Performance of Used Tire Cushion Layer under Rockfall Impact

Sun, Jin; Chu, Zhaojun; Liu, Yingfang; Luo, Weiming; Wang, Min

doi:10.1155/2016/8760592

Cited by 15 publications

(9 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering equations (22), (19), and 14, we obtain Taking the boundary conditions r � r q and σ r � σ rq into account, we obtain…”

Section: Mechanical Analysis Of the Elastic Zonementioning

confidence: 99%

“…Yuan et al analyzed the influence of the weight, shape, falling height, and impact angle of rockfall on the impact force based on experiments [21]. Sun et al attempted to add discarded tires to the soil cushion layer and investigated the impact resistance of the new cushion structure via an experimental approach [22]. Zhang et al investigated the mechanical response mechanism of oil/gas pipe under rockfall impact using a numerical simulation method [23].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical Analysis of Rockfall Impacts on the Soil Cushion Layer of Protective Structures

Wang

Xia

Zhou

2018

Advances in Civil Engineering

View full text Add to dashboard Cite

During the Wenchuan Earthquake, with a magnitude of 5.12, collapses and rockfall hazards persisted for a long time after the initial investigations carried out by research fellow S. M. He and his team at the scene of the disaster in October 2008. It is possible that additional incidents of rockfalls in large quantities may continue in the same areas over the next ten to fifteen years. Furthermore, in the vast mountainous region of western China, the topographic relief is evident, and earthquakes occur frequently. Therefore, it is difficult to effectively defend against rockfall hazards. When designing protective structures, the key issue is the analysis of the mechanical response mechanism of the soil cushion layer of the upper cushion when subjected to the impact of rockfall. As such, a theoretical method was used to perform such an analysis. The cavity expansion and energy conservation model were adopted. Analytical solutions for the impact force and penetration depth were then derived. Furthermore, the impact force and penetration depth of rockfall were studied with the LS-DYNA software to obtain values for the impact forces and the penetration depth. Finally, the reliability of the theoretical method was evaluated using the cavity expansion, energy conservation, numerical simulation, Hertz, Japanese, Swiss, Australian, B. S. Guan, tunnel manual, and subgrade methods based on an engineering model. The results show that the cavity expansion and the energy conservation methods yielded consistent results. Meanwhile, the cavity expansion and the energy conservation methods also yielded consistent results with the numerical simulation, Japanese (obtained by laboratory experiment), Swiss (obtained by laboratory experiment), and Australian (obtained by field experiment) methods. The relevant methods and conclusions shall therefore be applied to the design of rockfall protection structure in future investigations.

show abstract

“…Considering equations (22), (19), and 14, we obtain Taking the boundary conditions r � r q and σ r � σ rq into account, we obtain…”

Section: Mechanical Analysis Of the Elastic Zonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Rockfall Impacts on the Soil Cushion Layer of Protective Structures

Wang

Xia

Zhou

2018

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…For instance, in high-speed railway engineering, rubber bearings were used as resilient elements to reduce train-induced vibrations transmitting to surrounding areas [10,11]. In similar scenarios of shelters subjected to rockfall impacts, the dynamic response of the shelters can be significantly reduced when sand cushion or used tire cushion layers were applied [12,13].…”

Section: Tube Assemblymentioning

confidence: 99%

Mitigation of Ground Vibration due to Collapse of a Large-Scale Cooling Tower with Novel Application of Materials as Cushions

Lin¹,

Zhong²

2017

Shock and Vibration

View full text Add to dashboard Cite

Ground vibration induced by the collapse of large-scale cooling towers in nuclear power plants (NPPs) has recently been realized as a potential secondary disaster to adjacent nuclear-related facilities with demands for vibration mitigation. The previous concept to design cooling towers and nuclear-related facilities operating in a containment as isolated components in NPPs is inappropriate in a limited site which is the cases for inland NPPs in China. This paper presents a numerical study on the mitigation of ground vibration in a "cooling tower-soil-containment" system via a novel application of two materials acting as cushions underneath cooling towers, that is, foamed concrete and a "tube assembly." Comprehensive "cooling tower-cushion-soil" models were built with reasonable cushion material models. Computational cases were performed to demonstrate the effect of vibration mitigation using seven earthquake waves. Results found that collapse-induced ground vibrations at a point with a distance of 300 m were reduced in average by 91%, 79%, and 92% in radial, tangential, and vertical directions when foamed concrete was used, and the vibrations at the same point were reduced by 53%, 32%, and 59% when the "tube assembly" was applied, respectively. Therefore, remarkable vibration mitigation was achieved in both cases to enhance the resilience of the "cooling tower-soil-containment" system against the secondary disaster.

show abstract

“…Wang et al [12] and Zarnani and Bathurst [13] also studied the buffering performance of expanded polystyrene (ESP) in civil air defence engineering and retaining wall projects. Sun et al [14] studied the buffering performance of a rubber tire cushion using 12 impact tests; they reported that rubber tires can significantly reduce the impact force, and the buffering performance will be further enhanced when the tire is filled with sand or gravel. Hsu et al [2,3] studied the impact resistance of a composite cushion made of EPS, a steel grille, and steel wire meshes; they found that in comparison to sand cushion, the composite cushion reduced the maximum impact force by 50%.…”

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

View full text Add to dashboard Cite

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.

show abstract

Performance of Used Tire Cushion Layer under Rockfall Impact

Cited by 15 publications

References 4 publications

Theoretical Analysis of Rockfall Impacts on the Soil Cushion Layer of Protective Structures

Theoretical Analysis of Rockfall Impacts on the Soil Cushion Layer of Protective Structures

Mitigation of Ground Vibration due to Collapse of a Large-Scale Cooling Tower with Novel Application of Materials as Cushions

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

Contact Info

Product

Resources

About