【Daily Discussion】Public Utilities – Water Resources and Hydropower – 20210514

1) Curve sliding surface: When the sliding surface passes through the cohesive soil area, its shape is usually a curved surface with a steep top and a gradually flatter bottom; in stability analysis, it is often replaced by an arc. 2) Sliding planes along the fracture lines, which often occur in the dam slopes of non-cohesive soils. Such as in thin-core wall dams, inclined wall dams ； When part of the dam slope is submerged, the sliding surface is often nearly polygonal, with the turning points generally near the water surface. 3) Composite sliding surfaces: thick core walls, or various soil dams composed of clay and non-clay soils form composite sliding surfaces. When there are weak interlayers in the dam foundation, due to their low shear strength, the sliding surface does not deepen further downward; instead, a composite sliding surface consisting of curved and straight sections is formed along those interlayers.

1) Curve sliding surface: When the sliding surface passes through the cohesive soil area, its shape is usually a curved surface with a steep top and a gradually flatter bottom; in stability analysis, it is often replaced by an arc. 2) Sliding planes along the fracture lines, which often occur in the dam slopes of non-cohesive soils. Such as in thin-core wall dams, inclined wall dams ； When part of the dam slope is submerged, the sliding surface is often nearly polygonal, with the turning points generally near the water surface. 3) Composite sliding surfaces: thick core walls, or various soil dams composed of clay and non-clay soils form composite sliding surfaces. When there are weak interlayers in the dam foundation, due to their low shear strength, the sliding surface does not deepen further downward; instead, a composite sliding surface consisting of curved and straight sections is formed along those interlayers.

1) Curve sliding surface: When the sliding surface passes through the cohesive soil area, its shape is usually a curved surface with a steep top and a gradually flatter bottom; in stability analysis, it is often replaced by an arc. 2) Sliding planes along the fracture lines, which often occur in the dam slopes of non-cohesive soils. Such as in thin-core wall dams, inclined wall dams ； When part of the dam slope is submerged, the sliding surface is often nearly polygonal, with the turning points generally near the water surface. 3) Composite sliding surfaces: thick core walls, or various soil dams composed of clay and non-clay soils form composite sliding surfaces. When there are weak interlayers in the dam foundation, due to their low shear strength, the sliding surface does not deepen further downward; instead, a composite sliding surface consisting of curved and straight sections is formed along those interlayers.

Fall-off, collapse, breakdown, sliding, squeezing, swelling, erosion.

Common types of sliding failure: curved sliding surface, zigzag sliding surface, and composite sliding surface.

Gravity dams often suffer from sliding failure at their foundations, arch dams from failure at their abutments, and earth dams from seepage failure

1) Curve sliding surface: When the sliding surface passes through the cohesive soil area, its shape is usually a curved surface with a steep top and a gradually flatter bottom; in stability analysis, it is often replaced by an arc. 2) Sliding planes along the fracture lines, which often occur in the dam slopes of non-cohesive soils. Such as in thin-core wall dams, inclined wall dams ； When part of the dam slope is submerged, the sliding surface is often nearly polygonal, with the turning points generally near the water surface. 3) Composite sliding surfaces: thick core walls, or various soil dams composed of clay and non-clay soils form composite sliding surfaces. When there are weak interlayers in the dam foundation, due to their low shear strength, the sliding surface does not deepen further downward; instead, a composite sliding surface consisting of curved and straight sections is formed along those interlayers.

1) Curve sliding surface: When the sliding surface passes through the cohesive soil area, its shape is usually a curved surface with a steep top and a gradually flatter bottom; in stability analysis, it is often replaced by an arc. 2) Sliding planes along the fracture lines, which often occur in the dam slopes of non-cohesive soils. Such as in thin-core wall dams, inclined wall dams ； When part of the dam slope is submerged, the sliding surface is often nearly polygonal, with the turning points generally near the water surface. 3) Composite sliding surfaces: thick core walls, or various soil dams composed of clay and non-clay soils form composite sliding surfaces. When there are weak interlayers in the dam foundation, due to their low shear strength, the sliding surface does not deepen further downward; instead, a composite sliding surface consisting of curved and straight sections is formed along those interlayers.

1) Curve sliding surface: When the sliding surface passes through the cohesive soil area, its shape is usually a curved surface with a steep top and a gradually flatter bottom; in stability analysis, it is often replaced by an arc. 2) Sliding planes along the fracture lines, which often occur in the dam slopes of non-cohesive soils. Such as in thin-core wall dams, inclined wall dams ； When part of the dam slope is submerged, the sliding surface is often nearly polygonal, with the turning points generally near the water surface. 3) Composite sliding surfaces: thick core walls, or various soil dams composed of clay and non-clay soils form composite sliding surfaces. When there are weak interlayers in the dam foundation, due to their low shear strength, the sliding surface does not deepen further downward; instead, a composite sliding surface consisting of curved and straight sections is formed along those interlayers.

1) Curve sliding surface: When the sliding surface passes through the cohesive soil area, its shape is usually a curved surface with a steep top and a gradually flatter bottom; in stability analysis, it is often replaced by an arc. 2) Sliding planes along the fracture lines, which often occur in the dam slopes of non-cohesive soils. Such as in thin-core wall dams, inclined wall dams ； When part of the dam slope is submerged, the sliding surface is often nearly polygonal, with the turning points generally near the water surface. 3) Composite sliding surfaces: thick core walls, or various soil dams composed of clay and non-clay soils form composite sliding surfaces. When there are weak interlayers in the dam foundation, due to their low shear strength, the sliding surface does not deepen further downward; instead, a composite sliding surface consisting of curved and straight sections is formed along those interlayers.