Analysis of deformation characteristics for a reservoir landslide before and after impoundment by multiple D-InSAR observations at Jinshajiang River, China

Tungsten inert gas arc (TIG) process was employed to remelt Fe-based coating deposited by plasma spraying. Subsequently, the microstructure, interface, and the wear resistance of the coatings before and after remelting were studied. The results showed that the lamellar structure, pores, and inclusions of Fe-based coating were eliminated and the porosity significantly decreased from 4% to 0.4%. The as-sprayed coating contained microcrystalline region, nanocrystalline region, and transition region, while single crystal region and rod-shaped (Fe,Cr)23C6 were observed in the remelted coating. There was no element diffusion and dissolution phenomenon at the interface; thus, the bonding form between the as-sprayed coating and substrate mainly was mechanical bonding. On the contrary, the diffusion transfer belt (DTB) emerged at the interface of the remelted coating and substrate, the remelted coating was bonded with the substrate metallurgically. Additionally, the average microhardness and elastic modulus of the remelted coating increased by 33.4% and 53.2%, respectively, compared with the as-sprayed coating. During wear process, the as-sprayed coating exhibited obvious brittle fracture characteristics, while the remelted coating appeared typical plastic deformation characteristics and its weight loss reduced by 39.5%. Therefore, TIG remelting process significantly improved the microstructure, mechanical properties, and wear resistance of Fe-based coating.

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2D14 Eyeball Deformation Characteristics during Air Jet Application Before and After the Vitreous Surgery

The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME ◽

10.1299/jsmebio.2014.26.395 ◽

2014 ◽

Vol 2014.26 (0) ◽

pp. 395-396

Author(s):

Shohei UEMURA ◽

Makoto KANEKO ◽

Naoko AIZAWA ◽

Yuji TANAKA ◽

Hiroshi KUNIKATA ◽

...

Keyword(s):

Deformation Characteristics ◽

Vitreous Surgery ◽

Air Jet ◽

Before And After

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Study on Deformation Characteristics and Mechanism of Q3 Loess Microstructrue Before and After Wetting

10.21203/rs.3.rs-127353/v1 ◽

2020 ◽

Author(s):

Xiaojun YIN ◽

Lanmin WANG

Keyword(s):

Ct Scanning ◽

Structure Type ◽

Chemical Components ◽

Deformation Characteristics ◽

Particle Structure ◽

Test Analysis ◽

Before And After ◽

Sample Test ◽

Conduction Zone ◽

Physical And Mechanical Characteristics

Abstract Microstructure characteristics of loess is an effective way to study the physical and mechanical characteristics of soil under different conditions. Water content in sample of Q3 loess is about 25% ,which was first subjected to X-Ray test to determine the main chemical components in loess and calculated the proportion in the sample. Test analysis shows the particle structure of the loess belonged to the granular structure type. CT scanning tests were performed on the sample before and after wetting. The changes of total number of pores, the maximum pore volume and the position of the centroid of pore of the sample were analyzed before and after wetting. The results shows that the soluble salts of loess have been dissolved after wetting.The volume of the pores of loess have been changed. Some increased, some decreased and others closed in volume. The change of the number of pores indicates that the sample formed obvious saturated zone, transition zone, conduction zone and humid zones after wetting. These results reveals the deformation characteristics and mechanism of Q3 loess microstructure.

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Macro and micro analysis on deformation characteristics of fine sand under different groundwater table change

E3S Web of Conferences ◽

10.1051/e3sconf/202123601037 ◽

2021 ◽

Vol 236 ◽

pp. 01037

Author(s):

Tianrong Huang ◽

Yaoru Lu ◽

Xuefeng Wang ◽

Qiushi Fu ◽

Yu Wang ◽

...

Keyword(s):

Fine Sand ◽

Relative Displacement ◽

Sem Analysis ◽

Groundwater Table ◽

Deformation Characteristics ◽

Creep Tests ◽

Indirect Contact ◽

Effective Force ◽

Before And After ◽

Micro Analysis

By using the samples of fine sand in Shanghai’s seventh layer, creep tests were performed to investigate the deformation characteristics of fine sand under different groundwater table change. It was revealed that the creep of fine sand is closely related to groundwater table change: when the effective force caused by groundwater table change is smaller than pre-consolidation force, the deformation is mainly elastic. When effective force caused by groundwater table change is bigger than pre-consolidation force, the compression deformation is large and the rebound is small; and the deformation is mainly viscoelastic plastic when equal to pre-consolidation stress. Through the scanning electron microscope (SEM) analysis it was found that creep of fine sand is dominated by the slip of particles, not by the breaking of particles. And the fine sand particles are squeezed under the load induced by the groundwater table change, and the particles slide along the indirect contact surface of the particles, resulting in the continuous adjustment of position and relative displacement. Mercury injection test shows that the pore size distribution of fine sand has little change before and after the test.

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Research on Pre-Load Treatment of Broadened Highway Subgrade

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.736.89 ◽

2015 ◽

Vol 736 ◽

pp. 89-96

Author(s):

Bao Lin Zhu ◽

Tong Wang ◽

Yang Zhao Shi ◽

Dao Xin Wei ◽

Jing Chen

Keyword(s):

Numerical Simulation ◽

Differential Settlement ◽

Control Methods ◽

Deformation Characteristics ◽

Construction Process ◽

The Road ◽

Deformation Law ◽

Before And After ◽

And Control

This paper determines deformation law of the new and old subgrade differential settlement by studying on subgrade deformation characteristics and control methods, mainly by using the method of numerical simulation under certain conditions. By comparing the subgrade differential settlement before and after preloading, it is confirmed that preloading treatment can be used to prevent the road structure from the effect of differential settlement during and after highway widening construction process.

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Analysis of Deformation Characteristics of Filled Subgrade Treated by Micro-Pile

Advances in Civil Engineering ◽

10.1155/2021/5755796 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Xuhe Gao ◽

Weiping Tian ◽

Jiachun Li ◽

Hongliang Qi ◽

Zhipei Zhang

Keyword(s):

Life Cycle ◽

Calculation Model ◽

Deformation Characteristics ◽

Stress Monitoring ◽

Highway Engineering ◽

Deformation Control ◽

Deviation Rate ◽

Before And After ◽

Stress And Deformation ◽

Whole Life Cycle

Deformation control of fill subgrade is a difficult point in the field of highway engineering. This article relies on the treatment project of micro-piles for subgrade deformation of K555 + 070～K557 + 710 section of Qingdao-Yinchuan Expressway. Settlement and stress monitoring was carried out at the toe of the roadbed, the shoulder, and the center of the roadbed. We use Midas/GTS modeling trial calculation. A new method to check the simulation results of the deviation rate is proposed. A calculation model of the stress and deformation of the subgrade in the whole life cycle is established. The results of comparative analysis, monitoring, and simulation are as follows. ① The compression and consolidation of the fill account for most of the settlement and deformation of the roadbed in the whole life cycle. ② Subgrade center settlement is the sensitive part of subgrade deformation. ③ After piles are added, the deformation extremes at the toe of the slope, the shoulder, and the center of the roadbed are all reduced by more than 96%. The research results can provide theoretical guidance for the analysis of the stress and deformation characteristics of the subgrade before and after the micro-pile treatment.

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Deformation Replication

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100068394 ◽

1970 ◽

Vol 28 ◽

pp. 280-281

Author(s):

J. Temple Black

Keyword(s):

Cutting Speed ◽

Machining Process ◽

Depth Of Cut ◽

Rake Face ◽

Orthogonal Machining ◽

Aluminum Chips ◽

Before And After ◽

Materials Used ◽

Glass Knife ◽

Very High

Tool materials used in ultramicrotomy are glass, developed by Latta and Hartmann (1) and diamond, introduced by Fernandez-Moran (2). While diamonds produce more good sections per knife edge than glass, they are expensive; require careful mounting and handling; and are time consuming to clean before and after usage, purchase from vendors (3-6 months waiting time), and regrind. Glass offers an easily accessible, inexpensive material ($0.04 per knife) with very high compressive strength (3) that can be employed in microtomy of metals (4) as well as biological materials. When the orthogonal machining process is being studied, glass offers additional advantages. Sections of metal or plastic can be dried down on the rake face, coated with Au-Pd, and examined directly in the SEM with no additional handling (5). Figure 1 shows aluminum chips microtomed with a 75° glass knife at a cutting speed of 1 mm/sec with a depth of cut of 1000 Å lying on the rake face of the knife.

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