Chapter
Jan 30, 2014
Chapter 4
Phreatic Surfaces
Publication: Slope Stability Analysis by the Limit Equilibrium Method: Fundamentals and Methods
Abstract
In the stability analysis of slopes, particularly those related to earth dams, estimating the location of the phreatic surface, or the line of seepage, is necessary. This chapter discusses various methods for determining the phreatic surface. If the slope has not been constructed and is complex in configuration, the phreatic surface can be obtained by drawing a flownet or using a finite-element computer program. The chapter provides details about flownets involving homogeneous cross-sections. It also discusses two methods for determining the point of exit depending on the angle of the filter drain, if the drainage system is provided within the dam, such as the use of porous shells, toe drains, or underdrains. Finally, the chapter briefly describes the application of pore pressure ratios.
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Slope Stability Analysis by the Limit Equilibrium Method: Fundamentals and Methods
Pages: 89 - 117
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© 2014 American Society of Civil Engineers.
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Published online: Jan 30, 2014
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