Gabion Wall Design as per IS Code

Which Indian codes apply

There is no single “IS code for gabion wall design”. In India the work is split across a handful of documents, and a complete design uses all of them:

So: design to IRC:SP:116, build hill walls to IS 14458 Part 6, and specify the boxes to IS 16014. The rest of this guide follows that order.

How a gabion wall works

A gabion retaining wall is a gravity wall: its own weight — wire mesh boxes packed with stone — resists the push of the soil behind it. It has three working parts: the gabion boxes (usually 1 m or 0.5 m high, laced together), the stone fill, and a filter and compacted backfill behind the wall.

Because the units are flexible and free-draining, a gabion wall tolerates settlement without cracking and does not build up water pressure behind it. That is why IS 14458 recommends gabion walls where the ground may become saturated or the foundation is compressible — debris, fill and unconsolidated material.

Design inputs

Before sizing anything, IRC:SP:116 (clause 6) lists what has to be known: the foundation soil and retained soil properties, drainage conditions, the rock available for filling, the loading (traffic, slope above, water), the seismic zone, and the porosity the filled gabions will reach. Base width, embedment, batter and the extent of backfill then follow.

Proportions: base, top, embedment and batter

H is the full height of the wall including the part below ground. These are starting proportions for a trial section — the final section is whatever passes every check below.

Loads

• Earth pressure by Coulomb’s method, the active thrust acting at H/3 above the base (IRC:SP:116 cl 6.5, 6.9).
• Traffic surcharge equal to 1.2 m of extra earth, as IRC:6 requires (cl 6.5).
• Earthquake: horizontal acceleration from the seismic zone per IS 1893; vertical acceleration neglected, and only half the dynamic increment of earth pressure taken, because the wall is flexible (cl 6.5).
• Water: uplift where the wall is partly or fully submerged (cl 6.10).
• Weight of the wall: design porosity of no more than 40% (cl 6.6). With stone at 26 kN/m³ and 35% voids, filled gabions weigh about 16.9 kN/m³ (IS 14458-6 cl 7.4).

Stability checks and factors of safety

IRC:SP:116 Table 15 sets the minimum factors of safety:

• Sliding (cl 6.10): the friction at the base must resist the horizontal thrust. The friction coefficient between a gabion and the soil is typically tan φ′, in the range 0.5–1; take it 15% lower where a non-woven geotextile lies under the base.
• Overturning (cl 6.11): the restoring moment — the wall’s weight, soil on the steps, the vertical part of the thrust — must be at least twice the overturning moment.
• Bearing (cl 6.12): the resultant must fall in the middle third of the base (eccentricity e ≤ B/6), and the peak pressure q_max = N/B × (1 + 6e/B) must stay within the allowable bearing pressure. On cohesive ground, lay 300–500 mm of granular base and allow for settlement.
• Internal stability (cl 6.13): each course is checked against sliding over the one below, using the thrust on the part of the wall above it.
• Global stability: a slip surface passing under and behind the whole wall — often the governing check on hill slopes.

Typical sections

The Ministry of Rural Development’s guide Gabion Retaining Walls for Rural Roads (2015) shows typical sections built from 1 m high courses, battered at 6°, with 1 m below ground and a non-woven geotextile behind:

Measured against the full height including the 1 m below ground, each base comes to about 0.63–0.7 × H — inside the IRC:SP:116 range. Use them to check a drawing or a BOQ quantity, not in place of a design for your soil.

Stone fill

• IRC:SP:116 (cl 4.2): hard, durable stone 1.5–2.5 times the mesh opening, hand-packed with the long side horizontal; up to 5% over- and 5% undersize.
• IS 14458 Part 6 (cl 4.2) is stricter: preferred size 150–300 mm, no stone larger than two-thirds the depth of the unit or 300 mm, and the smallest dimension at least twice the mesh opening. Fresh, hard and clean — never weathered rock.
• Place the best face stones first, pack tightly, and overfill slightly to allow for settlement before the lid is closed.
• Check the porosity by weighing (IS 14458-6 cl 7.4): a filled 1.5 × 1 × 1 m box at 35% voids should weigh about 2.5 t. Much lighter means too many voids.

More in our gabion stone guide.

Drainage, filter and backfill

• No drainage system is needed behind a gabion wall — it drains itself (IRC:SP:116 cl 6.1).
• A filter is needed: a non-woven geotextile between the gabions and the soil — Type III behind a wall, Type I in river and marine works where water flows through (cl 6.1, 4.3). In heavy rainfall, add coarse drainage material at the base of the fill and a catch-water drain.
• Selected backfill out to the 45° + φ/2 line from the toe, as IRC:78 sets (cl 6.7).
• IS 14458-6: where the backfill is 0.5 m wide or more, use an inverted filter; where it is narrower, free-draining material from small boulders to coarse sand. Compact in 200–300 mm layers and seal the top 500 mm with natural or clayey soil to keep surface water out.

Building it to the code

• Foundation: excavate, replace loose pockets with granular fill, clear standing water and compact to 95% of modified Proctor (IS 14458-6 cl 7.1).
• Box size: in the hills the common module is 2 × 1 × 1 m with the 2 m side parallel to the slope.
• Lacing: one continuous wire, alternating single and double loops at every mesh opening, secured at each corner — no individual ties. IS 16014 fastener rings applied with a tool are an accepted alternative (cl 7.2).
• Joints: stagger the vertical joints between courses so no weak vertical plane runs through the wall.
• Backfill with the wall, course by course — never after it is finished.

Step by step, with the stages in order: how to build a gabion wall.

Specifying the gabions

Write the boxes to IS 16014:2024: mesh type (10×12 or 8×10), coating (heavily galvanized, or PVC coated over galvanized), mesh, selvedge and lacing wire diameters, unit sizes and diaphragms every metre. Some older documents still cite the 2012 edition; the 2024 edition is current. See the gabion box specification for the full wire schedule.

If your BOQ calls for 4 mm wire crates to MoRTH clause 2503.3, read this first — that clause has to be aligned with IS 16014 before it can be supplied.

Questions