Claim opportunity identification is the key part of claim management. This paper focuses on the application of cost and schedule analysis to international projects. Combined with theoretical analysis and case study, the paper elaborates claim opportunity identification.

The open-hole type is generally used to monitor water pressure in the body of earth-rock dam,the lag effect of water level in the hole can’t be ignored in data analysis.There are several ways in data analysis,this article sums up some ways of qualitative analysis,and describes the different represent when the dam seepage is out of the way.

Double- metal marks were usually used as the base point of vertical displacement measurement of dam. This article discussed the factors that affect its running, such as design and installation, and then put forward some methods for improvement and advice on structure, worthy reference to designer, construction company and equipment company.

The destructive power of flood discharging rain and fog is so great that many accidents happened such as downstream traffic block, damage of electrical equipments, outage of power generators and flooding of power house.As well, penetration of the rain and fog induced large-scale downstream landslide of slope.To prevent any more damage, reasonable layout and related protection measures was critical in design, and prototype observation should be strengthened in operation． Practice showed that the reasonable opening of gate was an important non-engineering measure to decrease and prevent the influence of flood discharging rain and fog．

In this paper, it is analyzed that the stress distribution and change of the spiral case of the No.19 hydraulic turbine set in right powerhouse during the different conditions (the press mantling, the constant temperature and pressure, the press dismantling, the electricity generation), and the change rule of the spiral case is studied in the whole process. The stress change is allowed in the design. To one measuring point as an example, using it＇s monitoring data, regressive model to forecast the stress of the spiral case under the normal water level is set up.

Filling method for embankment is of low cost, high efficiency and speed. However, as restrictions of poor bearing capacity in soft soil ground, its application in reclamation project is much less. According to the actual condition of Wenzhou shoal, combined with the construction in east polder dike project, this paper introduced some details about hydraulic filling. Further, experience such as how to control the load and resist the comprehensive interference of wind, wave and tide by sand pipes and bags and so on were presented, and the feasibility of application of hydraulic filling in complicated conditions was verified, worthy popularization.

Leakage is common for reservoir dams which not only affects the project benefits, but also causes serious hidden risks, can even lead to a dam break. Locating the leakage and its passage is the basis for further treatment which is key to ensure the safe operation of reservoir dams. At present, there are many leakage detection methods with their own applicability and limitations, and are restricted by site condition, environmental condition and geological conditions. Suitable methods should be selected based on method characteristics and site conditions, to achieve better detection effect.

The emergency gate of No.2 inlet of Changhu Hydropower Station occurred four accidents of gate drop in flood season since it has been put into operation in 1970 which resulted in destroying the arm and hoist facilities and influenced the unit’s normal operation. Therefore, we have been authorized to have gate tested dynamically. This paper briefly introduced the accidents and test effect. It also briefly analyzed the cause of accident according to check result.?

This paper introduced the damage caused by earthquake of Bikou dam, as well as the operation and safety monitoring after earthquake. Further more, the issues need attention in design of damlocated in earthquake area were pointed out here.

The new developments the dams and reservoirs are facing have been stated in this paper. Moreover, the technology of risk assessment and risk management appling to dam and reservoir safety are introduced, particularly for small reservoirs.Finally, the authors pay much attention to the monitoring technology for flood-control and disaster reducing and water resources.

This paper has analyzed the development trend of dam safety management in hydropower stations in the future based upon the problems existing in the procedure of management.

At the beginning of operation of the Fengman dam, it seeps seriously. The max. measured leakage quantity reached 16 380 L/min. The grouting have been taken for many times near 60 years to Fengman dam so as to treat the leakage and to reduce the uplift pressure of the dambody. This article summarized all previous grouting situations.

Based on comprehensive qualitative analysis of monitoring data of Qingxi dam foundation uplift pressure, statistical models of dam foundation uplift pressure were established, components of typical years' variation were separated.Further more, changes of monitoring items and influencing factors were analyzed.Therefore comprehensive analysis and evaluation of varying state of uplift pressure are made.

Combined with dam safety evaluation and operation, by calculation on some indexes and boundary condition, this paper analysed the seepage and stability of Qinghe reservoir dam.The result showed that the dam was safe and stable.

There were some differences between expansion and new construction projects. This paper, combined with the expansion of large concrete masonry gravity dam on Yingna river, introduced some key technical points such as design and optimization of the diversion, excavation, the treatment of interface and temperature control, for reference.