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2022 Vol. 49, No. 4
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ZHAO Wen, FU Wenli, ZHANG Jianguo, CHENG Shuaitao, HOU Xutao. A study of the hydration characteristics and determination method of mineral content of gypsum rock[J]. Hydrogeology & Engineering Geology, 2022, 49(4): 175-182. doi: 10.16030/j.cnki.issn.1000-3665.202108044
Citation: ZHAO Wen, FU Wenli, ZHANG Jianguo, CHENG Shuaitao, HOU Xutao. A study of the hydration characteristics and determination method of mineral content of gypsum rock[J]. Hydrogeology & Engineering Geology, 2022, 49(4): 175-182. doi: 10.16030/j.cnki.issn.1000-3665.202108044
shu

A study of the hydration characteristics and determination method of mineral content of gypsum rock

  • 1.

    Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan　610031, China

  • 2.

    China Railway Liuyuan Group Co. Ltd., Tianjin　300308, China

Received Date:  15 August 2021
Revised Date:  02 December 2021
Accepted Date:  03 December 2021
Publish Date:  25 July 2022
    Abstract

  • Expansibility and corrosivity of anhydrite and gypsum are the main disease-causing factors in gypsum rock tunnel engineering. Investigation of the mineral compositions, hydration characteristics, and contents of anhydrite and gypsum is the basis for evaluating the engineering hazard of gypsum rock. However, there is a lack of quick and simple method to determine the content of gypsum. By measuring the wave velocity and hydration depth in the hydration process of anhydrite rocks, the hydration characteristics of gypsum rocks are analyzed. Through the thermogravimetric analysis of anhydrite, gypsum, calcite and dolomite mixtures with different proportions, a thermogravimetric analysis method for rapid determination of mineral content of gypsum rocks is proposed. The results show that (1) thermal analysis, X-ray diffraction and infrared spectroscopy are recommended for the identification of mineral components of gypsum rocks. (2) Hydration of anhydrite rocks is slow, and it takes about 2 years for anhydrite rocks of the standard size specimen to be fully hydrated into gypsum rocks. (3) The hydration rate of intact anhydrite in the pure water environment is about 3 mm/a. If the groundwater environment is rich in < span class="inline-formula-span" > ${\rm{SO}}_4^{2-}$ < /span > < img text_id='' class='formula-img' style='display:none;' src='202108044_Z-20220516142458.png'/ > , the hydration rate of anhydrite will increase. The established method for determining the mineral content of gypsum rocks can quickly determine the contents of anhydrite and gypsum. The study results provide a reference for analyzing the engineering hazards of gypsum rocks.

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