Experimental study on instability mechanism and critical intensity of rainfall of high-steep rock slopes under unsaturated conditions

Li, Xiaoshuang; Li, Qihang; Wang, Yunmin; Liu, Wei; Hou, Di; Zheng, Wenbo; Zhang, Xiong

doi:10.1016/j.ijmst.2023.07.009

Cited by 39 publications

(7 citation statements)

References 45 publications

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“…On the other hand, the soil flow lasts for a long time, and the velocity of soil movement is slow during the first 30 min of rainfall. After that, the velocity gradually increases until there is a rapid overall collapse of soil (X. S. Li et al, 2023).…”

Section: Analysis Of Resultsmentioning

confidence: 99%

Investigation on the disaster mechanism and dynamic evolution of a dump slope using experimental and numerical methods: Case study, Kunyang phosphate mine, China

Li,

Hou

et al. 2023

Geological Journal

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Dump slope is mainly attributed to the deep excavation of a mine. In the present work, the dump in Kunyang phosphate mine located in Sanjia Village was investigated. The geographic and geologic settings were first studied according to the field investigation. Aiming at the actual dump scenario, a rainfall system was designed to simulate the process of dump instability induced by rainfall. The novelty lies in conducting comprehensive tests on fundamental parameters, including water content, particle size, compactness, and engineering mechanical properties, through analogous simulation experiments. In addition, the SLIDE software was adopted to analyse the dumps in each mining area and subsequently determine the sliding disaster mode of the dumps in Kunyang phosphate mine. The comparative analysis of the dumps in these different mining areas showed that the dump in No. 6 mining area has a greater factor of safety (FS) and better stability (instability will not occur). Secondly, the stability of the dumps in No. 2, No. 3 and No. 4 is better than that in No. 5, but they have not reached the ultimate equilibrium state (instability will not occur). Nevertheless, the FS of the dump in No. 1 mining area approached or even fell below 1. Thus, it is predicted that a small‐scale landslide disaster may have occurred (instability). Moreover, the dynamic evolution characteristics of dump disasters with different accumulation densities were revealed by model device tests. Finally, the obvious tube surge phenomenon before sliding was observed.

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Section: Analysis Of Resultsmentioning

confidence: 99%

Investigation on the disaster mechanism and dynamic evolution of a dump slope using experimental and numerical methods: Case study, Kunyang phosphate mine, China

Li,

Hou

et al. 2023

Geological Journal

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“…The study of gas permeability in the reservoirs is vital for gas disasters (Yin et al, 2009;Li et al, 2023), and gas productivity under stimulation by supercritical carbon dioxide (Yang et al, 2022). Understanding the seepage and permeability characteristics of shale under the coupling action of multiphyisical fields is helpful in exploring the migration law of shale gas in natural shale reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical coupling seepage in fractured shale under stimulation of supercritical carbon dioxide

Liu,

Shang,

Chu

et al. 2024

Front. Earth Sci.

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As a waterless fracturing fluids for gas shale stimulation with low viscosity and strong diffusibility, supercritical CO2 is promising than the water by avoiding the clay hydration expansion and reducing reservoir damage. The permeability evolution influenced by the changes of the temperature and stress is the key to gas extraction in deep buried shale reservoirs. Thus, the study focuses on the coupling influence of effective stress, temperature, and CO2 adsorption expansion effects on the seepage characteristics of Silurian Longmaxi shale fractured by supercritical CO2. The results show that when the gas pressure is 1–3 MPa, the permeability decreases significantly with the increase in gas pressure, and the Klinkenberg effects plays a predominant role at this stage. When the gas pressure is 3–5 MPa, the permeability increases with the increase in gas pressure, and the influence of effective stress on permeability is dominant. The permeability decreases exponentially with the increase in effective stress. The permeability of shale after the adsorption of CO2 gas is significantly lower than that of before adsorption; the permeability decreases with the increase in temperature at 305.15 K–321.15 K, and with the increase in temperature, the permeability sensitivity to the temperature decreases. The permeability is closely related to supercritical CO2 injection pressure and volume stress; when the injection pressure of supercritical CO2 is constant, the permeability decreases with the increase in volume stress. The results can be used for the dynamic prediction of reservoir permeability and gas extraction in CO2-enhanced shale gas development.

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“…As open-pit mines become deeper and more concave, some of them switch to underground mining [2]. This transition is very complex because the surrounding rock mass is disturbed by the stress of excavation during open-pit mining, which causes damage to and fractures in the rock mass [3][4][5][6]. When underground mining starts, the rock mass is disturbed again [7].…”

Section: Introductionmentioning

confidence: 99%

Rainfall–Mining Coupling Effects on Slope Failure Mechanism and Evolution Process: A Case Study of Open-Pit to Underground Mining

Li,

Wang,

et al. 2024

Water

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This research examines how rainfall and mining affect the slope damage resulting from the transition from open-pit mining to underground mining. Using an unmanned aerial vehicle (UAV), the Huangniu slope of the Dexing Copper Mine was fully characterized, and experiments were conducted on rock samples from appropriate sites. First, the mechanical properties of the samples were measured. Then, the parameters of the similarity simulation experiments were derived based on the similarity theory. Subsequently, the rainfall, rock slope, data acquisition, and monitoring systems were designed. Finally, the rock mass failure with different slope angles was analyzed, and the deformation and damage patterns under the coupling effect were obtained. The results show that rainfall increases pore water pressure and moisture content. Rainfall and slope-slip water have more of an impact on the open-pit platform. The pore water pressure values on the upper rock mass rise faster than inside it. In the open-pit mining stage, the rock mass shifts slightly to the upper left. In the room mining stage, vertical fractures and goaf sinking occur. The fractures above the mine form a semi-ellipse. In the pillar mining stage, overlying rock displacement is evident and fractures persist. In the continuous pillar mining stage, the overlying rock collapses. The 65° slope model was the most damaged, while the 55° slope model was the least damaged. The results also suggest that the UAV guides sample selection.

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Experimental study on instability mechanism and critical intensity of rainfall of high-steep rock slopes under unsaturated conditions

Cited by 39 publications

References 45 publications

Investigation on the disaster mechanism and dynamic evolution of a dump slope using experimental and numerical methods: Case study, Kunyang phosphate mine, China

Investigation on the disaster mechanism and dynamic evolution of a dump slope using experimental and numerical methods: Case study, Kunyang phosphate mine, China

Thermomechanical coupling seepage in fractured shale under stimulation of supercritical carbon dioxide

Rainfall–Mining Coupling Effects on Slope Failure Mechanism and Evolution Process: A Case Study of Open-Pit to Underground Mining

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