Description

Diapirism is the process of piercing or rupturing of domed or uplifted rocks by mobile core material, such as magma, salt or clay. In this context it refers only to clay diapirism, since the effects of magma are considered elsewhere in the FEP list and salt does not occur in the region of interest.

Category

Category of FEP

Geosynthesis

Sub-category

Sub-category of FEP

Internal geodynamic events - plastic deformation of host rock

Ondraf Niras FEP Number

Ondraf Niras FEP Number

36

FEP Effects

Description of FEP Effects

Changing stability; changes in the stress field; pushing the waste upwards. Changes in host rock pore structure (fracturing, creation of preferential pathway). Dilution capacity of aquifer changes.

Plastic deformation may change shape of host rock layer and its physical properties such as density, preferred orientation of host rock minerals and porosity.

Reference(s)

References Relevant to FEP

ER-184_I2 RD&D Plan

NEA TN2 IFEP Reference(s)

Related IFEPs from the NEA TN2 List of Proposed IFEP Revisions [NEA/RWM/R(2013)8]

1.2.3 Deformation (elastic, plastic or brittle).