Research and exploration on intelligent grouting technology has been conducted in some hydro-power stations in recent years. Intelligent grouting equipment has been invented and intelligent control strategies for conventional geological conditions have been developed. However, the existing technology lacks the intelligent control strategies for pressure sensitive and weak stratum, and is not suitable for grouting construction under complex geological conditions. Relying on the Xiong'an regulation and storage reservoir project and based on the empirical research method, this paper has carried out researches on new intelligent strategies for weak strata such as lift sensitive and split sensitive. The field test results show that the intelligent grouting technology meets the needs of field construction, in which the water pressure and grouting construction process can be intelligently completed, and the lifting and splitting situation can be handled. The research is conducive to ensuring the quality of grouting projects and improving the level of intelligent construction.

The mechanical effect of plant roots on soil is an important factor in improving the erosion resistance of slopes, and the relevant research on the impact resistance of plant roots under water flow at home and abroad is in a blank spot. In this paper, the common soil and water conservation plants tall fescue and dogtooth roots were selected as the research objects, and the jet erosion test was carried out on the slope of the plant model, and the erosion failure mechanism of the root slope of different species of plants was compared. The main conclusions are as follows: the variation law of the average erosion depth ΔD_AE of high fescue slope, dogtooth root slope and plain soil slope under different working conditions is similar and consistent, and it increases exponentially as a function with the increase of erosion flow velocity and linear function with the increase of erosion angle. The average erosion depth under various working conditions was generally as follows: high fescue< dog tooth root< plain soil; The average erosion depth of high fescue at each flow rate decreased slightly ΔD_AE slightly greater than that of dog tooth root. When the scouring angle was fixed, the ΔD_AE of each angle was the largest when the flow rate was 1.6 m/s, and the flow rate was higher than 1.6 m/s, and gradually decreased. When the erosion flow rate is constant, there is a decreasing tendency ΔD_AE increase with the increase of the scouring angle.

In order to explore the feasibility of using waste concrete to dispose expansive soil and make it as roadbed filler, the waste concrete and expansive soil were mixed evenly according to the ratio of 96 : 4, 92 : 8, 88 : 12, 84 : 16, 80 : 20 and 76 : 24. The boundary moisture content, linear shrinkage rate, expansion force and compaction tests were carried out. The influence of curing time was considered in unconfined strength and CBR tests to explore the improvement effect of the selected materials. The experimental results show that the liquid limit and plastic index decrease first and then increase with the increase of waste concrete content, and the minimum value appears when the content is 12 %, while the plastic limit increases slowly. The linear shrinkage rate increases first and then decreases with the increase of dosage, and the linear shrinkage rate is the smallest when the dosage is 12 %. The expansion force under different curing periods decreases slowly with the incorporation of concrete. When the dosage is 12 %, the dry density of the treated expansive soil is greater than that of the plain soil, and the optimum moisture content is less than that of the plain soil. Considering various factors, 12 % is determined as the best dosage. Under this dosage, the unconfined compressive strength of the mixed soil can reach the peak value, and the bearing capacity of the treated soil is about 5 times that of the plain soil. The treated expansive soil can be used as roadbed filler.

Considering the importance of reasonably setting water prices for water transfer projects in promoting the healthy operation and sustainable development of the projects, taking water resources allocation project around Beibu Gulf as an example, this paper put forward a new idea to calculate the water price. Firstly, the influencing factors of the project water price were identified through sensitivity analysis. And then through in-depth consideration of the value of each factor and its time change process, the calculated water price is low before and high after, which is realistic and easy to bear as well as conducive to the connection between the water transfer price and the current water price in the receiving area. The results show that the design parameters of water price scheme are reasonable and the calculation results are feasible. This study can provide a certain reference for the water receiving area government in the cost accounting and water price formulation of this project.

In the high proportion hydropower market, it is of great practical significance to establish a reasonable day-ahead quotation strategy for hydropower plants to ensure the effective participation of hydropower in the market. Firstly, the uncertainty of the clearing price of the system on the operation day was considering. Based on the identification of historical similar days, Gaussian process regression was used to establish the probability prediction method of the day-ahead clearing price. Furthermore, considering the revenue preference and risk aversion psychology of decision makers, and taking the maximum expectation of the hydropower plant's own power sales revenue as the goal, the day-ahead piecewise capacity optimization bidding method for cascade hydropower stations was constructed. Finally, the feasibility and effectiveness of the proposed method were verified by the simulation analysis of the day-ahead piewise capacity declaration of the actual cascade hydropower stations.

With the development of urbanization in China, secondary water supply has become a key part of urban water supply, but the utilization efficiency of water resources is low. This paper proposes the Demand Side Management (DSM) model based on the user's perspective. Starting from the user's Demand Side Management, the low water tank in the secondary water supply system at the end of the pipe network is taken as the research object. Using adaptive FCM clustering analysis and grey relational analysis, the paper analyzes the characteristics of user water use in different types of small areas, excavates the potential of regulation and storage and studies the peak-shifting scheme, and determines the appropriate peak-shifting scheme, so as to achieve good peak-shifting by demand-side management.

In hydro-generator units, the thrust bearing oil tank has the largest volume and the internal structure is relatively more complex. Therefore, there are many oil mists in the oil tank, and there are often internal and external oil spills, which have a great impact on the safe and stable operation of the unit. Based on the basic theory of computational fluid dynamics, the calculation model of thrust bearing in a power station was established, and the number of pressure oil blade was changed. The ICEM was used to mesh the three-dimensional model, and Fluent was used to calculate. The CFD-POST was used to analyze the oil mist related parameters of thrust bearing oil tank. The results show that in the design of hydro-generator units, the number of pressure oil blade can be appropriately increased, so as to increase the temperature difference between the upper and lower blades, reduce the oil temperature below the blade and increase the pressure, so as to better inhibit the occurrence of internal oil rejection and effectively prevent the diffusion of oil mist due to low pressure.

The Xiongan storage reservoir is a pumped storage reservoir, an important water source project supporting the construction and development of the Xiongan new area, and a key supporting project to ensure the safety of water supply in the new area, with high requirements for project seepage prevention. The F₁₇₃ fault, which is the largest fault in the reservoir basin, runs through the NE-SW direction, and forms low passes on the NE side and the SW side of the reservoir basin, and there is local dissolution along the fault. The lithology and structural sealing conditions of the reservoir are poor. In order to control the seepage of the reservoir, curtain grouting was used to prevent seepage around the reservoir. In order to explore a suitable implementation method for curtain grouting of Xiongan storage reservoir, it is necessary to determine the anti-seepage treatment measures, grouting construction method and construction technology of the F₁₇₃ fault through grouting test research. The results indicate that the permeability meets the anti-seepage standards and the fatigue resistance is improved.

Aiming at the nonlinear problem of regret value when regret theory is used to solve multi-attribute group decision making problems in hydraulic engineering, a multi-attribute group decision making method combined with grey correlation analysis method is proposed. Firstly, the regret theory was used to obtain the decision maker's perceived utility for each option and determine the regret decision matrix. Secondly, according to the nonlinear problem between regret values, the weight of attributes and the comprehensive regret value of each scheme were calculated by grey correlation analysis, and then the best scheme was obtained according to the ranking of the comprehensive regret value. Finally, the feasibility of the method was verified by case analysis. The results show that this method can solve the nonlinear characteristics and weight problems in regret theory, and make decision-making more reasonable when considering psychological factors.

The diversion tunnel plug is a key project for the safety of water conservancy and hydropower projects. Wedge-shaped plugs are widely used in engineering. There are many calculation methods for columnar plug, but not so much for the wedge-shaped plug. Based on the design scheme of the diversion tunnel plug in Karot power station, this paper carried out the theoretical and numerical simulation analysis. Through the force analysis of the wedge, the calculation method of the hydraulic pressure bearing capacity of the wedge-shaped plug was proposed. The comparative analysis of wedge and columnar plug safety was carried out by three-dimensional elastoplastic numerical simulation. The result shows that the maximum deformation under the calibration water level of the wedge-shaped plug was 0.8 mm, and its overload safety factor was 1.08 times that of the columnar plug. By comparing the numerical simulation with the formula calculation results, the rationality and accuracy of the calculation method for the bearing capacity of the wedge-shaped plug were verified. The research results have important guiding value for the design of wedge-shaped block.