Research Themes of Road & Geotechnical Laboratoryof Road & Geotechnical Laboratory

Overview

Where is Fukuoka ? (About Fukuoka-city)

Laboratory member

Research Themes of Road & Geotechnical LaboratoryResearch Themes of Road & Geotechnical Laboratory

・Waste Landfill

ff i ili i f d d i l・Effective Utilisation of By-products as Ground Material

・Development of Insolubilization Technique for Wastes and Examination

f th A t f A t f E i t l i tof the Act for Assessment of Environmental impacts

・Pavement

・Fundamental Research on Liquefaction and Mechanical Property of Soil・Fundamental Research on Liquefaction and Mechanical Property of Soil

Japan and Fukuoka

Kyushu About JapanCapital : TokyoPopulation :128 millionPopulation :128 million

TokyoO kKyoto

TokyoOsaka

Fukuoka city(Government-decreed city )(Government decreed city )

Population : 1.4 million

Major places

234 m234 m

(Designated as a nationally important cultural property) Dazaifu Tenman-gu Shrine

Tower of Fukuoka

Yahoo dome (Baseball stadium)

Tower of Fukuoka

Traditional festival

Hakata DontakuHakata Dontaku

Hakata Gion Yamakasa: a summer festival forthe men of Hakata

Fukuoka University 75th Anniversary

Humanities Law Economics commerce

Ph ti l

Science Engineering

S t dPharmaceutical Sciences

Medicine Sports and Health Science Faculties

There are about 20 thousand students in our university.

The member of our laboratoryCherry blossom viewing party April 2 2010Cherry blossom viewing party April 2, 2010

Laboratory staff

P fProfessorKenichi SATO Dr.Eng.Age:48gHobby: Watching sport

TechnicianTakuro FUJIKAWA Dr.Eng.Age:31Hobby: Baseball, Karate (Black belt )

SecretaryyMs. Miki YAMADAAge:41Hobby: Yoga, Painting

Master course students 2nd grade

Kyohei HOSHINO Kazuki MUNEISHIAAge:

Hobby: TennisAge:Hobby: Soccer

Hi it SHINA

1st grade

Hiromitsu SHINAAge:Hobby: Mah-jongg, Gamble

Hidefumi YOSHIDAAYuji HISADOMI

Age:Hobby: Pachinko

Age:Hobby: Music, guiter

y(Japanese pinball )

Now, Let them introduce themselves !!

Bachelor students

Asami Nishida Yuta Matsuzaki Keitarou Hirata

Syota Kumamoto Yasuhiko Mori Gaku Matsunaga Eiichi Sugiyama

Yohei Hashizume Ippei Kaneko Yatsuya Maeda

Research ThemesResearch Themes of Road & Geotechnical Laboratory

Waste Landfill1. Settling Behavior and the Effect on Bottom Clayey Layer or Wastes

in Static Water for Coastal LandfillIn Japan, the remaining landfill capacity is still on downwards trend.Since it is getting difficult to secure the onshore (ground-based) landfillsite, coastal (sea-based) waste landfill is one of the predominant solutions to be expected.

The technical data and knowledge concerning this landfillmethod are currently quite limited.

The purpose of this study:

to establish the waste pouring method which doespouring method which does not harm seabed.

First step:One or two-dimensional settling behavior of group of

il t i l i t ti t h b i d isoil materials in static water has been examined using cylindrical container and/or earth tank.

Waste Landfill2. Applicability of Dehydrated Cake Produced

form Quarry to Impermeable Material with Heavy Metal Adsorption

For impermeable materials for landfill constructed at intermountain region, clayey materials supplied homogeneously and stably are required.

Focus on : Dehydrated Cake

H d l i dPrevious studies in our Lab

Hydrotalcite compound It was confirmed that the landfill standard regarding sealing work could be secured by the compaction oftwo kind of different dehydrated cakes with the

The examination has been carried out in terms of the f ll i h i

Zeolite Dolomite

yconstant condition of water content.

The water content and the degree of compaction onthe trafficability and permeability properties.

following three points.

Evaluation of long-time durabilityThis material has the heavy metal adsorption ability.

Effective Utilisation of By-products ad Ground Material1 Ground Improvement by Hemihydrate Plaster1. Ground Improvement by Hemihydrate Plaster

produced from Waste Plaster Board and its Safety

A number of waste plaster boards has been producedfrom newly-construction and demolition sites andi i i i l d ili ff i l

This research aims to establish the technical systems for the effective use of the regenerated hemihydrate plaster to construction supply such as neutral solidification

it is imperative to recycle and utilize effectively.

regenerated hemihydrate plaster to construction supply such as neutral solidification material.

The experimental approaches concerning the following topics have been conducted;The experimental approaches concerning the following topics have been conducted;Effect of the additive rate of solidification materialStrength development of materials associated with the elapse of curing dayEffect of the ground material improved by the hemihydrate plaster on the ground environment.

Effective Utilisation of By-products ad Ground Material2. Reuse and Recycling Method for Excavated Liquefied Stabilized Soil

Liquefied Stabilized Soil (LSS) represents a soil mixed cement, water and surplus soil.Liquefied soil stabilization method is one of the cement stabilization.

A li ti f LSSMerits : no compacting

decreased labor requirementshigher construction speed

Application of LSS

g plower in-place costs etc. Ex. Backfilling material of

buried pipe and common duct

It has to be taken into consideration that liquefied stabilized soil is often excavated duringq gthe maintenance and repair of lifelines such as gas, water and sewerage pipes after about 10 to 20 years.

In that case the excavated LSS will be regarded as wastewaste or surplussurplusIn that case, the excavated LSS will be regarded as wastewaste or surplus surplus soilsoil, since its mechanical characteristics and leaching properties will be unknown.

F th t i bl d l tFocus on the sustainable development

It is very important issue to investigate these mechanicalapplied liquefied soil stabilization methodapplied liquefied soil stabilization method againagain for excavated LSSfor excavated LSS.

It is very important issue to investigate these mechanical characteristics and leaching properties for reuse or recycle using the excavated LSS

3．New Repairing Material for Embankment using a Bottom SludgeEffective Utilisation of By-products ad Ground Material

of Old PondBottom sludge in pond causes

d d ti f d f ti l t t

111

degradation of pond functional status that decrement of reservoir capacityaggravation of water quality

1cm1cm1cm

Pond maintenance is imperative improvement of pond. Therefore, bottom sludge is dredged as a

As a result,

The water content of this dredged bottom sludge is too high to transport

measurement of function recovering.However,

The water content of this dredged bottom sludge is too high to transport.It becomes difficult to secure the landfill recently.

Bottom sludge is much desired effective utilisation at the place.g p

Therefore, in this research, ancillary material (Bamboo chips) is used to decrease water content from bottom sludge. Th i h d ili b l d iThen improvement method to utilise bottom sludge is suggested as the repairing material of embankment.

Development of Insolubilization Technique for Waste andExamination of Act for Assessment of Environmental Impacts1. Development of insolubilization technique for heavy metals included

in MSWI bottom (or fly) ash by the irradiation of ultraviolet rays In Japan MSWI ash is utilized to part of the cement material and

S i bl

In Japan, MSWI ash is utilized to part of the cement material andthe pavement material after melting and solidification of the ash.

But it’s quite limited.

Included a great amount of heavy metalDecrease of the capacity of the final disposal site

Serious problems

10

13

14

mg/

L)

The effective utilization with securing the safety of ash is essential.

p y p

A lt it l d th t l hi t ti f1

10

11

12

13

ntra

tion

of le

ad (m

pH

pH

Pb

This study examined insolubilization technique for heavy metalsincluded in MSWI ash by the irradiation of ultraviolet rays.

As a result, it was revealed that leaching concentration of lead from MSWI ash can be effectively reduced.

0.1 7

8

9

10

Leac

hing

con

cen b

Photocatalyzed reaction ?? 0 14 28 42 56L

Irradiation time (day)Photocatalyzed reaction ??

This study is conducting the further research about insolubilization mechanism.

Development of Insolubilization Technique for Waste andExamination of Act for Assessment of Environmental Impacts2. Proposal of Pre-treatment method with less uncertainty of Japanese LeachingTest No.46 (JLT46) Considering Effective Utilisation of WasteWhat is JLT46 ?JLT 46 prescribed by the Ministry of the Environment of Japan has been utilized as an official method in Japan. JLT 46 has been extensively utilized in order to investigate and evaluate the environmental quality standards for soil contamination.

In Japan, approximately 800 million tons of the MSWI bottom ash wasproduced. Most of the wastes were dumped to final disposal site.Recently, utilization of MSWI bottom ash has been required due to they, qdecrease of the capacity of the final disposal site.

Very important issueTo reveal the leaching property of MSWI bottom ash, including ag p p y , ggreat amount of heavy metals.

This study has taken up some work items which are considered to have an influence on the result of analysis (Bottle type Sample size Drying method Drying time Liquid-solid ratioresult of analysis (Bottle type, Sample size, Drying method, Drying time, Liquid-solid ratio, Void ratio and Direction how to shake), and then suggests the effective pretreatment method with few uncertainties.

Pavement1. Evaluation of Environmental Pavement at Faculty of Engineering, Fukuoka University

Our Labo

Pavement2. Development and Application of Pedestrian-friendly Pavement using Pressurised

Fl idi d B d C b i A h d B b ChiFluidised Bed Combustion Ash and Bamboo Chips

Case1 Case2 Case3 Case47c m

2 m

10 m

Case5

Evaluation item Measurement methodEvaluation items and examination methods of surveys

Decomposed granite soil

Hardness 1) Ground bearing capacity test

Skid 2) Skid resistance test

CrackCrack 3) Crack percentage (Sketch)) p g ( )

Surface character 4) Surfacing gravel fraction testand surfacing sand fraction test

Road surface temperature 5) Test for measurement of road surface temperature

PFBC ash

Road surface temperature 5) Test for measurement of road surface temperature

Walking comfort ( Elasticity ) 6) Golf ball test (GB test) and Steel ball test (SB test)

Environment assessment 7) Japanese leaching test (JLT46)Bamboo chips

Fundamental Research on Liquefaction and Mechanical Propertyof Soil1. Effects on Re-liquefaction Resistance Produced by

Changes in Anisotropy during LiquefactionA distinctive characteristic of the reliquefaction behavior ofA distinctive characteristic of the reliquefaction behavior of soils is that there are instances where the phenomenon of a sharp decrease in liquefaction resistance occurs in spite of increase in soil density caused by drainage of water after liquefaction.liquefaction.On the other hand, there have also been examples of increased liquefaction resistanceoccurring throughout a soil’s liquefaction history that cannot be explained merely bydensity increases.

These facts point to the existence of factors other than density that sway the liquefactionresistance of soils. The current paper demonstrates that, in fact, anisotropy is an importantfactor influencing liquefaction resistance.

1st 2nd 3rd 4th 5th

g q

In the process of verifying the above, we found that continuous and orderly changesin anisotropy are repeated with dizzying rapidity during liquefaction.

0

20

40

0

20

40

0

20

40

0

20

40

力 q

(kPa

)

1st（Dr=58.13%）

2nd（Dr=69.07%）

3rd（Dr=76.73%）

4th（Dr=82.76%）

0

20

40

5th（Dr=89.3%）

0 20 40 60 80 100 120-40

-20

0

平均有効応力 p' (kPa) 0 20 40 60 80 100 120

-40

-20

0

平均有効応力 p' (kPa) 0 20 40 60 80 100 120

-40

-20

0

平均有効応力 p' (kPa) 0 20 40 60 80 100 120

-40

-20

0

平均有効応力 p' (kPa)

軸差応力

0 20 40 60 80 100 120-40

-20

0

平均有効応力 p' (kPa)

Fundamental Research on Liquefaction and Mechanical Propertyof Soil2. Effects of Confining Pressure on Shear Behavior of Crushable Soils

When an offshore structure is constructed on crushable soils particle crushing can lead tocrushable soils, particle crushing can lead to various problems, like piles not being able to achieve enough bearing capacity.

We researched the effects oh the micro phenomenon of soil particle crushing onthe macro behavior of crushable soils based on elasto-plasticity

In this study

the macro behavior of crushable soils based on elasto plasticity.

Specifically, we researched one-dimensional compression behavior using the standard consolidation apparatus and effect of density and confining pressure on shear behavior usingconsolidation apparatus, and effect of density and confining pressure on shear behavior using the triaxial compression apparatus.

Shirasu (volcanic ash deposit) Molten slagDecomposed granite soil Calcareous platform

Thank you for your attention – any questions ?