Large-scale rockfall impact experiments on a RC rock-shed with a newly proposed cushion layer composed of sand and EPE

Zhao, Peng; Xie, Lingzhi; Li, Liangpu; Liu, Quan; Yuan, Song

doi:10.1016/j.engstruct.2018.08.046

Cited by 42 publications

(18 citation statements)

References 15 publications

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“…Although a prototype experiment can reveal the real physical process, it is typically destructive. Hence, it is uneconomical and requires a special technology [2]. In addition, there is no standard for the size of the actual rockfall-resistant structure, and it should be judged according to a designer's experience or site conditions.…”

Section: Methodsmentioning

confidence: 99%

“…Typically, natural rockfalls have different shapes. In the existing literature, rockfall models of various shapes were used for impact testing and analysis, with the most typical ones being spherical [28][29][30], polyhedral [2], cubic [7,31], and oval [32]. In our experiments, the material used to simulate the rockfalls was obtained by pouring concrete into steel molds.…”

Section: Methodsmentioning

confidence: 99%

“…Rockfalls are one of the most common geological hazards in mountainous areas [1,2]. Due to their unpredictability and high-energy dynamic characteristics, rockfalls pose a huge threat to roads and infrastructure.…”

Section: Introductionmentioning

confidence: 99%

“…Gerber et al [20] proposed foam glass and carried out large tests and a theoretical analysis; the results confirmed the excellent energy dissipating effect of the cushion layer. Zhao et al [2] studied the cushioning effect of different combinations of steel shed-rock and sand, EPE, and expanded polystyrene (EPS) based on model tests. Gao et al [21] studied the cushioning characteristics of foamed aluminum on reinforced-concrete (RC) slabs under explosive loading.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Impact Response of RC Slabs with a Sandy Soil Cushion Layer

Zhou

et al. 2021

Advances in Civil Engineering

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The impact response of reinforced-concrete (RC) slabs covered with a sandy soil cushion layer was investigated using an outdoor rockfall impact test platform. Impact tests were carried out by releasing rockfalls with different weights from different heights to impact a combined structure. Test data included the acceleration duration curve of the rockfall, strain of the concrete slab at multiple measuring points, and midpoint displacement duration curve of the slab. The test results showed an exponential relationship between the impact force acting on the cushion layer surface and cushion layer thickness. An empirical formula was used to calculate the maximum penetration, and the result was in good agreement with the test value. In addition, the attenuation rate of the impact force acting on the cushion layer increased exponentially with the increase in the cushion layer thickness, and the peak impact force could be attenuated by approximately 70% at a thickness of 0.6 m. Finally, the failure process and failure modes of the RC slabs were investigated.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Impact Response of RC Slabs with a Sandy Soil Cushion Layer

Zhou

et al. 2021

Advances in Civil Engineering

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“…In addition to concrete dams and flexible barriers, rock shed is a useful protection measure, and it has been widely used at tunnel entrances of highways and railways in high-risk regions. Cushion layers (Figure 1(a)), usually composed of sand or soil, are commonly placed on the top of a rock shed to reduce the impact force and dissipate energy [1][2][3][4][5][6][7][8][9]. However, traditional cushion layers have several disadvantages, such as heavy weight, poor buffering performance, easy accumulation, and difficult maintenance and clean up [2,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Full‐Scale Impact Test and Numerical Simulation of a New‐Type Resilient Rock‐Shed Flexible Buffer Structure

Zhao

Guo

et al. 2019

Shock and Vibration

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Rock sheds have been widely used to protect against rockfall. Traditionally, a cushion layer is placed on the top of a rock shed to reduce the impact force and dissipate energy. However, heavy cushion layers lead to high dead loads and increased construction costs. This paper discusses the concept of an impact-resilient flexible buffer structure. On the basis of that concept, it also proposes a buffer structure mainly composed of springs, ring nets, spring rods, and support ropes, which can be used to replace the traditional cushion layer on a shed for rockfall protection. Full-scale impact tests were conducted to study the impact-resilient characteristic of the structure combined with numerical simulation. The dynamic responses of the buffer structure, including force, deformation, and energy dissipation, were analysed in depth. Finally, parametric numerical simulations of 33 models were conducted; the spring stiffness of these models ranged from 300 kN/m to 1500 kN/m; the impact energy ranged from 100 kJ to 2000 kJ. Moreover, simple approaches for estimating the impact force and braking distance of the buffer structure were proposed and verified using measured data obtained from the impact test.

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Rockfall Hazard: A Comprehensive Review of Current Mitigation Practices

Maheshwari

Bhowmik

Samanta

2023

Landslides: Detection, Prediction and Monitoring

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Large-scale rockfall impact experiments on a RC rock-shed with a newly proposed cushion layer composed of sand and EPE

Cited by 42 publications

References 15 publications

Experimental Investigation of Impact Response of RC Slabs with a Sandy Soil Cushion Layer

Experimental Investigation of Impact Response of RC Slabs with a Sandy Soil Cushion Layer

Full‐Scale Impact Test and Numerical Simulation of a New‐Type Resilient Rock‐Shed Flexible Buffer Structure

Rockfall Hazard: A Comprehensive Review of Current Mitigation Practices

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