EKVE Expressway slope protection: 39.5 km, 450,000 m² stabilised.
The East Klang Valley Expressway (EKVE) is a 39.5 km federal toll expressway connecting the North-South Expressway at Sungai Long with the Karak Highway at Bukit Beruntung / Genting Sempah, running along the eastern edge of the Klang Valley. Infraconcrete delivered approximately 450,000 m² of slope face stabilised using all six in-house specialist systems: soil nailing, guniting / shotcrete, rock bolting, rockfall barriers, retaining walls, and horizontal drains. Live-traffic phasing under the highway authority's traffic management framework. JKR / LLM-grade documentation across the full alignment.
Federal toll expressway, eastern Klang Valley.
The East Klang Valley Expressway (EKVE) is a strategic federal highway built to alleviate congestion on the Middle Ring Road 2 (MRR2) and the existing Karak Highway approach into Kuala Lumpur. The alignment runs along the eastern flank of the Klang Valley, connecting the southern end at Sungai Long (NSE interchange) with the northern end at Bukit Beruntung / Genting Sempah (Karak Highway), passing through Kajang, Cheras, Hulu Langat, Ampang, and Gombak districts in Selangor and Wilayah Persekutuan Kuala Lumpur.
The corridor traverses hilly terrain along the foothills of the Titiwangsa Range. The alignment requires extensive cut slope geometry through weathered granitic and meta-sedimentary residual soil, with localised exposed-rock sections, monsoon-recharged groundwater regimes, and several long high cuts (greater than 30 m face height). Cut-and-cover, viaduct, and at-grade sections were all delivered with adjacent slope works. Operated as a tolled concession under LLM (Lembaga Lebuhraya Malaysia) regulation.
Three things made this hard.
1. Scale and consistency
450,000 m² of slope face across 39.5 km of alignment, dozens of discrete cut zones with different geometries, ground conditions, and adjacent constraints. Maintaining consistent quality, method statement compliance, and ITP discipline across that scope required a single-team accountability framework rather than the typical multi-subcontractor approach.
2. Live-traffic phasing
Substantial portions of the slope works were carried out adjacent to operational lanes. Lane closures had to be staged under LLM and concessionaire approval, off-peak, often single-direction-at-a-time on dual carriageways, with the drilling-grouting-mesh-shotcrete sequence phased so no stage left the face unstable overnight. No fatality, no major lane-closure event across the programme.
3. Monsoon-driven groundwater
The Klang Valley monsoon regime drives substantial groundwater recharge into hillside cut slopes. Several alignments showed pre-construction seepage signatures from natural springs and weathered-rock joint flow. The drainage scheme had to anticipate post-construction groundwater conditions, not just the as-cut profile. Sub-horizontal drains went in alongside the surface drainage to lower the body groundwater table behind the face.
Composite design intent
No single specialist system was sufficient. Most sections combined soil nailing + shotcrete face + sub-horizontal drainage + rockfall protection where rock cuts exposed loose blocks. Several zones combined ground anchors (for high walls) with mesh-and-shotcrete face above. The integrated design called for a single integrated installer rather than separate trade subcontractors.
Six in-house systems, one team.
Soil nailing
The primary reinforcement across most cut slopes. Y20 to Y32 deformed bar and self-drilling hollow bar (R32, R38) where ground required. Nail length 6 to 15 m typical, 1.5 to 2.0 m grid, 15 degree inclination, hot-dip galvanised for permanent works in non-aggressive ground, DCP where aggressivity tests required. Top-down 2.0 to 3.0 m lift sequence. Pull-out tests on 5 to 10 percent of production nails per BS 8081.
Guniting / shotcrete
Structural face on soil-nailed and rock-bolted slopes. Wet-mix shotcrete to 75 to 150 mm thickness with BRC welded mesh A98 or A142 reinforcement. ACI 506 / BS EN 14487 compliant. Fibre-reinforced shotcrete (E700 energy class) at portal zones and high-stress areas. ACI CP-60 certified nozzlemen, alkali-free accelerator at 5 to 10 percent cement mass.
Rock bolting
Tensioned and grouted rock anchors on exposed rock cuts and tunnel-portal-style sections. Y25 to Y32 bar, 3 to 8 m length, 1.5 m grid, cement grout. Combined with mesh and shotcrete face for integrated rock-bolt-plus-shotcrete protection.
Rockfall barriers
Energy-rated flexible barriers (typical 500 to 2000 kJ range for EKVE corridor) at locations with above-grade rock-face hazard and live-traffic consequence below. Drape mesh and active anchored mesh on smaller rock cuts. To ETAG 027 / EAD 340059 certification framework.
Retaining walls
RC cantilever walls at tight-footprint cut sections, MSE walls (with StrataGrid PET geogrid supplied via Starwall) on fill embankments and bridge approach abutments. Height range 3 to 15 m typical. Cast-in-place panels and modular block facing per section spec.
Horizontal drains
Sub-horizontal drains 30 to 60 m length drilled at 3 to 5 degree upward inclination into the slope body, slotted UPVC pipe with geotextile filter sock. Lowering the groundwater table behind the face improved factor of safety and reduced the seepage-driven distress that monsoon recharge would otherwise have caused. Piezometer monitoring on selected sections.
JKR / LLM-grade delivery.
- Design standards: JKR Slope Engineering Manual, JKR-SPJ for Road Works, LLM Highway Specifications, BS 8006-2 (soil nail walls), BS EN 14490 (soil nailing execution), BS 8081 / BS EN 1537 (ground anchors), BS EN 14487-1/-2 (sprayed concrete), ACI 506 (shotcrete), ETAG 027 / EAD 340059 (rockfall protection), FHWA-NHI-14-007 (soil nail walls), AASHTO LRFD.
- Submittals per section: design calculations, design drawings, method statement, ITP (Inspection and Test Plan), HIRARC, traffic management plan (TMP) for live-traffic sections, material certificates of conformance, mix design submissions, trial panel records for shotcrete, pre-production pull-out test records for soil nails.
- Quality control during installation: drill log per nail (depth, time, ground response), grout mix daily QA (Marsh cone flow, density, cube strength), bearing plate and mesh as-installed records, shotcrete thickness verification by depth probes, pull-out test records per BS 8081, daily inspection records signed by the consultant's resident engineer.
- As-built documentation: as-built drawings showing nail and anchor positions, drain locations, retaining wall geometry, all materials and supplier certificates, complete test record by section, monitoring readings on instrumented sections. Submitted to consultant and LLM for permanent record.
Federal expressway, delivered.
Approximately 450,000 m² of slope face stabilised across the 39.5 km alignment, delivered without halting traffic on operational sections, with no safety incident, and meeting LLM / JKR documentation standards across the programme. The integrated single-team approach (soil nailing, shotcrete, rock bolting, drainage, rockfall protection, retaining walls all delivered in-house) held the programme tight and avoided the typical inter-vendor handoff delays that would have characterised a multi-subcontractor approach to the same scope.
EKVE established Infraconcrete's federal-panel credibility for subsequent tier-1 scopes, including ECRL Section 3 rail-corridor slope works and Central Spine Road. The EKVE delivery is one of the largest single-contractor slope protection scopes by area in recent Malaysian federal infrastructure works.
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Other federal projects
→ ECRL Section 3 (64 km rail, 320,000 m drilled)
→ Central Spine Road (65,000 m²)
→ Pan Borneo Highway (Sabah / Sarawak)
Capabilities used on EKVE
Soil Nailing · Guniting · Rock Bolting · Rockfall Barriers · Retaining Walls · Horizontal Drains
Sector pages
Engineering reference
→ Tropical Residual Soil Guide
→ Climate & Monsoon Engineering