The Dynamic Response Law of Bank Slope under Water-Rock Interaction

Zhang, Yinchai; Deng, Huafeng; Wang, Wei; Duan, Lingling; Zhi, Yongyan; Li, Jianlin

doi:10.1155/2018/1306575

Cited by 6 publications

(4 citation statements)

References 11 publications

(12 reference statements)

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“…Composed of mineral grains skeleton, pore, and cranny, rock is a typical kind of heterogeneous material. Under the effect of immersion-air dry circulation, rock structure of mineral grains and pores change continually, which affects its physical and mechanical property [21] erefore, the microstructure of rock samples was analyzed by SEM in different water-rock cycles as shown in Figure 12. And, the magnification diameter of SEM photos is 1200 scales of the original.…”

Section: Analysis Of Sandstone Microstructure Change Rule Under Watermentioning

confidence: 99%

Sandstone Dynamical Characteristics Influenced by Water-Rock Interaction of Bank Slope

Deng

Zhang

Zhi

et al. 2019

Advances in Civil Engineering

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During the long-term reservoir operation, the seismic capability and dynamic response characteristics of the bank slope are of great importance to its safety evaluation content. Aimed at typical bank slopes, considering reservoir water level fluctuation and soaking-air drying cyclic interaction, an experiment has been designed and conducted. In addition, the cyclic loading test with different stress amplitudes was carried out in different water-rock cycles. The laboratory results indicate that (1) during the immersion-air dry circulation process, the damping ratio and damping coefficient of sandstone gradually increased while the dynamic elastic modulus decreased. It is obvious that the dynamic elastic modulus of sandstone decreases dramatically during the immersion-air dry circulation process, especially in the first six periods. Also, its variation curve fits with the logarithmic curve. (2) When the cyclic load stress amplitude increases from 10 MPa to 35 MPa, the damping ratio and coefficient of the rock sample gradually decreased while dynamic elastic modulus increased. each dynamic parameter shows a more obvious variation trend when the stress amplitude is lower than 25 MPa. (3) During the water-rock interaction process, the closely knit microstructure of rock gradually becomes loose and porous, which resulted in the degradation of macroscopic physical and mechanical properties of sandstone. (4) In the analysis of the seismic response of the bank slope, the actual water-rock interaction process and the seismic level of the bank slope should be more considered. To find out further accurate reflection in the earthquake resistance and dynamic response of the bank slope, it is necessary to select the reasonable dynamic parameter to carry out seismic research.

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Section: Analysis Of Sandstone Microstructure Change Rule Under Watermentioning

confidence: 99%

Sandstone Dynamical Characteristics Influenced by Water-Rock Interaction of Bank Slope

Deng

Zhang

Zhi

et al. 2019

Advances in Civil Engineering

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“…Due to differences in topography, geomorphology and hydrological conditions, different waters of an open channel river have different hydrodynamic characteristics. Disaster-related problems encountered in real-life hydraulic engineering and river banks are often closely related to different hydrodynamic conditions [10][11][12][13][14][15]. For example, Zhang et al [10], based on the cyclic loading test considering reservoir water level fluctuation and soaking-air-drying cyclic water-rock interaction in different water-rock cycles, found that the dynamic characteristics of sandstone showed obvious degradation trend in the process of water-rock interaction.…”

Section: Introductionmentioning

confidence: 99%

“…Disaster-related problems encountered in real-life hydraulic engineering and river banks are often closely related to different hydrodynamic conditions [10][11][12][13][14][15]. For example, Zhang et al [10], based on the cyclic loading test considering reservoir water level fluctuation and soaking-air-drying cyclic water-rock interaction in different water-rock cycles, found that the dynamic characteristics of sandstone showed obvious degradation trend in the process of water-rock interaction. As the water-rock interaction period increased, the dynamic response of the slope hydro-fluctuation belt zone increased gradually, resulting in a direct influence on the long-term seismic performance of the bank slope.…”

Section: Introductionmentioning

confidence: 99%

Influence Mechanism of Different Flow Patterns on the Softening of Red-Bed Soft Rock

Liu

Zhou

2019

JMSE

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As a typical representative of red beds, the softening and disintegration of red sandstone when it encounters water is an important cause of initiated engineering disasters. However, research on the softening of this kind of rock has mainly focused on the still water–rock interaction. There is still a lack of quantitative analysis and a mechanistic explanation for the basic experimental study of dynamic water–rock interactions. Therefore, based on the independently developed multifunctional open channel hydraulic test equipment, the still water was used as the reference by designing the saturation test of red sandstone under two typical flow patterns—laminar flow and turbulent flow—and combined with a three-dimensional numerical simulation; specifically, the chemical, physical and mechanical effects of different flow patterns on the softening of red sandstone are discussed, and the mechanism of the influence of different flow patterns on the softening of red sandstone was further revealed. The results show that under different flow patterns, as the flow of water increased, the alkalinity of the circulating solution became stronger, the speed of stabilization of the ion concentration became faster, the development of the microscopic structure of the corresponding rock became higher and the decrease in mechanical strength became greater. The flow state affects the processes of rock softening and breaking by acting on the rock from the three aspects of chemistry, physics and mechanics. The study makes up for the deficiency of the quantitative analysis index of rock softening under dynamic water conditions and further improves the influence mechanism of different flow patterns on soft rock softening in red beds under dynamic water conditions. This research also provides a specific method for the protection of estuarine and coastal bank slopes with rich red-bed soft rock dissection under different flow patterns.

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“…It is a special engineering geological material widely distributed in slope engineering to form an SRM slope [1][2][3]. The SRM slope is exposed to the field and has long been affected by rainwater seepage, geological force, slope sliding force and human activities, resulting in differences in mechanical properties of SRM distributed in different spatial locations [4][5].…”

Section: Introductionmentioning

confidence: 99%

Study on Spatial Variation of Shear Mechanical Properties of Soil-rock Mixture

Wang¹,

Li²,

Qiao³

et al. 2019

Period. Polytech. Civil Eng.

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The soil-rock mixture (SRM) is a kind of special engineering geological material, which has been exposed to the field for a long time and is affected by rainwater seepage, geological force, slope sliding force and human activities, resulting in the spatial variability of its mechanical properties. Taking the SRM distributed on a slope of the Three Gorges Reservoir area as the research object, four test locations were selected along and transverse the slope. First, in-situ large-scale direct shear test was carried out, and then the laboratory large-scale direct shear test, particle sieving test, and water content test were carried out in the undisturbed sample to study the variation of shear mechanical properties of SRM distributed in different spatial locations. The results show that: (1) Under the same normal stress, the peak strength of the SRM decreases at a similar rate along the slope direction and the transverse slope direction. (2) The cohesion of the SRM is continuously strengthened, and the friction angle is continuously deteriorated along the slope from high to low, the cohesion and friction angle are almost no variability along the transverse slope. (3) The mechanism of the above-mentioned variation in the shear mechanics parameters of SRM is that the lower the elevation along the slope, the more fragmented the rock, the lower the rock content. (4) Spatial variability models of cohesion and friction angle of SRM were established, which can provide references for related engineering applications.

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The Dynamic Response Law of Bank Slope under Water-Rock Interaction

Cited by 6 publications

References 11 publications

Sandstone Dynamical Characteristics Influenced by Water-Rock Interaction of Bank Slope

Sandstone Dynamical Characteristics Influenced by Water-Rock Interaction of Bank Slope

Influence Mechanism of Different Flow Patterns on the Softening of Red-Bed Soft Rock

Study on Spatial Variation of Shear Mechanical Properties of Soil-rock Mixture

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