The Mechanical Properties of Different Soil Moisture Content of Silt Study Based on the Experimental

Zhang, Xun Zhong; Wang, Ru Heng; Jia, Baohua

doi:10.4028/www.scientific.net/amm.665.217

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“…In engineering construction in karst development areas, all types of karst engineering geological problems are encountered, such as reservoir and dam karst leakage, karst dam foundation and slope problems. The karst sanding of dolomite decreases the strength of rock mass, reduces the quality of rock mass and significantly affects the stability of slopes and underground chambers as unfavorable geological boundaries [1][2][3]. Therefore, the study of various properties under the dissolution conditions of dolomite is extremely important, and Wiederhorn et al [4] have studied the influence of pH on glass crack propagation as early as 1973.…”

Section: Introductionmentioning

confidence: 99%

Study on the Microstructure Evolution and Strength Damage Mechanism of Dolomite under Dissolution Condition

Liu

et al. 2022

Sustainability

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Dolomite is a common type of natural soluble rock. The strength of rock decreases under the action of corrosion, which has a significant impact on the self-stability and long-term safety of the tunnel surrounding the rock. To reveal the microscopic structure evolution and strength-damage law of carbonate rock caused by chemical corrosion, a series of tests such as rock chemical corrosion test, rock uniaxial compression test and electron microscope scanning test are conducted at different pH values on the dolomite of the Doushantuo Formation. The rock dissolution at different pH values exhibits four typical stages: the initial dissolution stage, secondary dissolution acceleration stage, stable dissolution rate stage and dissolution attenuation stage. During the dissolution process, the initial dissolution rate is 25.91 times that of the stable stage, and the maximum strength attenuation is 76.2% after 21 days of dissolution. For macroscopic failure, the rock is developed from 1 to 2 external fractures to multiple internal and external fractures and penetrated, and the specimen transforms from brittle to flexible. For microstructure, the sample exhibits corrosion characteristics along the joint surface, intensified corrosion at the edge, etc. The porosity increase rate is 0.6%/d; however, the length–width ratio of the pores is maintained at 1.7–1.85, indicating that the development rate of pores in different directions is similar. The results of this study have enriched the study of the dolomite dissolution mechanism and, in addition, have important reference value for the stability evaluation of tunnel surrounding rock in karst environments.

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Section: Introductionmentioning

confidence: 99%

Study on the Microstructure Evolution and Strength Damage Mechanism of Dolomite under Dissolution Condition

Liu

et al. 2022

Sustainability

View full text Add to dashboard Cite

show abstract

The Mechanical Properties of Different Soil Moisture Content of Silt Study Based on the Experimental

Cited by 1 publication

References 1 publication

Study on the Microstructure Evolution and Strength Damage Mechanism of Dolomite under Dissolution Condition

Study on the Microstructure Evolution and Strength Damage Mechanism of Dolomite under Dissolution Condition

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