There are many types of Geotechnical Drilling performed around the world, it is considered to be similar to the construction of a structure such as a building or an oil rig. It readily used in the construction process and also as part of the early pre-construction process conducted on site before a structure is built. This procedure is commonly performed by an organization which specializes in geotechnical drilling services, with a geotechnical engineer supervising the operation who remains present to making sure that the drilling is performed according to project specifications. These firms could also perform other services, which would depend on size and location.
One common reason for geotechnical drilling is site investigation. Site investigation determines whether a particular location will be suitable for the operation to be performed. This would include drilling to remove rock and soil samples, along with preliminary site investigation trying to evaluate if the soil is stable and other possible concerns. This is also commonly referred to as Foundation Engineering, which falls into a couple of categories. A foundation is the lowest and supporting layer of a structure and is generally divided into two categories: shallow foundations and deep foundations.
An important stage in the drilling and foundation investigation can be critical when you have large structures. Unsafe soil or rock conditions could lead to structural collapse, or even create a dangerous situation during a earthquake or flood. The laws in most states usually require that an investigation be performed before permits are issued to build, and make sure that ongoing safety monitoring occurs to detect any changes that may be developing which could pose a threat to the operation.
One common method of determining structural integrity is called Cross Hole Sonic Logging or (CSL) for short, this is a very useful method in testing drilled shafts and other concrete piles. Testing has proved that this method is considered more accurate than sonic echo testing in the determination of structural soundness when it comes to concrete within the drilled shaft inside of the rebar cage. This state-of-the-art testing method uses the theory of sonic wave propagation to check the material quality and integrity of newly placed drilled shafts, seal footings and slurry or diaphragm walls, and other structures. It is gaining popularity across the industry and provides the following advantages:
- Cost-effective and fast
- Detects the extent and location of damage
- Easily performed with completely portable equipment
- Performed at practically any depth with no loss of accuracy
- Can be used to check the efficiency of repairs
- Provides an increased level of confidence in foundations
When Geotechnical engineering is being considered be sure that the company being considered offers the services you need to perform the work needed, whether it be cross hole sonic logging or foundation engineering.