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Volume 42 Issue 4
Nov.  2023
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Article Navigation >  CARSOLOGICA SINICA  > 2023  >  42(4): 834-841
GU Zhanfei, HUANG Bingyan, LIU Zhikui, QUAN Xin, XIE Yongxiong. Experimental study on the influence of vibration loads and temperatures on the dissolution of dolomite and limestone[J]. CARSOLOGICA SINICA, 2023, 42(4): 834-841. doi: 10.11932/karst202304y01
Citation: GU Zhanfei, HUANG Bingyan, LIU Zhikui, QUAN Xin, XIE Yongxiong. Experimental study on the influence of vibration loads and temperatures on the dissolution of dolomite and limestone[J]. CARSOLOGICA SINICA, 2023, 42(4): 834-841. doi: 10.11932/karst202304y01
shu

Experimental study on the influence of vibration loads and temperatures on the dissolution of dolomite and limestone

doi: 10.11932/karst202304y01
  • 1.

    College of Civil Engineering and Architecture, Guilin University of Technology, Guilin, Guangxi 541004, China

  • 2.

    Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Area, Nanning, Guangxi 530029, China

  • Received Date: 2022-09-08
  • Accepted Date: 2023-06-02
  • Rev Recd Date: 2022-09-21
    • Available Online: 2023-11-28
    Abstract
  • The dissolution of surface carbonate is a complex physicochemical process constrained by multiple influencing factors. In karst regions, due to the variations in mineralogy and chemical composition of the rock mass, differences in internal structure and pore characteristics, and the influence of external conditions such as the presence of groundwater, temperatures and vibration loads, limestone and dolomite exhibit differential dissolution patterns. Such differential dissolution often damages the completeness of the rock mass, affects its mechanical property and stability, and hence poses huge risk to the safety of buildings and structures on it. With the increasing strength of China's economy and the sustained promotion of development strategies in China's western region, many tunnels and underground engineering projects are being constructed, and the speed and frequency of train operation (high-speed trains and urban rail transit) are significantly increasing. However, the repeated vibrations during train operation can alter the degree and direction of water-rock interaction, leading to the continuous expansion of joints, fractures, and cavities within the rock mass. In addition, the impact of various external factors (temperature, climate, etc.) can accelerate this process, reduce the strength of limestone and dolomite, and thus pose hidden hazards to the safety of train operation. By the self-designed experimental equipment, this study investigates the dissolution behavior of dolomite and limestone in karst mountain areas of northern Guangxi under the influence of vibration loads and different temperature conditions. The experimental setup includes vibration equipment, a constant temperature chamber, a temperature controller, a flow meter, a pH meter, equipment for measuring Ca2+ and Mg2+ ions, and related drugs and reagents. Trains traveling between urban rail transit stations undergo three phases from acceleration to uniform and then deceleration, during which the vibration amplitude changes with the speed. Assuming a train departs every 8 minutes, horizontal and vertical vibrations will be generated during the operation, with vertical vibrations being the primary cause. In the laboratory, vibration conditions were controlled using a shaker sieve machine with an amplitude of 10 mm, a frequency of 2.5 times per second, and approximately 150 impacts per minute. A crossbar was fixed to the upper part of the sieve machine, and a fine cotton thread was used to tie the rock sample to one end of the crossbar to drive the sample vibration. The vibration was conducted every half an hour for 2 to 3 minutes. The results show: (1) Under normal temperature and pressure conditions, the dissolution rate of dolomite is lower than that of limestone in static acidic solutions. (2) With sufficient H+ under different temperature conditions (0℃ to 45℃), the dissolution rates of dolomite and limestone both increases with increasing temperatures, and the effect is more significant on dolomite. At 15℃, the dissolution rate of limestone is 2.496 times that of dolomite, while at 45℃, the dissolution rate of limestone is 1.150 times that of dolomite. (3) The dissolution of dolomite and limestone is strongly affected by vibration conditions and their dissolution rates increase with the increase of vibration frequency. Under the same vibration conditions, the dissolution rate of limestone is always greater than that of dolomite. Vibration loads have a greater impact on the dissolution rates of limestone and dolomite than other factors such as temperatures. This study provides a theoretical basis for engineering design and construction in karst mountain areas of northern Guangxi.

     

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