LPT2 EXPRESSWAY PAKEJ 5A

KEMAMAN, TERENGGANU – MALAYSIA

STONE COLUMN Category: Infrastructure: Road

Developer: Jabatan Kerja Raya

Engineer: Amin & Teh S/B

Contractor: Ahmad Zaki S/B

Area /

Quantity:

5,600 m2

1,550 nos. of SC

Project site

PROJECT DESCRIPTION

Lebuhraya Pantai Timur Phase 2, (LPT2)

expressway is an extension of Lebuhraya Pantai

Timur (LPT1), Phase 1 (Karak to Jabur). Both of

this expressways are an extension of Kuala

Lumpur – Karak expressway. The length of this

LPT2 is 184 km beginning at Jabur until Kuala

Terengganu.

The proposed area for ground improvement

works is at Package 5A: Ch 55 800 to Ch 56000.

The exhibited design from Consultant is using

stone column works. Menard was invited to

optimise the design based on additional SI test

carried out at project site.

SOIL CONDITION / GEOTECHNICAL PROBLEM

Project soil profile:

A total of 3 nos. of pre-treatment cone

penetration test (CPT) was conducted to confirm

the existing ground condition. The subsoil

consisted in 8m thick soft silty clay (qc= 0.3

MPa). This site can be categorised as a former

valley with a soft layer at its bottom. The

embankment fill was 15.5m height. Ground

water level was found at existing ground level.

Existing site condition

Project specifications:

Stone column was designed to achieve

performance criteria according to JKR

requirements:-

• Total post settlement shall not exceed

than 40 cm

• 5 years total post settlement shall not

exceed 25 cm, following the opening

highway for public use

• Max. differential settlement 1:750

• Short and long term FOS for stability

shall remain higher than 1.25 and 1.5

respectively

MENARD SOLUTION

Optimization of cost saving was an

important criterion in this project, while

achieving all criteria stated by JKR.

The additional pre-CPT tests allowed to

better defined the Site conditions and

allowed to refine the spacing and length of

the SC. The resulting cost saving was in

the range of RM330,000.

SC works progress

This project was started in December

2007 and completed in May 2008 (5

months production period).

project site