Soil Investigation - i-astm.com

1 Method Statement FOR. soil Investigation PREPARED BY JUNE 2010. Infratech ASTM CO., LTD. TABLE OF CONTENTS. Chapter Title Page Table of Contents ..1. List of 2. List of 2. List of 2. INTRODUCTION AND BACK GROUND OF THE PROJECT .. 3. SCOPE OF WORK .. 3. FIELD Investigation AND BOUNDARY SURVEY .. 3. General .. 3. Boring and Sampling . 4. Groundwater ..4. Field permeability Test ..4. soil Resistivity Test ..5. Test Pit .5. Down Hole Seismic Test .5. Dutch Cone Penetration Test ..5. Site Boundary Survey LABORATORY TEST ..6. Unconfined Compression test . 6. Atterberg Limits.

2 6. Particle Size Analysis .. 6. Unit Weight and Water Content Determination . 7. Oedometer test ..7. Compaction Test and CBR Test 7. Water Analysis .7. REPORT ..8. Figures Appendix Tables 1. Infratech ASTM CO., LTD. List of Appendix Appendix A Sample of soil Boring Log data sheet Appendix B Sample of Summary of general laboratory test data sheet Appendix C Sample of Pile calculation data sheet Appendix D Sample of Shallow Foundation Bearing Capacity Analysis Appendix E Sample of Prediction of long term settlement calculation List of Table Table 1 Sample of Unconfined Compression Test data sheet Table 2 Sample of Atterberg Limit Test data sheet Table 3 Sample of Sieve Analysis Test data sheet Table 4 Sample of Unit Weight data sheet Table 5 Sample of Water content Test

3 Data sheet Table 6 Sample of Consolidation Test data sheet Table 7 Sample of Field Permeability test data sheet Table 8 Sample of soil resistivity test data sheet Table 9 Sample of down hole seismic test data sheet Table 10 Sample of Dutch cone penetration test data sheet Table 11 Sample of compaction and CBR test data sheet Table 12 Sample water analysis test data sheet 2. Infratech ASTM CO., LTD. INTRODUCTION AND BACK GROUND OF THE PROJECT. This method statement will summarizes the procedure on the subsoil Investigation works and boundary survey to be conducted by Infratech ASTM Company Limited for the construction.

4 SCOPE OF WORK. The scope of work for the geotechnical consultancy services of the project are summarized as follows: soil boring, field testing and carrying out sufficient in-situ testing and sampling. Laboratory testing of obtained samples to determine the properties of the subsoil. Determination of geotechnical parameters required for foundation analyses. Carrying out engineering analyses for foundation design. FIELD Investigation . General The Investigation program included drilling boreholes and collecting soil samples at desired intervals for subsequent observation and laboratory testing.

5 The Investigation program will consist of soil boring and sampling at desired intervals for subsequent observation and laboratory testing to determine the capacity of pile foundation economically and safely. Boring and Sampling The boreholes will be made by the rotary drilling machine. Undisturbed sample will be taken in the soft and medium clay at , , and m depths and at m intervals thereafter using a thin-walled sampler with dimensions conforming to standard sampling tubes specification (ASTM D 1587). Disturbed samples for very stiff clay to hard clay layer will be collected during Standard Penetration Testing at m intervals.

6 (ASTM D 1586). The borings shall be drilled vertically through soil approximately 30 meters deep or stop in firm layer when SPT N-value is greater than 50 blows/ft. Accuracy of bore hole position will be not more than m. in horizontal direction and in vertical direction. Standard Penetration Testing Standard Penetration Tests (SPT) will be carried out to provide an indication of the density and/or consistency of the ground and to obtain disturbed samples for visual inspection and laboratory testing and classification. The results of the tests will be given on the boring logs in Appendix A and will 3.

7 Infratech ASTM CO., LTD. be expressed as an N value. The N value is defined as the blow-count for 12 (300mm) penetration recorded after the seating drive of 15 cm. In the case of premature refusal conditions, the number of blows for a recorded penetration (including the seating drive) is noted. In SPT testing, the rope-and-pulley (R-P) method will be used. This consisted of a hollow cylindrical mass sliding over a steel rod. It is operated by lifting the mass with a rope over a cat head. At the instant the mass reached the required height (760 mm), the mass will be released manually driving the split spoon into the soil .

8 Disturbed samples collected from the split-spoon sampler during Standard Penetration Test will be visually inspected before storing in a polyethylene bag for laboratory testing. A. graphical representation of the changes in the soil strata, water levels and SPT N values will be given in the boring logs. Groundwater Measurement Groundwater is one element that affects in the stability and foundation analyses. The groundwater level was measured 24 hours after completion of the borehole. However, the low permeability of the soil will mean that the water level in the borehole is controlled more by drilling fluid rather than by the ground water itself.

9 Significant fluctuations in the location of ground water table should be anticipated throughout the year, depending upon the amount of precipitation, evaporation and surface runoff. Field Permeability Test Permeability test of soil in the field will be performed at the depth of 2,4,6,8 and 10 m. by constant head method. soil Resistity Test (Provisional). The purpose of this test is to investigate for the need of cathode protection and to have data necessary for the design of an adequate grounding system. The soil Resistivity measurement shall be carried out in accordance with IEEE 81 standard.

10 Guide for Measuring Earth Resistivity, Ground Impedance and Earth Surface Potentials of a Ground System . The measurement shall be done using Wenner Four Points Method with equal test rods spacing. The area to be measured shall be the power block area of power plant, terminal substation and switchyard. Before carrying out the measurement, the rectangular grid shall be drawn for the testing areas with mesh spacing at approximately 5-10 m. The measurement shall be made at every intersection point of grid lines. The measurement at any point shall be done for two directions, one from the measured point along the direction from east to west and another shall be from the measured point along the direction from north to south.