Plat form preparation for solar farmMinimize environmental and drainage impact from ground elevation changing Follow natural terrain to avoid over cut and fill to shorten time and cost of construction

TOPLargest Solar Farm in Asian90 MW in Lampang Thailand

RIGHTFloating Solar Farm in Thailand

PV module sub-structure along natural terrain

PV module sub-structure along natural terrain

PV module sub-structure along natural terrain

Installation in non flat ground

PV module sub-structure along new proposed grade

Method of compaction 1.2.3. METHODOLOGY 1.2.3.1 Suitable soil free of topsoil and organic from cut area will be used

for backfilling to meet the required grade (level).1.2.3.2 Thickness of compact layer and method of compaction shall be

proposed by contractor to meet the minimum density not less than in-situ density during soil investigation that was used for the design of pile.

Trail section in area 8x15 m. is required which record of type,weight of compaction equipment, no of passing and thickness ofcompaction layer. As soon as compaction was completed, fielddensity test to shall be conducted to compare compacted density within-situ density underneath the platform.

1.2.3.3 Once the final grade was reached from both backfilling and cutting, PV module pile is to be installed as a so call “Pilot Pile”

1.2.3.4 The Pilot Pile shall be tested to proof the bonding capacity between compacted soil and pile shaft as follows;1.2.3.4.1 Compression test up to 200% of the design load as per

ASTM D-1143-81 “Standard Test Method for Piles under Static Axial Compressive Load” or equivalent standard.

1.2.3.4.2 Tension (pull out test) test up to 300% of the design loadas per ASTM D-3689-90 “Standard Test Method for Individual Piles under Static Axial Tensile Load” or equivalent standard.

1.2.3.4.2 Lateral test up to 200% of the design loadas per ASTM D-3966-90 “Standard Test Method for IndividualPiles under Lateral Load” or equivalent standard.

In plasticity soil, test area shall be kept in saturated condition to simulate swelling effect.

Test pile failure is considered when movement in any direction isgreater than 25 mm.

Should any in pile load test fail, the earthwork shall be scarified and re-compacted until pile test pass all tests.

Over compacted in multiple thin layer soil

Require more soil to backfill

Over compacted in multiple thin layer soil

Will change soil permeability to be impervious. Storm flow across site is faster and cause more erosion.

Over compacted in multiple thin layer soil

Prevent pile penetration to the desired depth.

(inadequate length for pull out resistant +lateral resistant)

SOLAR FARM IN FLOOD PLAIN(DIKE +DETENTION POND WHEN DISCHARGE POINT AVAILABLE)

No soil back filling is required Internal drainage management to

detention pond with the aid of pump to discharge point outside

Control of interference of high ground water table to pond by HDPE liner and sub-drain

SOLAR FARM IN FLOOD PLAIN(DIKE +DETENTION POND WHEN DISCHARGE POINT AVAILABLE)

ELEVATED SOLAR FARM IN FLOOD PLAIN (WHERE NO DISCHARGE POINT AVAILABLE)

From prawn farm to solar farm.Petchaburi,Thailand

SOLAR FARM IN SINKING LAND

SOLAR FARM IN SINKING LAND

SOLAR FARM IN SINKING LAND

ELEVATED SOLAR FARM IN FLOOD PLAIN WHERE NO DISCHARGE POINT

Piling in heavy building , sub-station ,main station, control office etc.No piling required in PV module area(light weight structure subjected to wind load(pull out force)

SOLAR FARM IN SINKING LAND

Crest of dike need to be monitored yearly to observed long term settlement IEAT standard requires crest width 2.5 m. for plant access to allow plant maintenance by filling dike crest to original height

SOLAR FARM IN SINKING LAND