Characterisation and appropriate development of sites on dolomite

Abstract

This document attempts to give broad and consequently simplified background information pertinent to understanding the significance of the need to characterise the stability of dolomitic land prior to development. A single frameworK of reference for the execution of stability investigations is proposed. This proposal was formulated after reviewing existing classification systems, investigation procedures and stability investigation reports: In adition, extensive consultations were held with engineering geologists, geotechnical and civil engineers, geohydrologists, hydrologists and town and regional planners. This proposed approach is entitled the "Method of Scenario Supposition" and essentially provides a general set of factors to be utilised as a check list defining a deductive process and culminating in a stability characterisation. The factors for the characterisation of the risk of doline and sinkhole formation have been defined as has associated terminology. This characterisation process culminates in the expression of the stability in terms of the risk of doline and sinkhole formation. Proposals are made concerning appropriate development in relation to identified risk categories. The method of scenario supposition is reviewed in the context of a case study area on a non-dewatered dolomitic aquifer and in the context of twenty smaller, randomly selected, case study areas in compartments subjected to artificial drawdown of the groundwater level.