Insight into unloading and geostress characteristics of high slopes based on valley evolution: a case study in Luding county, China

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-07-09 DOI:10.1007/s10064-025-04406-9

Hongfu Zhou, Shuwu Li, Fan Yang, Tian Fang, Rui Li, Jingyi Xue, Jinpeng Hu, Jiang Xing

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Abstract

The geostress field in valley areas with high tectonic stress is an important factor to consider in the construction of major projects. Taking the bank slope of the Dadu River Bridge in Luding County, China as an example, multiple methods were integrated to establish a numerical model. The unloading and secondary stress characteristics of the bank slope rock mass are then quantitatively researched through the multi-stage total process evolution of river undercutting. The results show that both slopes of the Dadu River Bridge had undergone significant geostress release and unloading rebound to the slope surface when the Dadu River cut down to the present-day valley. There was a low geostress zone (unloading relaxation zone) with a 40 ~ 70 m thickness in the shallow surface of the slope, and a high geostress zone occurred 120 ~ 250 m below the riverbed surface. There were “hump geostress” zones developed 150 ~ 500 m from the horizontal distance to the bank surface. Based on the research results, the concept and connotation of the hump index of geostress are proposed and defined to characterize the elevation degree of “hump geostress” compared with normal geostress. Understanding the spatial distribution of the geostress on bank slopes will have significant practical meaning for guiding geohazard prevention and mitigation and the construction and operation management of the Dadu River grand bridge.

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基于山谷演化的高边坡卸荷与地应力特征研究——以泸定县为例

高构造应力河谷地区的地应力场是重大工程建设中需要考虑的重要因素。以泸定县大渡河大桥岸坡为例，综合多种方法建立数值模型。通过河道开挖的多阶段全过程演化，定量研究了岸坡岩体的卸荷和次生应力特征。结果表明，在大渡河汇入现今河谷时，大渡河大桥两侧坡面均发生了明显的地应力释放和卸荷反弹。坡面浅部为40 ~ 70 m厚度的低地应力带（卸荷松弛带），河床下120 ~ 250 m处为高地应力带。在距岸面水平距离150 ~ 500 m处发育“驼峰地应力”带。在研究成果的基础上，提出并定义了地应力驼峰指数的概念和内涵，以表征“驼峰地应力”相对于正常地应力的高程程度。了解岸坡地应力的空间分布规律，对指导大渡河特大桥的地质灾害防治和建设运营管理具有重要的现实意义。

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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.