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

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.

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.204-208.2473 ◽

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.

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

Geological Society London Special Publications ◽

10.1144/sp477.8 ◽

2018 ◽

Vol 477 (1) ◽

pp. 511-521 ◽

Cited By ~ 3

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.

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