Mata kuliah : S0892 – Ground Improvement MethodTahun : 2010

Case Study Session 12 - 13

Bina Nusantara

COURSE 5

Content:• Case Study 1 – Jordan Hall of Science

University of Notre Dame• Case Study 2 – Commercial Complex Kuala

Lumpur City• Case Study 3 – Interchange at Kampung

Pasir Dalam Malaysia• Case Study 4 – Road Construction Thailand

Bina Nusantara

CASE STUDY 1

LOCATION

Bina Nusantara

CASE STUDY 1

Bina Nusantara

CASE STUDY 1

PROJECT REQUIREMENTS

• Four-story building with slab on-grade and small basement area for mechanical

• Structural concrete and steel framing with concrete masonry units and brick facade/cast stone detailing

• Column loads: 800 to 1,000 kips • Building footprint of 75,000 sq ft. • Two 250 – seat lecture halls • Greenhouse • Teaching labs • Office Space • Roof top observatory • Existing utility tunnel

Bina Nusantara

CASE STUDY 1

GENERALIZED SUBSURFACE PROFILE

Bina Nusantara

CASE STUDY 1

FOUNDATION ALTERNATIVES

• Spread Foundation Scheme – 2 ksf – 1 to 2 in. settlement

• Deep Foundation Scheme (driven or drilled elements) • Ground Improvement Technique

– Vibro-compaction and use spread foundations designed for 10 ksf with 1/2 in. settlement

GROUND IMPROVEMENT WAS CHOSEN

Bina Nusantara

CASE STUDY 1

Bina Nusantara

CASE STUDY 1

Bina Nusantara

CASE STUDY 1

Bina Nusantara

CASE STUDY 1

Bina Nusantara

CASE STUDY 1

Bina Nusantara

CASE STUDY 1

Bina Nusantara

CASE STUDY 1

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CASE STUDY 1TREATMENT RESULTS

BEFORE AFTER

Bina Nusantara

CASE STUDY 2

LOCATION

Bina Nusantara

CASE STUDY 2

Soil Condition

• The subsoil comprised of loose silty sand deposits and ex-mining soils with SPT values in the range of 5 blows/ft to 12 blows/ft.

• Underlying this loose soil layers, karstic limestone formation was found with extremely varying rock-head levels ranging between 3m and 15m below existing ground level. Overhanging boulders and pinnacles are common; hence the founding level of the bedrock formation was unpredictable.

• The ground water table was found to be at about 1m to 2m below existing ground level.

Bina Nusantara

CASE STUDY 2

Bina Nusantara

CASE STUDY 2

EXECUTION OF DSM WORK

Bina Nusantara

CASE STUDY 2RESULT• Excavation works proceeded upon

completion of DSM installation works and subsequent curing period of only 14days.

• Bedrock underneath the DSM columns was excavated using the hydraulic breaker and blasting works.

• The installed DSM columns were able to withstand the high vibration induced by rock excavation works.

• As part of quality control procedure, cores from DSM columns were extracted and tested in a laboratory for UCS. The test results indicated an UCS in the range of 1MPa to 3MPa.

• In addition, wall movement was monitored during excavation works, which showed a maximum horizontal movement of about 30mm to 40mm.

Bina Nusantara

CASE STUDY 3

LAYOUT

Bina Nusantara

CASE STUDY 3

Bina Nusantara

CASE STUDY 3

STONE COLUMN

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CASE STUDY 3

Bina Nusantara

CASE STUDY 3

Bina Nusantara

CASE STUDY 4

Location : South Thailand

Purpose : Road Construction

Ground Improvement Type : Jet Grouting

Type of Nature Soil : Soft Clay

Bina Nusantara

CASE STUDY 4

Bina Nusantara

CASE STUDY 4

TYPICAL CROSS SECTION

Bina Nusantara

CASE STUDY 4

CONSTRUCTION PROCESS

Bina Nusantara

CASE STUDY 4

Bina Nusantara

CASE STUDY 4

Unconfined compressive strength test results of core samples from the jet grouted piles exceed the design target value of 600 kPa.