LEIGHTON

DESIGN

CALCULATIONS

0 3-Dec-13 RNO FUP

REV DATE REVISION DESCRIPTION CHK AUTH

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CONTRACT TITLE :

SUBJECT :

EXCAVATION SUPPORT USING SHEET PILE AS RETAINING WALL

DESIGNED BY : ALR

CHECKED BY : RNO

AUTHORISED BY : FUP

DATE : 3-Dec-13 CALC. NO.: P1120/DC/013

Doc. No. QMS F050; Rev. No. 0; 01.07.03

FOR CONSTRUCTION

P1120-THERMA SOUTH ENERGY UNITS 1 & 2

ITEM: P1120: Therma South Energy Units 1 & 2 Design Criteria and Calculations- EXCAVATION SUPPORT USING SHEET PILE AS

RETAINING WALL

Calc. No : P1120/DC/013

Sheet No. 1 of 9

REF.

CALCULATIONS

Doc. No. QMS F051; Rev. No. 0; 01.07.03

Design Brief `

Constructions of septic vaults on site were changed to pre-cast rather than in-situ. Each location was found short in space to perform open excavation. Engineering department opted to use sheet piles retaining wall to each excavation. Walls and struts are used which are reflected to shown computations. Design was based as per latest edition of National Structural Code of the Philippines 6th edition (NSCP 2010). Load combinations are as per Strength Design (LRFD) with adequate factor of safety.

Assumption and Design Concept

Geotechnical soil properties are as per Onshore Geotechnical Design Basis Report of TSE PROJECT UNITS 1 & 2 2x150 MW Coal-fired power plant

Free Earth Method used for sheet pile analysis

Design Loads 1. Dead Loads

Dead Loads are as per transferred forces based from idealized soil strata shown in the computations below

2. Live Loads

Surcharge Load 30 kPa 3. Wind Load

Wind Loads will not be considered for the analysis

4. Earthquake Loads

EQ Loads will not be considered for the analysis Design Parameters

1. Materials

FSP IV (Fy) 294.3 Mpa

2. Others

Load Combination using Allowable Stress Design (ASD) D + F (203-8) D + H + F + L + T (203-9) D + H + F + (Lr or R) (203-10) D + H + F + 0.75[L + T + (Lr or R)] (203-11) D + H + F + (W or E/1.4) (203-12)

ITEM: P1120: Therma South Energy Units 1 & 2 Design Criteria and Calculations- EXCAVATION SUPPORT USING SHEET PILE AS

RETAINING WALL

Calc. No : P1120/DC/013

Sheet No. 2 of 9

REF.

CALCULATIONS

Doc. No. QMS F051; Rev. No. 0; 01.07.03

ITEM: P1120: Therma South Energy Units 1 & 2 Design Criteria and Calculations- EXCAVATION SUPPORT USING SHEET PILE AS

RETAINING WALL

Calc. No : P1120/DC/013

Sheet No. 3 of 9

REF.

CALCULATIONS

Doc. No. QMS F051; Rev. No. 0; 01.07.03

ITEM: P1120: Therma South Energy Units 1 & 2 Design Criteria and Calculations- EXCAVATION SUPPORT USING SHEET PILE AS

RETAINING WALL

Calc. No : P1120/DC/013

Sheet No. 4 of 9

REF.

CALCULATIONS

Doc. No. QMS F051; Rev. No. 0; 01.07.03

ITEM: P1120: Therma South Energy Units 1 & 2 Design Criteria and Calculations- EXCAVATION SUPPORT USING SHEET PILE AS

RETAINING WALL

Calc. No : P1120/DC/013

Sheet No. 5 of 9

REF.

CALCULATIONS

Doc. No. QMS F051; Rev. No. 0; 01.07.03

ITEM: P1120: Therma South Energy Units 1 & 2 Design Criteria and Calculations- EXCAVATION SUPPORT USING SHEET PILE AS

RETAINING WALL

Calc. No : P1120/DC/013

Sheet No. 6 of 9

REF.

CALCULATIONS

Doc. No. QMS F051; Rev. No. 0; 01.07.03

ITEM: P1120: Therma South Energy Units 1 & 2 Design Criteria and Calculations- EXCAVATION SUPPORT USING SHEET PILE AS

RETAINING WALL

Calc. No : P1120/DC/013

Sheet No. 7 of 9

REF.

CALCULATIONS

Doc. No. QMS F051; Rev. No. 0; 01.07.03

ITEM: P1120: Therma South Energy Units 1 & 2 Design Criteria and Calculations- EXCAVATION SUPPORT USING SHEET PILE AS

RETAINING WALL

Calc. No : P1120/DC/013

Sheet No. 8 of 9

REF.

CALCULATIONS

Doc. No. QMS F051; Rev. No. 0; 01.07.03

ITEM: P1120: Therma South Energy Units 1 & 2 Design Criteria and Calculations- EXCAVATION SUPPORT USING SHEET PILE AS

RETAINING WALL

Calc. No : P1120/DC/013

Sheet No. 9 of 9

REF.

CALCULATIONS

Doc. No. QMS F051; Rev. No. 0; 01.07.03

P1120_CALCSCOVERP1120_DC_013 Design and Computations Final