Study on Stress and Deformation of Plastic Concrete Cutoff Wall at Deep Foundation Pit of Shawan Hydropower Station

Experiences in construction organization and quality control of remedial diaphragm wall for the first stage cofferdam at Shawan hydropower station in Leshan in Sichuan province are presented in this paper.

<Abstrcat>Combining depth-averaged numerical seepage flow model and 2-dimensional profile seepage flow model, seepage rate, seepage velocity field and hydraulic gradient of seepage control work in left abutment of Shawan hydropower station have been obtained.

Through process quality control of the plastic concrete diaphragm wall of the first stage cofferdam at Shawan hydropower station on Dadu River , some experiences are enhanced for similar projects .

Countermeasures for slope perils on the left bank in Manwan Hydropower Station;

Analysis of the spatial-temporal characteristics of R value in the storage areas of Manwan Hydropower Station may supply good advices to prevent soil erosion effectively in local region.

Stability analysis of high inlet slope for Xiaowan Hydropower Station;

In the Feasibility Report of Xiaowan Hydropower Station,construction schedule will be much slowed down due to more orifices in the dam body,reservoir filling will start 12 years later after the construction of reservoir has begun.

Prior to the joint grouting work of the Xiaowan hydropower station,we conduct indoor and On-site slurry performance tests which provide scheme and basis for the construction.

In this paper, coupling of stress and seepage fields at the damsite area of the Xiaowan hydropower project is analyzed, and the fractal effect of rock fractured surface on the seepage flow in fractured rock masses is studied by means of numeric simulation of single fracture permeability.

To solve the powerhouse intake high slope stability problem for the Xiaowan Hydropower Project a further comprehensive study was made based on the results of rock mass classification, sampling of soft seams, test and analysis, shearing plane network simulation and slope stability limit analysis developed in the early stage study .