| Citation: | LIU Qing，GAN Jianjun，CHEN Hao，et al. Landslide mechanism of metamorphic sandstone area containing weak interlayers in Shuangqiaoshan Group[J]. Bulletin of Geological Science and Technology，2025，44（1）：185-193 doi: 10.19509/j.cnki.dzkq.tb20230414
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The Shuangqiaoshan Group strata are widely exposed in East China, with complex lithology and stratigraphy, developed faults and folds, often forming weak interlayer slopes. These characteristics often create weak interlayer slopes that are prone to landslides under rainfall infiltration.
This study aims to reveal the deformation and evolution mechanisms of such slopes under rainfall conditions. Taking a typical silty clay-bearing soft interlayer landslide in Xiushui County as an example, the formation reasons and failure characteristics of the weak interlayer landslide were analyzed. A geomechanical model of accumulation landslides was established, and the landslide's response under different rainfall intensities was simulated using GeoStudio numerical analysis software.
The findings are as follows: (1) An EW-trending fault zone and ductile fault zone at the landslide's rear edge combine to form four groups of cracks that control slope stability, forming a boat-shaped weak interlayer approximately 8.8 m thick in the sliding bed; (2) Rainfall infiltrates into the sliding zone composed of debris and clay, triggering the sliding body to undergo three deformation stages: early creep, mid-stage sliding surface penetration, and late-stage shear deformation; (3) Creep deformation begins when rainfall intensity reaches 9.9 mm/d. At 40 mm/d, shear deformation increases along the weak structural plane and progressively intensifies. At 120 mm/d, a connected fracture surface forms along the weak interlayer structure, ultimately accelerating instability and landslide failure.
These findings provide valuable insights into the prevention and management of landslide disasters in similar lithological settings.
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