Dear Sir,
1. About myself:
First of all, I would like to introduce myself to you.
I am an engineering geologist. I did my BSc (Geology) at Korea university
at 1980 and MSc (Engineering Geology)at Leeds university, U.K. at 1982,
PhD (Engineering Geology under the supervision of Dr. M.H. deFreitas)
at Imperial College at 1987. After came back to Korea I have worked for
8 years (1987-1995) at the Korea Institute of Geology and Mineral resources
(KIGAM: formerly Geological Survey of Korea). Now I am an associate professor
at the department of civil engineering at the University of Seoul since
1995. Our university is belong to the Seoul City Metropolitan Government.
2. Present activity:
Since I came back to Korea at 1987, I have researched
natural landslides and man-made cut slopes for 20 years. Now I am Head
of landslide Research Centre leading a landslide research team (50 members)
funded by National Emergency Management Agency, Ministry of Government
Administration and Home Affairs, Korea. Our project will be scheduled
from Sept. 2006-April 2011.
I would like to introduce our research team. Korea
suffers from various natural and artificial hazards. To reduce the casualties
and property-losses from natural and artificial hazards, National Emergency
Management Agency (NEMA) was established as an organization of Ministry
of Government Administration and Home Affairs, Korea.
Last year Korean government made a law to control man-made
cut slopes existed in Korea. Therefore in May 2006, NEMA announced R &
D project on Development methods to estimate cut slope failures and how
to control them. Our team was finally selected after competition between
3 consortiums.
Our 50 research members consisting of various universities,
government research institutes and private designing and construction,
companies are researching techniques for site investigation, soil and
rock testing, decision of geotechnical parameters, designing, reinforcement,
monitoring, maintaining and data base etc.
I will give an announcement about Korean landslides
as a national representative at the International Forum on Landslide Disaster
Management, December 2007, Hong Kong. This Forum is organized under the
auspices of the Joint Technical Committee on Landslides and Engineering
Slopes (JTC-1) of the ISSMGE, ISRM and IAEG.The Hong Kong Geotechnical
Society, Hong Kong Institution of Engineers and Geotechnical Engineering
Office of the Hong Kong SAR Government will host the event.
3. my present interesting research topics:
(1) Shear strength of the boundary of soil and rock.
Korea consists of 70% mountainous area. On the ground
surface of 30-degree inclination in mountainous area the depth of weathering
(Residual soil) is limited to 1~2m in thickness. Thus during the Typhoon
seasons of June to September most of landslide occur along the boundary
between soil and rock. Thus recently I have studied the shear strength
of the boundary of soil and rock on various rock types such as Igneous,
Metamorphic and Sedimentary rocks. My research results show the shear
strength of the boundary of soil and rock is lower than the soil itself.
(2) Miniature landslide model test:
I have researched the shallow landslide which is also
dominant type of landslide in Korea. Most of landslide occurs along the
boundary between shallow soil of 1m thickness and bed rock. Nowadays I
will try to make the landslide miniature tester in order to know the process
of rock-soil boundary landslide.
(3) Rock mass properties of corestone weathering profile:
(so called "Melange")
Form the time of PhD research I have interested in
the engineering characteristics of the mixture of soil and rock, so called
"melange", thus from a few years ago I have studied in the engineering
characteristics of melange. Last a few years I have studied the trend
of uniaxial compressive strength at various % of corestone. Now I try
to study the size and shape effects of melange on triaxial compressive
strength. Also I want to know the fracture development by using MRI (Magnetic
Resonance Imaging) instrument, which is widely used tools in the field
of medical investigation.
(4) Engineering geological map of Seoul
5 years ago, I made an engineering geological map of
Seoul, named as "GEO-SEOUL". It was sponsored by the Seoul city
and took 2 years to complete.
Being unfamiliar with computer programming, I asked
a computer programmer to make the GEO-SEOUL in the way I want it to be
done. 10,000 drilling logs used for underground subway and foundation
of buildings and houses had been collected. Among them 6,500 drilling
logs were chosen after careful consideration on their reliability. Format
of the drilling logs, its terminology and order of description were not
standardized. Thus I made a standard logging format and made all the drilling
logs re-written according to the standard logging format.
The programme shows both large-scaled and small-scaled
digital topographical and geological map. If you click one of drilling
logs shown in the topographical map, the drilling log information are
shown in the manner of standard logging format.
The programme also can predict the degree of weathering
with depth even if at a certain location which has no logging data. Also,
the programme can show the over-all distribution of rock head, fracturing
and ground water table. If a certain boundary and depth are being dictated
(for example at -10m depth from the ground surface), the programme will
show the distribution of weathering, fracturing and ground water table
within the boundary (at a certain depth, e.g. -10m). Also the programme
shows a cross-sectional view at a certain line, showing the intensity
of weathering and water table, and also a 3-dimensional block diagram,
which can be rotated.
(5) Corrected RQD % for SHALE
I have some field experiences with Shale in Korea.
Because Shale has often weak strength along the bedding, it should be
carefully considered about what the real RQD % values mean. From intensive
point load strength test with Shale, I would like to suggest that the
"corrected RQD % values" which is lower than the real RQD %
value, should be used rather than the real RQD % value if NX core can
be separated into two part with light hand force, as the diagnosis 'breakability
of NX core in the hand', has frequently been quoted as a means to distinguish
MW and HW materials (Terzaghi and Peck (1967). Thus I would like to publisher
a paper, "A Study on Engineering characteristic and Suggested Methods
for Determining RQD % as for Shale".
(6) Field seismic test results in corestone weathering
profile
In corestone weathering profile, it is very difficult
to define the boundary between blasting rock and ripping rock. Also, the
well-known figure (Enclosure 5) of rock quality classification in relation
to excavation suggested by Dr. J.A.Franklin (1971) can not be applied
to corestone weathering profile. According to my field seismic test results
conducted in corestone weathering profile in Korea, also the field seismic
test can be applied with a high reliability to corestone weathering profile
by considering general workability and efficiency of excavation tools.
Thus I would like to write a paper such as "Application of field
seismic velocity to predict the diggability (blasting rock, ripping rock)
in corestone weathering profile".
4. Looking for PhD & MSc chinese students who can
speak/read Korean:
I am looking for a few Chinese post-graduate students
for MSc and/or PhD courses (or Post-Doctor).
I wonder whether you can recomended any diligent Chinese
student (majoring geotechnical engineering and/or geology) interested
in my research fields. Specially I prefer Chinese student speaking Korean
language because most of post-graduate cources are lectured in Korean
at present. I would like to support the tuition fee and living expenses.
Sincerely yours,
Su-Gon LEE, PhD & DIC
Associate Professor
(Head of Landslide Research Centre),
Department of Civil Engineering,
University of Seoul,
email: sglee@uos.ac.kr
Mobile: 82-11-9770-2407
Tel No. (Office): 82-2-2210-2407
Fax No. (Office): 82-2-2243-2407
Mobile phone No.; 011-9770-2407
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