Research on the spatiotemporal evolution of deformation and seismic dynamic response characteristics of high-steep loess slope on the northeast edge of the Qinghai-Tibet Plateau

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2024-12-23 DOI:10.1007/s10064-024-04051-8

Ziyue Xu, Shengyuan Song, Feng Wu, Chen Cao, Muye Ma, Sicong Wang

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引用次数: 0

Abstract

The high-steep loess slopes located in the transition zone between the landforms of the Qinghai Tibet Plateau and the Loess Plateau are prone to instability under rainfall and earthquakes conditions. Analyzing their stability and potential instability areas can help solve the problem of disaster prevention and control of high-steep loess slopes under complex landforms. This article took the high-steep loess slope on the northeast edge of the Qinghai Tibet Plateau as the research object, used small baseline subset Interferometric Synthetic Aperture Radar (SBAS-InSAR) to analyze the spatiotemporal evolution of slope deformation, and then used numerical simulation to research the static and dynamic response characteristics of slope. The results show that the slope deforms rapidly after heavy rainfall in August 2020, and the annual deformation rate is -11.2 ~ 3.0 mm/a within 5 years. The slope angle and slope height have an amplification effect on the peak ground acceleration (PGA) of slopes. PGA increases with the increase of slope height and slope angle, and the amplification coefficient of PGA reaches 1.67–3.18 times. Under natural, rainfall, and earthquake conditions, the displacement extremum zone of loess slopes is located at the shoulder of the slope. Based on the deformation spatiotemporal evolution characteristics and seismic dynamic response characteristics of loess slope, this paper identified three potential instability areas and instability factors of loess slope, providing theoretical support for the research of deformation and instability mechanisms of high-steep loess slopes on the northeast edge of the Qinghai Tibet Plateau.

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.