National Research Center for Dam Safety Technology

Wuhan, China

National Research Center for Dam Safety Technology

Wuhan, China
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Zhang J.,Yangtze River Scientific Research Institute | Zhang J.,National Research Center for Dam Safety Technology | Hu Z.,Yangtze River Scientific Research Institute | Hu Z.,National Research Center for Dam Safety Technology | And 4 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

Seepage deformation test methods for intercalated weak rock layer are not very matured, and there is not code for the test. Seepage deformation test and its results are presented for disturbed/undisturbed samples from faults F41 and F42 at the site of Chipwi Hydropower station planned for the upper Ayeyawdy River, mainly following the test code for soil. The results indicate that disturbed samples fails as soil flow without apparent deformation process, and the permeability differences among samples are not great. Undisturbed sample tests performed in a temporary laboratory set up at site reveal different characteristics. Main deformation is washing fine and soft mass out. Washing or local soil flow results in failure. Critical gradient is rather lower than failure gradient. Measured values are greater than that from disturbed sample tests, because undisturbed samples remain inhomogeneous internal structure and the contact status between weak layer and surrounding rock. Comparing with test results of disturbed samples, results of undisturbed samples reveal better the seepage deformation characteristics of the faults. On the basis of the test results and previous studies for other projects, test methods and the ways to apply the results are discussed. Suggestions include that integrating microscopic, meso-scopic and macroscopic study methods to reveal the seepage deformation mechanism further, taking numerical simulation to improve in-situ tests, and allowable gradient being set according to the seepage deformation process in addition to measured values with suitable safety factor corresponding to the location and harmfulness of the intercalated weak layer. ©, 2015, Academia Sinica. All right reserved.

Zhang J.,Yangtze River Scientific Research Institute | Zhang J.,National Research Center for Dam Safety Technology | Wang J.,Yangtze River Scientific Research Institute | Wang J.,National Research Center for Dam Safety Technology | And 2 more authors.
Journal of Earth Science | Year: 2016

Asphaltic concrete core (ACC) dams are widely built in China. Many ACC dams perform well, but others have experienced significant leakage including the case in western China studied herein. A numerical model of saturated-unsaturated water flow was adapted to simulate the seepage through the dam. By comparing the normal and abnormal seepage fields under different conditions, the main causes for the actual abnormal seepage field were identified and attributed to a defect in the ACC and an unintended, low permeability layer (LPL) in the transition zone (TZ) and the downstream dam shell. These conclusions are consistent with the situation and performance of the dam. Inadequate ACC construction processes might have caused defects in the ACC. An abrupt change of the ACC thickness probably induced stress concentrations and caused the ACC to fail. Material sources for the TZ and dam shell were complex and varied from specifications, and soil gradation for the TZ was inadequately controlled. In particular, tests show that the permeability varies over large ranges in these two parts of the dam. An unexpected LPL probably exists in both areas, and extends continuously. © 2016, China University of Geosciences and Springer-Verlag Berlin Heidelberg.

Guo W.,Yangtze River Scientific Research Institute | Guo W.,National Research Center for Dam Safety Technology | Guo W.,Chinese Ministry of Water Resources | Wang S.,Yangtze River Scientific Research Institute | And 5 more authors.
Advances in Science and Technology of Water Resources | Year: 2013

In order to study performance testing methods suitable for alkali-free liquid concrete accelerators, performance testing tests of concrete accelerators were carried out with JC 477-2005 (building materials standards of China) and TGPS · T 31-2005 (Three Gorges group standards making reference to the European standards). The performance data of alkali-free liquid concrete accelerators obtained from the two testing standards were compared from the setting times of accelerators and compressive strength ratio of cement mortar, etc. The results show that setting times obtained by the two performance testing standards are a little different when the proportion of the JC 477-2005's accelerator is increased by about 2%. The late strength growth performance of cement mortar with alkali-free liquid accelerators can be better reflected by the 90 days' compressive strength ratio of TGPS · T 31-2005. The compressive strength of cement mortar with alkali -free liquid accelerators is positively proportional to the age.

Zhu G.-S.,Yangtze River Scientific Research Institute | Zhu G.-S.,National Research Center for Dam Safety Technology | Cui H.-D.,Yangtze River Scientific Research Institute | Cui H.-D.,National Research Center for Dam Safety Technology | And 4 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

The seepage control measures are the main items for the design of the dam and underground powerhouse caverns of Wudongde Hydropower Station. A refined 3D finite element model is established to simulate the complicated seepage control measures and geological conditions for the dam foundation and the underground hydropower cavern area at the right bank of Wudongde Hydropower Station. The numerical results show that the integrated measures composed of curtains and drainage hole rows will control the water flow from the reservoir and mountain area efficiently. The powerhouse cavern walls will be above the ground water surface. If the permeability is stronger along bedding in thick limestone and dolomite layer, the seepage control system will work more efficiently, but the flux from drainage holes increases obviously.

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