The concept of pull-out resistance plays an essential role in geotechnical engineering and construction projects. It determines how well geosynthetics and soil anchors stay firmly lodged under tension. Proper pull-out resistance is vital for ensuring the safety and stability of structures as it assists in the prevention of failures and thereby structural integrity. It is important to consider pull out resistance in projects which involves soil reinforcement, retaining walls and slope stabilisation.
Pull-out resistance is defined as the amount of force required to remove a geosynthetic material or anchor from the surrounding soil. It is usually measured as force per unit length (kN/m). Pull-out-resistance is influenced by several factors. They are:
Pull-out resistance is significant to ensure structural durability and stability under load and does not hamper due to excessive movement. For instance, geosynthetic reinforcement in retaining walls must have sufficient pull-out resistance to withstand lateral soil pressures.
Anchors are the versatile ground embedded devices to prevent horizontal movement by withstanding uplift and lateral forces. The pull out resistance of anchors have different resistance characteristics depending upon the factors listed below:
Each anchor type varies in terms of resistance based on factors such as material composition, weight, and installation depth. For example, concrete anchors have stronger resistance due to their mass, making them ideal for retaining walls and other structures subjected to high loads. In civil engineering, the pull-out resistance of geosynthetics (e.g., geogrids, geotextiles) is critical for soil reinforcement, slope stabilisation, and landfill containment. The factors influencing this resistance include:
Applications such as reinforced earth structures, embankments, and landfill liners rely heavily on the pull-out resistance to ensure long-term stability.
The concept of pull- out resistance is widely used in various fields like civil engineering, construction, agriculture etc. It helps in the selection of perfect materials and connectors which allows for improved design and thereby, more proven outcomes. In civil engineering, it plays a vital role in projects such as:
In Agriculture, geosynthetics like geotextiles and geomembranes help in drainage and erosion control and ensure that they stay anchored in place under various environmental conditions.
The pullout test is the most common experimental method of geosynthetic design to comprehend pull -out resistance under various controlled conditions. The test is relatively simple, cost-effective and also feasible. This test examines the friction between geosynthetics and the surrounding reinforced soil composition. These tests help the engineers with safety assurance, quality material selection, design validation and quality control. Two primary testing methods used to measure the pull-out resistance are Laboratory tests and field tests.
In laboratory settings, soil samples are placed in a controlled environment to measure the pull -out force of the specific soil conditions. The method enables detailed governing of the soil conditions like moisture and compaction to study their consequence on pull- out resistance. Usually, the laboratory installation includes a large pullout box, a sleeve, a clamping system, a servo hydraulic control system and a set of external transducers. Various types of laboratory pull-out tests includes,
The pull -out force is measured directly in field settings and used to measure the performance of anchors, piles and soil nails in real world conditions. These tests help to interpret the working of various installation methods under actual loads and environmental circumstances. Common methods of field pull-out test are :
In both these tests, compressed stress is applied to the top soil layer and horizontal force to the geosynthetics and the force required to pull out the geosynthetics and anchors out of the soil is captured. Usually, larger specimens have higher pull- out resistance.
Geogrids are the most widely used geosynthetics for soil reinforcement, erosion control, soft soil embankments and for enhancing stability. Pull out resistance of geogrids is composed of skin friction on the surface of the geogrid ribs and bearing resistance deployed against the transverse members. Their pull-out resistance is influenced by
These characteristics make geogrids highly effective in soft soil embankments and retaining walls, where they offer enhanced stability and reduce the risk of structural failure.
Pull-out-strength is a relevant parameter used to indicate the maximum force applied to pull a component out of another without resulting in any failure, whereas pull-out-resistance refers to the overall potential of a system to resist pull-out. pull-out strength is affected by several factors like type of the material, surface area, installation techniques , embedment depth and environmental conditions and is crucial for ensuring stability and safety of the structures. It is typically measured in units of force. Pull-out strength is a specific measurable value whereas resistance is the overall potential of a system to resist pull-out.
Pull out resistance places a key consideration in influencing the effectiveness and security of various engineering solutions. But , Pull-out resistance would not be sufficient to manage abrupt impacts and may always require regular inspection during specific intervals. Hence, proper evaluation of pull out resistance not only enhances the stability of structures but also refines material usage and mitigates the long term maintenance costs.
Tell us a little about yourself and what you’re looking for, and our experts will get back to you with a perfect solution!
Director, President – Glen Raven Technical Fabrics
Strata/Glen Raven tenure: 10 years/28 years
Total industry experience: 35 years
MBA – Wake Forest University
Directs the strategic direction of Glen Raven’s automotive, protective apparel, military, geogrid, outdoor and logistic businesses.
Director, General Manager, Strata Inc.
Strata/Strata Inc. tenure: 3 years/14 years
Total industry experience: 25 years
MBA – Georgia State University
Led the integration of Strata Inc. business operations into the headquarters of GRTF and transition from USA based to India based manufacturing.
Director
Strata tenure: 17 years
Total industry experience: 47 years
CA – ICA
Played a key role in the establishment of Strata’s India operations. Provides vision for product innovation and leveraging new technology trends.
Global Technical Sales Director
Strata tenure: 7 years
Total industry experience: 32 years
Civil & Geotechnical Engineer (First class)
Provides highly technical and innovative civil engineering solutions in India and around the world. Responsible for the design and execution of large-scale geotechnical projects around the world including Australia, Asia, Europe, Africa, Middle East, and South America.
CTO – Chief Technology Officer
Strata tenure: 9 years
Total industry experience: 48 years
BTech (Hons), MTech (Civil) Both IIT Bombay, DMS (Bombay University), FIE, FIGS, Chartered Engineer
Streamlines the designs of Geosynthetics and has brought innovation in geogrid and geocell design application.
COO – Projects and Sales
Strata tenure: 13 years
Total industry experience: 24 years
MBA – University of Gujarat
Leads the monetization of products and solutions while ensuring highest execution quality and project profitability.
COO – Technical Textiles
Strata tenure: 13 years
Total industry experience: 33 years
BE (Mechanical) – Nagpur University
Drives excellence in process design, product features and cost effectiveness in production.
CFO – Chief Financial Officer
Strata tenure: 8 years
Total industry experience: 35 years
CA – ICA, ICWA – ICWAI
Leads the finance, accounting, taxation, commercial, legal and IT functions and assisting on all strategic and operational matters.
CDO – Chief Development Officer
Strata tenure: 10 years
Total industry experience: 13 years
MBA – ISB, Hyderabad
Leads diversification of the product portfolio, monetizing the new products and ensuring successful sustained financial growth of the company top line.
CEO – Chief Executive Officer
Strata tenure: 14 years
Total industry experience: 42 years
B Tech (Chemical) – IIT Delhi
Leads day-to-day business operations of the company with focus on capacity expansion, product and process improvement.
Tell us a little about yourself and what you’re looking for, and our experts will get back to you with a perfect solution!