Session Start Date

6-1-1988

Abstract

Seven ground anchors were installed for full scale field tests in Taipei Railway Underground Project. The soil at job site can generally be classified as silty clay or clayey silt. The length of the anchors was about 40 m each, including 23 m bond length. The borehole diameter was 125 mm and the designed borehole inclination was 26 degrees downward. Each of the anchors was expected to share approximately 300 to 400 kN of tie-back force to support the diaphragm wall during excavation. Investigation of the borehole inclination was carried out by using horizontal inclinometer. The distribution of skin friction along the bond anchorage was determined from strain gauges applied on the anchoring strands, and the tensile load was monitored by load cells. It was observed that the average borehole direction deviated with an angle of about 1.5 degrees. It has also been found that most of the design load was carried by the first 10 m of the bond length. For a nearest spacing of about 1.5 m between the anchors, the group effect and the stress interaction among them were negligible.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1988

Document Version

Final Version

Rights

© 1988 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

Share

 
COinS
 
Jun 1st, 12:00 AM

Behavior of Ground Anchors for Taipei Sedimentary Soils

Seven ground anchors were installed for full scale field tests in Taipei Railway Underground Project. The soil at job site can generally be classified as silty clay or clayey silt. The length of the anchors was about 40 m each, including 23 m bond length. The borehole diameter was 125 mm and the designed borehole inclination was 26 degrees downward. Each of the anchors was expected to share approximately 300 to 400 kN of tie-back force to support the diaphragm wall during excavation. Investigation of the borehole inclination was carried out by using horizontal inclinometer. The distribution of skin friction along the bond anchorage was determined from strain gauges applied on the anchoring strands, and the tensile load was monitored by load cells. It was observed that the average borehole direction deviated with an angle of about 1.5 degrees. It has also been found that most of the design load was carried by the first 10 m of the bond length. For a nearest spacing of about 1.5 m between the anchors, the group effect and the stress interaction among them were negligible.