For University of Texas at Austin, see University of Texas at Austin.

UTEXAS4 Screen Shot
Original author(s) Stephen G. Wright
Stable release
Operating system Microsoft Windows
Available in English
Type slope stability software
License Proprietary

UTEXAS is a slope stability analysis program written by Stephen G. Wright of the University of Texas at Austin. The program is used in the field of civil engineering to analyze levees, earth dams, natural slopes, and anywhere there is concern for mass wasting. UTEXAS finds the factor of safety for the slope and the critical failure surface. Recently the software was used to help determine the reasons behind the failure of I-walls during Hurricane Katrina.[1]


UTEXAS uses the limit equilibrium method. The user provides the geometry and shear strength parameters for the slope in question and UTEXAS computes a factor of safety against slope failure. The factor of safety for a candidate failure surface is computed as the forces driving failure along the surface divided by the shear resistance of the soils along the surface.[2]

UTEXAS employs a fast automatic search algorithm to find the failure surface with the lowest factor of safety with respect to shear strength. This is the critical failure surface. Alternatively an arbitrary surface can be entered by the user and UTEXAS can determine the factor of safety associated with it.[3]

The factor of safety for a shear surface is determined using a procedure of slices. Several different procedures exist and the user can choose among them.[3]

Input and output consist of text files. The geologic model is primarily defined using profile lines, which are lines defining the interface between different soil layers. Profile lines are associated with materials, and different materials with different properties can be defined.


The following is a list of some of the more distinct features of UTEXAS:

Version history


TexGraf4 screen shot


  1. Duncan, J.; Wright, S.; Vroman, N. (2008), Stability of I-walls in New Orleans during Hurricane Katrina (PDF), J. Geotech. Geoenviron. Eng. 134, SPECIAL ISSUE: Performance of Geo-Systems during Hurricane Katrina, American Society of Civil Engineers
  2. Aquaveo (2007), GMS Tutorials, UTEXAS - Embankment on Soft Clay (PDF), Aquaveo
  3. 1 2 Wright, S. (1999), UTEXAS4, A Computer Program For Slope Stability Calculations (PDF)
  4. (S. G. Wright, personal communication)
  5. Gms:Utexas - Xms Wiki
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