Combining in situ monitoring using seabed instruments and numerical modelling to assess the transient stability of underwater slopes

2018 ◽  
Vol 477 (1) ◽  
pp. 511-521 ◽  
Author(s):  
Morelia Urlaub ◽  
Heinrich Villinger
Keyword(s):  
Slope Stability ◽  
Numerical Modelling ◽  
Transient Stability ◽  
Numerical Models ◽  
Failure Mechanisms ◽  
In Situ Monitoring ◽  
Physical Parameters ◽  
Submarine Landslides ◽  
Seafloor Deformation

AbstractThe stability of submarine slopes is often characterized using campaign-based geophysical and geotechnical measurements in combination with numerical modelling. However, such one-off measurements do not reflect transient changes in slope stability. In situ monitoring of physical parameters critical for slope stability over periods of months to years can provide crucial information on slope stability and can also be used in an early-warning system for submarine landslides and the possibly resulting tsunamis. We review existing techniques that are capable of monitoring seafloor deformation over long periods of time. Based on numerical models we can identify the magnitude of parameters related to landslide-induced seafloor deformation. Simulations of three different failure scenarios up to the point of failure show that the development of the stress state of a slope and hence stability over time can be captured by measurements of tilt, pressure and strain at the seafloor. We also find that different failure mechanisms induce different deformation signals at the seafloor, in particular tilt. Hence, with a site- and target-specific survey design (or a large pool of instruments), seafloor deformation measurements in combination with numerical modelling can be used to determine the temporal evolution of slope stability as well as to identify underlying failure mechanisms.

3D Simulation of Tunnel Collapse Consolidation and In Situ Monitoring Analysis

2011 ◽  
Vol 243-249 ◽  
pp. 3551-3555
Author(s):  
Zhi Min Chen ◽  
De An Zhao
Keyword(s):  
Numerical Models ◽  
Three Dimensional ◽  
In Situ Monitoring ◽  
3D Simulation ◽  
Actual Situation ◽  
Consolidation Effect ◽  
Tunnel Collapse ◽  
Simulation Results ◽  
Shallow Buried Tunnel

A shallow buried tunnel was collapsed during construction. According to the actual situation of the tunnel, different collapse consolidation schemes were put forward and corresponding three-dimensional finite difference numerical models were established and analyzed using FLAC3D software. Base on the 3D Simulation results, a collapse consolidation scheme was determined and constructed. The in-situ monitoring results of vault subsidence and convergence displacement were consistent approximately with the 3D Simulation results. The in-situ measured results were in line with the specification’s allowance and show that the consolidation effect of reinforced concrete casing arch and ahead grouting method is good. This could be referenced for similar engineering.

scholarly journals Comparison of high resolution hydrodynamic model outputs with in-situ Argo profiles in the Ionian Sea

2017 ◽  
Vol 18 (1) ◽  
pp. 22 ◽  
Author(s):  
D. KASSIS ◽  
G. KORRES ◽  
A. KONSTANTINIDOU ◽  
L. PERIVOLIOTIS
Keyword(s):  
High Resolution ◽  
Hydrodynamic Model ◽  
Numerical Models ◽  
Regional Scale ◽  
Model Performance ◽  
Temporal Analysis ◽  
In Situ Monitoring ◽  
Ionian Sea ◽  
Nested Models

In-situ monitoring is an essential component for the development of hydrodynamic numerical models. Argo expansion into marginal seas has enabled the advancement of high resolution regional nested models through initialization, assimilation and validation processes. The SANI (Southern Adriatic-Northern Ionian) hydrodynamic model is a regional nested model producing high resolution outputs for the period 2008-2012. For the corresponding time period, 21 free drifting Argo floats recorded Temperature –Salinity (T/S) profiles throughout the region. This study presents the inter-comparison of the two data sets whilst noting interesting aspects of the model performance regarding the representation of the major water masses characteristics of the SANI area. Aside from the inter-comparison in a basin’s scale, a spatio-temporal analysis is also performed. The results indicate an adequate response of the model simulations regarding the basic hydrographic features of the region. Nevertheless, important differences are highlighted mainly in the upper and deep layers of the study area. At a regional scale, inter-annual variability of the model’s performance is observed reflecting the hydrographic changes occurred in the wider area during the study period. Overall, the results present the strong points but also highlight the weaknesses of the model. They also confirm the challenging task of producing high resolution numerical simulations in transitional areas such as the Ionian Sea.

In Situ Monitoring Test for Rock Slope Stability in Li County Earthquake Zone of Sichuan Province

2012 ◽  
Vol 204-208 ◽  
pp. 2473-2477
Author(s):  
Jian Hua Liu
Keyword(s):  
Slope Stability ◽  
Rock Slope ◽  
Sichuan Province ◽  
In Situ Monitoring ◽  
Traffic Load ◽  
Seismic Load ◽  
Horizontal Deformation ◽  
Monitoring Test ◽  
Earthquake Zone

Combined with the highway from Lixian to Xiaojin, the in-situ monitoring test for Baozizui rock slope was carried out in Li County earthquake zone of Sichuan province, and three earthquakes whose magnitude exceeds 4.8 times had occurred during the monitoring period. According to monitoring results, the main conclusion was shown that the slope deformation attenuated and tended to be stable after two month of construction. Considered the anti-inclined structural face in the slope, the compacting deformation action, which was beneficial to slope stability. Moreover, seismic load had great influence on horizontal deformation of structural face in surface rock layer. And the reason was that there was regional stress bearing compression and shear in the nappe structures located on the thrust fault upper plate of this slope. The variation of horizontal deformation was frequent in earlier stage located at the road curve, in which there existed the traffic load, seismic excitation effects. And the later observational data indicated that the deformation has been basically stabilized.

Analysis on Foundation Excavation Side Slope Stability and Over-Break Depth of Embedded Pile Cap in HZM Bridge

2012 ◽  
Vol 256-259 ◽  
pp. 1697-1702
Author(s):  
Qi He Wu ◽  
Wei Tian ◽  
Zheng Zhong Qiu ◽  
Zhao Niu
Keyword(s):  
Slope Stability ◽  
Theoretical Calculation ◽  
In Situ Monitoring ◽  
Scale Model ◽  
Single Beam ◽  
Topographic Survey ◽  
Pile Cap ◽  
Monitoring Test ◽  
Calculation Analysis

In the paper, relying on the full-scale model test of embedded pile cap of the HZM Bridge, the method of combining the theoretical calculation analysis and in-situ monitoring test are used to study the slope stability and over-break depth of foundation excavation. In the theoretical calculation analysis, an empirical formula of the Hydtology of Sea-port is adopted for the over-break depth while the G-slope software is for the safety factor of slope stability; in the in-situ monitoring test, the single-beam is used for the topographic survey underwater at random after the foundation excavation. Analysising on the theoretical calculation analysis and the result of in-situ monitoring test, proper slope ratio and over-break depth of pile cap foundation excavation is put forward to provide key construction parameters for the main project of the HZM Bridge.

scholarly journals In situ monitoring and 3D geomechanical numerical modelling to evaluate seismic and aseismic rock deformation in response to deep mining

2020 ◽  
Vol 129 ◽  
pp. 104273 ◽  
Author(s):  
Francesca De Santis ◽  
Vincent Renaud ◽  
Yann Gunzburger ◽  
Jannes Kinscher ◽  
Pascal Bernard ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
In Situ Monitoring ◽  
Rock Deformation ◽  
Deep Mining

In situ monitoring of the groundwater field in an unsaturated pyroclastic slope for slope stability evaluation

Landslides ◽  
2014 ◽  
Vol 12 (2) ◽  
pp. 259-276 ◽  
Author(s):  
Marianna Pirone ◽  
Raffaele Papa ◽  
Marco Valerio Nicotera ◽  
Gianfranco Urciuoli
Keyword(s):  
Slope Stability ◽  
In Situ Monitoring ◽  
Stability Evaluation
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