【Daily Discussion】Public Utilities – Water Resources and Hydropower – 20210121

⑴Layout of the underground contour line for clay dam foundations: Clay possesses cohesion and is less prone to piping, but it has a low friction coefficient. When designing the underground contour line, the main consideration is how to reduce the seepage pressure at the base of the dam in order to enhance the stability of the dam chamber. ⑵Layout of the underground contour line for sandey soil foundations: When the foundation is made of sandey soil, its friction coefficient with the base plate is high, resulting in a poor ability to resist permeable deformation; moreover, its permeability coefficient is also high. Therefore, when designing the underground contour, the focus should be on preventing permeable deformation and reducing leakage. ⑶Layout of the underground contour lines for special foundations: When there is confined water or a permeable layer in a weakly permeable foundation, in order to reduce the adverse effects of the confined water on the stability of the lock chamber, drainage and pressure-reduction wells can be installed at the bottom of the stilling basin, extending down into that confined water or permeable layer.

⑴Layout of the underground contour line for clay dam foundations: Clay possesses cohesion and is less prone to piping, but it has a low friction coefficient. When designing the underground contour line, the main consideration is how to reduce the seepage pressure at the base of the dam in order to enhance the stability of the dam chamber. ⑵Layout of the underground contour line for sandey soil foundations: When the foundation is made of sandey soil, its friction coefficient with the base plate is high, resulting in a poor ability to resist permeable deformation; moreover, its permeability coefficient is also high. Therefore, when designing the underground contour, the focus should be on preventing permeable deformation and reducing leakage. ⑶Layout of the underground contour lines for special foundations: When there is confined water or a permeable layer in a weakly permeable foundation, in order to reduce the adverse effects of the confined water on the stability of the lock chamber, drainage and pressure-reduction wells can be installed at the bottom of the stilling basin, extending down into that confined water or permeable layer.

⑴Layout of the underground contour line for clay dam foundations: Clay possesses cohesion and is less prone to piping, but it has a low friction coefficient. When designing the underground contour line, the main consideration is how to reduce the seepage pressure at the base of the dam in order to enhance the stability of the dam chamber. ⑵Layout of the underground contour line for sandey soil foundations: When the foundation is made of sandey soil, its friction coefficient with the base plate is high, resulting in a poor ability to resist permeable deformation; moreover, its permeability coefficient is also high. Therefore, when designing the underground contour, the focus should be on preventing permeable deformation and reducing leakage. ⑶Layout of the underground contour lines for special foundations: When there is confined water or a permeable layer in a weakly permeable foundation, in order to reduce the adverse effects of the confined water on the stability of the lock chamber, drainage and pressure-reduction wells can be installed at the bottom of the stilling basin, extending down into that confined water or permeable layer.

⑴Layout of the underground contour line for clay dam foundations: Clay possesses cohesion and is less prone to piping, but it has a low friction coefficient. When designing the underground contour line, the main consideration is how to reduce the seepage pressure at the base of the dam in order to enhance the stability of the dam chamber. ⑵Layout of the underground contour line for sandey soil foundations: When the foundation is made of sandey soil, its friction coefficient with the base plate is high, resulting in a poor ability to resist permeable deformation; moreover, its permeability coefficient is also high. Therefore, when designing the underground contour, the focus should be on preventing permeable deformation and reducing leakage. ⑶Layout of the underground contour lines for special foundations: When there is confined water or a permeable layer in a weakly permeable foundation, in order to reduce the adverse effects of the confined water on the stability of the lock chamber, drainage and pressure-reduction wells can be installed at the bottom of the stilling basin, extending down into that confined water or permeable layer.

⑴Layout of the underground contour line for clay dam foundations: Clay possesses cohesion and is less prone to piping, but it has a low friction coefficient. When designing the underground contour line, the main consideration is how to reduce the seepage pressure at the base of the dam in order to enhance the stability of the dam chamber. ⑵Layout of the underground contour line for sandey soil foundations: When the foundation is made of sandey soil, its friction coefficient with the base plate is high, resulting in a poor ability to resist permeable deformation; moreover, its permeability coefficient is also high. Therefore, when designing the underground contour, the focus should be on preventing permeable deformation and reducing leakage. ⑶Layout of the underground contour lines for special foundations: When there is confined water or a permeable layer in a weakly permeable foundation, in order to reduce the adverse effects of the confined water on the stability of the lock chamber, drainage and pressure-reduction wells can be installed at the bottom of the stilling basin, extending down into that confined water or permeable layer.

⑴Layout of the underground contour line for clay dam foundations: Clay possesses cohesion and is less prone to piping, but it has a low friction coefficient. When designing the underground contour line, the main consideration is how to reduce the seepage pressure at the base of the dam in order to enhance the stability of the dam chamber. ⑵Layout of the underground contour line for sandey soil foundations: When the foundation is made of sandey soil, its friction coefficient with the base plate is high, resulting in a poor ability to resist permeable deformation; moreover, its permeability coefficient is also high. Therefore, when designing the underground contour, the focus should be on preventing permeable deformation and reducing leakage. ⑶Layout of the underground contour lines for special foundations: When there is confined water or a permeable layer in a weakly permeable foundation, in order to reduce the adverse effects of the confined water on the stability of the lock chamber, drainage and pressure-reduction wells can be installed at the bottom of the stilling basin, extending down into that confined water or permeable layer.

⑴Layout of the underground contour line for clay dam foundations: Clay possesses cohesion and is less prone to piping, but it has a low friction coefficient. When designing the underground contour line, the main consideration is how to reduce the seepage pressure at the base of the dam in order to enhance the stability of the dam chamber. ⑵Layout of the underground contour line for sandey soil foundations: When the foundation is made of sandey soil, its friction coefficient with the base plate is high, resulting in a poor ability to resist permeable deformation; moreover, its permeability coefficient is also high. Therefore, when designing the underground contour, the focus should be on preventing permeable deformation and reducing leakage. ⑶Layout of the underground contour lines for special foundations: When there is confined water or a permeable layer in a weakly permeable foundation, in order to reduce the adverse effects of the confined water on the stability of the lock chamber, drainage and pressure-reduction wells can be installed at the bottom of the stilling basin, extending down into that confined water or permeable layer.

⑴Layout of the underground contour line for clay dam foundations: Clay possesses cohesion and is less prone to piping, but it has a low friction coefficient. When designing the underground contour line, the main consideration is how to reduce the seepage pressure at the base of the dam in order to enhance the stability of the dam chamber. ⑵Layout of the underground contour line for sandey soil foundations: When the foundation is made of sandey soil, its friction coefficient with the base plate is high, resulting in a poor ability to resist permeable deformation; moreover, its permeability coefficient is also high. Therefore, when designing the underground contour, the focus should be on preventing permeable deformation and reducing leakage. ⑶Layout of the underground contour lines for special foundations: When there is confined water or a permeable layer in a weakly permeable foundation, in order to reduce the adverse effects of the confined water on the stability of the lock chamber, drainage and pressure-reduction wells can be installed at the bottom of the stilling basin, extending down into that confined water or permeable layer.

⑴Layout of the underground contour line for clay dam foundations: Clay possesses cohesion and is less prone to piping, but it has a low friction coefficient. When designing the underground contour line, the main consideration is how to reduce the seepage pressure at the base of the dam in order to enhance the stability of the dam chamber. ⑵Layout of the underground contour line for sandey soil foundations: When the foundation is made of sandey soil, its friction coefficient with the base plate is high, resulting in a poor ability to resist permeable deformation; moreover, its permeability coefficient is also high. Therefore, when designing the underground contour, the focus should be on preventing permeable deformation and reducing leakage. ⑶Layout of the underground contour lines for special foundations: When there is confined water or a permeable layer in a weakly permeable foundation, in order to reduce the adverse effects of the confined water on the stability of the lock chamber, drainage and pressure-reduction wells can be installed at the bottom of the stilling basin, extending down into that confined water or permeable layer.

⑴Layout of the underground contour line for clay dam foundations: Clay possesses cohesion and is less prone to piping, but it has a low friction coefficient. When designing the underground contour line, the main consideration is how to reduce the seepage pressure at the base of the dam in order to enhance the stability of the dam chamber. ⑵Layout of the underground contour line for sandey soil foundations: When the foundation is made of sandey soil, its friction coefficient with the base plate is high, resulting in a poor ability to resist permeable deformation; moreover, its permeability coefficient is also high. Therefore, when designing the underground contour, the focus should be on preventing permeable deformation and reducing leakage. ⑶Layout of the underground contour lines for special foundations: When there is confined water or a permeable layer in a weakly permeable foundation, in order to reduce the adverse effects of the confined water on the stability of the lock chamber, drainage and pressure-reduction wells can be installed at the bottom of the stilling basin, extending down into that confined water or permeable layer.