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Borehole Investigation

Borehole investigation is done by the service provider who is an expert on it. After finalizing the borehole layout, an investigation of the condition of the ground is done. As discussed in the article " How to select number of boreholes ", the number of boreholes are drilled to get the recommendation for foundations. Commonly, the standard penetration method (SPT) is used to find the condition of the ground. It is a method that provides the stiffness of the soil based on the penetration when a constant pressure applied. Based on the SPT values and observations made on the samples taken during the coring, allowable bearing capacity for foundations is provided after doing necessary calculation by taking into account the types of soil layers present and the overburden where the foundations are rested. For deep foundations, drilling the ground up to the fresh rock and coring in the fresh rock are done to check the soil and rock profiles. The depth of the coring in the...
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Testing before Construction

Testing in construction is done in different stages. Preconstruction, during construction and post-construction tests, is done to control the quality and to assure the quality of the construction work. For example, preconstruction tests can be identified as the testing of materials, testing of ground conditions for foundation, etc. Testing of the during construction is a must to assure the quality of construction work. For example, testing of concrete cubs is done to check whether the concrete has achieved the strength. Further, there is a post-construction check such as a test on completion. For example, check the lift after installation for its loads capacity is done as post cost construction testing. Testing in construction is discussed under three main categories in this article. Firstly, it is required to test the condition of the ground for evaluating the types of foundation based on the geotechnical condition of the ground. Secondly, post-construction testing and testing...
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How to Select Number of Boreholes

Borehole layout is decided based on the area to be covered and the type of the foundation be constructed. In addition, the importance of the structure is also considered in selecting the number of boreholes to be done. For example, when a high rise building is designed, knowing the conditions of the ground preciously is very very important to the designer. Thus, the planning of the borehole layouts is done. Small Projects In low rise buildings, we may plan the number boreholes based on the condition of the ground and cover the whole footprint of the building. For small buildings such as two 2-4 story, constructed in a weak ground, one might select one borehole considering the spread of the structure. Large Projects Buildings such as high rise buildings, it is required to plan the borehole layout properly and accurately to cover the area covered by the structure. The number of boreholes is depended on the area of the structure and based on the condition of the ground pr...
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