Assessing the Efficiency of Thermochemical Pressurization in the Jiweishan Rockslide

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F23%3A10476851" target="_blank" >RIV/00216208:11310/23:10476851 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=94x9jewk71" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=94x9jewk71</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00603-023-03639-y" target="_blank" >10.1007/s00603-023-03639-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Assessing the Efficiency of Thermochemical Pressurization in the Jiweishan Rockslide

Popis výsledku v původním jazyce

Thermochemical pressurization is a possible weakening mechanism that could explain the hypermobility of large landslides in carbonate rock. However, the factors controlling the efficiency of this mechanism in generating hypermobility have not been elucidated. Here, we use mass and energy conservation equations - accounting for the thermal decomposition of carbonate and a thermoporoelastic mechanism - to evaluate the efficiency of thermochemical pressurization in the 2009 Jiweishan rockslide event in China. We consider distinct permeability functions for the shear zone and the rock wall, controlled by distinct mechanical processes, and explore the sensitivity of the model to changes in the values of the key parameters. We evaluate that a combination of pore pressure increase and the endothermic nature of the chemical reaction may effectively limit frictional heating. We observe that the increase in pore pressure is controlled by the permeability of the rock wall rather than by that of the shear zone and its thickness. We also find that the permeability of the damaged rock wall is the key factor controlling the energy ratio-a measure of efficiency. We conclude that the comparatively low velocity and small thickness of the sliding body, and the relatively high permeability of the formation in which the Jiweishan landslide developed may have limited the effect of thermal decomposition.

Název v anglickém jazyce

Assessing the Efficiency of Thermochemical Pressurization in the Jiweishan Rockslide

Popis výsledku anglicky

Thermochemical pressurization is a possible weakening mechanism that could explain the hypermobility of large landslides in carbonate rock. However, the factors controlling the efficiency of this mechanism in generating hypermobility have not been elucidated. Here, we use mass and energy conservation equations - accounting for the thermal decomposition of carbonate and a thermoporoelastic mechanism - to evaluate the efficiency of thermochemical pressurization in the 2009 Jiweishan rockslide event in China. We consider distinct permeability functions for the shear zone and the rock wall, controlled by distinct mechanical processes, and explore the sensitivity of the model to changes in the values of the key parameters. We evaluate that a combination of pore pressure increase and the endothermic nature of the chemical reaction may effectively limit frictional heating. We observe that the increase in pore pressure is controlled by the permeability of the rock wall rather than by that of the shear zone and its thickness. We also find that the permeability of the damaged rock wall is the key factor controlling the energy ratio-a measure of efficiency. We conclude that the comparatively low velocity and small thickness of the sliding body, and the relatively high permeability of the formation in which the Jiweishan landslide developed may have limited the effect of thermal decomposition.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Rock Mechanics and Rock Engineering

ISSN

0723-2632

e-ISSN

1434-453X

Svazek periodika

57

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

AT - Rakouská republika

Počet stran výsledku

14

Strana od-do

793-806

Kód UT WoS článku

001101725500001

EID výsledku v databázi Scopus

2-s2.0-85176812802