TY - GEN
T1 - Evaluation of tunnel jacking induced ground surface heave
AU - Prakoso, Widjojo Adi
AU - Lase, Yuskar
PY - 2014
Y1 - 2014
N2 - A 93m long concrete box tunnel was jacked underneath a tollway to provide an additional roadway for the crossing traffic. The geotechnical conditions were predominantly residual soils, with stiffer soils found in the tunnel exit area. During half-way of the jacking process, the pavement above the tunnel showed some signs of heave, causing disruptions to the traffic. This paper reports the results of numerical analyses performed to examine the probable cause of the observed heave in order to avoid similar problems to occur in the future. Plane strain finite element models were developed to simulate the tunnel jacking process. Three aspects were evaluated, namely the effect of different excavated soil conditions inside the box tunnel, the effect of jacking displacement, and the effect of inclined stiffer soil. It was found that the ground surface heave is dependent on the amount of soils excavated inside the box tunnel, which is in turn related to the required jacking force. All these observations would suggest that, to minimize ground surface deformation, it is important to maintain a relatively low jacking force.
AB - A 93m long concrete box tunnel was jacked underneath a tollway to provide an additional roadway for the crossing traffic. The geotechnical conditions were predominantly residual soils, with stiffer soils found in the tunnel exit area. During half-way of the jacking process, the pavement above the tunnel showed some signs of heave, causing disruptions to the traffic. This paper reports the results of numerical analyses performed to examine the probable cause of the observed heave in order to avoid similar problems to occur in the future. Plane strain finite element models were developed to simulate the tunnel jacking process. Three aspects were evaluated, namely the effect of different excavated soil conditions inside the box tunnel, the effect of jacking displacement, and the effect of inclined stiffer soil. It was found that the ground surface heave is dependent on the amount of soils excavated inside the box tunnel, which is in turn related to the required jacking force. All these observations would suggest that, to minimize ground surface deformation, it is important to maintain a relatively low jacking force.
UR - http://www.scopus.com/inward/record.url?scp=84907320057&partnerID=8YFLogxK
U2 - 10.1201/b17240-23
DO - 10.1201/b17240-23
M3 - Conference contribution
AN - SCOPUS:84907320057
SN - 9781138027008
T3 - Geotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 8th Int. Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, TC204 ISSMGE - IS-SEOUL 2014
SP - 123
EP - 128
BT - Geotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 8th Int. Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, TC204 ISSMGE - IS-SEOUL 2014
PB - Taylor and Francis - Balkema
T2 - 8th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, TC204 ISSMGE - IS-SEOUL 2014
Y2 - 25 August 2014 through 27 August 2014
ER -