimental data and preliminary conclusions. 2.3 Service Period: The planned submission date for this project is within 60 days from the date of contract signing. The specific time will be adjusted according to the sampling conditions on site. 2.4 The original records and preliminary conclusions of the results acceptance test shall be submitted in the form of paper reports and electronic files. The original records and preliminary conclusions shall have a complete list of editors and reviewers, handwritten signatures, and stamped with official seals. The project plan has been submitted