Construction Technology of Geogrid with Simplified Wrapped Face to Reinforce Swelling Rock Slope

2011 ◽  
Vol 261-263 ◽  
pp. 1690-1693
Author(s):  
Feng Yi Tan ◽  
Rong Hua Zou ◽  
Han Bing Hu ◽  
Zu Kai Lin
Keyword(s):  
Rock Slope ◽  
Layer By Layer ◽  
Construction Technology ◽  
In Situ Test ◽  
Whole Process ◽  
Test Region ◽  
North Water ◽  
Main Canal ◽  
Swelling Rock

The swelling rock slope reinforced by geogrid with wrapped face was one of reinforced methods in the swelling rock test region of main canal in South-to-North Water Division Project, the key step was the geogrid with wrapped face in layer by layer, which was not only the core step to make sure the reinforced swelling rock slope with geogrid as a integrality, but also the most complex, time consuming and cost in the whole process. From the in situ test, the construction technology and related construction parameters of geogrid of simplified face to reinforce the swelling rock slope was obtained, in which the construction of geogrid with wrapped face was optimized, the construction progress was improved and its cost was reduced, which contributed to the generalization and application of geogrid with simplified wrapped face to reinforce swelling rock slope in the middle-route of South-to-North Water Division Project, meanwhile, it was provided as a references for similar engineering.

Construction Technology of Treatment Measure of Swelling Rock Slope Replaced Backfilling Clay

2010 ◽  
Vol 168-170 ◽  
pp. 2334-2339
Author(s):  
Feng Yi Tan ◽  
Rong Hua Zou ◽  
Han Bing Hu ◽  
Zu Kai Lin
Keyword(s):  
Dry Density ◽  
Roller Compaction ◽  
Construction Technology ◽  
Optimal Thickness ◽  
Test Region ◽  
Before And After ◽  
Related Quality ◽  
Treatment Measures ◽  
North Water ◽  
Swelling Rock

Replaced backfilling clay is one of the treatment measures in the Luwangfen swelling rock test Region of middle-route of South-to-North Water Division Project. First, by using 18 tons vibration roller compaction mechanism, on the condition of 3 different thicknesss and 5 different compaction times, settlement, dry density, water content and permeability coefficient are studied before and after the compaction test to find out the optimal thickness and compaction times. Then, by using different compaction mechanisms, the compaction effect is studied on the condition of the optimal thickness and compaction times. Results show that the compaction degree of replaced backfilling clay is 100.0% on the condition that the quantity of vibration bumping roller is above 18 tons, thickness of replaced backfilling clay is no more than 35.0cm and at least it is compacted at least 12 times. Finally, the construction parameters of compaction and related quality controlling index is proposed, which is provided as a reference for design, mechanism’s choice, compaction parameter and quality control index.

Study on Construction Technology of Geogrid Treatment for Slope of Swelling Rock

2012 ◽  
Vol 238 ◽  
pp. 419-421
Author(s):  
Ying Gao ◽  
Ting Hua Zhao ◽  
Jie Bao
Keyword(s):  
Expansive Soil ◽  
Raw Material ◽  
Construction Technology ◽  
Middle Line ◽  
In Situ Experiment ◽  
Efficient Treatment ◽  
Project Construction ◽  
Channel Slope ◽  
Swelling Rock

Combined with the Luwangfen test section in the Middle Line of SNWT, the geosynthetic reinforcing technology which is an efficient treatment measure for channel slope in expansive soil region was studied by in-situ experiment. The raw material, operating sequences, standards and testing for construction were systematically researched and summarized. The results provide valuable reference for the similar project construction.

scholarly journals Experimental Research on the Properties of Rock-Filled Concrete

2019 ◽  
Vol 9 (18) ◽  
pp. 3767
Author(s):  
Hai Wei ◽  
Guohui Zhang ◽  
Fanfan Sun ◽  
Mingming Wang ◽  
Wenhai Li ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Interfacial Transition Zone ◽  
Rock Block ◽  
Construction Technology ◽  
Self Compacting Concrete ◽  
In Situ Test ◽  
Average Porosity ◽  
Permeability Rate

In order to comprehensively evaluate the properties of rock-filled concrete (RFC) with the strength of C15, lab experimental test and in-situ test are applied to explore the mechanical, hydraulic, ultrasonic characteristics of RFC in Hantang reservoir dam. Four types of defects within RFC are shown from the appearance of borehole cores specimens: (1) large sized voids existing in interfacial transition zone (ITZ) between self-compacting concrete (SCC) and rock block (RB); (2) bad cohesion in ITZ; (3) joints within rock block; (4) voids within SCC. For hydraulic aspects, the average porosity of RFC is 14.10%; the permeability rate of RFC ranges from 2.41 Lu to 10.41 Lu, with the average of 11.32 Lu, occasionally more than 25.52 Lu due to interconnected defects. For ultrasonic aspects, the ultrasonic velocity of RFC conforms to lognormal distribution, with the average of 2993.3 m/s and standard deviation of 650.5 m/s. For mechanical aspects, the average cubic compressive strength of RFC is 22.55 Mpa, with the standard deviation of 4.09 Mp. Thus the data shows a relatively great dispersion due to uneven distribution of some defects in RFC, which deteriorate the quality of RFC. Through the experimental investigation, it is shown that the quality of massive RFC in the Hantang dam is obviously non-homogeneous, mainly influenced by construction technology.

Epitaxial growth manner and structure of superconducting oxide films

1990 ◽  
Vol 48 (4) ◽  
pp. 2-3
Author(s):  
Yoshichika Bando ◽  
Takahito Terashima ◽  
Kenji Iijima ◽  
Kazunuki Yamamoto ◽  
Kazuto Hirata ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Film Surface ◽  
High Energy ◽  
Epitaxial Films ◽  
Layer By Layer ◽  
Initial Growth ◽  
In Situ Growth ◽  
High Quality ◽  
Activated Reactive Evaporation

The high quality thin films of high-Tc superconducting oxide are necessary for elucidating the superconducting mechanism and for device application. The recent trend in the preparation of high-Tc films has been toward “in-situ” growth of the superconducting phase at relatively low temperatures. The purpose of “in-situ” growth is to attain surface smoothness suitable for fabricating film devices but also to obtain high quality film. We present the investigation on the initial growth manner of YBCO by in-situ reflective high energy electron diffraction (RHEED) technique and on the structural and superconducting properties of the resulting ultrathin films below 100Å. The epitaxial films have been grown on (100) plane of MgO and SrTiO, heated below 650°C by activated reactive evaporation. The in-situ RHEED observation and the intensity measurement was carried out during deposition of YBCO on the substrate at 650°C. The deposition rate was 0.8Å/s. Fig. 1 shows the RHEED patterns at every stage of deposition of YBCO on MgO(100). All the patterns exhibit the sharp streaks, indicating that the film surface is atomically smooth and the growth manner is layer-by-layer.

Oblique-incidence Reflectivity Difference (OI-RD) and Leed Studies of Adsorption and Growth of Xe on Nb(110)

2003 ◽  
Vol 780 ◽  
Author(s):  
P. Thomas ◽  
E. Nabighian ◽  
M.C. Bartelt ◽  
C.Y. Fong ◽  
X.D. Zhu
Keyword(s):  
Transition Layer ◽  
Layer Growth ◽  
Flow Mode ◽  
Layer By Layer ◽  
Zeroth Order ◽  
Step Flow ◽  
Low Energy Electron Diffraction ◽  
Oriented Film ◽  
Low Energy Electron

AbstractWe studied adsorption, growth and desorption of Xe on Nb(110) using an in-situ obliqueincidence reflectivity difference (OI-RD) technique and low energy electron diffraction (LEED) from 32 K to 100 K. The results show that Xe grows a (111)-oriented film after a transition layer is formed on Nb(110). The transition layer consists of three layers. The first two layers are disordered with Xe-Xe separation significantly larger than the bulk value. The third monolayer forms a close packed (111) structure on top of the tensile-strained double layer and serves as a template for subsequent homoepitaxy. The adsorption of the first and the second layers are zeroth order with sticking coefficient close to one. Growth of the Xe(111) film on the transition layer proceeds in a step flow mode from 54K to 40K. At 40K, an incomplete layer-by-layer growth is observed while below 35K the growth proceeds in a multilayer mode.

scholarly journals Design and Application of an In Situ Test Device for Rheological Characteristic Measurements of Liquefied Submarine Sediments

2021 ◽  
Vol 9 (6) ◽  
pp. 639
Author(s):  
Hong Zhang ◽  
Xiaolei Liu ◽  
Anduo Chen ◽  
Weijia Li ◽  
Yang Lu ◽  
...  
Keyword(s):  
Yellow River ◽  
Rheological Characteristic ◽  
Yellow River Delta ◽  
Turbidity Currents ◽  
Rheological Characteristics ◽  
Submarine Landslides ◽  
Test Device ◽  
Offshore Area ◽  
In Situ Test

Liquefied submarine sediments can easily lead to submarine landslides and turbidity currents, and cause serious damage to offshore engineering facilities. Understanding the rheological characteristics of liquefied sediments is critical for improving our knowledge of the prevention of submarine geo-hazards and the evolution of submarine topography. In this study, an in situ test device was developed to measure the rheological properties of liquefied sediments. The test principle is the shear column theory. The device was tested in the subaqueous Yellow River delta, and the test results indicated that liquefied sediments can be regarded as “non-Newtonian fluids with shear thinning characteristics”. Furthermore, a laboratory rheological test was conducted as a contrast experiment to qualitatively verify the accuracy of the in situ test data. Through the comparison of experiments, it was proved that the use of the in situ device in this paper is suitable and reliable for the measurement of the rheological characteristics of liquefied submarine sediments. Considering the fact that liquefaction may occur in deeper water (>5 m), a work pattern for the device in the offshore area is given. This novel device provides a new way to test the undrained shear strength of liquefied sediments in submarine engineering.

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