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eedings of the Tenth 2000) International Offshore and Polar Engineering Conference

ight © 2000 by The International Society of Offshore and Polar Engineerx

X SeO; ISBN 1-880653-48.6 Iiol. ll); ISSN 1098-6189 Set)

S o ft G r o u n d I m p r o v e m e n t b y P a p e r P a c k a n d M e n a r d D r a i n s

H.I. Chung and H.S. Jin

Korea Ins t itute of Const ruc t ion Technology Koyang Korea

K N J i n

Korea Land Corporat ion Sungnam Korea

This study describes the soft ground improvement treated with

ins at a full-scale trial field test site at Yangsan

l drai ns for soft ground improvement. The

instrumented, and good performance data

limiting equilibrium, and the strength increasing of the

three years from 1996 to the present time. This field test site is

This paper described the performance of the vertical drains in

recorded, with conclusions regar ding the practical

o f

p l a t e s e x t e n s o m e t e r s a n d i n c l i n o m e t e r s a n d p r e d i c t e d

i n i t e e l e m e n t m e t h o d a n d o b s e r v a t i o n a l p r e d i c t i o n m e t h o d .

I n t h i s p a p e r r e l a t i o n s h i p s f o r v e r t ic a l s e t t l e m e n t a n d l a t e r a l

t e r e m b a n k m e n t c o n s tr u c t i o n s t r e n g th

g e s o f f o u n d a t i o n c l a y b e t w e e n b e f o r e a n d a f t e r d r a i n

o n a n d e t c . w e r e o b t a i n e d . T h e s e r e l a t i o n s h i p s c a n b e

f o r p r e d i c t i o n o f th e r a t e s a n d m a g n i t u d e s o f t h e

d b y v e r t ic a l d r a i n s u n d e r

a n k m e n t o n m a r i n e s o f t s o il .

, improvement, settlement, displacement,

kment , test, vertical drain

This study is concerned x~ith the soft ground improvement by paper.

ard drains at full-scale trial field test site at Yangsan area

mes. A typical plan

view of test site is shown in Figure 2. The test site is divided into

sections such as paper drain section, pack drain section, and mena

drain section. This study provides a means of evaluating

effectiveness of vertical drains in improving soft ground subjected

embankment loading. The depth of soft ground is 30m. and the dep

of vertical drains installed in soft ground is 25m. The vertical dra

were not installed from 25m below the ground level to the bottom

the soft clay layer. Thus, the depth of upper 5m at the bottom of t

soft clay layer was untreated by vertical drains. The embankment

consisted of a granitic residual soil compacted to a unit weight of

kN/m ~. The drain parameters relevant for the measurement and analy

are summarised as follows.

- drain pattern: rectangular

- drain length: 25m

- drain spacing: paper drains(1.0m, l.Sm), pack drains(0.8m, 1.2

1.4m, 1.6m). menard drains(1.0m, 1.2m, 1.4m, 1.6m)

Seoul

r ~ f

• / /

; . . / ,

~ ....... }, ~ / Yangsan

Figure 1. Location of trial field test site

514