Stability analysis of a typical landslide mass in the Three Gorges Reservoir under varying reservoir water levels

Zhang, Yonggang; Zhang, Zhen; Xue, Song; Wang, Ruijie; Xiao, Mao

doi:10.1007/s12665-019-8779-x

Cited by 145 publications

(78 citation statements)

References 24 publications

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“…Thus, it is necessary to carry out the research on the seismic behavior of frost-damaged squat RC shear walls due to the degradation of bond strength in the following research. For concrete without an air-entraining agent, the air content is about 1-2% [10,47]. Thus, the conclusion of this paper can provide theoretical guidance for in-service squat concrete shear walls with air content not exceeding 2%.…”

Section: Discussion On Test Limitation and Further Researchmentioning

confidence: 70%

Seismic behavior of frost-damaged squat RC shear walls under artificial climate environment: a further experimental research

Rong

Zheng

Zhang

et al. 2020

Archiv.Civ.Mech.Eng

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In cold environment, the damage of freezing and thawing poses a great threat to the safety of concrete structures. In this study, six frost-damaged squat reinforced concrete (RC) shear walls were subjected to low cyclic reversal loading to investigate the effects of axial compression ratio, concrete strength and freeze-thaw cycles (FTCs) on the seismic performance of squat RC shear walls. The seismic behavior of the test specimens was evaluated in terms of the frost action at the microstructure level, frost-heave crack patterns, damage processes, failure patterns, hysteretic behaviors, skeleton curves, deformations, and energy dissipation capacities. It shows that the boundary elements and distributed reinforcements had obvious restraining effects on the development of frost-heave cracks. The FTC action weakened the load-carrying capacity, energy dissipation capacity, and shear resistance capacity of the walls. When the number of FTCs is kept at 200, with the increase of the concrete strength, the gel structure (C-S-H) gradually evolved from fibrous to nets, also the width and number of frost-heave cracks started to reduce, and the distribution of frost-heave cracks evolved from the middle of the specimen to the perimeter. Moreover, the energy dissipation capacity and the ratio of the shear displacement on the whole displacement after cracking loading condition started to increase.

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Section: Discussion On Test Limitation and Further Researchmentioning

confidence: 70%

Seismic behavior of frost-damaged squat RC shear walls under artificial climate environment: a further experimental research

Rong

Zheng

Zhang

et al. 2020

Archiv.Civ.Mech.Eng

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“…The rock sample in this test is granite, which has a relatively high compressive strength [43]. The two processes of A and B are designed in the test to provide better observations of the change in fracture surface strain under the uniaxial condition.…”

Section: Analysis Of the Deformation Process Of The Rock Samplementioning

confidence: 99%

Study on Strain Characterization and Failure Location of Rock Fracture Process Using Distributed Optical Fiber under Uniaxial Compression

Wang

Zhang

et al. 2020

Sensors

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A rock fracture test is a very important method in the study of rock mechanics. Based on the Mechanics Test System (MTS) mechanical test system, the dynamic strain response of the failure process of cylindrical granite specimens under uniaxial compression was observed by using distributed optical fiber strain sensors. Two groups of tests were designed and studied for rock sample fracturing. The main comparison and analysis were made between the distributed optical fiber testing technology and the MTS testing system in terms of the circumferential strain response curve and the evolution characteristics of strain with time. The strain characterization of distributed optical fiber in the process of rock fracturing was obtained. The results show that the ring strains measured by the distributed optical fiber sensor and the circumferential strain gauge were consistent, with a minimum ring strain error of 1.27%. The relationship between the strain jump or gradient band of the distributed optical fiber and the crack space on the sample surface is clear, which can reasonably determine the time of crack initiation and propagation, point out the location of the rock failure area, and provide precursory information about rock fracture. The distributed optical fiber strain sensor can realize the linear and continuous measurement of rock mass deformation, which can provide some reference for the study of macro damage evolution and the fracture instability prediction of field engineering rock mass.

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“…Due to its excellent pavement performance, asphalt pavement has become the mainstream paving form in long tunnels [ 1 , 2 , 3 ]. However, asphalt, as a kind of flammable material, is easy to be decomposed under heat in tunnel fire and produces flammable gas and toxic fumes, which further promote fire spread and hinder fire rescue and escape [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Research on the Flame Retardancy Properties and Mechanism of Modified Asphalt with Halloysite Nanotubes and Conventional Flame Retardant

Tan

et al. 2020

Materials

Self Cite

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The inflammability of asphalt road will promote fire spread in the tunnel and produce lots of toxic smoke. To improve the fire resistance of asphalt pavement, mineral powder flame retardants are generally replaced by flame retardants in equal amounts. In this study, the effects of the synergistic flame retardancy system of halloysite nanotubes (HNTs) and conventional flame retardants (CFR) on the flame retardancy performance and mechanism of asphalt were investigated. Firstly, the flame retardancy properties of the HNTs and CFR composite modified asphalt were investigated based on the Cleveland open cup method (COC), Limiting oxygen index meter (LOI), and Cone calorimeter tests (CCTs). Then, the flame retardancy mechanism of the modified asphalt was studied based on Thermogravimetric analyzer (TGA), Fourier-transform infrared (FTIR), and Scanning electron microscopy (SEM). The results show that adding HNTs could improve the flame retardancy of the CFR modified asphalt binder. When 1 wt % HNTs and 8 wt % CFR were used, the limiting oxygen index of asphalt increased by 40.1%, the ignition temperature increased by 40 °C, while the heat release rate, total heat release, the smoke production rate, total smoke release, and other parameters decreased with varying degrees. Based on TG, FTIR, and SEM, the targeted flame retardancy mechanism and synergistic effect of HNTs/CFR flame retardancy system were revealed and summarized as three stages: (1) Stage 1, aluminum hydroxide (ATH) absorbs heat through thermal decomposition and inhibits the decomposition of lightweight components in asphalt; (2) Stage 2, aluminum diethyl phosphate (ADP) decomposes and produces organic phosphoric acid, which catalyzes crosslinking and ring thickening of asphalt and the quenching effect of phosphorus free radicals to block the combustion; and (3) Stage 3, HNTs plays an important role in increasing the integrity and density of the barrier layer. In addition, the Al2O3 produced by the decomposition of ATH, the carbon layer formed by the ADP catalyzed pitch, and HNTs play a significant synergistic effect in the formation of the barrier layer. Thus, the combination of HNTs and CFR has been proved to be a prospective flame retardancy system for asphalt.

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Stability analysis of a typical landslide mass in the Three Gorges Reservoir under varying reservoir water levels

Cited by 145 publications

References 24 publications

Seismic behavior of frost-damaged squat RC shear walls under artificial climate environment: a further experimental research

Seismic behavior of frost-damaged squat RC shear walls under artificial climate environment: a further experimental research

Study on Strain Characterization and Failure Location of Rock Fracture Process Using Distributed Optical Fiber under Uniaxial Compression

Research on the Flame Retardancy Properties and Mechanism of Modified Asphalt with Halloysite Nanotubes and Conventional Flame Retardant

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