TY  - JOUR
A1  - Pilz, Marco
A1  - Isken, Marius Paul
A1  - Fleming, Kevin
A1  - Orunbaev, Sagynbek
A1  - Moldobekov, Bolot
T1  - Long- and short-term monitoring of a dam in response to seasonal changes and ground motion loading
BT  - the test case of the Kurpsai Dam, Western Kyrgyz Republic
JF  - Pure and applied geophysics : PAGEOPH ; continuation of Geofisica pura e applicata
N2  - An experimental multi-parameter structural monitoring system has been installed on the Kurpsai dam, western Kyrgyz Republic. This system consists of equipment for seismic and strain measurements for making longer- (days, weeks, months) and shorter- (minutes, hours) term observations, dealing with, for example seasonal (longer) effects or the response of the dam to ground motion from noise or seismic events. Fibre-optic strain sensors allow the seasonal and daily opening and closing of the spaces between the dam's segments to be tracked. For the seismic data, both amplitude (in terms of using differences in amplitudes in the Fourier spectra for mapping the modes of vibration of the dam) and their time-frequency distribution for a set of small to moderate seismic events are investigated and the corresponding phase variabilities (in terms of lagged coherency) are evaluated. Even for moderate levels of seismic-induced ground motion, some influence on the structural response can be detected, which then sees the dam quickly return to its original state. A seasonal component was identified in the strain measurements, while levels of noise arising from the operation of the dam's generators and associated water flow have been provisionally identified.
KW  - Structural health monitoring
KW  - Dam engineering
KW  - Operational and environmental effects
KW  - Strong-motion
KW  - Strain
KW  - Elastic response
KW  - Kurpsai dam
Y1  - 2021
U6  - https://doi.org/10.1007/s00024-021-02861-5
SN  - 0033-4553
SN  - 1420-9136
VL  - 178
IS  - 10
SP  - 4001
EP  - 4020
PB  - Birkhäuser
CY  - Basel
ER  - 
TY  - JOUR
A1  - Roul, Pradip
A1  - Schinner, Alexander
A1  - Kassner, Klaus
T1  - Simulation of the strain distribution under a two-dimensional sand pile
JF  - Powder technology : an international journal on the science and technology of wet and dry particulate systems
N2  - We study the averaged macroscopic strain tensor for a sand pile consisting of soft convex polygonal particles numerically, using the discrete-element method (DEM). First, we construct two types of "sand piles" by two different pouring protocols. Afterwards, we deform the sand piles, relaxing them under a 10% reduction of gravity. Four different types of methods, three best-fit strains and a derivative strain, are adopted for determining the strain distribution under a sand pile. The results of four different versions of strains obtained from DEM simulation are compared with each other. Moreover, we compare the vertical normal strain tensor between two types of sand piles qualitatively and show how the construction history of the piles affects their strain distribution.
KW  - Numerical simulation
KW  - Sand pile
KW  - Stress
KW  - Strain
KW  - Granular matter
KW  - Discrete-element method
Y1  - 2011
U6  - https://doi.org/10.1016/j.powtec.2011.08.039
SN  - 0032-5910
VL  - 214
IS  - 3
SP  - 406
EP  - 414
PB  - Elsevier
CY  - Lausanne
ER  -