ENGINEERING SOLUTION PROPOSAL. SHORED MECHANICALLY
STABILIZED EARTH WALL. 

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SHORED MECHANICALLY
STABILIZED EARTH WALL

Joram–Koloriang Road (NH-713)
Valley-side road widening & slope protection

Prepared for: NHIDCL / Project Stakeholders
Prepared by: Geosynthetic Expert & Gabion Works
Document status: Client presentation based on supplied design report, drawings and survey

JORAM–KOLORIANG ROAD (NH-713) | ARUNACHAL PRADESH. 

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JORAM–KOLORIANG ROAD (NH-713) | ARUNACHAL PRADESH

SMSE WALL & SLOPE PROTECTION — ONE-PAGE DESIGN SUMMARY

Valley-side widening for a two-lane road with paved shoulders; steep terrain, restricted right-of-way and limited construction access.

Shoring + reinforced soil/geogrid + gabion fascia, combined with Ø32 mm SDA anchors, high-tensile mesh and drainage.

Layout shows Ch. 0+000–0+240; alignment follows curves near Don Bosco Hostel, Don Bosco Road and Don Bosco School.

10×12 cm mesh; 2.7/3.7 mm wire; Zn + PVC coating

150–250 mm hard angular stone; stated crushing strength >300 kg/cm²

Geogrid layers; strength varies by elevation in report

Ø32 mm galvanized SDA; 2.0 m c/c both ways; 100×120 mm Zn + PVC mesh

6° overall batter; geocomposite drain sheet + half-perforated PVC pipe

SW soil / weathered rock; SPT N > 100 reported

γ = 19 kN/m³; φ′ = 30°; c′ = 0 kPa (soil/ground)

Surcharge 36 kN/m²; A = 0.240; Kh = 0.290 in MSEW input

20 m seismic stage: FOS 1.29 — confirm acceptance criterion / final case mapping.

1  Setting-out, services & temporary works  →  2  Shoring / slope preparation  →  3  Layered fill + geogrid  →  4  Gabion fascia + drainage  →  5  Anchors + mesh  →  6  Material certificates, compaction records, specified tests & as-built survey

• Compact valley-side system can reduce hill cutting and support the widened formation.
• Reconcile chainage: report states Km 59+250–59+450, while survey layout states Ch. 0+000–0+240.
• Match survey sections to wall IDs; verify borehole coverage, ground/water variability, final FOS case mapping and approved drawings before construction.

BASIS: Supplied 22-slide presentation, design report, drawings and survey. Values are transcribed from the supplied deck; confirm against approved calculations and IFC drawings before execution.

Site Introduction & Engineering Need. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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JORAM–KOLORIANG ROAD (NH-713)  |  SMSE WALL & SLOPE PROTECTION

Project: balance work of two-lane road with paved shoulders on Joram–Koloriang Road (NH-713), Arunachal Pradesh. Design chainage stated in report: Km 59+250 to Km 59+450. Terrain: mountainous / valley-side alignment with steep slope and restricted formation width. Existing road width is reported inadequate for the proposed two-lane road with paved shoulders. Conventional widening would require significant hill cutting or a larger valley-side footprint.

Site photographs reproduced from the supplied design report, page 5. Verify photo date and current site status.

Site Constraints Driving the Design. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Road edge close to steep valley-side drop; limited room for a conventional retaining footprint.

Hill on one side and valley on the other constrain horizontal expansion.

New formation must maintain stability of widened pavement and the existing slope.

Staged work and temporary support are important in a narrow mountain corridor.

Constraints summarised from the supplied report’s Project Description and Site Visit section.

Our Solution at a Glance. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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A constrained valley-side widening problem needs a compact retaining system and active protection of the existing hill slope.

Shored reinforced-soil structure to support the widened roadway within restricted right-of-way.

Active reinforcement and high-tensile mesh to help control local slope instability and rockfall.

Provide drainage details and outlets to reduce water-related pressures and erosion.

The solution and analysis values in this presentation are taken from the supplied documents; drawing and report status should be confirmed before construction.

Why SMSE Wall? Space Efficiency: Minimises footprint for constrained mountain roads. Load Distribution: Reinforced soil effectively supports the widened road formation. Flexibility: Accommodates minor differential settlements in challenging terrain. Construction Suitability: Segmented construction adapts to site geometry and provides a stable retaining face Conclusion The proposed valley-side SMSE wall is a technically suitable solution for the Joram–Koloriang road widening project, enabling the required road width while improving slope stability, safety and long-term infrastructure performance.

Current Survey — Alignment & Coverage. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Site Layout & Protection Work Summary
 Project Stretch: Starting Point Ch. 0+000 to End Point Ch. 0+240 (as indicated in the layout).
 Protection Work: Proposed along the identified road stretch, following the existing road alignment and curves.
 Key Locations: Don Bosco Hostel, Don Bosco Road and Don Bosco School.
 Alignment: The layout follows the existing road geometry, including curved sections and adjoining site features.
 Objective: To provide slope/roadside protection while accommodating the existing alignment and surrounding infrastructure.

Survey Interpretation & Design Use. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Representative cross-sections from the supplied survey set

Cross-sections are to be matched to wall chainage and design section IDs before quantity finalisation.

Proposed Solution — Integrated System. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Key Benefits of the Proposed Valley-Side SMSE Wall - Road Widening: Achieves the required carriageway width within the constrained mountain corridor. - Reduced Hill Cutting: Minimises excavation and disturbance to the existing hillside. - Enhanced Stability: Geogrid reinforcement, gabion fascia and soil anchors support the widened road and adjacent slope. - Efficient Land Use: Provides a compact retaining solution with a near-vertical face. - Effective Drainage: Helps control seepage and water-pressure build-up. Overall: A space-efficient solution for safer road widening with reduced hill cutting and improved slope stability.
 SMSE wall with reinforced fill, geogrid reinforcement and gabion fascia.

Benefits of SMSE Wall at Box Culvert (Ch. 0+070)
 Road Widening: Maintains the required 12 m road formation. Space Efficiency: Minimises the valley-side footprint. Structural Stability: Geogrid and gabion fascia support the road embankment. Slope Protection: Anchors and rockfall mesh stabilise the adjacent hillside. Effective Drainage: Reduces water accumulation through drainage provisions.
 Overall: Integrates road widening, culvert continuity and slope stabilisation within the constrained mountain corridor.

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Technical Design Concept. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Provides temporary excavation support and helps retain the existing ground during staged construction.

Geogrid layers and selected granular fill form a reinforced mass behind the fascia.

Double-twisted wire mesh gabion units provide a flexible, segmented face.

Soil nails / self-drilling anchors and mesh reinforce the near-surface slope and support face material.

Geocomposite drainage and perforated pipe details provide drainage pathways as specified.

Exact interface, reinforcement lengths and drainage layout must follow the approved design drawings and site-specific checks.

Proposed Drawing — Typical Sections. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Key Technical Details in the Submitted Drawings. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Key Technical Details in the Submitted Drawings

Component Drawing specification / design detail Design role Gabion fascia Mesh type 10×12 cm; wire dia. 2.7/3.7 mm (I.D./O.D.), Zn + PVC coated Segmental facing / protection Gabion stone fill 150–250 mm hard, angular stones; stated crushing strength >300 kg/cm² Mass and face stability Geotextile Non-woven, 150 GSM Separation and filtration between gabion and reinforced soil Geogrid Reinforced geogrid; product strength varies by elevation in design report Internal reinforcement of soil mass SDA anchors Ø32 mm, fully threaded and galvanized; 2.0 m c/c vertical and horizontal Slope reinforcement / mesh anchorage Mesh Double-twisted hexagonal steel wire mesh, 100×120 mm, Zn + PVC coated Surface retention / local protection Batter 6° overall batter by offsets between layers Wall geometry / stability criteria Drainage Geocomposite drain sheet and half-perforated PVC pipe detail Manage seepage / drainage

Design Inputs & Considerations. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Input Value shown in calculation report Application Reinforced fill γ = 19 kN/m³; φ′ = 30° Internal stability Retained soil γ = 19 kN/m³; φ′ = 30° Earth pressure Foundation / ground model γ = 19 kN/m³; φ′ = 30°; c′ = 0 kPa External / global stability Breast wall γ = 24 kN/m³; φ′ = 32°; c′ = 0 kPa Model material Gabion γ = 22 kN/m³; φ′ = 32°; c′ = 0 kPa Model material Seismic input A = 0.240; design Kh = 0.290 in MSEW input Seismic design case Surcharge 36 kN/m² strip surcharge shown in 20 m model Traffic / surcharge case

Ground Conditions: The investigation identifies SW soil (well-graded sand with gravel) and/or weathered rock, consistent with a dense, high-resistance ground profile.
 High Penetration Resistance: SPT refusal (N > 100) indicates very dense material or weathered rock at the tested locations.
 Design Parameters: Cohesion of 0 kPa and friction angle of 30°–32° are adopted as reported for granular soil and supported by direct shear test results.
 Groundwater: No groundwater table was encountered during the investigation.
 Design Application: These parameters provide the geotechnical basis for evaluating slope stability, SMSE wall performance, retaining structures and foundation conditions.
 Design Consideration: Confirm that borehole locations, investigated strata and adopted parameters correspond to each proposed wall section. Weathered rock variability and groundwater changes should be considered during detailed design and construction.

Design Checks & Failure Modes Considered. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Potential slip surface passing behind and beneath the combined SMSE system.

Geogrid tensile strength, pullout resistance and connection strength.

Bearing capacity, direct sliding and eccentricity.

Potential failure along the shoring–reinforced-soil interface or through combined components.

Separate seismic load cases and reduced acceptance criteria as defined in the calculation report.

Temporary / staged states checked separately from the completed wall.

Global Stability — Reported Results. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Model height Stage / condition Reported FOS Criterion in report Reported status 10 m Stage 1 — unsupported permanent 0.12 1.50 Not acceptable 10 m Stage 2 — supported permanent 1.51 1.50 Acceptable 10 m Stage 3 — permanent (later stage) 1.57 1.50 Acceptable 10 m Stage 4 — seismic 1.31 1.10 Acceptable 18 m Supported permanent stage 1.66 1.50 Acceptable 18 m Stage 4 — seismic 1.15 1.10 Acceptable 20 m Stage 3 — permanent 1.72 1.50 Acceptable 20 m Final seismic stage 1.29 1.10 Acceptable

Reported GEO5 / Bishop circular-slip outputs

The report shows initial unsupported stages below the required criterion, followed by acceptable supported stages in the cited cases.

Stage labels and FOS values transcribed from report pages 34, 37, 47, 54, 124, 129, 154 and 160. Confirm final case mapping before client issue.

Analysis Evidence — Critical Slip Surfaces. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Analysis Evidence — Critical Slip Surfaces

10 m model — supported permanent stage, FOS 1.51

18 m model — supported permanent stage, FOS 1.66

Original analysis output screenshots are included for traceability; the full calculation report remains the governing record.

Analysis Evidence — Higher Wall Models. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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20 m model — final seismic stage, FOS 1.29

Bearing capacity calculation in the 10 m model reports σv = 226 kPa versus qa = 461.04 kPa (report page 28); confirm relevance to each section.

Advantages of the Proposed Solution. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Supports road widening where the valley-side working width is constrained.

Can reduce the need for extensive excavation compared with a conventional widening approach.

Geogrid reinforcement mobilises a composite reinforced soil mass.

Gabion fascia accommodates local deformation better than a rigid monolithic face, subject to design limits.

Anchors and mesh address local surface instability and help retain loose material.

Shoring-led construction can help manage restricted access and construction sequencing.

These are system-level advantages described or implied by the supplied report; project-specific cost and schedule savings are not quantified in the submitted documents.

Construction Concept & Quality Hold Points. JORAM–KOLORIANG ROAD (NH-713) | SMSE WALL & SLOPE PROTECTION. 

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Construction Concept & Quality Hold Points

Verify setting out, existing services, temporary works, approved materials and work sequencing.

Execute approved shoring and slope-preparation stages with safe access and monitoring.

Place approved granular fill in controlled layers; install geogrid and face connections to drawings.

Install gabion fascia, geotextile, drainage composite and pipe/outlet details.

Install Ø32 mm SDA and mesh at specified spacing; record drilling, grouting and installation data.

Material certificates, compaction records, tests specified by contract, as-built survey and close-out.

Final sequence, test frequencies and acceptance limits must follow approved method statement, specifications and temporary works design.

A PRACTICAL ENGINEERING SOLUTION FOR A CONSTRAINED CORRIDOR. 

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A PRACTICAL ENGINEERING SOLUTION FOR A CONSTRAINED CORRIDOR

SAFER WIDENING.
CONTROLLED SLOPE.
ENGINEERED PERFORMANCE.

SMSE wall + reinforced soil + gabion fascia + anchored mesh protection

Client Solution Presentation — SMSE Wall, Joram–Koloriang Road

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