Abstract
In order to study the influence of dry-wet cycling on the deterioration characteristics of gypsum rocks and solve the problems encountered in engineering construction, in this study, gypsum rocks are taken as the research object. With the combination of laboratory test and theoretical analysis, the numerical simulation of particle flow is carried out, and the deterioration characteristics of physical and mechanical properties of gypsum rock under dry-wet cycling are studied. The results show that gypsum, quartz, zeolite and dolomite are the main components of gypsum rocks. Gypsum occupies the most components in gypsum rocks, so the various characteristics of gypsum greatly affect the characteristics of gypsum rocks. The process of water absorption and loss of gypsum is similar, which shows that the rate of water absorption or loss of gypsum is faster in the early stage, and tends to be stable in the later stage. The curve of the whole process of water absorption and loss is fitted by negative exponential function, and the effect is better. The larger the porosity of gypsum rock is, the better its water absorption performance is. Intergranular pore, dissolution pore and dissolution pore are the main pore types of gypsum rock. Intergranular pore is the main water absorption channel of gypsum rock. The cumulative water absorption increases with the increase of wetting and drying cycles. The change of water absorption curve is mainly manifested in water absorption rate and time. The more the number of wet-dry cycles is, the higher the water absorption rate in the early stage of water absorption is, the closer the characteristic curve to the coordinate axis of water absorption is, and the shorter the water absorption time is. In contrast, the shape difference of water loss curve is very small. It can be seen from this that in the process of wetting and drying cycle, the hydrophysical and hydrochemical processes promote each other, which changes the crystal structure and pore structure of gypsum rocks, reduces the crystal strength and increases the porosity, thus leading to the deterioration of the mechanical properties of gypsum rocks.
Highlights
From the deep part of the earth to the surface of the earth, water-rock interaction is ubiquitous, especially the wet-dry cycle (Jian & Niu, 2016)
As can be seen from the figure below, the cumulative water absorption of gypsum rock samples increases with the increase of wet and dry cycles
This phenomenon appears in the characteristics of water absorption curve, which indicates that the water absorption rate increases with the increase of the number of cycles
Summary
From the deep part of the earth to the surface of the earth, water-rock interaction is ubiquitous, especially the wet-dry cycle (Jian & Niu, 2016). The deterioration of rock mass caused by dry-wet cycling is equivalent to a kind of “fatigue effect”, and this deterioration is usually stronger than that of long-term immersion (Yao et al, 2015), which has an important impact on the stability and safety of rock mass engineering (Jiang & Shao, 2014). It is of great engineering significance to study the deterioration characteristics of mechanical properties of rock mass and rock mass under dry-wet cycling. Scholars at home and abroad have carried out extensive experimental studies on the changing law of rock mechanical properties under dry-wet cycling, and obtained many research results (Li et al, 2015)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.