W 113 Technical Rule - Standard 03/2001
Determination of gravel-pack diameter and hydrogeological analysis of grain size distribution for purposes of well construction ++ PDF file ++
- Herausgeber/Verlag: DVGW
- Format: 21 pages
- Material: available as PDF only
- Ausgabe: 3rd edition 2001
- Hinweis: German version W 113
- Verkaufseinheit: 1
- Mindestabnahme: 1
- Artikel-Nr.: 510251
62,03 €*
Knowledge of the grain size distribution of water‑conducting granular soil is of great importance for the construction of wells and for the description of the hydrogeological conditions. It is in particular possible to determine the required gravel‑pack diameter in a well's filter section on the basis of the cumulative grain size curve and the grain size distribution curve. In addition, it is possible to derive estimated data for the coefficient of hydraulic conductivity and the porosity of the examined soil sample. Results of the DVGW Research project Examinations on the stability and clogging of sand and gravel filters during drilling (DVGW 1982) have been included in the here described procedure to determine the required gravel‑pack diameter. Compared to the Technical Standard W 113 Determination, representation and evaluation of the grain size distribution of water‑conducting granular soils for geohydrological examinations and for the construction of wells from the year 1983, different practical possibilities for determining the required gravel‑pack diameter and the hydrogeological parameters coefficient of hydraulic conductivity and porosity are demonstrated. Apart from determining the grain size distribution, details on its representation and especially on its evaluation have been provided.
Preamble
1 Scope
2 Definitions
3 Introduction
4 Sampling and selection of samples
5 Determination and illustration of grain size distribution
5.1 General
5.2 Sieving analysis
5.2.1 Sieving machine
5.2.2 Analysis sieves
5.2.3 Sieving
5.2.3.1 General
5.2.3.2 Dry sieving
5.2.3.3 Wet sieving
5.3 Representation of the grain size distribution
6 Evaluation of grain size distribution
6.1 Determination of the required gravel-pack diameter (DS)
6.1.1 General
6.1.2 Determination of the decisive grain diameter (dg)
6.1.3 Determination of the filter coefficient (Fg)
6.1.4 Selection of gravel-pack category
6.2 Determination of coefficient of hydraulic conductivity and of porosity
6.2.1 General
6.2.2 Coefficient of hydraulic conductivity (kf value)
6.2.3 Porosity
7 Examples
8 Technical rules and literature
Annex A: Data sheet for sieving analyses (examples)
Annex B: Cumulative and distribution curves (examples from Annex A)
Annex C: Form for sieving analyses acc. to DVGW Technical Bulletin W 113
Annex D: Form for cumulative and distribution curves
1 Scope
2 Definitions
3 Introduction
4 Sampling and selection of samples
5 Determination and illustration of grain size distribution
5.1 General
5.2 Sieving analysis
5.2.1 Sieving machine
5.2.2 Analysis sieves
5.2.3 Sieving
5.2.3.1 General
5.2.3.2 Dry sieving
5.2.3.3 Wet sieving
5.3 Representation of the grain size distribution
6 Evaluation of grain size distribution
6.1 Determination of the required gravel-pack diameter (DS)
6.1.1 General
6.1.2 Determination of the decisive grain diameter (dg)
6.1.3 Determination of the filter coefficient (Fg)
6.1.4 Selection of gravel-pack category
6.2 Determination of coefficient of hydraulic conductivity and of porosity
6.2.1 General
6.2.2 Coefficient of hydraulic conductivity (kf value)
6.2.3 Porosity
7 Examples
8 Technical rules and literature
Annex A: Data sheet for sieving analyses (examples)
Annex B: Cumulative and distribution curves (examples from Annex A)
Annex C: Form for sieving analyses acc. to DVGW Technical Bulletin W 113
Annex D: Form for cumulative and distribution curves