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.

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.

scholarly journals Fatigue Assessment on Suspenders under Stochastic Wind and Traffic Loads Based on In-Situ Monitoring Data

2019 ◽  
Vol 9 (16) ◽  
pp. 3405 ◽  
Author(s):  
Mengxue Wu ◽  
Jin Zhu ◽  
Junlin Heng ◽  
Sakdirat Kaewunruen
Keyword(s):  
Fatigue Damage ◽  
Life Time ◽  
Suspension Bridge ◽  
In Situ Monitoring ◽  
Traffic Load ◽  
Monitoring Data ◽  
Fatigue Reliability ◽  
Fatigue Assessment ◽  
Traffic Loads

As a critical component of a suspension bridge, the integrity of the suspenders plays a critical role in the serviceability and reliability of the bridge during its life time. Despite the wide recognition of the importance of the suspenders, very few studies have been devoted to the condition evaluation of suspenders in operation. The present study performs the fatigue assessment on the suspenders accounting for the stochastic wind and traffic loads using the in-situ monitoring data. To this end, a probabilistic numerical framework is proposed to predict the time-dependent fatigue reliability of the suspenders under stochastic wind and traffic loads during the bridge’s life time, based on the linear fatigue damage rule. As a demonstration, the proposed numerical framework is applied to a long-span suspension bridge located in a mountainous canyon. The results indicate that it is of paramount importance to consider both the wind and traffic load effects in the fatigue reliability evaluation of the suspenders. In addition, it was also found that among the suspenders under investigation, the short suspender at the bridge mid-span (S36) is more prone to the fatigue damage, while the long suspender at the end of the bridge girder (S2) is less prone to the fatigue damage. Finally, provided with a target reliability index of 3.0, the fatigue life of the suspenders S36 and S2, considering the life time wind and traffic load, is estimated as 53 years and 167 years, respectively. The present research could provide essential guidelines for the optimization of inspection and replacement in maintenance practices for suspenders.

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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