SIST EN ISO 12958-2:2021 PDF

Name: SIST EN ISO 12958-2:2021 — Geotextiles and geotextile-related products - Determination of water flow capacity in their plane - Part 2: Performance test (ISO 12958-2:2020)
SKU: SIST EN ISO 12958-2:2021
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Geotextiles and geotextile-related products - Determination of water flow capacity in their plane - Part 2: Performance test (ISO 12958-2:2020)

Название (английский):

SIST EN ISO 12958-2:2021

Geotextiles and geotextile-related products - Determination of water flow capacity in their plane - Part 2: Performance test (ISO 12958-2:2020)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 24
Дата публикации:: 17 ноября 2020 г.
ICS:: 59.080.70
Технический комитет:: ITEK - Textile and textile products

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Описание (английский):

This document specifies a method for determining the constant-head water flow capacity within the plane of a geotextile or geotextile-related product, using boundary materials and test conditions of interest. A standard series of test conditions are proposed, involving soil confinement, low hydraulic gradients, seating times and an array of normal loads.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

EN ISO 12958-2:2020 (ISO 12958-2:2020) defines a laboratory performance test for measuring the constant‑head in‑plane water flow capacity of geotextiles and geotextile‑related products. The standard specifies test apparatus, specimen preparation, boundary materials and a series of standard test conditions that reflect realistic project situations - including soil confinement, low hydraulic gradients, varied normal loads and seating times - so that transmissivity (flow per unit width) can be determined under service‑relevant conditions.

Key topics and requirements

Scope: Determines constant‑head, in‑plane flow capacity using boundary materials and conditions of interest; proposes a set of standard test conditions.

Test principle: Measures volumetric flow rate per unit width under a defined normal compressive stress (σ), hydraulic gradient (i), seating time (t) and boundary conditions (b).

Specimen handling and selection: Requirements for number, dimensions and conditioning of specimens; guidance on granular boundary materials and soil confinement.

Apparatus & procedure: Details on test equipment, seating and loading procedures, low‑gradient constant‑head setup, and measurement practice.

Calculations & reporting: Methods to express performance in‑plane water flow capacity (q_perf), correction factors (e.g., temperature conversion), and required test report content.

Special considerations:

Geotextile intrusion into drainage cores and its effect on transmissivity.
Directional testing for products with discrete draining elements (flow may be direction‑dependent).
Limitations regarding long‑term creep, chemical/biological clogging and durability - these require additional standards or assessment.

Applications and practical value

Provides a realistic laboratory method to evaluate in‑plane transmissivity of drainage geotextiles and geocomposites under project‑specific conditions.

Useful for:

Product development and quality control by manufacturers.
Specification and acceptance testing by owners, consultants and test laboratories.
Design verification where soil confinement, low hydraulic gradients and service loading influence drainage performance (e.g., landfills, retaining structures, pavements, subsurface drainage systems).

Helps assess the impact of soil‑geotextile interaction and seating/creep on short‑ to mid‑term in‑plane flow capacity.

Related standards

ISO 12958-1 (other part of the series)

ISO 18325 (prefabricated vertical drains)

ISO 9862 (sampling and specimen preparation)

ISO 9863-1 (thickness at specified pressures)

ISO 10318-1 (terms and definitions)

ISO/TR 18228-4 (information on hydraulic gradient significance)

Keywords: geotextiles, in‑plane water flow capacity, transmissivity, EN ISO 12958-2:2020, geotextile performance test, hydraulic gradient, soil confinement, seating time.

SIST EN ISO 12958-2:2021 PDF

Abstract

Похожие стандарты

SIST EN ISO 12958-2:2021 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and practical value

Who should use this standard

Related standards

Технические детали

ISO 12958-2:2020

Geotextiles and geotextile-related products — Determination of water flow capacity in their plane — Part 2: P…

SIST EN ISO 12958-1:2021

Geotextiles and geotextile-related products - Determination of water flow capacity in their plane - Part 1: I…

BS ISO 18325:2015

Geosynthetics. Test method for the determination of water discharge capacity for prefabricated vertical drain…

SIST EN ISO 9862:2024

Geosynthetics - Sampling and preparation of test specimens (ISO 9862:2023)

ISO 9863-1:2016/Amd 1:2019

Geosynthetics — Determination of thickness at specified pressures — Part 1: Single layers — Amendment 1

SIST EN ISO 10318-1:2026

Geosynthetics - Part 1: Vocabulary (ISO 10318-1:2026)

PD ISO/TR 18228-4:2022

Design using geosynthetics - Drainage