Research Topic (Plan): 2-D and 3-D Tomography of Liquefaction Potential Mapping

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Soil liquefaction potential is one of main problems in non-compacted granular soil deposit due to dynamic excitation caused by earthquake or other huge dynamic sources. This offered research is to continue the work from previous research for developing the 2-D and 3-D tomography technique in soil liquefaction potential mapping based on the shear wave velocity measurements. Duration of research work is 2 years, where the location of study is in Indonesia (selected provinces and sites). Funding of this research is still proposed to national agencies.

I would like to invite the researchers and scientists in this such area to join and participate in the research. Please do not hesitate to contact me (email) at atmaja[dot]sri[at]gmail[dot]com. Thank you!

Previous research: FAULT AND LIQUEFACTION ASSESSMENT USING GEO-RESISTIVITY AND SEISMIC TECHNIQUE

The earthquake of 6.3 MW scales in Yogyakarta on May 27, 2006 caused widespread destruction to the heavily populated and relatively prosperous region. In the case of geotechnical damages, ground surface cracks, permanent displacement landslides and liquefactions were a mostly ground failure events observed. Liquefaction triggered by the Yogyakarta earthquake in which liquefied sediments were ejected through ground fissures during the earthquake were also found in certain locations. In several areas, the building foundations were severely affected by ground deformation.  Housing units built on the hillside were heavily damaged or totally collapsed due to ground failure. Almost all geotechnical damages occurred not only near the main fault in Yogyakarta (known as Opak fault) but also existed on surface of other underground faults. The underground faults have been difficult to identify due to the limited information from geological maps and deeper soil profiles. In order to observe the underground faults cross section in the geotechnical damage area and liquefaction potential map, integrated soil investigation, geo-electric resistivity (electrical resistivity sounding) and seismic measurements were conducted in selected area. The discontinuity of soil layers in fault locations were clearly found in the sub-surface depth around 6 to 30 m. It was also found that local liquefaction were found in several sites in which the water table was relatively shallow and close to the fault lines. Ground settlements and horizontal displacement were also observed in several sites where signs of liquefaction were found nearby. Liquefaction potential was observed by seismic measurement, laboratory and SPT tests. The result showed that the severe building damage were close to the fault lines where the local liquefaction and soil boiling were recognized as well.

About Sri Atmaja P. Rosyidi

Sri Atmaja Putra Rosyidi’s Summary 1. Professional engineer; consulting works (2000 - present): design. evaluation and supervision of highway and road pavement. I have involved in more than 10 highway-projects of design and evaluation. 2. NDT testing engineer for soil structures and pavement; expert (2004 - present). Some projects have been evaluated for infrastructure health monitoring and structural assessment. 3. Board; operational manager (2006 - 2012): CASINDO and CAREPI project, Netherlands-Indonesia Energy Working Group. Specialization: Energy Infrastructure Design and Management. 4. Geology, geophysics and geo-hazards expert (2006 - present); specialization: soil dynamic, earth sciences and geotech.earthquake engineering. Some research project have been done. More than 20 international journal and conference papers have been published.