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Article Navigation >  CARSOLOGICA SINICA  > 2024  > Accepted Manuscript
ZHONG Zhibin, FENG Jie, LV Lei, ZHOU Qijian, LI Sijia, XUE Changrui. Experimental study on static and dynamic water dissolution characteristics of red layer gypsum interlayer[J]. CARSOLOGICA SINICA. doi: 10.11932/karst2024y046
Citation: ZHONG Zhibin, FENG Jie, LV Lei, ZHOU Qijian, LI Sijia, XUE Changrui. Experimental study on static and dynamic water dissolution characteristics of red layer gypsum interlayer[J]. CARSOLOGICA SINICA. doi: 10.11932/karst2024y046
shu

Experimental study on static and dynamic water dissolution characteristics of red layer gypsum interlayer

doi: 10.11932/karst2024y046
  • 1.

    Chengdu Third Construction Engineering Co., LTD., Chengdu 610056, China

  • 2.

    State Key Laboratory of Geological Hazard Prevention and Geological Environment Protection, Chengdu University of Technology, Chengdu 610059, China

  • 3.

    Chengdu Jiangong Road and Bridge Construction Co., LTD., Chengdu 610073, China

  • 4.

    Southwest China Institute of Architectural Survey and Design Co., LTD., Chengdu 610093, China

  • 5.

    Power China Chengdu Survey, Design and Research Institute Co., LTD, Chengdu 610014, China

  • 6.

    China Railway Shanghai Engineering Bureau Group Co., LTD, Shanghai 200436, China

  • Received Date: 2023-12-07
  • Accepted Date: 2024-11-04
  • Rev Recd Date: 2024-09-16
    • Available Online: 2024-12-30
    Abstract
  • Gypsum interlayers with uneven thickness are widely distributed in the red layer sand and mudstone in Sichuan Basin. In the process of groundwater infiltration or erosion, these gypsum interlayers will inevitably produce dissolution reaction and form a large number of holes. Coupled with the special physical and mechanical properties of red layer, it is easy to reduce the bearing capacity of foundation, uneven settlement deformation and even damage of engineering structures. Therefore, it is necessary to carry out more in-depth research on the dissolution characteristics of gypsum interlayer in red layer.Based on an avionics hub project in Chongqing, this paper takes the gypsum sandwich rock at dam foundation as the research object, and uses a self-designed dynamic water dissolution device to carry out the dissolution test. The dissolution process of gypsum in the test can be characterized by regularly monitoring the concentration changes of $ {\mathrm{C}\mathrm{a}}^{2+}\mathrm{、}{{\mathrm{S}\mathrm{O}}_{4}^{2-}} $ ions in the solution. The dissolution characteristics of gypsum interlayer in red layer at different flow rates were investigated.At the end of the test, different degree of dissolution grooves appeared in the gypsum interlayers under different flow conditions. Among them, the grooves on the surface of the sample with static water corrosion are the smallest, only 2~3mm, while the grooves produced by sample corrosion in the moving water environment reach the deepest 12mm. It can be found that the dissolution rate of gypsum in the moving water environment has been greatly improved. The concentrations of $ {\mathrm{C}\mathrm{a}}^{2+}\mathrm{、}{{\mathrm{S}\mathrm{O}}_{4}^{2-}} $ in the solution were measured after the test, and it was found that the contents of both ions showed an increasing trend with time. Comparing the results of hydrostatic and dynamic water dissolution tests, it can be seen that the slope of $ {\mathrm{C}\mathrm{a}}^{2+} $ content change curve of experimental groups increases gradually with the increase of flow velocity, indicating that higher flow velocity has a certain promotion effect on the chemical dissolution of gypsum. Through the processing and conversion of the test data, it can be found that the average dissolution rate under different flow velocity environment shows a rapid decline in a short time, and then gradually tends to be stable. At the initial time of the corrosion test, the average chemical corrosion rate of the samples under different flow rates showed that the faster the flow rate, the greater the corrosion rate. With the experiment, the dissolution rate decreases rapidly and the decreasing trend in different flow velocity environments is different to some extent. The greater the flow velocity is, the greater the dissolution rate is. Compared with the dynamic water corrosion test, the average chemical corrosion rate of the samples in the static water environment is smaller in both value and range. Combined with the change curve of the average chemical dissolution rate of each sample, it can be found that the average dissolution rate of gypsum increases with the acceleration of the flow rate, which proves that the larger flow rate plays a role in promoting the dissolution of gypsum interlayer. The trend of instantaneous chemical dissolution rate curve of each dynamic water dissolution test group was basically consistent with the trend of average chemical dissolution rate curve, showing a law of decreasing with time, and all curves showed a sudden drop on the third day of the test, and then gradually decreased and tended to be stable. According to the curve of the dissolution amount of each sample with the flow rate, it can be found that the chemical dissolution and mechanical submergence of gypsum interlayer will be strengthened when the flow rate increases.

     

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