(1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China；2. National Research Center for Dam Safety Technology，Wuhan，Hubei 430010，China；3. Changjiang Institute of Survey，Planning，Design and Research，Wuhan，Hubei 430010，China)
Abstract：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.
张家发1，2，胡智京1，2，孙云志2，3，崔皓东1，2 . 岩石软弱夹层的渗透变形特性研究及其方法探讨[J]. 岩石力学与工程学报, 2015, 34(S2): 4140-4148.
ZHANG Jiafa1，2，HU Zhijing1，2，SUN Yunzhi2，3，CUI Haodong1，2. STUDY ON SEEPAGE DEFORMATION CHARACTERISTICS OF INTERCALATED WEAK ROCK LAYER AND DISCUSSION ON RESEARCH METHODS. , 2015, 34(S2): 4140-4148.
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2015, Vol. 34 
