ISO 22476-11:2017 PDF
Geotechnical investigation and testing — Field testing — Part 11: Flat dilatometer test
Geotechnical investigation and testing — Field testing — Part 11: Flat dilatometer test
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 17
- Дата публикации:
- 20 апреля 2017 г.
- Издание:
- ISO IS 22476 edition 1 version 1
- ICS:
- 93.020
ISO 22476-11:2017 establishes guidelines for the equipment requirements, execution of and reporting on flat dilatometer tests. NOTE This document fulfils the requirements for flat dilatometer tests as part of the geotechnical investigation and testing according to EN 1997‑1 and EN 1997‑2. The basic flat dilatometer test consists of inserting vertically into the soil a blade-shaped steel probe with a thin expandable circular steel membrane mounted flush on one face and determining two pressures at selected depth intervals: the contact pressure exerted by the soil against the membrane when the membrane is flush with the blade and, subsequently, the pressure exerted when the central displacement of the membrane reaches 1,10 mm. Results of flat dilatometer tests are used mostly to obtain information on soil stratigraphy, in situ state of stress, deformation properties and shear strength. It is also used to detect slip surfaces in clays. The flat dilatometer test is most applicable to clays, silts and sands, where particles are small compared to the size of the membrane.
Abstract
Overview - ISO 22476-11:2017 (Flat dilatometer test, DMT)
ISO 22476-11:2017 specifies requirements for performing and reporting the flat dilatometer test (DMT) as part of geotechnical investigation and field testing. The standard covers equipment, test procedure, membrane calibration, data acquisition and reporting. It fulfils flat dilatometer test requirements for geotechnical investigations in accordance with EN 1997‑1 and EN 1997‑2.
The DMT involves vertically inserting a blade-shaped steel probe with a thin circular steel membrane and recording two key pressures as the membrane expands: the pressure at 0.05 mm centre deflection (A‑pressure) and at 1.10 mm (B‑pressure), plus a controlled rebound pressure (C‑pressure). Typical sounding depth increments are 100–300 mm.
Key topics and technical requirements
- Equipment: dilatometer blade and membrane, control & calibration unit, pressure source, pneumatic‑electrical cable, earth wire, calibration syringe; optional automated data acquisition and load cell.
- Membrane and blade: blade dimensions, membrane mounting and penetrating edge geometry are specified; membrane calibration before and after testing is required.
- Pressure measurements:
- A‑pressure (0.05 mm) and B‑pressure (1.10 mm) detections via internal switch mechanism;
- C‑pressure measured during controlled deflection recovery.
- Control unit features: earthing socket, controlled gas flow/venting, signal detection for switch activations, pressure measurement with reproducibility (2.5 kPa for
Технические детали
- Технический комитет
- ISO/TC 182 - Geotechnics
- SKU
- ISO 22476-11:2017
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