Accelerated disintegration of in situ disconnected portions of sandstone outcrops

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F21%3A00545009" target="_blank" >RIV/67985831:_____/21:00545009 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/21:10438762

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0169555X21003056" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0169555X21003056</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.geomorph.2021.107897" target="_blank" >10.1016/j.geomorph.2021.107897</a>

Result language

angličtina

Original language name

Accelerated disintegration of in situ disconnected portions of sandstone outcrops

Original language description

Sandstoneweathering/disintegration is a complex process involving loose material production, rockfall phenomena, and creation of picturesque natural sceneries. On historical monuments, they induce damage to building stone. Here we present a newlook on sandstone weathering/recession the central aspect of which is rapid disintegration of portions of the rock massif, which are no longer physically connected with the main rock mass, though still in situ. A set of field and laboratory measurements including mechanical (tensile strength, drilling resistance) and hydraulic (permeability, surface moisture) methodswere applied to compare the properties of the disconnected portions with those of the surrounding rock mass. Also, physicalweathering experimentswere performed to characterize the effect of confinement on the breakdown rate of several sandstone samples. The presence of disconnected portions is very common in dry climates where they are usually elongated parallel to horizontal surfaces. In humid temperate climates, however, they are less abundant, being elongated mostly vertically. The surfaces of disconnection followbedding planes, planar elements of other sedimentary structures, and subhorizontal fractures, and stress shadows on subvertical cliff faces. Weathered surfaces of the disconnected portions show reduced tensile strength and drilling resistance values, a faster capillary water absorption and a higher surface moisture compared to the much less weathered surfaces of the surrounding rock mass. Physical experiments demonstrated that a confinement by the surrounding rockmassmay considerably delay the loosening of rock during weathering. The much faster disintegration rates of the disconnected portions of rock compared to their surroundings are explained by the fact that they are not confined and have a larger surface area. The recession rates of sandstone surfaces with disconnected portions are highly variable both in space and time and their genesis can be demonstrated by two suggested conceptual models.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10508 - Physical geography

Project

<a href="/en/project/GA19-14082S" target="_blank" >GA19-14082S: Stress- and hydraulic field-controlled weathering and erosion of granular rocks</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geomorphology

ISSN

0169-555X

e-ISSN

1872-695X

Volume of the periodical

391

Issue of the periodical within the volume

October

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

19

Pages from-to

107897

UT code for WoS article

000702576200003

EID of the result in the Scopus database

2-s2.0-85113414509