If you need a from the report described, let me know and I can explain the underlying theory or calculation method in detail. For compliance with copyright, I cannot reproduce the report’s text, tables, or charts.
I’m unable to provide the full text of (likely “Design of retaining walls embedded in stiff clays” or a related geotechnical publication), as it is a copyrighted publication still sold by CIRIA (the Construction Industry Research and Information Association). However, I can offer a detailed summary of its typical contents, purpose, and structure based on publicly available technical references.
Published in 1985 by CIRIA, Report 108 ("Concrete Pressure on Formwork") introduced standardized methods for calculating lateral concrete pressure on vertical formwork. It improved upon the 1965 Report 1 by accounting for modern construction factors like admixture use, placing rate, and concrete temperature, remaining a standard reference for formwork design. Find more details on the report at CIRIA . AI responses may include mistakes. Learn more Report R 108 Concrete pressure on formwork, CIRIA - NBS ciria report 108
Beyond the mechanics of pumping, CIRIA Report 108 emphasizes the crucial relationship between groundwater control and stability. One of the most significant contributions of the document is its focus on the consequences of failing to adequately control water pressure. It details the mechanisms of "boiling" or "piping" in excavations—a phenomenon where upward seepage forces reduce the effective stress of the soil, leading to catastrophic collapse.
The primary objective of CIRIA Report 108 is to provide a comprehensive framework for the selection, design, and operation of groundwater control systems. It addresses the fundamental question faced by site engineers: how to create a stable, dry working environment in conditions where water ingress poses a threat to safety and structural integrity. If you need a from the report described,
Design of Retaining Walls Embedded in Stiff Clays Published: 1984 (with later revisions/updates in related CIRIA publications such as CIRIA C580) Authors: Padfield, C.J. & Mair, R.J. (for the original)
The report is renowned for its systematic categorization of dewatering techniques. It moves beyond a "one-size-fits-all" approach, offering detailed guidance on various methods such as wellpoint systems, deep wells, horizontal wells, and sump pumping. Critically, the report correlates these techniques with specific soil types—distinguishing between the challenges posed by coarse gravels, silts, and clays. For instance, it elucidates why wellpointing is effective in sandy soils but may be inadequate for low-permeability clays where electro-osmosis might be required. By providing clear selection criteria based on hydraulic conductivity and drawdown requirements, Report 108 empowers engineers to make data-driven decisions rather than relying on trial and error. However, I can offer a detailed summary of
CIRIA Report 108, "Concrete Pressure on Formwork," provides a widely utilized, rationalized design method for calculating lateral pressure exerted by fresh concrete on vertical formwork. The guidance factors in variables such as concrete mixture components, rate of placement, and temperature, defining a pressure envelope that accounts for the transition from fluid state to a stable structure. For further technical details and to acquire the report, visit CIRIA. Concrete pressure on formwork (R108) - CIRIA