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Volume 39 Issue z2
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WANG Zheng-cheng, MAO Hai-tao, WANG Xiao-ju, HUANG Hai-jun, HU Hong-hao. Laboratory tests on erosion of overlying sand layer on shallow and strong permeable stratum in dike (dam) foundation[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(z2): 244-248. DOI: 10.11779/CJGE2017S2059
Citation: WANG Zheng-cheng, MAO Hai-tao, WANG Xiao-ju, HUANG Hai-jun, HU Hong-hao. Laboratory tests on erosion of overlying sand layer on shallow and strong permeable stratum in dike (dam) foundation[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(z2): 244-248. DOI: 10.11779/CJGE2017S2059
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Laboratory tests on erosion of overlying sand layer on shallow and strong permeable stratum in dike (dam) foundation

  • 1. College of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China;
    2. Institute of Water Conservancy and Hydroelectric Power, Wuhan University, Wuhan 430072, China;
    3. College of Environment, Hohai University, Najing 210098, China;
    4. College of Water Conservancy and Civil Engineering, Xinjiang Agriculture University, Xinjiang 830052, China

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  • Received Date: August 01, 2017
  • Published Date: December 19, 2017
    Graphical Abstract
    • Abstract
  • There is local shallow and strong permeable stratum in dike (dam) foundation, and its head dissipating capacity is weak. It is easy to cause piping failure, and the failure mechanism still needs further studies. The erosion of overlying sand layer on shallow and strong permeable stratum in dike (dam) foundation is simulated by sand tank tests, by changing water block stages, observing phenomena of fine particle loss in sand, obtaining parameters of seepage discharge, seepage gradient, grain composition of soils and cone resistance. The test results show that piping failure occurs in the sand layer on shallow and strong permeable stratum when the water block stage increases to 48 cm. The failure process is divided into stages of steady seepage, internal erosion of fine particles, internal erosion of relative fine particles and piping failure expansion. Besides, the fine particles in sand are lost, the cone resistance of dike (dam) foundation decreases, and the foundation settles. The porosity and permeability coefficient of sand increase when the fine particles are lost, and the seepage and stress fields have great change. The reseach results may offer theoretical reference for dick (dam) foundation which contains shallow and strong permeable stratum.
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    • References (10)
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