Flexible Earth Drain with Segmented Core for Pore Water Relief

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Solution Overview

Problem

Current methods for draining pore water pressure in soils, particularly during static and seismic events, are inefficient and costly, especially for cohesive and granular soils, leading to potential liquefaction and structural instability.

Innovation Solution

A high flow capacity flexible earth drainage system featuring a central core of synthetic material with low bending stiffness and a surrounding filter fabric, allowing for rapid installation and wider spacing of flexible earth drains that can be coiled and spooled for efficient transport and installation, effectively draining pore water pressure and mitigating liquefaction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional Prefabricated Vertical Drains (PVDs) are used, then installation is relatively quick and efficient, but the drainage capacity is limited due to small diameter (typically 1/8-inch thick and three to four inches wide)

Engineering Contradiction:

Improvedrainage capacityVSAvoidinstallation ease

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The flexible drain is divided into multiple panels that can be coiled and spooled, allowing the drain to be fed continuously through the mandrel during installation. This segmentation enables rapid installation while maintaining high drainage capacity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The drain uses a flexible synthetic material construction that can be coiled and spooled on installation rigs, providing both high drainage capacity and ease of installation comparable to conventional PVDs

Inventive Principle:

Principle #30Flexible shells and thin films

2Productivity

If larger diameter drains are used to increase drainage capacity, then wider spacing is possible, but quick and efficient installation methods are currently limited

Engineering Contradiction:

Improvedrainage capacityVSAvoidinstallation method availability

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The drain transitions from a rigid structure to a flexible, dynamic form that can be coiled and spooled. This flexibility enables the drain to be fed through standard mandrels during installation, providing both large equivalent diameter for high capacity and ease of installation

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The flexible synthetic material construction allows the drain to be coiled and spooled on installation rigs, enabling rapid installation of large equivalent diameter drains using standard equipment

Inventive Principle:

Principle #30Flexible shells and thin films

3Speed

If vertical drainage elements are installed to speed drainage in cohesive soils, then drainage rate improves, but installation cost and complexity increase

Engineering Contradiction:

Improvedrainage rateVSAvoidinstallation complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The flexible drain construction simplifies installation by allowing the drain to be pushed into the ground using standard mandrels, reducing installation complexity while maintaining high drainage rates in cohesive soils

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The drain uses a flexible synthetic material with controlled thickness and width parameters that optimize both drainage capacity and ease of installation, reducing complexity while improving drainage rate

Inventive Principle:

Principle #35Parameter changes

4Productivity

If conventional PVDs are used with small thickness (1/8-inch), then the drain can be easily coiled and spooled, but the drainage capacity is limited

Engineering Contradiction:

Improvedrainage capacityVSAvoiddrain thickness

Core Design Contradiction:

ProductivityVSShape

Solution Approach 1:

The flexible synthetic material construction maintains the ability to be coiled and spooled while increasing the effective drainage capacity through optimized thickness and width parameters, resolving the contradiction between capacity and coilability

Inventive Principle:

Principle #30Flexible shells and thin films

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system provides rapid and economical drainage, reducing the risk of liquefaction and structural instability during seismic events, while also being cost-effective and efficient in treating a variety of soil types, with installation speeds comparable to conventional Prefabricated Vertical Drains.

Implementation Method 1

a surrounding filtration material (e.g., geotextile filter fabric sleeve) that filters the natural soil from entering the drainage core during flow

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 2

for relieving static and seismically-induced pore water pressure in the ground

Methodology Applied

Scientific EffectGravity-driven flow: Gravitation

Implementation Method 3

The system provides rapid and economical drainage, reducing the risk of liquefaction

Methodology Applied

Scientific EffectPressure gradient flow: Pressure Gradient

Data Source

PatentUS12188196B2High flow capacity flexible earth drainage system and method for relieving and conveying pore water

Publication Date: 2025.01.07 AMERICAN PREFABRICATED DRAIN LLC

AI summary

A high flow capacity flexible earth drainage system and method for relieving and conveying pore water is disclosed. In some embodiments, the presently disclosed high flow capacity flexible earth drainage system and method provide an arrangement of high flow capacity flexible earth drains, wherein each flexible earth drain may include one or more flexible ridged panels, one or more single-sided flexible ridged panels, one or more two-sided flexible ridged panels, and/or one or more flexible zigzag panels arranged longitudinal within a geotextile filter fabric sleeve. Further, a method is provided of installing the high flow capacity flexible earth drains to form the presently disclosed high flow capacity flexible earth drainage system for relieving and conveying pore water.