Experimental study on progressive failure process and permeability characteristics of red sandstone under seepage pressure

Xiao, Weijing; Zhang, Dongming; Wang, Xiaojun

doi:10.1016/j.enggeo.2019.105406

Cited by 72 publications

(34 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, after 200 and 400°C heated, the P 3 value and the proportion of macropores did not change significantly compared with the room temperature samples, indicating that new pores and cracks of large pore size did not appear at 200 and 400°C. These results further explain the observation of many scholars that when the temperature is kept lower than 400°C, the strength of the treated sample, instead of decreasing significantly, increased in comparison with the ambient temperature sample 35,36 When the treatment temperature reached 600°C, compared with the ambient temperature sample, the three peaks of the T 2 spectrum increased significantly, among which the peak points P 1 , P 2 and P 3 were 0.38%, 0.29%, and 0.0071%, reflecting increases of 13.3%, 248.8%, and 184%, respectively.…”

Section: Test Results and Analysissupporting

confidence: 81%

Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment

Xiao

Yu²,

Li³

et al. 2021

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

To study the thermal cracking characteristics and mechanism of sandstone after high-temperature treatment, the pore size distribution and micromorphology of sandstone were observed by nuclear magnetic resonance and scanning electron microscopy. Then, based on the Weibull distribution theory, a thermal elastic mechanical model of random heterogeneous rock was established for the rock unit, the thermal stress distribution characteristics of sandstone were analyzed, and the thermal fracture mechanism of rock was discussed. The results show that the porosities of the samples increased with increasing temperature and the proportion of large pores increased significantly when exceeded 400 C. Particularly when reached 1000 C, thermal cracking was distributed in a complex network. Additionally, different rock units are in different thermal stress states, which leads to the regional differences in the distribution of rock thermal fracture. When exceeded 400 C, there were obvious thermal cracks near the outer edge that weakened the mechanical properties of rock.

show abstract

Section: Test Results and Analysissupporting

confidence: 81%

Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment

Xiao

Yu²,

Li³

et al. 2021

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

show abstract

“…Wang et al (2015) found that there were obvious weakening effects of seepage pressures on the mechanical properties after coarse sandstone damages. Xiao et al (2020) applied triaxial compressive test on red sandstone under seepage pressure and concluded that seepage pressure reduced the stress eigenvalues of rocks and affected its value of strain stiffness. Kou et al (2021) reported that seepage pressure promotes tensile crack initiation and propagation of artificial rock-like materials, and its ultimate failure mode transforms from pure shear failure mode to the mixed tensile-shear one with the increase in seepage pressure.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Shen

Chen

et al. 2022

Front. Mater.

View full text Add to dashboard Cite

Cemented tailing backfill (CTB) in underground mine inevitably experiences seepage field, which complicates its mechanical behavior. In this study, the mechanical properties and microstructure characteristics of CTB under different seepage water pressures (SWPs) were investigated. The results show that, with the increase in SWP, the mechanical properties of CTB decrease, but the decreasing trend reduces gradually. Higher SWP leads the microstructure of CTB looser and more porous, and the largest proportion of pores initiated and propagated by SWP is micropores, which means the damage in CTB under seepage is mostly caused by micropores. Besides, the mechanical properties of CTB under seepage decrease exponentially with the increase in porosity and present linearly inverse proportional relation to the pore area fractal dimension. Results above indicate that SWP has a significant deterioration effect on the mechanical properties and microstructure of CTB. The research could not only extend the knowledge of mechanical properties and microstructure characteristics of CTB under seepage but also provide a theoretical reference for mechanical index determination and stability analysis of CTB in water-rich underground mines.

show abstract

“…Fractured Sandstone. According to the assumption of a smooth parallel plate [31,36], the relationship between the seepage flow rate and the average gap width of the sample containing cracks is…”

Section: Calculation Formula For Seepage Flow In Cut-throughmentioning

confidence: 99%

Cut-Through Fractured Seepage Properties and Numerical Simulation of Sandstone after Different Temperature Treatments

Jiang

2021

Geofluids

View full text Add to dashboard Cite

To explore the seepage characteristics of cut-through fractured rocks after different temperatures, sandstone in the Hunan area was selected as the research object. First, the influence degree of different temperatures on the permeability of fractured sandstone was studied, and the permeability variation of fractured sandstone with net confining pressure was revealed. The test data was nonlinearly fitted to prove that the relationship between permeability and net confining pressure conforms to the characteristics of the negative exponential function. Second, the macroscopic fractured state of sandstone after different temperature treatments was analyzed, and it is concluded that the inclination angle of the fracture surface decreases with the applied thermal temperature, the fracture surface gradually develops into a single shear failure surface, and the damage degree becomes more and more serious. Finally, the theoretical formula for the calculation of fractured seepage was introduced, and the FLAC3D embedded fish language was used to compile the seepage-stress coupling calculation program of the fractured sandstone after different temperature treatments. Numerical calculations were carried out based on samples with different fracture angles of fractured sandstone, and the calculated values were in good agreement with the test results. The research results can provide guiding significance for the research on the influence of high temperature in fire tunnel on the evolution of permeability of surrounding rock fissures.

show abstract

Experimental study on progressive failure process and permeability characteristics of red sandstone under seepage pressure

Cited by 72 publications

References 23 publications

Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment

Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment

Mechanical Properties and Microstructure Evolution of Cemented Tailings Backfill Under Seepage Pressure

Cut-Through Fractured Seepage Properties and Numerical Simulation of Sandstone after Different Temperature Treatments

Contact Info

Product

Resources

About