Seismic precursor to instability induced by internal erosion in loose granular slopes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F19%3A10402609" target="_blank" >RIV/00216208:11310/19:10402609 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=icrtqUBMsk" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=icrtqUBMsk</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1680/jgeot.17.P.079" target="_blank" >10.1680/jgeot.17.P.079</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Seismic precursor to instability induced by internal erosion in loose granular slopes

Popis výsledku v původním jazyce

Fluidised landslides are one of the most dangerous types of mass movements as they can run over long distances at high velocity. A flow-like landslide can occur in both artificially designed and natural slopes, resulting in extensive property damage and significant loss of life. Although various studies have examined the initiation mechanism of this type of landslide, the understanding of the phenomenon of instability which can occur in loose granular slopes deserves further attention. Specific influential factors, such as the changes in the soil microstructure due to water infiltration and seepage forces, still need to be further examined. In this study, the initiation of a fluidised landslide is investigated through flume tests. The tested material was collected from a coseismic landslide deposit in the 2008 Wenchuan earthquake area. These loose, granular deposits can fail due to intense rainfall and exhibit flow-like movement, potentially evolving into destructive debris flows. Two flume apparatuses have been used, which were equipped with multiple sensors to evaluate the pore pressures and the internal displacements. A high-sensitivity seismic accelerometer was installed at the bottom of the flume to record the vibrations produced by the movement of the soil particles during the tests. The soil mass was progressively wetted either by a uniform inflow from the ground surface at the top of the slope, to simulate the infiltration of run-off water arriving from upslope, or by a gradual rise of the water level at the upper boundary of the slope, to simulate a gradual rise of the groundwater table. Internal erosion of the finer soil fraction driven by the seepage forces is thought to have played a significant role in the slope collapse. Possible changes in the particle arrangement were recorded by the accelerometers in the form of an increasing high-frequency vibration signal before any significant rise of pore pressure and any significant displacement of the slope could be observed. Although further parametric investigation is still necessary, and tests at real scale should be devised, the observed behaviour suggests that seismic monitoring of loose, granular deposits could be a promising method for detecting an incipient slope collapse.

Název v anglickém jazyce

Seismic precursor to instability induced by internal erosion in loose granular slopes

Popis výsledku anglicky

Fluidised landslides are one of the most dangerous types of mass movements as they can run over long distances at high velocity. A flow-like landslide can occur in both artificially designed and natural slopes, resulting in extensive property damage and significant loss of life. Although various studies have examined the initiation mechanism of this type of landslide, the understanding of the phenomenon of instability which can occur in loose granular slopes deserves further attention. Specific influential factors, such as the changes in the soil microstructure due to water infiltration and seepage forces, still need to be further examined. In this study, the initiation of a fluidised landslide is investigated through flume tests. The tested material was collected from a coseismic landslide deposit in the 2008 Wenchuan earthquake area. These loose, granular deposits can fail due to intense rainfall and exhibit flow-like movement, potentially evolving into destructive debris flows. Two flume apparatuses have been used, which were equipped with multiple sensors to evaluate the pore pressures and the internal displacements. A high-sensitivity seismic accelerometer was installed at the bottom of the flume to record the vibrations produced by the movement of the soil particles during the tests. The soil mass was progressively wetted either by a uniform inflow from the ground surface at the top of the slope, to simulate the infiltration of run-off water arriving from upslope, or by a gradual rise of the water level at the upper boundary of the slope, to simulate a gradual rise of the groundwater table. Internal erosion of the finer soil fraction driven by the seepage forces is thought to have played a significant role in the slope collapse. Possible changes in the particle arrangement were recorded by the accelerometers in the form of an increasing high-frequency vibration signal before any significant rise of pore pressure and any significant displacement of the slope could be observed. Although further parametric investigation is still necessary, and tests at real scale should be devised, the observed behaviour suggests that seismic monitoring of loose, granular deposits could be a promising method for detecting an incipient slope collapse.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

O - Projekt operacniho programu

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Geotechnique

ISSN

0016-8505

e-ISSN

—

Svazek periodika

Neuveden

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

989-1001

Kód UT WoS článku

000446875900004

EID výsledku v databázi Scopus

2-s2.0-85053426636