scholarly journals Field measurements and monitoring for prevention of the labour accident by the slope failure under construction

2013 ◽  
Vol 8 (4) ◽  
pp. 597-610
Author(s):  
Kazuya ITOH ◽  
Katsuo SASAHARA ◽  
Hirofumi HAGA ◽  
Shin-ichi TOSA ◽  
Masahiro NAGUMO ◽  
...  
Keyword(s):  
Slope Failure ◽  
Field Measurements ◽  
Under Construction

Characteristics of Groundwater Response to Precipitation for Landslide Prevention at Kiyomizu-Dera

2017 ◽  
Vol 12 (5) ◽  
pp. 993-1001
Author(s):  
Toru Danjo ◽  
Tomohiro Ishizawa ◽  
Masamitsu Fujimoto ◽  
Naoki Sakai ◽  
Ryoichi Fukagawa ◽  
...  
Keyword(s):  
Groundwater Level ◽  
Heavy Rainfall ◽  
Slope Failure ◽  
Field Measurements ◽  
Scale Model ◽  
Slope Failures ◽  
Wet Season ◽  
Soil Failure ◽  
Groundwater Response ◽  
Typhoon Season

Every year in Japan, slope failures often occur due to heavy rainfall during the wet season and typhoon season. The main reasons for soil failure are thought to be the increase of soil weight from infiltrated precipitation, the decrease in shear strength, and effects of the increase groundwater elevation. It is therefore important to consider to characteristics of groundwater behavior to improve slope disaster prevention. Kiyomizu-dera experienced major slope failures in 1972, 1999, and 2013, and a large slope failure occurred nearby in 2015. The two most recent events occurred since observation of precipitation and groundwater conditions began at the site in 2004. In this research, we determine the relationship between rainfall and groundwater level using both a full-scale model experiment and field measurements. Results indicate strong connection between rainfall intensity and the velocity of increase in groundwater level, indicating that it is possible to predict changes in the groundwater level due to heavy rainfall.

Documentation of Surface Fault Rupture and Ground-Deformation Features Produced by the 4 and 5 July 2019 Mw 6.4 and Mw 7.1 Ridgecrest Earthquake Sequence

2020 ◽  
Vol 91 (5) ◽  
pp. 2942-2959 ◽  
Author(s):  
Daniel J. Ponti ◽  
James Luke Blair ◽  
Carla M. Rosa ◽  
Kate Thomas ◽  
Alexandra J. Pickering ◽  
...  
Keyword(s):  
Slope Failure ◽  
Ground Deformation ◽  
Field Measurements ◽  
Earthquake Hazard ◽  
Earthquake Sequence ◽  
Digital Data ◽  
Fault Rupture ◽  
Ground Failure ◽  
Eastern California Shear Zone ◽  
Deformation Features

Abstract The Mw 6.4 and Mw 7.1 Ridgecrest earthquake sequence occurred on 4 and 5 July 2019 within the eastern California shear zone of southern California. Both events produced extensive surface faulting and ground deformation within Indian Wells Valley and Searles Valley. In the weeks following the earthquakes, more than six dozen scientists from government, academia, and the private sector carefully documented the surface faulting and ground-deformation features. As of December 2019, we have compiled a total of more than 6000 ground observations; approximately 1500 of these simply note the presence or absence of fault rupture or ground failure, but the remainder include detailed descriptions and other documentation, including tens of thousands of photographs. More than 1100 of these observations also include quantitative field measurements of displacement sense and magnitude. These field observations were supplemented by mapping of fault rupture and ground-deformation features directly in the field as well as by interpreting the location and extent of surface faulting and ground deformation from optical imagery and geodetic image products. We identified greater than 68 km of fault rupture produced by both earthquakes as well as numerous sites of ground deformation resulting from liquefaction or slope failure. These observations comprise a dataset that is fundamental to understanding the processes that controlled this earthquake sequence and for improving earthquake hazard estimates in the region. This article documents the types of data collected during postearthquake field investigations, the compilation effort, and the digital data products resulting from these efforts.

Field measurements for identification of modal parameters for high-rise buildings under construction or in use

2021 ◽  
Vol 121 ◽  
pp. 103446
Author(s):  
Da Yo Yun ◽  
Doyoung Kim ◽  
Minsun Kim ◽  
Sang Geun Bae ◽  
Jae Woo Choi ◽  
...  
Keyword(s):  
Field Measurements ◽  
Modal Parameters ◽  
High Rise ◽  
Under Construction

scholarly journals Mode of Slope Failure of Moderately to Completely Weathered Metasedimentary Rock at Bukit Panji, Chendering, Kuala Terengganu

2015 ◽  
Vol 3 (2) ◽  
pp. 5-12
Author(s):  
Hamzah Hussin ◽  
Tajul Anuar Jamaluddin ◽  
Muhammad Fadzli Deraman
Keyword(s):  
Slope Failure ◽  
Regional Metamorphism ◽  
Development Project ◽  
Metasedimentary Rock ◽  
Residual Soil ◽  
Cut Slope ◽  
Modes Of Failure ◽  
Main Factors ◽  
Under Construction ◽  
Cut Slopes

Geology of Bukit Panji, Chendering, Kuala Teregganu consists of interbededmetasedimentary rocks (slate, phyllite and schists with minor quartzite) which haveexperience regional metamorphism. The age of this rock is Carboniferous. A development project which under construction in Bukit Panji, Kuala Terengganu hasenabled a landslide assessment to observe the modes of failure in moderately tocompletely weathered metasedimentary rock. Development on hillsides caused manyslope had to be cut to provide space for the infrastructure construction. From assessment analysis, a total of 21 cases of landslide failure occurred involving 17 cut slopes, and 4 cut-fill slopes. The most common type of failures is gully failures, with 9 cases represent 43% of all the observed slope failure. This was followed by 6 wedge failures, two planar and rock fall failures and one shallow sliding and toppling respectively. Cut slope failure involving moderate weathered rock mass (grade III) to the residual soil (grade VI). Relict structure was identified as the main factors controlling the failure, as well as water, natural slope-forming materials and the use of appropriate slope stabilization.

scholarly journals Strong Wind Characteristics and Buffeting Response of a Cable-Stayed Bridge under Construction

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1228 ◽  
Author(s):  
Lei Yan ◽  
Lei Ren ◽  
Xuhui He ◽  
Siying Lu ◽  
Hui Guo ◽  
...  
Keyword(s):  
Field Measurements ◽  
Element Model ◽  
Vertical Acceleration ◽  
Strong Wind ◽  
Buffeting Response ◽  
Cable Stayed Bridge ◽  
Wind Characteristics ◽  
Strong Winds ◽  
Under Construction ◽  
Turbulence Parameters

This study carries out a detailed full-scale investigation on the strong wind characteristics at a cable-stayed bridge site and associated buffeting response of the bridge structure during construction, using a field monitoring system. It is found that the wind turbulence parameters during the typhoon and monsoon conditions share a considerable amount of similarity, and they can be described as the input turbulence parameters for the current wind-induced vibration theory. While the longitudinal turbulence integral scales are consistent with those in regional structural codes, the turbulence intensities and gust factors are less than the recommended values. The wind spectra obtained via the field measurements can be well approximated by the von Karman spectra. For the buffeting response of the bridge under strong winds, its vertical acceleration responses at the extreme single-cantilever state are significantly larger than those in the horizontal direction and the increasing tendencies with mean wind velocities are also different from each other. The identified frequencies of the bridge are utilized to validate its finite element model (FEM), and these field-measurement acceleration results are compared with those from the FEM-based numerical buffeting analysis with measured turbulence parameters.

scholarly journals Suggestion of Measurement Management Criteria for Soil Slope Failure Based on Displacement

2021 ◽  
Vol 21 (1) ◽  
pp. 251-260
Author(s):  
Sun-Gyu Choi ◽  
Jae-Wook Suk ◽  
Hyang-Seon Jeong
Keyword(s):  
Literature Review ◽  
Field Data ◽  
Large Scale ◽  
Slope Failure ◽  
Small Scale ◽  
Soil Slope ◽  
Short Term ◽  
Literature Reviews ◽  
Under Construction

This paper describes the Measurement Management Criteria (MMC) of a soil slope failure based on displacement using literature reviews, small-scale experiments, large-scale experiments, and field data. Two types of measurement management criteria were developed, i.e., short-term criteria for slopes under construction or requiring urgent measurements, and long-term criteria for slopes under continuous management. First, the measurement criteria for the short term were determined based on small- and-large scale experiments, and were determined to be “1 mm/min for the watch level,” “4 mm/min for the caution level,” and “21 mm/min for the alert level.” Next, the criteria for the long term were determined through a literature review and field data, and were “2 mm/day for the watch level,” “8 mm/day for the caution level,” and “56 mm/day for the alert level”.

Dynamic analysis of a slope failure from the 6 August 1979 Coyote Lake, California, earthquake

1983 ◽  
Vol 73 (3) ◽  
pp. 863-877
Author(s):  
Raymond C. Wilson ◽  
David K. Keefer
Keyword(s):  
Material Properties ◽  
Slope Failure ◽  
Strong Motion ◽  
Field Measurements ◽  
Test Case ◽  
Strong Motion Records ◽  
Seismic Slope Stability ◽  
Seismically Induced Landslides ◽  
Rare Opportunity ◽  
Important Test

abstract The Coyote Lake, California, earthquake of 6 August 1979 (ML = 5.7) provided a rare opportunity to perform a dynamic numerical analysis of a seismically induced slope failure using actual strong-motion records. The earthquake displaced a preexisting slump on the northeast shore of Lake Anderson and formed a fissure 20 m long; offsets of 9 mm vertically and 18 mm horizontally were measured across the fissure. The slump is 9 km northwest of the located epicenter but within 100 m of the mapped trace of the Calaveras fault. Two strong-motion records were written in the vicinity of the slump: Coyote Creek, 5 km to the southeast, and Gilroy #6, 15 km to the southeast. These records combined with field measurements of the slope, estimates of the material properties, and a dynamic numerical model based on the Newmark analysis of seismic slope stability to calculate a predicted displacement for the landslide. A displacement of 27 mm, calculated using the N50°E component of the Gilroy #6 record, is in excellent agreement with the displacement measured in the field (21 mm). However, displacements of only 0.12 mm, calculated using the 250° component of the Coyote Creek strong-motion record, reflect significant local variations in seismic shaking intensity. Because strong-motion records and slope failures rarely coincide, this landslide provides an important test case for our understanding of the dynamics of seismically induced landslides, as well as a warning that local seismologic variations need to be considered in any design applications.

A Magnetic Spectrometer for a Scanning Transmission Electron Microscope

1974 ◽  
Vol 32 ◽  
pp. 436-437
Author(s):  
A. Kosiara ◽  
J. W. Wiggins ◽  
M. Beer
Keyword(s):  
Scanning Transmission Electron Microscope ◽  
Magnetic Spectrometer ◽  
Fringe Field ◽  
Curvature Radius ◽  
Magnetic Pole ◽  
Quadrupole Field ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Under Construction ◽  
Image Position

A magnetic spectrometer to be attached to the Johns Hopkins S. T. E. M. is under construction. Its main purpose will be to investigate electron interactions with biological molecules in the energy range of 40 KeV to 100 KeV. The spectrometer is of the type described by Kerwin and by Crewe Its magnetic pole boundary is given by the equationwhere R is the electron curvature radius. In our case, R = 15 cm. The electron beam will be deflected by an angle of 90°. The distance between the electron source and the pole boundary will be 30 cm. A linear fringe field will be generated by a quadrupole field arrangement. This is accomplished by a grounded mirror plate and a 45° taper of the magnetic pole.

Radiation Damage Studies with the HVEM

1972 ◽  
Vol 30 ◽  
pp. 680-681
Author(s):  
J. J. Laidler ◽  
B. Mastel
Keyword(s):  
Radiation Damage ◽  
Stainless Steels ◽  
Volume Expansion ◽  
Austenitic Stainless Steels ◽  
Test Facility ◽  
Fast Breeder Reactors ◽  
Breeder Reactors ◽  
Under Construction ◽  
Development Laboratory ◽  
Insight Into

One of the major materials problems encountered in the development of fast breeder reactors for commercial power generation is the phenomenon of swelling in core structural components and fuel cladding. This volume expansion, which is due to the retention of lattice vacancies by agglomeration into large polyhedral clusters (voids), may amount to ten percent or greater at goal fluences in some austenitic stainless steels. From a design standpoint, this is an undesirable situation, and it is necessary to obtain experimental confirmation that such excessive volume expansion will not occur in materials selected for core applications in the Fast Flux Test Facility, the prototypic LMFBR now under construction at the Hanford Engineering Development Laboratory (HEDL). The HEDL JEM-1000 1 MeV electron microscope is being used to provide an insight into trends of radiation damage accumulation in stainless steels, since it is possible to produce atom displacements at an accelerated rate with 1 MeV electrons, while the specimen is under continuous observation.

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