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Volume 28 Issue 6
Dec.  2015
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Article Contents
Journal of Southwest Jiaotong University  > 2015  >  28(6): 1061-1066.
WANG Zhen, SHEN Mingrong, LIU Ang. Water-Rock Interaction Characteristics and Softening Mechanism of Calcareous Mudstone[J]. Journal of Southwest Jiaotong University, 2015, 28(6): 1061-1066. doi: 10.3969/j.issn.0258-2724.2015.06.012
Citation: WANG Zhen, SHEN Mingrong, LIU Ang. Water-Rock Interaction Characteristics and Softening Mechanism of Calcareous Mudstone[J]. Journal of Southwest Jiaotong University, 2015, 28(6): 1061-1066. doi: 10.3969/j.issn.0258-2724.2015.06.012
shu

Water-Rock Interaction Characteristics and Softening Mechanism of Calcareous Mudstone

doi: 10.3969/j.issn.0258-2724.2015.06.012
  • Received Date: 15 Dec 2014
  • Publish Date: 25 Dec 2015
    Abstract
  • In order to deeply research the softening mechanism of soft rock after interaction with water, cretaceous calcareous mudstone, water softening rock from a water diversion tunnel in Guyuan City, Ningxia Hui Autonomous Region, was investigated by the analysis of its mineral compositions and the test of its physical-mechanical properties. Based on the test results, the water-rock interaction characteristics of calcareous mudstone were analyzed, and variation rules of strength and deformation parameters with clay mineral content were discussed. The research results show that swelling and strength of calcareous mudstone decay rapidly after water invading. There exist natural logarithmic relationships between variations of mechanical parameters and clay mineral content. The water softening of calcareous mudstone is caused by the internal hydration swelling reaction of rock and its damage intensifying in the circulation process of water absorbing and water losing, and the softening mechanism can be described in details with the schematic diagram of water-rock interaction process.

     

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