Micro-damage evolution and macro-mechanical property degradation of limestone due to chemical effects

Li, Hao; Zhong, Zuliang; Liu, Xinrong; Sheng, Yong; Yang, Dongmin

doi:10.1016/j.ijrmms.2018.07.011

Cited by 71 publications

(21 citation statements)

References 32 publications

(35 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7d, e. Samples of other pHsolutions are not shown because their damage evolution is similar. Under the effect of external compressive stresses the micro damage of limestone can be divided into four stages (Li et al 2018), as shown in Fig. 7a-c, which also has a close relationship with the permeability changes of the rock sample.…”

Section: The Relationship Between the Mechanical Behavior And The Micmentioning

confidence: 98%

“…6 are the thresholds of the permeability evolution under unloading condition; before this point, the permeability decreases slightly, and after that begins to increase. The inflection points indicate the samples are already fully compacted; after these points, micro cracks begin to form some interconnections amongst them (Li et al 2018). The mechanism governing changes in the permeability of chemically corroded limestone samples under external stress is discussed in Sect.…”

Section: Hydrochemical-mechanical Effects On Permeability Changes Of mentioning

confidence: 99%

“…The failure development in rock initially consists of micro cracks closure, followed by micro cracks initiation and connection. Finally, macro crack occurs and connects resulting in sample rupture (Li et al 2018). Confining pressure unloading leads to an increase in tensile stress near the tip of micro cracks inside the rock samples and decrease in shear strength.…”

Section: The Relationship Between the Mechanical Behavior And The Micmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Investigation of the Permeability and Mechanical Behaviours of Chemically Corroded Limestone Under Different Unloading Conditions

Zhong

Eshiet³

et al. 2019

Rock Mech Rock Eng

Self Cite

View full text Add to dashboard Cite

This paper investigates the mechanical properties and permeability of chemically corroded rock during deep underground tunneling. Nuclear magnetic resonance tests are carried out to quantify the chemical damage of limestone samples at the microscopic scale. Coupled hydrostatic pressure-unloading tests at different unloading rates are also conducted on these chemically corroded limestone samples to investigate permeability changes and chemical effects on mechanical behaviours. Magnetic resonance imaging, T 2 spectrum distribution and porosity of the samples are obtained, and the chemical micro damage is visualized and quantified. The relationship between permeability and mechanical behaviors of the rock under hydrochemical-mechanical coupled effects is investigated. The results show that the permeability development process of the chemical corroded samples can be divided into three stages: at the first stage, the permeability initially decreases, and the second stage starts at the inflection point of the permeability curve, from where the permeability begins to increase slightly. At the third stage, the permeability of the limestone increases dramatically until the sample is ruptured. Chemical corrosion and unloading rates have a combined and significant influence on the development of micro cracks in rocks, which is the root cause of the permeability changes. A stress-permeability model is proposed to describe the permeability and stresses in chemical-corroded limestone; this can be adopted for other sedimentary rocks.

show abstract

Section: The Relationship Between the Mechanical Behavior And The Micmentioning

confidence: 98%

Section: Hydrochemical-mechanical Effects On Permeability Changes Of mentioning

confidence: 99%

Section: The Relationship Between the Mechanical Behavior And The Micmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Investigation of the Permeability and Mechanical Behaviours of Chemically Corroded Limestone Under Different Unloading Conditions

Zhong

Eshiet³

et al. 2019

Rock Mech Rock Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…e corresponding chemical damage model was established. Liu et al [21][22][23][24][25][26] took the sandstone in the ebb-flow zone of a reservoir in the ree Gorges as the research object.…”

Section: Introductionmentioning

confidence: 99%

“…ey summarized the changing law of mechanical properties and macro-and microdamage mechanisms of sandstone under dry-wet cycles [21,22] as well as the change of the physical parameters and microdamage mechanisms of limestone under chemical solution immersion. ey found that the basic reason for the decline of the mechanical properties of rocks was that the pH value of the chemical solution changed the porosity and microdamage evolution of the rocks [23]. In addition, they also analyzed the deterioration rule of sandstone mechanical parameters under acid-base conditions [24,25] and developed a numerical simulation program based on an improved Duncan-Chang constitutive model [26].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Physicomechanical Properties of Deep Sandstone by Coupling of Dry‐Wet Cycles and Acidic Environment

Huang

Pang

Liu

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Underground engineering, especially deep geotechnical engineering, is often affected alternately by groundwater infiltration and ventilation drying during construction and use. In addition, acid rain, mineral dissolution, acid deposition, and other factors make groundwater acidic. This caused the underground structure to erode and has also threatened its safety and durability. In this study, both the physical and mechanical properties under acid dry-wet (A-D-W) cycles were investigated. Deep sandstone was treated repeatedly under acid cycling, and its physical parameters were measured. Uniaxial compressive strength tests and microtests were carried out. Finally, using a combination of scanning electron microscopy (SEM) and backscatter electron images (BSE), the microstructural changes of sandstone under the combined action of an acidic environment and a dry-wet cycle were described. The test results show that the mass, P-wave velocity, peak stress, and elastic modulus of sandstone after the A-D-W cycles decreased by 0.43%, 7.87%, 70.20%, and 88.10%, respectively. With the increase in the number of cycles, the loss of these indicators increased. However, the peak strain increased with an average increase of 55.8%. In addition, 10 cycles are the critical point for physical and mechanical indicators of the A-D-W cycles. After 10 cycles, the changes of various indicators increase rapidly. Microscopic analysis shows that the reasons of this phenomenon were that the specimen was corroded by the sulfuric acid solution, which resulted in the development of pores and cracks and the decline of physical and mechanical properties. Conversely, the development of pores was hindered by sediment, which slowed down the decline rate of the physical and mechanical indexes of specimens, but this phenomenon disappeared with the increase of A-D-W cycles. Based on the analysis of the experimental phenomena, the constitutive model of uniaxial compression based on Weibull damage variable has been established in this article, and the model has the best effect in acid solution with less cycle times or pH value of solution greater than 6.

show abstract

Weakening Laws of Mechanical Properties of Sandstone Under the Effect of Chemical Corrosion

Lin

Zhou

et al. 2019

Rock Mech Rock Eng

View full text Add to dashboard Cite

Micro-damage evolution and macro-mechanical property degradation of limestone due to chemical effects

Abstract: This is a repository copy of Micro-damage evolution and macro-mechanical property degradation of limestone due to chemical effects.

Cited by 71 publications

References 32 publications

Experimental Investigation of the Permeability and Mechanical Behaviours of Chemically Corroded Limestone Under Different Unloading Conditions

Experimental Investigation of the Permeability and Mechanical Behaviours of Chemically Corroded Limestone Under Different Unloading Conditions

Experimental Study on Physicomechanical Properties of Deep Sandstone by Coupling of Dry‐Wet Cycles and Acidic Environment

Weakening Laws of Mechanical Properties of Sandstone Under the Effect of Chemical Corrosion

Contact Info

Product

Resources

About