Examination of Interface Asperity and Particle Shape on the Mechanical Behavior of Soil-Structure Interfaces Using 3D Pr
- PDF / 1,882,608 Bytes
- 12 Pages / 595 x 786 pts Page_size
- 29 Downloads / 169 Views
pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-2131-6
Geotechnical Engineering
Examination of Interface Asperity and Particle Shape on the Mechanical Behavior of Soil-Structure Interfaces Using 3D Printed Models Xin Kang
a
, Hang Lei
a
, and Renpeng Chen
a
a
Dept. of Geotechnical Engineering, College of Civil Engineering, Hunan University, Changsha 410082, China
ARTICLE HISTORY
ABSTRACT
Received 24 November 2019 Accepted 16 September 2020 Published Online 4 December 2020
The influence of surface topography on the mechanical behavior of soil-structure interfaces over a range of particle sizes and shapes is systematically investigated in this research. 3D printed interfaces with different topographies and uniformly graded 3D printed soil particles and two types of natural sands (Ottawa sand 20/30 and Dolomite sand #1, #2 and #3) were employed and tested. Laboratory investigations showed that the shear strength and volume change responses of the 3D printed interfaces are positively influenced with the increase of the inclination of asperities. The proposed wedge friction model successfully explained the distinct mechanical behaviors of soil-structure interfaces under shearing. A "turning point" was found for the interface shear resistance with the increase of the inclination of asperities. When the surface topography produces passive resistance to the soil, the change of the surface topography has little effect on the interface mechanical behavior. The findings from this research will provide insights for soil-structure interface design and discrete element method (DEM) simulations in considering the mechanical behavior of soil-structure interfaces.
KEYWORDS Soil-structure interface Interface topography 3D printing Direct shear test Particle characteristics
1. Introduction The interfacial friction performance between soils and structures controls the capacity of many infrastructures and the efficiency of construction processes, which is shown in deep foundations, tunneling and transport processes. It is meaningful to study the behavior of soil-structure interfaces for the structural design of various geo-infrastructures (Jardine et al., 1993; Won and Kim, 2007; Kang et al., 2012; Portelinha et al., 2014; Tehrani et al., 2016). To this propose, many laboratory tests and numerical simulations have been introduced which indicate the interface roughness plays an important role in governing the soil-structure interactions (Milligan and Tei, 1998; Frost and DeJong, 2005; DeJong et al., 2017; Martinez and Frost, 2017; Jing et al., 2017; Martinez and Palumbo, 2018). There are many parameters to quantitatively characterize the interface roughness. For example, the most commonly used and applicable one is the relative roughness (Rn) proposed by Uesugi and Kishida (1986a). When the mean particle size (D50) is used as the gauge length, the ratio of the measured maximum height of asperity (Rmax) to D50 is referred to as Rn of the interface. Hu and Pu (2004) proposed the concept of cr
Data Loading...
