Abstract
In order to study the influence of elevation on the slake durability index of the quartz mica schist, the quartz mica schist with different elevations on the east slope of the Manjiazhai open-pit mine is taken as the research object, and based on laboratory tests and statistical analysis, the variation of negative correlation between the slake durability index and elevation is obtained. The disintegration mechanism of quartz mica schist at different elevations is also discussed. The test results show that the disintegration characteristics of quartz mica schist at different elevations are related to its mineral composition, fissure channel size, and rock damage effect. As the slope height increases, the ratio of mica to quartz in the rock increases, and the greater the porosity of the rock, the more fissures in the rock, the greater the permeability coefficient, and the more obvious the change of effective stress of rock under osmotic pressure. At the same time, the higher the slope elevation of open-pit mine, the longer the weathering time of rock, the higher the cumulative damage of rock, and the lower the rock slake durability index. This study provides a new idea for guiding the research on the disintegration characteristics of similar soft rock slopes in the elevation direction.
Highlights
Soft rock is a common rock mass in slope engineering
Under the combined effect of temperature change and rainwater infiltration, the slope rock is prone to weathering and disintegration. is process is characterized by precipitation-evaporation dry-wet cycle effect [1], which causes a significant decrease in the shear strength of rock mass [2] and affects the overall or local stability of slope. erefore, the collapse characteristics of slope soft rock are directly related to the overall stability of slope and the design of the supporting scheme
In terms of the disintegration of soft rock particles, rock disintegration is the result of its internal microcracks continuing to germinate, develop, expand, gather, penetrate, and eventually break into small blocks. is process from microdamage to macrofracture has fractal properties [8]. erefore, many researchers introduced fractal theory to analyze the particle size change in the process of soft rock disintegration from multiple perspectives, calculated the fractal dimension to describe the disintegration process, and proposed a variety of fractal distribution models based on rock mass [9,10,11]
Summary
Soft rock is a common rock mass in slope engineering. Under the combined effect of temperature change and rainwater infiltration, the slope rock is prone to weathering and disintegration. is process is characterized by precipitation-evaporation dry-wet cycle effect [1], which causes a significant decrease in the shear strength of rock mass [2] and affects the overall or local stability of slope. erefore, the collapse characteristics of slope soft rock are directly related to the overall stability of slope and the design of the supporting scheme. Erefore, many researchers introduced fractal theory to analyze the particle size change in the process of soft rock disintegration from multiple perspectives, calculated the fractal dimension to describe the disintegration process, and proposed a variety of fractal distribution models based on rock mass [9,10,11]. Some researchers studied and summarized various ways of energy transfer, transformation, and dissipation in the process of soft rock disintegration, established related energy dissipation models, and pointed out that the change of surface energy leads to rock disintegration [15, 16]. Erefore, this paper takes the quartz mica schist on the slope of Manjiazhai open-pit slope as research object and studies the disintegration resistance characteristics of quartz mica schist at different elevations through deterioration test, statistical analysis, and mechanism analysis. Collapse under the influence of rainwater and platform excavation, leading to slope instability
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