scholarly journals A centrifugal model test of microbial carbonate precipitation as liquefaction countermeasure

2011 ◽  
Vol 6 (2) ◽  
pp. 157-167 ◽  
Author(s):  
Yukiko INAGAKI ◽  
Masayoshi TSUKAMOTO ◽  
Hirotoshi MORI ◽  
Susumu NAKAJIMA ◽  
Tetsuya SASAKI ◽  
...  
Keyword(s):  
Model Test ◽  
Carbonate Precipitation ◽  
Centrifugal Model Test ◽  
Microbial Carbonate ◽  
Microbial Carbonate Precipitation ◽  
Centrifugal Model

Centrifugal model test of post-grouting pile group in loess area

2021 ◽  
Vol 151 ◽  
pp. 106985
Author(s):  
Zhijun Zhou ◽  
Kangchao Wang ◽  
Hongming Feng ◽  
Yeqing Tian ◽  
Shanshan Zhu
Keyword(s):  
Model Test ◽  
Pile Group ◽  
Centrifugal Model Test ◽  
Loess Area ◽  
Post Grouting ◽  
Centrifugal Model

Using microbial carbonate precipitation to improve the properties of recycled aggregate

2019 ◽  
Vol 228 ◽  
pp. 116743 ◽  
Author(s):  
Weilai Zeng ◽  
Yuxi Zhao ◽  
Chi Sun Poon ◽  
Zhangyao Feng ◽  
Zhenmei Lu ◽  
...  
Keyword(s):  
Recycled Aggregate ◽  
Carbonate Precipitation ◽  
Microbial Carbonate ◽  
Microbial Carbonate Precipitation

Settlement and Deformation Laws of High Loess-Filled Embankment Based on Centrifugal Model Test

2011 ◽  
Vol 90-93 ◽  
pp. 222-229
Author(s):  
Wei Bing Zhang ◽  
Lian Tang
Keyword(s):  
Model Test ◽  
Spatial Effect ◽  
Slope Ratio ◽  
Actual Measurement ◽  
Construction Period ◽  
Centrifugal Model Test ◽  
Lateral Extrusion ◽  
Distribution Laws ◽  
The Stability ◽  
Centrifugal Model

In view of the settlement problem of high loess-filled embankments themselves, with the reference of the 30m high embankment at K5 +536 of Lan Lin provincial expressway and by means of the centrifugal model test, the developing process of the settlement for embankment itself with time in different sections of embankment and the distribution laws of the settlement subjected from spatial effect in case of the different terrain conditions are studied. Compared with the actual measurement, the results show that: as far as the settlement of high-filled embankment itself is concerned, the settlement at the central part along the cross-section of embankment is larger than that at shoulder; When the stability of embankment is relatively poor because of the bigger slope ratio or faster speed of construction, the settlement at the shoulder caused by the lateral extrusion from the edge of embankment is larger; The settlement of embankment itself is approximately 0.5% -1% of the height of embankment, about 75% -85% of which occurred during the construction period and the remaining 15% -25% belongs to after construction. Furthermore, the 85% of the settlement belong to after construction will be completed within a year and about two years later the settlement tend to be stable; Owing to the affection of the spatial effect due to the valley terrain conditions, the settlement near the joint sites between the embankment and the gully is larger than that occurred in gentle slope and the central part of embankment. During the time of designing and construction for high-filled embankment, the location where the settlement influenced by the lateral extrusion and spatial effect should be paid attention to, so that, the security and stability of the embankment could be ensured.

scholarly journals Sand Solidification through Microbially Induced Carbonate Precipitation for Erosion Control: Prospects in Bangladesh

2016 ◽  
Vol 9 (1) ◽  
pp. 59-61
Author(s):  
MNH Khan ◽  
S Kawasaki ◽  
MR Hassan
Keyword(s):  
Erosion Control ◽  
Precipitation Method ◽  
Carbonate Precipitation ◽  
Stiffness Properties ◽  
Microbial Carbonate ◽  
Microbial Carbonate Precipitation ◽  
Microbially Induced Carbonate Precipitation ◽  
Strength And Stiffness ◽  
Ureolytic Bacteria

Bio-cementation is a sand consolidation technology, in which ureolytic bacteria release carbonate from urea hydrolysis in the presence of an excess of calcium ions to form calcite (CaCO3) in-situ. Biocementation is to enhance the strength and stiffness properties of soil and rocks though microbial activity or products. This paper addressed the prospect of microbial carbonate precipitation for erosion control in Bangladesh. Bacterial CaCO3 precipitation under appropriate conditions is a general phenomenon where the ureolytic bacteria uses urea as an energy source and produces ammonia which increases the pH in the environment and generates carbonate, causing Ca2+ and CO32- to be precipitated as CaCO3. This CaCO3 join sand particles and forms rocklike materials that auto-repairs by means of sunlight, seawater, and bacteria as microbially induced carbonate precipitation method. These rock particles when produced artificially is called artificial rock and has the potentiality to protect coastlines from erosion.J. Environ. Sci. & Natural Resources, 9(1): 59-61 2016

scholarly journals Research on Application of Multi-Channel Selector in Centrifugal Model Test of Anchoring Slope by Frame Beam

2021 ◽  
Vol 9 ◽  
Author(s):  
Junhui Zhang ◽  
Feng Li ◽  
Shiping Zhang ◽  
Jiankun Zhou ◽  
Houming Wu
Keyword(s):  
Model Test ◽  
Effective Means ◽  
Acquisition System ◽  
Centrifugal Model Test ◽  
Geotechnical Centrifuge ◽  
Alpine Regions ◽  
Sensor Signals ◽  
One To One ◽  
Centrifugal Model ◽  
Centrifugal Test

An anchoring frame beam is a very common form of support for reinforced slopes, especially in alpine regions. Centrifugal tests have proved to be an intuitive and effective means of investigating the mechanism of action of frame beams. However, the data acquisition system of the geotechnical centrifuge in service has the problem of a small number of acquisition channels. A multi-channel selector based on the existing acquisition system was proposed, designed, processed, and manufactured, and it was debugged, tested, and applied in a no-load centrifugal test, static pressure model test, and centrifugal model test. The results show that the acquisition mode of the multi-channel selector connected with a maximum of 288 sensors has been changed from “one-to-one” to “one-to-many”. Its influence on various sensor signals is negligible. The multi-channel selector can work normally, which communicates and feeds back with the remote controller in the 1–120 g no-load centrifugal test. In the static load model test, 162 sensor signals were well collected through it. And only 51 channels were used to effectively obtain the signals of 187 sensors in a 70 g centrifugal model test of an anchoring slope with a frame beam. The multi-channel selector can be successfully applied in different use environments, saving time and reducing the cost of obtaining a single set of data.

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