Experimental Study on Influence of Chemical Corrosion on Mechanical Property of Fissured Granite

Abstract

The effect of chemical corrosion and natural joints on the damage characteristics and strength of rock masses is highly important for the construction of rock engineering and energy extraction. Therefore, the intact granite is processed into prefabricated fissured granite specimens with a fissure angle of 0°, 30°, and 45°. Chemical corrosion tests are then performed on the prefabricated fissured granites. The pH of the solution gradually becomes neutral; the mass loss of the granite specimens and the mineral compositions of the fissure surface are measured and analyzed. The scanning electron microscopy (SEM) and uniaxial compression tests are performed on the granite specimens after chemical corrosion. After chemical corrosion, the surface of the fissure becomes loose. The various mineral components of the specimens have been changed to different degrees or converted into other mineral components. The peak strength and elastic modulus of the prefabricated fissured granites with the three fissure angles present a clear decrease, as the time of chemical corrosion increases. The stress intensity factors at the fissured tip are also analyzed. The stress intensity factors of the specimens with a fissure angle of 0°, 30°, and 45° decrease from 0.017, 0.35, and 0.84 to 0.013, 0.30, and 0.74 MPa·m1/2, respectively, as the time of the chemical corrosion increases. And the chemical corrosion has the largest effect on the intensity factors of the specimens with a fissure angle of 45° among the three angles. These experimental results could improve the understanding of the long-term stability of underground engineering in the multifield coupling environment.

The chemical damage of sandstone after sulfuric acid-rock reactions with different duration times and its influence on the impact mechanical behaviour

“…14 a,e), and then the σ p reaches the minimum. The E shows a monotonically decreasing trend with the acid-rock reaction time, indicating that the acid-rock reaction cannot change the rock material properties and the samples also show an obvious elastic stage though they have been degraded [ 71 ]. The ε p and are increased during the acid-rock reaction process, which shows a “first increases slowly and then increases rapidly” trend.…”

Effect of Chemical Corrosion on Rock Fracture Behavior in Coastal Deep Mines: Insights from Mechanical and Acoustic Characteristics

“…Granite is a typical geological formation in underground mining operations, ranging from host rock in mineral deposits to surrounding rock mass in tunneling and excavation activities. Although granite is a low-porosity crystalline rock with excellent durability, it is still susceptible to chemical corrosion when exposed to specific environmental conditions (e.g., coastal environments) [11,12]. Granite rock masses in coastal environments are often exposed to weathering processes that determine heavy chemical, physical, and mechanical alterations [13][14][15].…”

Study on Freezing-Thawing Failure Process of Natural Damage Sandstone Based on Cellular Automata

“…Therefore, many numerical methods have been developed to simulate the initiation and propagation of cracks under loading. In order to study the failure mechanism of fractured rock, Zhang et al [20] used the bond particle model in the particle flow code (PFC) to simulate the granite biaxial compression test. Yuan et al [21] used a uniaxial compression test and a particle flow code (PFC2D) to analyze the influence of the angle of fracture drop on the propagation of the mechanical properties of the fracture and the failure mode of red sandstone given the phenomenon that fractured rock columns are prone to collapse under underground pressure in underground engineering.…”