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Groundwater inflow into excavations (quarrys)

Groundwater inflow into excavations (quarrys)

Groundwater inflow into excavations (quarrys)

(OP)
We are having trouble finding information on estimating groundwater inflow into an excavated quarry. If anyone has any information/resources that would be of use it would be much appreciated. thanks.

RE: Groundwater inflow into excavations (quarrys)

You are likely dealing with fracture flow in rock.  You will have to do pump tests to establish the rock mass in-situ permeability, which is not easy and will vary with depth and place.  I know people who do this work routinely and can put you in touch with them if you like.

RE: Groundwater inflow into excavations (quarrys)

First of all, what type of rock are you quarrying and for what purpose?  In sedimentary rocks like limestones and dolomites inflows will consist primarily of wwweps and seeps along bedding planes plus inflows along joints. With granites or gneisses it will be essentially fracture flow.  Estimating inflows on fractures requires a knowledge of several physical parameters: fracture aperture(opening width), fracture spacing, fracture hydraulic conductivity (K sub f), and rock matrix hydraulic conductivity (K sub m).  K sub m can be measured in the lab, but the other parameters must be obtained in the field.  As Phillyfrank stated, K sub f requires a pump test. Hope this helps.

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