RS堆积体的成因机制及稳定性分析

doi:10.3724/1000-6915.jrme.2023.0997

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摘要某大型水电站设计的堆石坝坝高315 m，大坝上游5.4 km处的RS堆积体体积约4 700万方，其稳定性是工程关注的重点内容。总结性地介绍RS堆积体物成因机制与稳定性的研究成果。对堆积体物质组成及结构特征的现场调查分析揭示，堆积体下部物质包括了后缘陡崖崩塌块石、河流相冲积和上游冲沟的冰水泥石流堆积等多种成因；上部则为相对少见的坡面冰雪片流堆积、呈胶结及松散互层状结构特征，结构特征和力学特性与下部差异悬殊。以此为基础的定性分析和定量计算表明，堆积体下部物质具有较好强度和稳定性，堆积体缺乏整体滑移破坏的条件；水库蓄水后可能引起上部层状结构物质的顺层滑移，三维数值模拟揭示的潜在一次性最大滑移量约900万方，可作为涌浪风险评价、工程措施设计的依据。

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	杜帅群1
	湛正刚1
	李杨2
	郑雪玉1
	朱焕春2
	袁宇坤2

关键词 ：边坡工程, RS堆积体, 物质组成, 成因机制, 稳定性分析

Abstract：A rockfill dam with a crown height of 315 meters has been proposed as the water retention structure for a large hydropower station. The RS accumulation body is located approximately 5.4 km upstream of the dam，with an estimated volume exceeding 47 million cubic meters. The stability of this accumulation body is，therefore，a significant concern for the development of this project，prompting comprehensive studies. This paper presents a summary of the research conducted，focusing on the formulation and associated stability of the accumulation body. Site investigations have revealed that the accumulation body can be divided into two distinct parts based on the characteristics of the granular materials? compositions and structures. The lower part is formed from rock falls originating from the cliff behind，alluvial deposits along the river，and ice-water induced muddy flow from two nearby gullies. In contrast，the upper part exhibits an interbedded structure comprising granular materials，both glued and unglued，which is significantly different from that of the lower part and suggests a rare formation known as ice-snow sheet flow. These materials were transported by melting ice and snow and deposited interactively on the surface due to historical climate changes. Qualitative analyses and numerical modeling were subsequently conducted to assess the stability of the RS accumulation body. The findings indicate that the lower part is relatively stable，contributing positively to the overall stability of the entire structure. However，the potential for material sliding along the bedding in the upper part is expected to increase with the impoundment of the reservoir. The numerical model suggests a maximum failure volume of approximately 9 million cubic meters，which can be utilized as input for studies related to swell risk assessment and engineering design measures.

Key words： slope engineering RS accumulation body material composition formation mechanism stability analysis

引用本文:

杜帅群1，湛正刚1，李杨2，郑雪玉1，朱焕春2，袁宇坤2. RS堆积体的成因机制及稳定性分析[J]. 岩石力学与工程学报, 2025, 44(S1): 21-30.
DU Shuaiqun1，ZHAN Zhenggang1，LI Yang2，ZHENG Xueyu1，ZHU Huanchun2，YUAN Yukun2. Analysis on the formation mechanism and stability of the RS accumulation body. , 2025, 44(S1): 21-30.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2023.0997 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/IS1/21

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