What is purpose of site exploration?
The purpose of site exploration is to collect complete details of the site to enable the designer to take following decisions, (i) To fix the value of the safe bearing capacity of soil. (ii) To select an economical yet safe type of foundation.
What are the methods of site exploration?
The various methods of site exploration may be grouped as follows:
- Open excavations. Trial pits are tho cheapest method of exploration in shallow deposits, since these can be used in all types of soils.
- Borings.
- Sub-surface soundings.
- Geo-physical methods.
Why is site exploration important for construction?
Along with saving money and reducing potential damages, performing a site investigation helps to identify safety requirements for the project and can assist in determining which materials should be used during the construction process.
What are the disadvantages of wash boring?
Some of the disadvantages of wash boring are: The method is slow in the stiffer and coarse-grained soils and is not efficient in materials such as hard or cemented soils, rock, and soils that contain boulders.
What are the three important aspects of a 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.
What are the main objectives of a site investigation?
The objective of a site investigation is to gather the information needed to carry out the risk assessment, in order to be in a position to assess the presence and significance of contamination of land.
What does a site investigation include?
A site investigation involves the collation of desk study information; appraisal of the data; assessment of the ground conditions; and the provision of an interpretative report.
What is the purpose of ground investigation?
Geotechnical investigations obtain information on the physical properties of soil, rock and/or shallow groundwater around a site to assess suitability of material for construction and to allow accurate design of earthworks and foundations.
What causes ground movement?
Ground movements can arise from two major sources: movements due to ground instability, caused, for example, by slope instability, geological voids, or subsidence due to the collapse of old mineworks; and movements due to a changing stress-state, leading to volume changes within the soil.
How long does a ground investigation take?
Usually, they take three to four weeks to allow time for laboratory testing and mobilisation of drilling crews or excavators. To accelerate timescales, we can supervise multiple investigation crews at a site.
How much does a ground investigation cost?
The cost of a soil investigation depends on the size of the project and whether there are planning conditions to be satisfied. A desktop study of a site could cost around £600 plus VAT. A basic soil investigation costs around £1,500 plus VAT, scaling up from there depending on the size and complexity of the project.
What is a ground model?
The ground model is a live, up-to-date state of knowledge of site conditions relevant to the development. It contains all available site characterisation data and analysis products. Desk studies using all available data for early-stage investigations and initial site selection. Geomorphological mapping.
What are ground investigation techniques?
Ground Investigations
- Trial Pits.
- Window Sample and Windowless Sample Boreholes.
- Cable Percussion Boreholes.
- Rotary Boreholes.
- Gas Monitoring Services & Reports.
- Geological Mapping.
- Ground Water Monitoring.
- Surface Water Monitoring.
What are the ground improvement techniques?
The specific techniques that can be utilised for ground improvement are:
- preloading or surcharging with sand, either with or without vertical drains;
- various compaction techniques including vibratory methods,
- soil removal and replacement, stone columns, and geotextile encased sand columns; and.
What is a direct ground investigation?
Ground investigations are a means of determining the condition of the ground, ideally before beginning construction works.
Why do we do boreholes?
A borehole may be constructed for many different purposes, including the extraction of water, other liquids (such as petroleum) or gases (such as natural gas), as part of a geotechnical investigation, environmental site assessment, mineral exploration, temperature measurement, as a pilot hole for installing piers or …
How long do boreholes last?
As a general rule of thumb, a properly installed and sized borehole should last 8-10 years. If you have only just installed a borehole, you’re likely to see years of service from your current equipment. This is extendable with good care and frequent maintenance.
Which is better well or borehole?
So back to the difference between a well and a borehole. Wells originally were sunk by hand using bricks or rocks as the well liner. The main advantage of a borehole is that it is possible to penetrate the aquifer to a greater depth ensuring a reliable supply in times of drought or high usage.
What are the disadvantages of boreholes?
Disadvantages of boreholes and borehole water A disadvantage to using borehole water is that it can’t be used for every form of consumption, without purification treatment, such as cooking, watering edible vegetables and drinking. This cannot be done straight from the source due to the possibility of contaminants.
Why are boreholes bad?
Disadvantages of boreholes and bore water Groundwater is found far below the surface, but it can still be affected by contaminants. When there is a high level of contamination in any location in the area near the bore water, it is likely that the water will be affected.