Soil processing of the lending area
Soil processing of the lending area

The construction of subsurface structures often requires the creation of elements of the structure within or within the bulk of the backfill. The proper functioning of these elements is often seriously affected by the adverse behavioral characteristics of the backfill. Behavioral characteristics are related to material type, water content during compaction, grading and compaction effort.

While compaction effort can be easily controlled during compaction, it is difficult to control the type of material, the amount of water and the elevation of the material as it is being placed in the backfill; Control norms should be established prior to appointment.

1. Material Type

The backfill material should be a homogeneous material of consistent and desirable characteristics. The field engineer should ensure that only approved backfill material is used and that the material is uniform in nature and free of any heterogeneous material such as pockets of organic matter or soil.

Stratified material must be mixed before placing to obtain a uniform mixture. Excavated material used as backfill should be stored according to the class or type of material.

2. amount of water

While the water content can be adjusted to some extent after (but before compaction), it is generally more beneficial to adjust the water content to optimal compaction conditions before placing.

Adjustment of the amount of water may be accomplished by aeration (disking or turning) or by spraying in layers of 12 to 18 inches prior to placing or depositing the material. If material is stored, provisions should be made to maintain consistent moisture during wet or dry weather.

3. ensure upgrade

Some backfill materials consisting of crushed rock, gravel, or sand require limits on the maximum and minimum particle-size or gradation distribution. Where material meeting the gradation criteria cannot be detected, processing of the available material by sieve may be required to obtain the desired gradation.

Er. Mukesh Kumar

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Er. Mukesh Kumar is Editor in Chief and Co-Funder at Civil Engineering Website. Mukesh Kumar is a Bachelor in Civil Engineering From MIT. He has work experience in Highway Construction, Bridge Construction, Railway Steel Girder work, Under box culvert construction, Retaining wall construction. He was a lecturer in a Engineering college for more than 6 years.