Water saturation effects on the fracturing mechanism of sandstone excavating by TBM disc cutters

Lin, Qibin; Zhang, Shenchen; Liu, He; Shao, Zuliang

doi:10.1007/s43452-024-00964-z

Arch. Civ. Mech. Eng.

2024

DOI: 10.1007/s43452-024-00964-z

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Water saturation effects on the fracturing mechanism of sandstone excavating by TBM disc cutters

Qibin Lin,

Shenchen Zhang,

He Liu

et al.

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Cited by 5 publications

References 23 publications

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Experimental investigation on the moisture movement behavior of granites

Nazerigivi,

Ghiassi,

Dionísio

et al. 2024

Bull Eng Geol Environ

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This study comprehensively investigates the hygric performance of two commonly used types of granite in masonry, each characterized by distinct porosity levels. A series of experimental tests, including capillary absorption, one-dimensional drying, cup methods, vacuum saturation, sorption/desorption isotherms, mercury intrusion porosimetry, and ultrasonic pulse velocity, was conducted in different directions and by using both pure water and NaCl solutions. The results highlight pronounced anisotropy in the granite’s hygric response, with significant directional differences in liquid and vapor moisture movement, as well as ultrasonic wave propagation. Granite with lower porosity and a finer pore structure exhibited hysteresis effects and more pronounced hygroscopic behavior, while granite with higher porosity showed greater capillary activity. The presence of salt crystals within the pore network significantly influences vapor and liquid transport properties, porosity, and moisture storage capacity. The gradual formation of sodium chloride crystals on drying surfaces noticeably altered drying kinetics, influenced by salt concentration and pore characteristics. These findings provide valuable insights into the hygric properties of granite, essential for understanding its durability and informing moisture transfer numerical models.

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Experimental investigation on the moisture movement behavior of granites

Nazerigivi,

Ghiassi,

Dionísio

et al. 2024

Bull Eng Geol Environ

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Mechanical behavior and energy characteristics of red sandstone with different seawater immersion heights under biaxial compression

Peng,

Wu,

Wang

et al. 2024

Physics of Fluids

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Rock structures engineered during undersea mining are typically subjected to varying water distributions due to the motion of seawater, which considerably influences their stability. Hence, it is essential to understand the influence of seawater distribution on the mechanical behavior and energy characteristics of rocks. In this study, biaxial compression tests were conducted on red sandstone at various seawater immersion heights, and acoustic emission signals during compression were monitored. The results illustrate that the mechanical properties of the red sandstone deteriorate significantly upon seawater immersion. With an increase in seawater immersion height, the peak strength and elastic modulus of the rock specimens decreased exponentially. When the seawater immersion height was varied from 0 to 1/4 H under lateral stresses of 5, 10, 15, and 20 MPa, the peak strength decreased by 18.94%, 20.29%, 17.47%, and 14.87%, respectively, and the elastic modulus decreased by 4.6%, 8.1%, 11.7%, and 10.9%, respectively. Brittleness also decreased gradually. During compression, the acoustic emission (AE) and accumulated AE counts exhibited a stationary phenomenon, first increasing slowly and then suddenly. However, the AE counts decrease with increasing seawater immersion height. Meanwhile, with increasing seawater immersion height, the proportion of tensile cracks gradually increased and that of shear cracks gradually decreased. As the seawater immersion height increased, both the peak total input strain energy and peak total elastic strain energy decreased, whereas the peak total dissipated strain energy exhibited the opposite trend.

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Research on the Brazilian splitting characteristics and failure mechanism of jointed composite disks

Dou,

Shan,

et al. 2024

Mechanics of Advanced Materials and Structures

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Water saturation effects on the fracturing mechanism of sandstone excavating by TBM disc cutters

Cited by 5 publications

References 23 publications

Experimental investigation on the moisture movement behavior of granites

Experimental investigation on the moisture movement behavior of granites

Mechanical behavior and energy characteristics of red sandstone with different seawater immersion heights under biaxial compression

Research on the Brazilian splitting characteristics and failure mechanism of jointed composite disks

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