SOFOCO to carry out soil investigation work carried out at the Patimban Access Toll Road Construction Project Package 1 location, Sta. This soil investigation work is intended to determine the condition and parameters of the soil for foundation planning that will be used to support the building structure in the area. The soil investigation work on the Patimban Access Toll Road Construction Project Package 1 was carried out based on Work Order No.
The soil investigation work report, which covers the scope of field work, laboratory work, and analysis of the results of soil investigation work for the Patimban Access Toll Road Construction Package 1, is divided into three books. The field data report contains Boring Profile data, CPT/Sondir Graphs and Readings, and field work documentation. The laboratory data report contains a summary of the results of laboratory work with individual test results, such as soil physical and engineering tests.
The soil investigation work carried out was in the Section 3 area, namely Pasir Bungur Interchange to Tambak Dahan Interchange. However, this soil investigation work was only carried out in the Pasir Bungur Interchange area, namely Pasir Bungur Village to Tanjung Rasa Village, and did not reach the Tambak Dahan Interchange area.
Soil Investigation Layout
Soil Investigation Work
List of Soil Investigation Work
SPT WORK POINT LIST
DESCRIPTION
POINTSTATIONELEVATION
CPT WORK POINT LIST
ELEVATION
SITE CONDITIONS
- Regional Geology
- Stratigraphy
The Patimban Access Toll Road construction area is located near the Java Sea, which has a width of approximately 40 km. Most of it is covered by alluvial deposits transported by rivers that empty into the Java Sea, such as the Citarum River, Cimanuk River, Ciasem River, Cipunagara River, Cikeruh River, and Cisanggarung River.
Stratum Symbol Formation Remarks 1 Qav Tufan Sandstone
SUBSOIL CONDITIONS
- Subsoil Layers
- Cross Section Profile
- Subsoil Properties
- Groundwater Elevation
Based on field observations during the soil investigation work, the site for the Patimban Access Toll Road Construction Package 1 is lowland to wavy with elevations ranging from 4 m to 17 m above sea level. From the results of soil investigation work using the wash boring method and Standard Penetration Test (SPT) testing to a depth of 50 m conducted at 40 borehole points from CB-01 to CB-02, CB-05 to CB-07, and CB-16 to CB-50. Soil layer profiles were obtained that can be used as a basis for determining the stratification and consistency of the soil in the Patimban Access Toll Road Construction Package 1 area.
The soil properties shown in the table above are the test results of undisturbed samples taken at the time of drilling, taking undisturbed samples based on changes in soil characteristics and soft to stiff soil consistency. More detailed parameters of soil properties can be seen in the summary table of laboratory test results in chapter 5 or in Book 3 of 3-Laboratory Data Report Patimban Access Toll Road Construction Project Package 1. From the evaluation of the graphical data above, the average depth of the groundwater table in the borehole is at a depth of 1.2m below the ground surface with an average groundwater table elevation of +8.815.
There are some groundwater levels that have significant depths, which can be caused by disturbances during drilling. It should be noted that the groundwater level data presented was obtained from the initial and final observations of the drilling only, so to obtain the actual depth of the phreatic groundwater table, further observations must be made.
ANALYSIS AND RECOMMENDATION
- Field Data Analysis
To simplify the analysis of the results of CPT (Cone Penetration Test) and Boring work in the field, a composite graph of all work is presented, which can be used as a reference in determining soil consistency in the Patimban Access Toll Road Construction Package 1 area, as follows:.
DUTCH CONE PENETRATION TEST
Cone Resistance (Kg/Cm²)
SPT -N Values
Ground Surface
SUBANG - WEST JAVA
SOFT
- Foundation
- General Foundation
- Geological conditions: information about the geological conditions in the project area is very important to determine the condition of the underlying soil structure
- Soil parameters: information obtained from soil investigation results is very influential in determining the soil consistency value used in determining the bearing capacity of
- Design structural load: The total load or weight of the building plan to be supported by the foundation is used in determining the bearing capacity of the foundation and
- Foundation depth: the determination of depth is based on the bearing capacity parameters of the foundation and the planned structural load that the foundation is
- Pile Foundation
- Pile Group Effect Axial Loading
- Allowable Compression for Precast Pre-stressed Concrete Pile Control of driving stresses is particularly important when driving pre-stressed concrete
- SUMMARY OF LABORATORY TESTS
- Table Summary of Laboratory Test
- APPENDIX
- Output of Calculation
- Description of Sampling Procedures 1. Core Drilling
- Description of Field Tests 1. Cone Penetration Test (CPT)
- Description of Laboratory Tests
- Limitations
- References
From the composite analysis above, the consistency of the soil layers varies from very soft to very hard/very dense. Note: Thickness of the layer cannot be used as a reference because each borehole is different, see Cross Section Profile in chapter 3.2. Geological conditions: information about the geological conditions in the project area is very important to determine the condition of the underlying soil structure.
Soil parameters: information obtained from soil investigation results is very influential in determining the soil consistency value used in determining the bearing capacity of in determining the soil consistency value used in determining the bearing capacity of the foundation. Design structural load: The total load or weight of the building plan to be supported by the foundation is used in determining the bearing capacity of the foundation and by the foundation is used in determining the bearing capacity of the foundation and its lateral capacity. To determine the allowable bearing capacity of the pile in each borehole in the end bearing layer located in layers 1b, 2b, and 3b, the table below presents the results of the calculation of the allowable bearing capacity of the pile using 2 types of deep foundations, i.e., spun pile and bored pile.
From the pile allowable bearing capacity table above, it can be seen that the allowable bearing capacity value of the spun pile is greater than that of the bored pile, so it is recommended to use the spun pile foundation type. In the calculation of the allowable bearing capacity of the pile above, the bearing capacity that exceeds the compression allowable capacity value before reaching the end bearing layer will exert negative stress pressure and may result in cracking of the pile during driving. The number of blows for each 15-cm penetration of the sampler into the soil was read and recorded.
The conus penetration resistance is the soil resistance at the tip of the conus expressed in force per unit area. Frictional resistance is the shear resistance of the soil at the biconus casing, expressed in force per unit area. The purpose of sondir in general is to determine the strength of the soil at each depth and soil stratification by interpreting the data on conus penetration resistance and soil sticky resistance.
This test was conducted to determine the elevation of the "hard" layer and soil homogeneity in the lateral direction. The results of the cone penetration test of the cone penetration test are presented in the form of a sondir diagram that records the value of the cone resistance and casing friction. The undisturbed/UDS soil samples were further tested in the laboratory, this laboratory testing was done to find the physical and engineering parameters of the soil properties.
The results of the laboratory tests are tabulated in the laboratory summary table and individual test data such UU Triaxial and Consolidation are provided in Book 3 of 3 - Laboratory Data Report. There can be no assurance that the conclusions and recommendations of the soil investigation given in the report cover the full range of soil conditions in the project area. Samples taken and tested that are used for observation are only representative of the area under study.
The conclusions and recommendations provided are for reference only in determining the type and criteria of foundation suitable for the soil conditions in the test area and in distributing the building plan load to the soil so that it does not exceed the permissible bearing capacity of the test area.
Soil investigations were conducted based on current standard methods of work, with the usual level of care and skill. Conditions during construction may be different from those during soil investigations in areas where no testing was conducted, different conditions should be evaluated and designed according to existing soil conditions. ASTM D – 421 STANDARD PRATICE FOR DRY PREPARATION OF SOIL SAMPLES FOR PARTICLE-SIZE ANALYSIS & DETERMINATION OF SOIL CONSTANTS.
ASTM CODE DESCRIPTION