红层及其地质灾害研究

doi:10.13722/j.cnki.jrme.2022.0012

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Abstract Red beds refer to the general name of red rock series deposited in various geological historical periods，which are a group of typical “slippery stratum”. Slopes in red bed areas are prone to form group-occurring geohazards in the process of heavy rainfall. By summarizing the development，distribution and main characteristics of red beds，it is found that the properties of red beds are controlled by sedimentary construction. The physical and mechanical properties and hydrologic properties of red beds are different due to the sedimentary environment. Red bed rocks have strong rheology and hydrophilicity，and are easy to swell，disintegrate，muddy and soften when exposed to water. The main types of geohazards in red bed areas are analyzed and summarized，and the formation mechanism of sub-horizontal translantional landslides and gentle shallow soil landslides in sand-mudstone interbedded areas is mainly introduced. The results show that the rainwater quickly infiltrates into the vertical cracks in sandstone and forms hydrostatic pressure，which often becomes the main driving force of sub-horizontal translational landslides. The long-term argillization and saturation softening of mudstone in sand-mudstone contact interface or weak interlayer by groundwater greatly reduces the strength of the bottom slip surface，which is also the main cause of large sub-horizontal translational landslides. Of course，the special slope hydrogeological conditions formed by the special lithologic combination of sand-mudstone interbedded are also the important reasons for landslides. The atmospheric influence depth in the slope residual layer and the interface effect in the base layer are the main reasons for the occurrence of shallow soil landslides during heavy rainfall，which determines the thickness of the landslide body. Finally，the risk prevention and control measures of red beds geohazards are discussed，and it is considered that establishing physical warning models through mathematical and mechanical analysis combined with field observation and laboratory tests is an effective way of red beds landslides warning. The landslides in red bed area should be controlled mainly by drainage and auxiliary by anti-slide measures.

Key words： slope engineering red beds geohazards genetic mechanism sub-horizontal translational landslide shallow soil landslide risk prevention and control

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	XU Qiang1
	TANG Ran2
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XU Qiang1,TANG Ran2,3. Study on red beds and its geological hazards[J]. , 2023, 42(1): 28-50.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0012 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I1/28

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