What are the contents of Investigation report?

The Requirements of an Investigative Report It should be succinct and focus on the mission or goal of the investigation. The investigator’s primary purpose is to locate information and, thus, evidence on a precise matter, to recover significant documents, or recover certain file types and any date and timestamps.

What makes a good investigation report?

The investigation report should aim to educate and persuade. The report should clearly explain how the conclusions have been reached. Keep the report as short and as clear as possible and avoid any hint of bias.

What is a site investigation report?

Site Investigation is the process of collecting information, assessment of the data and reporting potential hazards beneath a site which are unknown. Detailed Site Investigation. Supplementary investigation and construction control.

What are the stages of site investigation?

The sequence of a site investigation is as follows:

Desk Study.
Site Reconnaissance.
Preliminary report or feasibility study.
Preliminary Ground Investigation – Planning of main GI.
Preliminary report.
Main Ground Investigation.
Laboratory testing.
Final report.

What is the first stage of site investigation?

Site reconnaissance is the first stage of site investigation. In this stage, visual inspection of the site is done and information about topographical and geological features of the site are collected.

What are the elements of site investigation?

Site investigations should include:

Susceptibility to groundwater levels and flow.
Underlying geology, and ground and hydro-geological properties.
Identification of physical hazards.
Identification of methane and other gases.
Determining an appropriate design.
Providing soil parameters for design and construction.

Why is a site investigation important?

Ground investigations are important for determine if the ground contains contamination which can harm humans or the environment, and if the soils at the site are strong enough to support the proposed new buildings. Contamination can also get into the water environment, harming wildlife and plants.

What is detailed investigation?

a searching inquiry for ascertaining facts; detailed or careful examination.

What are ground investigations?

Ground investigations are a means of determining the condition of the ground, ideally before beginning construction works. Ground investigations help determine: Water table level and water flow. The nature of faults, fissures and voids in the underground. Ground layer thicknesses and the mechanical properties of soil

What is the purpose of a geotechnical site investigation?

Geotechnical investigations are performed by geotechnical engineers or engineering geologists to obtain information on the physical properties of soil earthworks and foundations for proposed structures and for repair of distress to earthworks and structures caused by subsurface conditions.

What are the benefits of geotechnical investigation?

What are the benefits of a geotechnical investigation? Geotechnical investigation allows for a more informed foundation and structure design, adding to the cost effectiveness of the project. The larger the project, the bigger the investigation would be, and therefore, the greater the overall cost savings.

What are the methods of soil investigation?

Direct methods -Test pits Test pits or trenches are an open type or accessible soil exploratory system. Soils can be examined in their natural condition. Sampling procedures can collect the underlying soils samples and used for finding strength and other engineering properties by relevant laboratory tests.

What are the types of soil tests?

Types of Soil Tests for Building Construction

Moisture content test.
Atterberg limits tests.
Specific gravity of soil.
Dry density of soil.
Compaction test (Proctor’s test)

What are the objectives of soil investigation?

For soil two main purposes are identified to carry out soil surveys. One is to classify the soil as a result of soil forming processes (generalSurvey) and the other one is to investigate soil for a specific reason (specificSurvey) like a possible contamination as a result of contaminating activities.

How many steps are involved in a soil investigation?

6. How many steps are involved in a soil investigation? Explanation: The first step is reconnaissance (visual inspection, maps, photos, etc.). The next step is exploration (geophysical, electrical, pits, etc.).

What is the scope of soil investigation?

(i) To determine the basic properties of soil which affect the design and safety of structure i.e., compressibility, strength and hydrological conditions. (ii) To determine the extent and properties of the material to be used for construction. (iii) To determine the condition of groundwater.

Why is soil investigation undertaken?

Soil investigation must be undertaken to determine the bearing capacity of the soil, its settlement rate and the position of the water table. One of the easiest methods is to dig trial pits and visual inspections carried out then samples with minimum disturbance are collected for subsequent laboratory testing.

What are the methods of boring?

The different types of boring methods are:

Displacement boring.
Wash boring.
Auger boring.
Rotary drilling.
Percussion drilling.
Continuous sampling.

How many types of boring are there?

4 Types of Boring Techniques Used During Construction. Boring involves the drilling of holes into the ground for many different purposes. In the construction industry, boring is a technique used to explore the underground surface and to determine if it is capable of holding up a building.

Which method is used for boring a well?

Hydraulic Rotary Boring Method: ADVERTISEMENTS: This method is generally called rotary boring method. This method can be successfully used for rock as well as unconsolidated formation. The method is therefore used for water well as well as oil well drilling.

In which type of soil auger boring is used?

Auger boring is used in __________ type of soil. Explanation: Augers are used in cohesive and other soft soils above the water table. Explanation: Cylindrical augers and shell with cutting edge on teeth at the lower end can be used for making deep boring.

What is the purpose of auger boring?

Auger is a device which is used for boring manually. For advancing the bore holes for ground water to a depth of about 10 m hand augers or manual augers are commonly used. For deeper depths of about 50 mm to 300 mm other auger such as helical auger or post auger etc

How do you collect disturbed soil samples?

You can use drill rigs to collect disturbed samples from great depths. Collection tools such as split-spoon samplers, Shelby tubes and macrocore push samplers are used in conjunction with the drill rig or a direct-push rig to collect the sample after the rig reaches the desired depth

Which instrument is used in hand augers?

Stiff clays, hard materials and gravels are difficult or impossible to drill through and to remove (unless augering is combined with percussion). The hand auger consists of extendable steel rods, rotated by a handle. A number of different steel augers (drill bits) can be attached at the bottom end of the drill rods

How deep can an auger drill?

about 3 ft.

Which is the commonly used geophysical method for site exploration?

Surface geophysical methods include magnetic, gravity, seismic refraction, seismic reflection, electrical resistivity, natural potential and,ground penetrating radar. The method(s) selected will depend on the type of information needed, the nature of the subsurface materials and cultural interferences.

What are the types of geophysical method of soil exploration?

What are geophysical soil exploration methods? Two particular geophysical methods – seismic refraction and electrical resistivity – are most commonly used. In the former, resistance to flow of a seismic wave through soil is measured; in the latter, resistance of soil to movement of an electrical current is determined.

What is seismic refraction method?

The seismic refraction method utilizes the refraction of seismic waves by rock or soil layers to characterize the subsurface geologic conditions and geologic structure. The waves are refracted when they cross the boundary between different types (or conditions) of soil or rock.