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Start Over Author "Lu, Liang" Publisher elsevier b.v.
332 results on '"Lu, Liang"'

49. Effects of rockfall shape on deformation performance of ground reinforced embankments subjected to lateral impact.

Author

Xiao, Liang, Lu, Liang, Li, Lanxing, Wang, Zongjian, and Arai, Katsuhiko

Subjects
*FAILURE mode & effects analysis, *EMBANKMENTS, *CONSTRUCTION materials, *GEOSYNTHETICS, *ROCKFALL, *SOILS
Abstract

Ground reinforced embankment (GRE) is an economical and efficient protection measure against rockfalls. In various design guidelines of ground reinforced embankments, the impact force of the rockfall is the principal factor, which is significantly affected by rockfall shape. This article conducts real scale tests and numerical tests to observe the external deformation behavior and the internal dynamic response of GREs subjected to lateral impact. Five shapes of the rockfalls corresponding to three contact types are set up in the tests. The experimental results show that the impact surface shapes of the rockfalls govern the penetration deformation patterns of the embankments, and the deformation extent of the disturbed soils. For different contact types between rockfalls and construction materials, the failure mode of the geosynthetics and the displacement distribution of the disturbed soils are distinguishing. The disturbed soils can be divided into two parts, the part surrounds the rockfall mainly expands laterally, and the rest is extruded and slips backward. Basically, the sharpness of the rockfall results in the deeper penetration and the smaller impact force. The influence of the rockfall shape needs to be carefully considered in the design of ground reinforced embankments. • The sharper rockfall results in deeper penetration and smaller impact force. • The failure of the geosynthetics and the displacement of the disturbed soils are affected by the rockfall shape. • The impact force of the rockfall is determined by the deformation extent of the disturbed soils. • The disturbed soil is divided into two parts, one part expands laterally, the other is extruded and slips backward. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Seismic time-history analysis of block-faced reinforced-soil retaining wall based on pseudo-dynamic method.

Author

Lu, Liang, Chen, Bo, Liu, Peng, Wang, Zongjian, and Arai, Katsuhiko

Subjects
*RETAINING walls, *REINFORCED soils, *DIFFERENTIAL equations, *EARTHQUAKES, *SURFACE fault ruptures
Abstract

The horizontal displacement of a reinforced-soil retaining wall is a common deformation mode of seismic damage. The horizontal displacement time history and accumulative deformation after earthquakes are important parameters for evaluating the seismic performance of a reinforced-soil retaining wall, but theoretical study on this issue is scarce at the moment. In this study, an analytical method is proposed to calculate the horizontal displacement time history of a block-faced reinforced soil retaining wall. The method is based on the pseudo-dynamic method and differential kinematics equations, and this method was used to calculate the reinforcement material's tensile displacement and overall displacement in the reinforced area under earthquake motion, while simultaneously taking into account the accumulative deformation. The rationality and accuracy of this method are verified through comparison with model experiments and existing theories. Besides, parameter analysis was carried out to further confirm the applicability of this method. The study shows the method takes into account the influence of the accumulated deformation, and can effectively calculate the horizontal displacement time history of the block-faced reinforced soil retaining wall under larger magnitudes. Although the calculated values are smaller than the actual deformation, they are still relatively close. • Based on pseudo dynamic method and differential kinematics equations, an analytical method is proposed to calculate the horizontal displacement time history of a block-faced reinforced soil retaining wall. [ABSTRACT FROM AUTHOR]

Published
2024
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