Abstract
Loess slope broadly distributes in Northwest China, making the slope of the area developed. And with the development number of construction projects still on the rise, this area is a high-intensity region with multiple earthquakes, resulting in landslide under earthquakes which is a very serious problem. However, the study on the loess slope dynamic response yet rarely involved the exploration of the influence of slope shapes, which leaves a hidden danger to the safety of local engineering. In this paper, a typical ladder-type loess slope in engineering is selected as a research object, and a numerical simulation model is established with FLAC3D program. The dynamic response of the loess slope with different shapes is studied deeply and systematically. Found a series phenomenon of earthquake response of loess slope with stepped slope series, the width of the platform and the slope ratio change under earthquakes. Meanwhile, the law of slope parameters such as slope series, platform width, and slope ratio on dynamic response of loess slope is revealed. The results provide theoretical support and scientific basis for the construction of the relevant projects in the area, which has important reference value to the safety of the engineering and the development of economic society.
Highlights
Loess is a kind of porous and weakly cemented quaternary sediment widely distributed in the Northwest China
The study of dynamic response of the loess slope is still in the exploratory stage. erefore, research on the seismic dynamic response of loess slopes with different shapes according to the needs of engineering construction in a loess region is of great significance for engineering safety and economic and social development of the region
In the case of different platform widths of the multistep loess slope, remarkable displacement occurs at the monitoring points of the front and rear edges of the first bench, and with the increase in bench width, the monitoring point where the maximum horizontal displacement occurs gets closer to the toe of the first slope step
Summary
Advances in Materials Science and Engineering thereof; Prestininzi and Romeo [8] presented the relation between seismic intensity and earthquake-induced landslide; Scheidegger [9] proposed the slide friction model of landslide mass; Jibson and Keefer [10] and Romeo [11] discussed how to determine the acceleration-time history of ground motion using Newmark analysis method; and other scholars studied on the influence of ground motion parameters upon dynamic response of a slope [12,13,14,15,16,17,18]. Research on seismic dynamic response of loess slope has up to now seldom focused on the factors related to the slope shape such as slope type and slope ratio, undoubtedly leaving hidden troubles for the safety of engineering construction in the loess regions prone to high-intensity earthquake [19,20,21,22]. The typical stepped loess slope in engineering construction is taken into consideration as the research object, and the numerical analysis model is established by using FLAC3D software to study the dynamic response of loess slopes with different shapes
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