project class

Engineering Management Department

Riyadh, Saudi Arabia, 2019-2020

CLASS PROJECT EM 306: Soil Mechanics and Foundations

2nd semester (192) - Year 2019-2020.

1 | P a g e Soil Mechanics and Foundations

Prince Sultan University

College of engineering

Engineering Management Department.

Academic Year 2019-2020 – Semester (192)

EM 306: Soil Mechanics and Foundations

Class Project 2019/2020 Soil Testing Technical Report

Introduction

The geotechnical report is a tool used to communicate the site conditions and design and construction recommendations to the site design, building design, and construction personnel. Site investigations for building design projects have the purpose of providing specific information on subsurface soil, rock, and water conditions. Interpretation of the site investigation information, by a geotechnical engineer, results in design and construction recommendations that should be presented in a project geotechnical report.

Geotechnical investigation reports present site-specific data and have three major components:

1. Background Information: The initial sections of the report summarize the geotechnical engineer's understanding of the facility for which the report is being prepared and the purposes of the geotechnical investigation. This section would include information on loads, deformations and additional performance requirements. This section also presents a general description of site conditions, geology and geologic features, drainage, ground cover and accessibility, and any peculiarities of the site that may affect the design.

2. Work Scope: The second part of the investigation report documents the scope of the investigation program and the specific procedures used to perform this work. These sections will identify the types of investigation methods used; the number, location and depths of borings, exploration pits and in situ tests; the types and frequency of samples obtained; the dates when the field investigation was performed; the subcontractors used to perform the work; the types and number of laboratory tests performed; the testing standards used; and any variations from conventional procedures.

3. Data Presentation: This portion of the report, generally contained in appendices, presents the data obtained from the field investigation and laboratory testing program, and typically includes final logs of all borings, exploration pits, and piezometer or well installations, water level readings, data plots from each in-situ test hole, summary tables and individual data sheets for all laboratory tests performed, rock core photographs, geologic mapping data sheets and summary plots, subsurface profiles developed from the field and laboratory test data, as well as statistical summaries. Often, the investigation report will also include copies of existing information such as boring logs or laboratory test data from previous investigations at the project site. The intent of a geotechnical investigation report should be to document the investigation performed and present the data obtained. The report should include a summary of the subsurface and lab data.

4. Conclusion and recommendations: this is the most important part conclusions should be drawn based on the results of both in-situ and laboratory soil testing. These conclusions are used to come out with the foundation design and construction recommendations.

2 | P a g e Soil Mechanics and Foundations

Prince Sultan University

College of engineering

Engineering Management Department.

Academic Year 2019-2020 – Semester (192)

EM 306: Soil Mechanics and Foundations

The Project Statement:

The residential villa shown in the Figure below, will be constructed in Jeddah city (KSA), in front of

the sea beach. This building consists of only two floors. According to the architectural design, the

ground floor will be used as a reception area, and the second floor will be used as bedrooms and living

space.

Figure (1): Architectural Design fo the residential villa

The structural system is shown in drawings below, and the columns and beams distribution on both

first and second slabs of the two floors are presented. As shown in Figures (2 and 3), The structural

system mainly depends on the Solid Slab system, and the load will be transferred from slabs to beams

and then to columns.

Based on the initial calculations performed by the structural consultant, it was found that the load

transferred from each of the columns A,D,F, and K (Corner columns) is 1000 kN, and for the interior

columns B,C,G, and H each of them transfer 2500 kN to the foundations, as shown in Figure 4.

3 | P a g e Soil Mechanics and Foundations

Prince Sultan University

College of engineering

Engineering Management Department.

Academic Year 2019-2020 – Semester (192)

EM 306: Soil Mechanics and Foundations

Figure (2): Structural system of The First Floor

Figure (3): Structural system of The Second Floor.

4 | P a g e Soil Mechanics and Foundations

Prince Sultan University

College of engineering

Engineering Management Department.

Academic Year 2019-2020 – Semester (192)

EM 306: Soil Mechanics and Foundations

Figure (4): Cross Section.

Geotechnical consultant have performed site investigation works at the construction site, and the

following section presents the results of field and laboratory tests conducted using both disturbance

and un-disturbance soil samples

1. The Soil profile shown in Figure (5) organizes the results obtained for soil samples taken

along the borehole depth. The profile shows the results of the in-situ standard penetration test

SPT and atterberg limit test for soil samples at each 1m depth.

2. Sieve analysis test results for three disturbance samples obtained from boreholes (Layer 1

and 2) at depths of 1.0, 3.0, and 5.0 m below the ground surface are shown in Figure (6). Also,

results of the Sieve analysis test for another three disturbance samples obtained from

boreholes at depths 7.0 and 8.50 m below ground surface (Layer3 and 4) are shown in Figure

(7).

3. Permeability test has performed for a soil sample taken from layer (1), the sample length and

diameter were 15.80 cm and 10.16 cm, respectively. Also cross-section area of the test

equipment tube was 1.83 cm2. After 5.0 days, the water head was changed from 120 cm to

110 cm.

4. Consolidation Test has also been performed for un-distrubance sample taken from layer (1),

and mv was obtained with 4.2 * 10-4 m2/kN. Besides, the unconfined test that shown the

unconfined strength of this soil sample equals 150 kN\m2.

5 | P a g e Soil Mechanics and Foundations

Prince Sultan University

College of engineering

Engineering Management Department.

Academic Year 2019-2020 – Semester (192)

EM 306: Soil Mechanics and Foundations

Figure (5): Borehole Profile with atterberg limit and SPT test results

Figure (6): Sieve analysis test results of three samples extracted at depths 1.0, 3.0, and 5.0 m

below ground surface.

6 | P a g e Soil Mechanics and Foundations

Prince Sultan University

College of engineering

Engineering Management Department.

Academic Year 2019-2020 – Semester (192)

EM 306: Soil Mechanics and Foundations

Figure (7): Sieve analysis test results of three samples extracted at depths 1.0, 3.0, and 5.0 m

below ground surface.

Based upon, if you are the geotechnical consultant, it is required to:

1. Use the given data of field and laboratory tests to classify and describe the four soil layers and complete the soil profile (Layer 1,2,3 and 4).

2. Correct N-SPT values and calculate bearing capacity for the first and second soil layers only.

3. Choose the suitable foundation level. 4. Based on the given columns loads, Choose the suitable foundation system to support

this column load. Consider the factor of safety of 3.0.

5. Calculate the predicted immediate settlement under this footing (1) and (2); if the soil passion’s ratio is 0.30.

6. Recalculate the settlement after 5 Years. 7. If the allowable settlement is 15 cm, and the allowable differential settlement is 1:300.

Check the safety of this building.

8. Write down a geotechnical report summarizing all your performed works and give your fundamental recommendations for foundation design and construction.

Deadline: Monday, 20th April 2020