【Daily Discussion】Public Utilities – Water Resources and Hydropower – 20210513
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What are the engineering measures to prevent seepage deformation in earth-rock dams? Answer: The engineering measures to prevent seepage deformation include: (1) Implementing horizontal or vertical seepage control measures in order to extend the seepage path as much as possible, thereby reducing the seepage gradient ； (2) Adopt drainage and pressure-reduction measures to reduce the seepage pressure at the water table of the dam body and at the downstream seepage outlets. At areas prone to piping, a filter layer should be installed to prevent fine particles from being carried away by seepage flow ； For areas downstream where soil flow may occur, a surcharge can be applied to enhance the soil’s capacity to resist permeable deformation. We welcome active participation in the discussions; the system offers generous rewards for answering questions from VIP members! ! !
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Engineering measures to prevent seepage deformation include: 1) Implementing horizontal or vertical seepage control measures in order to extend the seepage path as much as possible, thereby reducing the seepage gradient； 2) Adopt drainage and pressure-reduction measures to reduce the seepage pressure at the water table of the dam body and at the seepage outlets downstream. At areas prone to piping, a filter layer should be installed to prevent fine particles from being carried away by seepage flow ； For areas downstream where soil flow may occur, a surcharge can be applied to enhance the soil’s capacity to resist permeable deformation.
(1) Improve the structural properties of rock and soil masses, enhance their resistance to permeable deformation, and transform them from rock (soil) masses that are prone to permeable deformation into those that are less susceptible to permeable failure. (2) Take measures to cut off the seepage flow within the rock (soil) mass or reduce its seepage gradient, making it smaller than the allowable gradient.
(1) Adopt horizontal or vertical impermeabilization measures to extend the seepage path as much as possible, thereby reducing the seepage gradient； (2) Adopt drainage and pressure-reduction measures to reduce the seepage pressure at the water table of the dam body and at the downstream seepage outlets. At areas where piping may occur, a filter layer should be installed to prevent fine particles from being carried away by seepage flow ； At locations downstream where soil flow may occur, a cover weight can be applied to enhance the soil’s capacity to resist permeable deformation.
Seepage within the body of an earth-rock dam and its foundation, due to physical or chemical effects, causes the loss of soil particles and localized damage to the soil, a phenomenon known as seepage deformation. Engineering measures to prevent seepage deformation include: (1) Implementing horizontal or vertical seepage control measures in order to extend the seepage path as much as possible, thereby reducing the seepage gradient ； (2) Adopt drainage and pressure-reduction measures to reduce the seepage pressure at the water table of the dam body and at the downstream seepage outlets. At areas where piping may occur, a filter layer should be installed to prevent fine particles from being carried away by seepage flow ； At locations downstream where soil flow may occur, a cover weight can be applied to enhance the soil’s capacity to resist permeable deformation.
(1) Adopt horizontal or vertical impermeabilization measures to extend the seepage path as much as possible, thereby reducing the seepage gradient; (2) Implement drainage and pressure-reduction measures to lower the seepage pressure at the water table of the dam body and at the seepage outlets downstream. At areas where piping may occur, a filter layer should be installed to prevent fine particles from being carried away by seepage; in areas downstream where soil flow might happen, a weight can be applied to enhance the soil’s capacity to resist permeable deformation.
Engineering measures to prevent seepage deformation in earth and rock dams include: installing horizontal and vertical impermeable barriers, increasing the length of the seepage path, reducing the seepage gradient, or blocking seepage flow； Install drainage ditches or pressure reduction wells to reduce the seepage pressure at the downstream seepage points, and systematically remove the seepage water ； In areas prone to piping, a filter layer should be installed to prevent fine particles from being carried away by seepage currents ； In areas where soil erosion may occur, the weight of the cover over the seepage outlets should be increased; a filter layer should also be placed between the cover and the protective layer
(1) Improve the structural properties of rock and soil masses, enhance their resistance to permeable deformation, and transform them from rock (soil) masses that are prone to permeable deformation into those that are less susceptible to permeable failure. (2) Take measures to cut off the seepage flow within the rock (soil) mass or reduce its seepage gradient, making it smaller than the allowable gradient.
Engineering measures to prevent seepage deformation include: (1) adopting horizontal or vertical seepage control measures in order to extend the seepage path as much as possible, thereby reducing the seepage gradient； (2) Adopt drainage and pressure-reduction measures to reduce the seepage pressure at the water table of the dam body and at the downstream seepage outlets. (3) At locations where piping may occur, a filter layer must be installed to prevent fine particles from being carried away by seepage flow ； At locations downstream where soil flow may occur, a cover weight can be applied to enhance the soil’s capacity to resist permeable deformation.