Example SITE INVESTIGATION REPORT

SITE INVESTIGATION REPORT THEORY Site Investigation is conducted by geotechnical engineer to obtain information on the physicals properties of soil and rock around a site to design earthworks and structures caused by subsurface conditions. Soil samples are often categorized as being either “disturbed” or “undisturbed;” however, “undisturbed” samples are not truly undisturbed. A disturbed sample is one in which the structure of the soil has been changed sufficiently that tests of structural properties of the soil will not be representative of in-situ conditions, and only properties of the soil grains (e.g., grain size distribution, Atterberg limits, and possibly the water content) can be accurately determined. An undisturbed sample is one where the condition of the soil in the sample is close enough to the conditions of the soil in-situ to allow tests of structural properties of the soil to be used to approximate the properties of the soil in-situ.

OBJECTIVE A) To introduce the techniques on taken disturbed and undisturbed soil. B) To determine the physical properties of the soil through the phase relationship. C) To determine or analyze the ‘visual’ type of land / soil that available / have been taken.

EQUIPMENT

Excavating equipment

Equipment manufacture

Sampling tool

Hoe

WORK PROCEDURE A. Work procedure on site (The area selected determine by the lecturer in charged. The site location was not far away from the soil mechanic laboratory in polytechnic and the work was carried out there.) 1) Dig the soil to a depth of 1m by using an auger

2) Connect the sampling tube to the equipment manufacturers.

3) Lower the sampling device to the bottom of the hole and then push it into the ground

4) Take three samples from the hole which was undisturbed soil, and get well over 5kg less disturbed soil as a sampling. Keep the disturbed soil as a samples in a bag and bring it back to the laboratory.

B) Work Procedure on laboratory 1) Greased the split mould and place mold in conceivable. Remove the soil sample of un disturbed from the sampling tube into a split mold and cut both ends of soil with the wire saws. 2) Measure the diameter and the length of the soil sample equal to 0.5 mm. Weight the soil sample and find the bulk density. 3) Work procedure to find the moisture content a. Weight on empty moisture content can (clean and dry) to get the accurate readings. Take some of the soil samples 30gram and put in the can. Weight the can with a wet soil. Dried them into the oven within 24 hours. After 24 hours, weight the can and the content once again. b. Please take three samples for this moisture content test Research the soil sample by visualize. a) b) c) d)

Take a little of disturbed soil samples and look at the colour of the soil. Feel the soil with a finger, find out whether it is grain, smooth or vice versa. Grasp of the soil. will it be hand held, shaped-torm or it is friable. In your understanding, what types of soil was it? (soil type will be obtained after the technical and outrageous experiments on previous time).

DATA

Sampling for undisturbed soil A. Bulk density determination Test number Length of soil sampling(mm) Diameter (mm) Volume , V(m3) Mass of soil sampling, W(kg) Bulk density yb, W/V kN/m3

1 75

2 80

3 77

38.64 8.795×10-5 0.1756

38.24 9.188×10-5 0.1794

38.66 8.637×10-5 0.173

19.587

19.154

19.650

1 1 182.2g

2 2 186.2g

3 3 179.6g

6.6

6.8

6.6

B. Moisture content determination Test number Tin number Mass of can + wet soil(w1) Mass of can + dry soil(w2) Mass of empty can(w3) Mass of dry soil(w2w3) Mass of water(w1w2) Moisture content, m=(w1-w2)/(w2-w3) Average of moisture content,%

C. ‘Visual’ determination Colour Grasp with the hands Feel with the fingers Types of soil(please give your comment by

research)

CONCLUSION In this report, we know that site investigation is very important. This is because after we do site investigation, we know the soil condition, physical properties, characteristic and the suitability for constructing a building as the soil is the foundation of a building. Besides that, we also learnt how to use various equipment and apparatus to carry out our experiment in a smooth way.