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Basic Steps in Excavation Jobs, Hazards And Precautions

Excavation work
Excavation Jobs
Excavation Jobs

Excavations and trenches are necessary part of the construction process in order to provide the infrastructure necessary for new projects.

The term “excavation” can be referred to as any man-made cut, cavity, trench, hole, or depression made in the earth’s surface, formed by earth removal while a Trench is a narrow excavation made below the surface of the ground.


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Steps in Excavation Jobs, Hazards And Precautions

Excavation is recognized as one of the most hazardous construction operations. A basic rule for excavation is “plan your dig, then dig your plan.” It is believed that if you encounter something unplanned for, then stop and re-plan.


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Steps in Excavation Jobs, Hazards And Precautions

If an excavation work is to be carried out, the following should be considered:

Drawings to show the depth, distances, location and surrounding environment.

Identification of existing underground services e.g. power cables, gas/water lines, sewer, etc.

Soil nature and specification

Surrounding features of building etc. that can be potentially affected by excavation.

Access and egress by workers

Method of excavation- mechanical or hand digging.

Identification of equipment to be used.

Excavated soil movement and disposal.

Type of exaction wall protection.

Competency of persons involved.


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Steps in Excavation Jobs, Hazards And Precautions

The soil is classified as:

Class A-very cohesive, e.g. clay, silty clay, clay loam.

Class B- Semi cohesive example; silt, silty loam, silt clay loam, etc.

Class C- Non cohesive example; sand, gravel, loamy sand, etc.

Stable rock-example; granite and sandstone.

The strength of soil is dependent on the type of soil, the amount of moisture in the soil and whether the soil has been previously disturbed.


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Steps in Excavation Jobs, Hazards And Precautions

The main hazards of excavation includes:

Equipment, plant, vehicles or people falling in.

Collapse of excavation wall (cave-ins)


Explosive Atmospheres

Buried services

Overhead power lines contact

Unprotected edges, incorrectly positioned access ladders, badly constructed vehicle ramps and materials stored or vehicles parked too close to the edge are main causes of equipment, plant or vehicles falling in.

Wrong judgement of soil type, additional weight due to equipment and vehicles parked too close, inadequate support of side walls, vibration of machinery and unstable walls caused by rain are the main causes of wall collapse or cave-ins.


  1. Workers should guide against unsafe attitudes.
  2. Underground services such as power cables, water/gas lines, sewer should be identified, isolated and protected. Buried utilities could be located and traced using detective devices.
  3. Excavators and power tools should not be used within 0.5meters of an indicated line of cable/pipe. Hand digging should be employed when nearing the assumed line of cable/pipe.
  4. Excavations more than 4feet (1.2 meters) should be tested for oxygen deficiency, highly combustible gas concentration such as methane and high levels of other hazardous substances such as hydrogen sulphide before an employee goes in. presence of water in the excavation is very hazardous, refer to our previous post on “WHY THIS EXCAVATION WAS CARRIED OUT THIS WAY” for this reason, groundwater must be removed before entry.


These and more can be used as precautions when embarking excavation jobs. Your personal contribution is welcomed.

4 thoughts on “Basic Steps in Excavation Jobs, Hazards And Precautions”

  1. I just finished reading this blog post on excavation jobs and the hazards involved, and I must say, it left me feeling quite alarmed. As someone who once worked on a construction site, I vividly recall the nerve-wracking experience of operating heavy machinery near deep trenches. The author’s emphasis on the importance of proper safety measures resonated with me, as I can personally attest to the fear that looms when confronted with the potential risks of collapsing soil and cave-ins.

  2. This article provides valuable insights into the hazards associated with excavation jobs. As someone who has worked in construction before, I can attest to the importance of following safety protocols when digging trenches or excavating sites. The author does a great job of highlighting the potential risks involved and emphasizing the need for proper training and equipment to prevent accidents.

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