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ISSMGE Teknik Komiteler TC219 ve TC306 için Üyelik Başvurusu

Değerli ZMGM Derneği Üyeleri,

ISSMGE bünyesindeki TC219 “System Performance in Geotechnical Engineering” ve TC306 “Geo-engineering Education” komitelerine Türkiye adına üyeler önerilecektir.  ISSMGE’ye üye her ülkenin teknik komitelere  2 aktif ve 5 haberleşme üyesi önerme hakkı bulunmaktadır.  Bu iki komite ile ilgilenen meslektaşlarımızın özgeçmişlerini info@zmgm.org.tr adresine göndermeleri rica olunur.  Son başvuru tarihi 21 Ekim 2019 'dur.

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More information about TC219:
TC219 on “System Performance in Geotechnical Engineering” includes but no limit to the System safety performance, System resilience performance, Constructability performance, and Low environmental impact performance. This is because the geotechnical structures are usually designed using the member-based methods rather than the systems-based approaches. The designed geotechnical structures may lack of integrity and sufficient redundancy.
The system safety performance of the proposed TC is aims to let geotechnical system have enough robustness and redundancy to prevent from collapses or failures induced by the local damage or weakness. The system safety performance based design proposed in this TC aims to:
1.        identify the hazards and key elements in geotechnical system,
2.        demonstrate the hazards whole evolution process of the progressive collapse triggered by the local damage,
3.        investigate the propagation and termination mechanisms of the failure, and
4.        propose control methodology to optimize the design and improve the system safety performance of geotechnical structures.
We have preliminary proposed the design and control methodologies including the following three criterions which have considered the balance between construction cost and collapse loss of the geotechnical structure:
w   1st level is to prevent the local failure;
w   2nd level is to prevent propagation of failure triggered by local failure; and
w   3rd level is to control the range of the progressive failure.  
One example to illustrate the importance of the system safety performance is the collapse with fatalities of a 30m deep excavation near the Nicoll Highway MRT station under construction along the Circle Line and near the Merdeka Bridge in Singapore in 2004. The failure started at the 9th level strutting connection. Yielding of the connection allowed the diaphragm walls to deform, overloading the struts in levels above, causing them to buckle. This triggered 130 m long progressive collapse of the braced diaphragm walls. The other examples include the excavation collapse at the Xianghu subway station on Hangzhou metro line 1 in 2008 in Hangzhou, China and flood walls and levees failure during New Orleans flooding in 2005 due to Hurricane Katrina. If the examples were designed using the proposed three level of criterions and considering the balance between construction cost and failure loss, we believe the collapse range could be reduced.
The system resilience performance of the proposed TC is aims to improve the performance of a geotechnical structure not only to prevent from failure during disasters but also to quickly restore its basic function in a short time following disaster. One example to further illustration this point is the deep-sea Su-ai tunnel located in intense seismic area of China. The shape memory alloys are used to recover the dislocation and reduce the opening of the shield tunnel joints in a short time after earthquakes to prevent from the inflow of sand and water.
Besides the system safety performance and system resilience performance, the TC also concerns the constructability performance and low environmental impact performance of Geotechnical Engineering. The concept of the system performance can be applied to many different types of geotechnical structures. We believe that the performance based design theories will continue to be an active area of research in the near future. 
 
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