Fault rupture modification by blocky inclusions

Andrew Brennan, Matthieu Roby, Mark Bransby, Shuichi Nagaoka

Research output: Contribution to conferencePaper

23 Downloads (Pure)

Abstract

Subterranean fault rupture has been responsible for many recorded instances of building damage during past earthquakes. Differential displacement in the ground can cause shearing in overlying structures and can leave buildings in an unsupported condition. As the demand for land use increases, it may be necessary to adopt strategies to protect certain key structures from fault-related damage. This paper presents the results of an investigation of one potential mitigation scheme, that of providing rigid inclusions in the soil beneath the structure. Theoretically, the blocks should split the fault so that the fault expression at the surface is not a single surface scarp but a more gradual profile, with the effect of reducing the risk of the building being damaged either by rupture emergence along the length of the foundation or by excessive rotation. Modelling of a simple footing above a uniform sand is performed using both discrete element modelling and centrifuge model testing. While the numerical model demonstrates that blocks may be beneficial, the centrifuge tests were unable to demonstrate any splitting of the main rupture plane. However, the block mass was sufficient to increase local stresses and guide the fault. Based on this, it is concluded that while blocks may be capable of deflecting faults the method is too unreliable to be recommended without further supporting research.
Original languageEnglish
PagesPaper no. 1480
Number of pages11
Publication statusPublished - 25 Jun 2007
Event4th International Conference on Geotechnical Earthquake Engineering - Thessaloniki, Greece
Duration: 25 Jun 200728 Jun 2007
http://www.earthquake-issmge.org/events.html

Conference

Conference4th International Conference on Geotechnical Earthquake Engineering
CountryGreece
CityThessaloniki
Period25/06/0728/06/07
Internet address

    Fingerprint

Keywords

  • fault rupture
  • centrifuge
  • DEM
  • ground improvement

Cite this

Brennan, A., Roby, M., Bransby, M., & Nagaoka, S. (2007). Fault rupture modification by blocky inclusions. Paper no. 1480. Paper presented at 4th International Conference on Geotechnical Earthquake Engineering, Thessaloniki, Greece.