Document Type

Thesis - University Access Only

Award Date


Degree Name

Master of Science (MS)

Department / School

Civil Engineering


Two new methods to formulate p-y curves from borehole jack test are here proposed for the analysis of laterally loaded pile in rock (a Modified Reese's method and the BJT method). The first modifies the method of Reese (1997) suggested to use the results of the borehole jack test. The second method is based on an analogy of load-displacement relationship between the borehole jack test and a laterally loaded pile. In this method, the initial slope of p-y curve is developed directly from the borehole jack results, considering the load-transfer mode of the test. The ultimate resistance is determined using a residual strength concept due to the induced confining pressure of the rock next to the loaded pile, which is obtained from the unconfined compression test. The displacement of a pile is predicted with a program (COM624) for the analysis of laterally loaded piles in soil. Because full-scale tests results were not available, only the results of the computer analysis with two types of p-y curves obtained from two methods can be compared. It is shown that BJT method provides a higher estimate of the displacement of pile near the surface compared with the results of the modified Reese's method. In order to determine the validity of the proposed methods, the full-scale lateral loading test should be conducted in rock.

Library of Congress Subject Headings

Lateral loads
Piling (Civil engineering)



Number of Pages



South Dakota State University