Shaoxiong Yuan

Landslides are frequent in granite areas during rainfall. The hydrological response and deformation damage mechanisms of granite-weathered crust slopes were investigated by physical model tests. The variability of the material with respect to the thickness of the residual layer was taken into account. The results show that the three types of slopes exhibit distinct disaster mechanisms. For the E1 slope (10 cm residual layer), the residual layer was rapidly saturated, and seepage was formed. The residual soil was susceptible to severe suffosion, and an overall flow-slip failure occurred with no obvious sliding surface. For the E2 slope (20 cm residual layer), rainfall infiltrated the soil–rock interface, forming a temporary water table at this location. The slope tended to slide along the soil–rock interface at the foot of the slope under the traction and drag of water flow. For the E3 slope (30 cm residual layer), rainfall failed to infiltrate the interface, and no seepage was observed within the slope. The slope gradually slides within the residual layer under hydrostatic pressure and self-weight, with a circular arc sliding surface. This study fills the gap in granite-weathered crust landslides with different residual layer thicknesses and has certain theoretical significance.

Granite weathered crust exhibits a dual structure, which affects the pattern of damage on slopes. This study designed three kinds of slope models with residual layer thicknesses against the background of a landslide cluster in Mibei Village, Longchuan County, Guangdong Province. The hydrological response and deformation damage characteristics of granite weathered crust slopes under heavy rainfall conditions were analyzed and the disaster-causing mechanism of landslides was studied through physical model tests. The results show that the three types of slopes exhibit distinct disaster mechanisms. For the slope with a residual layer of 10 cm thickness, rainfall rapidly infiltrates the soil-rock interface, resulting in the formation of a temporary water table at the interface. The residual layer is rapidly saturated and is susceptible to overall flow-slip damage under seepage, with no obvious sliding surface. For the slope with a residual layer of 20 cm thickness, it takes a long time for rainfall to penetrate into the soil-rock interface. Rainwater gathered at the interface significantly reduces the shear strength of the residual soil. Slope tends to slide along the soil-rock interface at the slope toe under the traction and drag of water flow, which can result in sudden slide. For the slope with a residual layer of 10 cm thickness, no evidence of strong seepage is observed within the slope. The slope gradually slides along the wetting front under hydrostatic pressure and self-sliding force, with the circular arc sliding surface.

Granite weathered crust exhibits a dual structure, which affects the pattern of damage on slopes. This study designed three kinds of slope models with residual layer thicknesses against the background of a landslide cluster in Mibei Village, Longchuan County, Guangdong Province. The hydrological response and deformation damage characteristics of granite weathered crust slopes under heavy rainfall conditions were analyzed and the disaster-causing mechanism of landslides was studied through physical model tests. The results show that the three types of slopes exhibit distinct disaster mechanisms. For the slope with a residual layer of 10 cm thickness, rainfall rapidly infiltrates the soil-rock interface, resulting in the formation of a temporary water table at the interface. The residual layer is rapidly saturated and is susceptible to overall flow-slip damage under seepage, with no obvious sliding surface. For the slope with a residual layer of 20 cm thickness, it takes a long time for rainfall to penetrate into the soil-rock interface. Rainwater gathered at the interface significantly reduces the shear strength of the residual soil. Slope tends to slide along the soil-rock interface at the slope toe under the traction and drag of water flow, which can result in sudden slide. For the slope with a residual layer of 10 cm thickness, no evidence of strong seepage is observed within the slope. The slope gradually slides along the wetting front under hydrostatic pressure and self-sliding force, with the circular arc sliding surface.

Granite weathered crust exhibits a dual structure, which affects the pattern of damage on slopes. This study designed three kinds of slope models with residual layer thicknesses against the background of a landslide cluster in Mibei Village, Longchuan County, Guangdong Province. The hydrological response and deformation damage characteristics of granite weathered crust slopes under heavy rainfall conditions were analyzed and the disaster-causing mechanism of landslides was studied through physical model tests. The results show that the three types of slopes exhibit distinct disaster mechanisms. For the slope with a residual layer of 10 cm thickness, rainfall rapidly infiltrates the soil-rock interface, resulting in the formation of a temporary water table at the interface. The residual layer is rapidly saturated and is susceptible to overall flow-slip damage under seepage, with no obvious sliding surface. For the slope with a residual layer of 20 cm thickness, it takes a long time for rainfall to penetrate into the soil-rock interface. Rainwater gathered at the interface significantly reduces the shear strength of the residual soil. Slope tends to slide along the soil-rock interface at the slope toe under the traction and drag of water flow, which can result in sudden slide. For the slope with a residual layer of 10 cm thickness, no evidence of strong seepage is observed within the slope. The slope gradually slides along the wetting front under hydrostatic pressure and self-sliding force, with the circular arc sliding surface.

Granite weathered crust exhibits a dual structure, which affects the pattern of damage on slopes. This study designed three kinds of slope models with residual layer thicknesses against the background of a landslide cluster in Mibei Village, Longchuan County, Guangdong Province. The hydrological response and deformation damage characteristics of granite weathered crust slopes under heavy rainfall conditions were analyzed and the disaster-causing mechanism of landslides was studied through physical model tests. The results show that the three types of slopes exhibit distinct disaster mechanisms. For the slope with a residual layer of 10 cm thickness, rainfall rapidly infiltrates the soil-rock interface, resulting in the formation of a temporary water table at the interface. The residual layer is rapidly saturated and is susceptible to overall flow-slip damage under seepage, with no obvious sliding surface. For the slope with a residual layer of 20 cm thickness, it takes a long time for rainfall to penetrate into the soil-rock interface. Rainwater gathered at the interface significantly reduces the shear strength of the residual soil. Slope tends to slide along the soil-rock interface at the slope toe under the traction and drag of water flow, which can result in sudden slide. For the slope with a residual layer of 10 cm thickness, no evidence of strong seepage is observed within the slope. The slope gradually slides along the wetting front under hydrostatic pressure and self-sliding force, with the circular arc sliding surface.

Granite weathered crust exhibits a dual structure, which affects the pattern of damage on slopes. This study designed three kinds of slope models with residual layer thicknesses against the background of a landslide cluster in Mibei Village, Longchuan County, Guangdong Province. The hydrological response and deformation damage characteristics of granite weathered crust slopes under heavy rainfall conditions were analyzed and the disaster-causing mechanism of landslides was studied through physical model tests. The results show that the three types of slopes exhibit distinct disaster mechanisms. For the slope with a residual layer of 10 cm thickness, rainfall rapidly infiltrates the soil-rock interface, resulting in the formation of a temporary water table at the interface. The residual layer is rapidly saturated and is susceptible to overall flow-slip damage under seepage, with no obvious sliding surface. For the slope with a residual layer of 20 cm thickness, it takes a long time for rainfall to penetrate into the soil-rock interface. Rainwater gathered at the interface significantly reduces the shear strength of the residual soil. Slope tends to slide along the soil-rock interface at the slope toe under the traction and drag of water flow, which can result in sudden slide. For the slope with a residual layer of 10 cm thickness, no evidence of strong seepage is observed within the slope. The slope gradually slides along the wetting front under hydrostatic pressure and self-sliding force, with the circular arc sliding surface.

Granite weathered crust exhibits a dual structure, which affects the pattern of damage on slopes. This study designed three kinds of slope models with residual layer thicknesses against the background of a landslide cluster in Mibei Village, Longchuan County, Guangdong Province. The hydrological response and deformation damage characteristics of granite weathered crust slopes under heavy rainfall conditions were analyzed and the disaster-causing mechanism of landslides was studied through physical model tests. The results show that the three types of slopes exhibit distinct disaster mechanisms. For the slope with a residual layer of 10 cm thickness, rainfall rapidly infiltrates the soil-rock interface, resulting in the formation of a temporary water table at the interface. The residual layer is rapidly saturated and is susceptible to overall flow-slip damage under seepage, with no obvious sliding surface. For the slope with a residual layer of 20 cm thickness, it takes a long time for rainfall to penetrate into the soil-rock interface. Rainwater gathered at the interface significantly reduces the shear strength of the residual soil. Slope tends to slide along the soil-rock interface at the slope toe under the traction and drag of water flow, which can result in sudden slide. For the slope with a residual layer of 10 cm thickness, no evidence of strong seepage is observed within the slope. The slope gradually slides along the wetting front under hydrostatic pressure and self-sliding force, with the circular arc sliding surface.

Granite weathered crust exhibits a dual structure, which affects the pattern of damage on slopes. This study designed three kinds of slope models with residual layer thicknesses against the background of a landslide cluster in Mibei Village, Longchuan County, Guangdong Province. The hydrological response and deformation damage characteristics of granite weathered crust slopes under heavy rainfall conditions were analyzed and the disaster-causing mechanism of landslides was studied through physical model tests. The results show that the three types of slopes exhibit distinct disaster mechanisms. For the slope with a residual layer of 10 cm thickness, rainfall rapidly infiltrates the soil-rock interface, resulting in the formation of a temporary water table at the interface. The residual layer is rapidly saturated and is susceptible to overall flow-slip damage under seepage, with no obvious sliding surface. For the slope with a residual layer of 20 cm thickness, it takes a long time for rainfall to penetrate into the soil-rock interface. Rainwater gathered at the interface significantly reduces the shear strength of the residual soil. Slope tends to slide along the soil-rock interface at the slope toe under the traction and drag of water flow, which can result in sudden slide. For the slope with a residual layer of 10 cm thickness, no evidence of strong seepage is observed within the slope. The slope gradually slides along the wetting front under hydrostatic pressure and self-sliding force, with the circular arc sliding surface.

Granite weathered crust exhibits a dual structure, which affects the pattern of damage on slopes. This study designed three kinds of slope models with residual layer thicknesses against the background of a landslide cluster in Mibei Village, Longchuan County, Guangdong Province. The hydrological response and deformation damage characteristics of granite weathered crust slopes under heavy rainfall conditions were analyzed and the disaster-causing mechanism of landslides was studied through physical model tests. The results show that the three types of slopes exhibit distinct disaster mechanisms. For the slope with a residual layer of 10 cm thickness, rainfall rapidly infiltrates the soil-rock interface, resulting in the formation of a temporary water table at the interface. The residual layer is rapidly saturated and is susceptible to overall flow-slip damage under seepage, with no obvious sliding surface. For the slope with a residual layer of 20 cm thickness, it takes a long time for rainfall to penetrate into the soil-rock interface. Rainwater gathered at the interface significantly reduces the shear strength of the residual soil. Slope tends to slide along the soil-rock interface at the slope toe under the traction and drag of water flow, which can result in sudden slide. For the slope with a residual layer of 10 cm thickness, no evidence of strong seepage is observed within the slope. The slope gradually slides along the wetting front under hydrostatic pressure and self-sliding force, with the circular arc sliding surface.