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.
