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1. Introduction

Pile foundations are widely used to transfer structural loads to deeper and more competent soil strata where shallow foundations are not adequate or economical. The load-carrying capacity and settlement behaviour of piles are important considerations in foundation performance.

A Vertical Compression Load Test is carried out to evaluate the behaviour of a pile when subjected to axial compressive loading. The test provides field information on pile-soil interaction, pile displacement and the response of the pile under progressively increased loads.

This website blog presents the Initial Vertical Load Test carried out at site for the Perur 400 MLD Pumping Station – CP2 project. The test pile was identified as TP1-B and the test was conducted with reference to IS 2911 (Part 4): 2013.

2. Objective of the Test

• To determine the safe vertical load capacity of the pile.
• To measure pile displacement under compressive loading.
• To verify the design assumptions regarding vertical pile capacity.
• To study the load versus displacement behaviour of the pile.

3. Scope of the Work

1. Inspection of the test pile location and preparation of the pile head.
2. Preparation and installation of the reaction/loading system.
3. Installation of the hydraulic jack and pressure measurement system.
4. Installation of settlement measuring devices and reference arrangements.
5. Application of compressive load in incremental stages.
6. Recording settlement observations at specified time intervals.
7. Monitoring the pile during loading and unloading stages.
8. Compilation and technical documentation of field observations.

4. Test Arrangement

The pile head was chipped to remove overflowed concrete and dried bentonite slurry. The pile head was trimmed and finished to provide a smooth and level surface for uniform load transfer.

A 10.00 m × 10.00 m loading platform was constructed using structural steel sections. Three ISMB 600 sections were used as main longitudinal beams and ISMB 400 sections as cross/distribution girders. Concrete blocks were systematically stacked over the platform to provide the required kentledge.

A 40 mm thick steel plate was placed over the pile head. A 1000 MT capacity hydraulic jack was positioned centrally over the pile so that the pile, loading system and kentledge remained aligned to minimise eccentric loading.

Two datum bars were installed on either side of the pile at 2.0 m from the pile centre. Four dial gauges were mounted using magnetic bases to measure vertical displacement.

5. Test Procedure

5.1 Initial Preparation

Before loading, the hydraulic jack, reaction system, pressure gauge/load cell, dial gauges and reference beams were checked for alignment, stability and rigidity. The dial gauges were set to zero and measuring instruments were checked for calibration.

5.2 Loading Procedure

The compressive load was applied to the test pile in equal incremental stages. For the initial vertical load test described in the report, the load increment was generally not more than 20% of the safe load. Settlement observations were recorded at specified time intervals after each load increment. Further loading was applied only after completion of the required observations for the preceding stage.

5.3 Unloading / Rebound

After completion of the loading stage and required observations, the pile was unloaded in suitable decrements. Settlement recovery observations were taken during unloading, followed by final observations after complete unloading.

6. Test Details – JWIL Site

7. Equipment Used

8. Safety and Quality Considerations

• Ensure the loading platform and kentledge arrangement are stable before testing.
• Maintain proper alignment of the hydraulic jack and loading system.
• Keep personnel clear of the reaction/loading arrangement during loading.
• Verify the condition and calibration status of measuring instruments before testing.
• Protect dial gauges and datum/reference arrangements from disturbance.
• Record observations systematically at each specified load stage.

9. Summary

The Initial Vertical Load Test provides a controlled field method for studying the response of a pile under axial compressive loading. At the site, the test arrangement included a centrally aligned hydraulic jack, reaction/loading platform, kentledge and four dial gauges for displacement monitoring. Loading and unloading observations were recorded systematically as part of the field-testing process.

10. Conclusion

Vertical pile load testing is an important field investigation for assessing pile behavior under compressive loading. The Initial Vertical Load Test at the JWIL site was arranged to assess pile response, settlement behaviour and the relationship between applied load and displacement in accordance with the applicable testing requirements.

This website blog format intentionally excludes the project test results, load–displacement results and capacity assessment.

12. Reference

IS 2911 (Part 4): 2013 – Code of Practice for Design and Construction of Pile Foundations – Load Test on Piles.

1. Introduction

Pile foundations are designed to transfer structural loads safely to the supporting ground. In addition to vertical loads, piles may be subjected to horizontal or lateral forces due to wind, earth pressure, water forces and other operational effects. An Initial Lateral Load Test is carried out to study the response of a pile under controlled horizontal loading.

The Initial Lateral Load Test provides field information regarding lateral resistance, horizontal pile-head displacement and the response of the pile-soil system under progressively applied lateral loads. The test is carried out with reference to IS 2911 (Part 4): 2013.

2. Objective of the Test

• To determine the lateral load-carrying capacity of the test pile.
• To measure the horizontal displacement of the pile under lateral loading.
• To verify the design assumptions related to lateral pile resistance.
• To study the relationship between applied lateral load and lateral displacement.
• To observe pile behaviour during loading, unloading and rebound stages.

3. Scope of the Work

• Inspection and preparation of the test pile.
• Preparation and installation of the lateral reaction system.
• Installation and alignment of the hydraulic jack.
• Installation of the pressure gauge and displacement measuring instruments.
• Application of lateral load in controlled increments.
• Recording horizontal displacement at specified time intervals.
• Unloading the pile in suitable increments and recording rebound.
• Documentation of the field-testing arrangement and observations.

4. Test Arrangement

The lateral load test arrangement consists of the test pile, a suitable reaction system, a horizontally positioned hydraulic jack and a displacement measuring system. The reaction system is arranged to provide adequate resistance against the horizontal load applied to the test pile.

The hydraulic jack shall be positioned horizontally at the specified pile-head/cut-off level and aligned in the direction of loading. Suitable steel bearing plates and packing arrangements shall be provided to ensure proper contact, alignment, and uniform transfer of the applied lateral load to the test pile and reaction system.

An independent datum/reference system is provided for displacement measurement. The reference bars or beams are positioned at a sufficient distance from the test pile so that movement of the test pile does not affect the reference system.

5. Displacement Measurement

The displacement measurement system is one of the most important parts of the lateral load test. It is used to measure the horizontal movement of the test pile as the hydraulic jack applies load.

WHY? To determine how much the pile moves sideways under each applied lateral load and to understand the pile–soil response during the test.

6. Test Procedure

6.1 Initial Preparation

After completion of the test arrangement, the hydraulic jack, reaction system, pressure gauge, dial gauge and reference frame are checked for proper alignment, rigidity and stability. All displacement gauges are set to zero before the start of loading, and the load measuring system is verified for calibration.

6.2 Loading Procedure

The lateral load is applied to the pile through the hydraulic jack in equal increments. Each increment is generally taken as about 20% of the estimated safe lateral load. After applying each increment, the load is maintained until the rate of lateral displacement reduces to a negligible value or for the specified observation period.

6.3 Displacement Observations

During each loading stage, lateral displacement readings are recorded at regular time intervals such as 1, 5, 10, 15, 25, 35, 50 and 60 minutes, or as required by the project specification. The next load increment is applied only after the required observations for the previous stage have been completed.

6.4 Maximum Test Load

For an Initial Test, loading is continued up to 2.5 times the estimated safe lateral load or until the specified limiting condition is reached, whichever is applicable. The loading process is controlled throughout to maintain the stability and safety of the test arrangement.

6.5 Unloading and Rebound

After reaching the maximum test load and completing the required observations, the pile is unloaded in suitable decrements, generally corresponding to the loading increments. Each unloading stage is maintained for the specified period and recovery or elastic rebound is recorded. Final observations are taken after complete unloading.

7. Test Details

8. Equipment Used

9. Quality and Safety Considerations

• Check the stability and rigidity of the complete reaction system before loading.
• Ensure correct horizontal alignment of the hydraulic jack with the intended loading direction.
• Verify calibration and serviceability of pressure and displacement measuring instruments.
• Keep the reference frame independent and protected from disturbance.
• Maintain a safe exclusion zone around the hydraulic jack and reaction system.
• Apply and release the load in a controlled manner.
• Continuously observe the test arrangement for abnormal movement or instability.

10. Summary

The Initial Lateral Load Test is an important field investigation used to understand the behaviour of pile foundations under horizontal loading. The test combines a controlled hydraulic loading system, a stable reaction arrangement and displacement measurement to study the response of the pile.

At the site, the lateral load test arrangement was established to apply controlled horizontal load to the test pile and monitor the corresponding lateral displacement during loading and unloading.

11. Conclusion

Lateral pile load testing provides valuable field information for evaluating the response of pile foundations subjected to horizontal forces. The Initial Lateral Load Test is therefore an important verification step for pile foundation design and construction.

The test observations can be used by the project design and engineering team for assessing lateral pile behaviour in accordance with the applicable project requirements and IS 2911 (Part 4): 2013.

Note: This website blog intentionally excludes numerical test results, lateral displacement values, load displacement graphs and final capacity interpretation.

12. Reference

IS 2911 (Part 4): 2013 – Code of Practice for Design and Construction of Pile Foundations – Load Test on Piles.

Date: 28-08-2026

Team Members: Sharvesh R (Quality Manager, Geotechnical Engineer), V. Aravindhan (Geotechnical Engineer), S Hariharan (Geotechnical Engineer), Anima SR (Geologist), Jomey M. Susan Abraham (Geologist), P. Vijay (Project Coordinator)

Blog Writer: Jomey M. Susan Abraham, Geologist

Project in one line: A field-based waste characterization and geotechnical investigation undertaken at selected KSWMP locations in Shornur and Cherpulassery to understand waste characteristics and subsurface conditions.

Project Snapshot

• Locations: Shornur & Cherpulassery, Kerala
• Trial Pits: 7
• SPT: SPT

Detailed Project Execution Sequence

1. Project initiation and scope confirmation
2. Site Reconnaissance: Field visit and preliminary assessment
3. Mobilization: Equipment, manpower and field preparation
4. Location Marking: Identification of investigation points
5. Trial Pit Excavation: Excavation and waste exposure
6. Waste Sampling: Representative sample collection
7. Waste Characterization: Segregation, weighing and composition
8. Borehole Drilling: Subsurface investigation
9. SPT & Sampling: In-situ penetration testing and recovery
10. Laboratory Testing: Testing of collected samples
11. Engineering Analysis: Compilation and interpretation
12. Report & Submission: Technical reporting and client submission

Starting at the Site

The field programme began with site reconnaissance, mobilization and location marking. The investigation then moved into trial-pit excavation and representative waste sampling.

Waste Characterization

Waste characterization determines the composition of the waste stream by identifying, segregating and weighing representative waste fractions. For this project, the field programme included 7 trial pits, waste profiling, sample collection, logging and preservation. The stated sampling detail is 14 samples per 100 kg.

Waste characterization in the field involved excavation and separation of the waste using a JCB up to a depth of 3 m. The excavated waste was then segregated and quartered systematically, and representative samples were collected from the quartered material. All collected samples were properly labeled, documented, and preserved for further laboratory analysis.

Field Waste to a Representative Sample

The excavated waste is spread on a clean surface, thoroughly mixed and reduced using the quartering approach until a representative sample size is obtained.

1. Collect
2. Spread
3. Mix
4. Conical Heap
5. Four Quarters
6. Remove Opposite Two
7. Representative Sample

Sequence of Characterization: Sample Spread → Mix → Form conical heap → Divide into four quarters → Discard two diagonally opposite quarters → Mix remaining quarters → Collect representative sample → Label & preserve.

Waste Segregation & Measurement

The reduced sample is manually separated into predefined waste categories. Each fraction is weighed using a calibrated balance and recorded in the field data sheet.

Categories include: BIODEGRADABLE, PAPER, PLASTIC, GLASS, METALS, TEXTILES, RUBBER, WOOD, LEATHER, DOMESTIC HAZARDOUS, MISC.

The collected samples were subjected to laboratory analysis for the specified chemical parameters, in addition to the physical characterization, to determine their overall composition and characteristics.

Standard Penetration Test (SPT)

Reference standard: IS 2131 — Method for Standard Penetration Test for Soils.

Following the waste characterization study, borehole investigation and SPT were undertaken to assess the in-situ penetration resistance and document subsurface conditions at the investigated locations.

SPT Field Sequence

1. Advance Borehole: Drill to the required test depth and prepare the borehole.
2. Position Sampler: Place the standard split-spoon sampler at the test level.
3. Drive Sampler: Conduct the SPT using the prescribed hammer arrangement.
4. Record Penetration: Record penetration and blow observations.
5. Determine N-Value: Determine N-value in accordance with IS 2131.
6. Recover Sample: Recover, identify and preserve the disturbed sample.
7. Log the Stratum: Record depth, sample description and field observations.

From Field Work to Engineering Information

The integrated field investigation provides a structured basis for understanding waste characteristics and subsurface conditions and for developing the project technical report.

Falcon Industrial Testing Laboratory Pvt. Ltd. successfully completed a comprehensive geotechnical field investigation at Malur, Karnataka, to characterize subsurface conditions and evaluate key in-situ engineering properties. The programme comprised Standard Penetration Testing (SPT), Electrical Resistivity Testing (ERT), and Field California Bearing Ratio (CBR) testing.

Project at a Glance

Standard Penetration Test (SPT)

Standard Penetration Testing was carried out at two designated boreholes, BH-01 and BH-02, with reference to IS 2131, to assess in-situ ground resistance and document changes in subsurface strata with depth.

Field California Bearing Ratio (CBR)

Field CBR testing was conducted at three designated locations to assess the in-situ strength and load-bearing characteristics of the subgrade soil, with reference to IS 2720 (Part 31). At each location the surface was trimmed and levelled, the loading plate/mould assembly positioned, and a 50 mm diameter penetration piston advanced while load–penetration readings were recorded at 2.5 mm and 5.0 mm penetration.

Electrical Resistivity Testing (ERT)

ERT was conducted at two designated points using the Wenner four-electrode arrangement to evaluate the electrical resistivity characteristics of the subsurface.

Four electrodes were positioned in a straight line with equal spacing. A known electrical current was introduced into the ground through the two outer electrodes, while the potential difference was measured between the two inner electrodes. Apparent electrical resistivity was calculated from the measured current, potential difference and electrode spacing, and the recorded field values were compiled for technical interpretation of subsurface conditions, including changes in soil/rock strata, moisture conditions and possible anomalous zones.

Conclusion

The geotechnical field investigation at Malur, Karnataka, comprised two SPT boreholes, two ERT points and three Field CBR locations. The study gives the client data to take decisions on foundation type, safe bearing capacity of the soil, foundation depth, soil and rock profile, subgrade reaction, and electrical resistivity of soil for earthing purposes.

The Chennai Metro Rail expansion is one of the most critical urban infrastructure projects in South India. Falcon Industrial Testing Laboratory was appointed as the primary testing agency for multiple underground packages.

Our scope included comprehensive geotechnical investigation, ensuring the soil parameters met the strict TBM (Tunnel Boring Machine) requirements. Additionally, we conducted over 500 pile integrity tests and continuous concrete quality assurance throughout the construction phase.

As part of the NH45 extension, our teams conducted extensive soil bearing capacity testing and CBR evaluations.

We provided continuous pavement material analysis, asphalt testing, and subgrade evaluations, playing a vital role in ensuring the durability of this high-traffic corridor.

For this major thermal power plant construction, ensuring the structural integrity of the cooling tower foundations was of utmost importance.

We executed an in-depth structural audit, large-scale pile load testing, and comprehensive Non-Destructive Testing (NDT) to verify the quality of concrete and structural steel elements used in the massive foundations.

This 1.2 million sqft technology park required exhaustive building materials testing and environmental monitoring.

Our lab conducted daily cement and concrete analysis, structural steel tensile tests, and pre-construction Environmental Impact Assessments to ensure the project met international green building standards.

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Our services included wastewater chemical analysis, soil contamination testing, and continuous stack emission monitoring to validate the plant's operational efficiency.

The construction of a new deep-water berth demanded specialized marine geotechnical investigations.

We performed offshore soil drilling, underwater concrete testing, and rigorous corrosion assessments for marine piles, ensuring the berth's stability against tidal forces and saline environments.