Experimental study on dynamic characteristics of Qingyang loess under different water contents
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REVIEW PAPER
Experimental study on dynamic characteristics of Qingyang loess under different water contents Weifeng Yang 1 & Baoliu Pan 1 & Lu Jin 1 & Yan Wang 1 & Fahad Saleem 1 Received: 18 May 2019 / Accepted: 10 September 2020 # Saudi Society for Geosciences 2020
Abstract The complex cyclic stress state such as traffic load and seismic load effects proposes a new challenge for seismic design in the loess area. This paper presents an analysis of the dynamic characteristics and physical and chemical properties of Q3 loess in Qingyang of Gansu Province, China. The dynamic modulus, damping ratio, dynamic strength, and residual strain characteristics of the samples of intact loess under different water content and the saturated compacted loess under different dry densities and different confining pressures were studied through the dynamic triaxial tests. The experimental results show that under the same conditions, the dynamic modulus and dynamic strength of the intact loess sample decrease with the increase of water content, and the residual strain increases with the increase of water content. The intact sample under the natural water content has a large maximum modulus (315.3 MPa) and dynamic strength (325 kPa, using yield criteria) and smaller residual strain. The dynamic modulus and dynamic strength of the compacted sample increase with the increase of dry density and confining pressure, and the residual strain decreases with the increase of dry density. Compared with other regions, the dynamic modulus and dynamic strength of Q3 loess in the Qingyang area are relatively large, indicating that the structure of Qingyang loess is very strong, and the sand content is higher than other areas. Particle analysis shows that Q3 loess in Qingyang belongs to sandy loess and sand content reached 51.4%. Under the action of dynamic stress, the Qingyang loess shows strong elasticity. Keywords Loess . Dynamic triaxial test . Dynamic characteristics . Modulus
Introduction Loess is widely distributed in the central and western regions of China, such as Gansu, Shaanxi, and Shanxi where the earthquake intensity is high, and these areas are also the main producing areas of China’s coal. The implementation of coal resource exploitation and engineering construction causes very significant damage to the environment, which exacerbates the destruction of the fragile loess plateau ecological environment (Luehmann et al. 2013; Stevens et al. 2013; Xue et al. 2013; Hou et al. 2014). The resulting geological disasters, such as slope collapse and ground fissures, are also Responsible Editor: Zeynal Abiddin Erguler * Weifeng Yang [email protected] 1
Institute of Mine Water Hazards Prevention and Controlling Technology, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
frequent. Loess with its unique microstructure shows a strong dynamic vulnerability. The slope deformation and seismic subsidence of loess have a significant relationship with the structural properties of loess. Th
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