In addition, Sound Transit has installed eight sensing devices for the building, including probes that would register any soil shifting at the tunnel depth.
Such alerts would allow Sound Transit time to apply extra grout between the tunnel and the apartment buildings basement.
6. Output Analysis and Discussion
Here, Sound Transit has taken reasonable and economically feasible precautions to reduce the risk of damage from soil sliding. At this point, the remaining hazards come from uncontrollable environmental factors, such as earthquakes and heavy rainfall, all of which are known to cause landslides and mudslides in the city of Seattle. Another factor which could cause damage to surface property is contractor negligence, for example when a contractor drills in a manner or pace which cumulates in excessive vibration and stress on surface structures.
7. Recommendation of the Improvement
In order to mitigate against uncontrollable environmental factors, Sound Transit should make sure that it has insurance policies which cover “Acts of God” in the event that such events result in property damage. In order to mitigate against contractor negligence, Sound Transit should create procedural guidelines which require regular measurement of soil impact and statements detailing contractor responses to new developments in soil conditions.
Practical Risk Management 4
http://projects.soundtransit.org/Projects-Home/University-Link.xml; http://projects.soundtransit.org/x1698.xml http://projects.soundtransit.org/Projects-Home/University-Link/Capitol-Hill-Station.xml
University Link fact sheet, available at http://projects.soundtransit.org/Documents/pdf/projects/link/north/ULink/U-LinkFact201105.pdf; Tunnel Boring Machine (TBM) fact sheet, available at http://projects.soundtransit.org/Documents/pdf/projects/link/north/ULink/Fact_TBM_2011.pdf
http://seattletransitblog.com/2009/08/22/what-worries-me / http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=0CDgQFjAD&url=http%3A%2F%2seattletimes.nwsource.com%2Fhtml%2Flocalnews%2F2017786224_lightrailtunnel19m.html&ei=RcihT5uiItDXiQKY_KCnBw&usg=AFQjCNEXOMa_1eXjDZYHLmE0x17HwocskQ&sig2=foo46kTqgFccdURytNg8Aw