复杂水库调度及降雨条件下堆积体滑坡离心试验研究

doi:10.13722/j.cnki.jrme.2022.1223

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摘要复杂水库调度是指库水位经历多次上升或下降且速率前后不一致的工况，是工程中常见情况。为研究水库调度和降雨条件下库岸堆积体边坡滑动触发因素、演化规律及失稳机制，以HD库区典型堆积体边坡为原型，自制库水位变动与降雨耦合作用离心试验系统，设计水位上升→水位下降(慢速)→降雨→水位下降(快速)工况，开展离心机模型试验。分析试验全过程中边坡宏观变形、孔隙水压力及土压力变化特征，以探究复杂水库调度及降雨条件下堆积体边坡变形破坏机制。结果表明：水库蓄水阶段边坡变形不易察觉，主要发生边坡底滑面前缘局部坍塌；库水位骤降会诱发边坡产生中下部的分级滑动并带动后缘产生拉裂缝；降雨引起坡表侵蚀及边坡整体下沉，表现出推移式破坏特征；尽管第2次水位骤降速率是第1次的2倍，但边坡变形表现为以前缘局部牵引式下沉为主。

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	张强1
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	郑艳妮1
	贾朝军1
	陈鸿杰3
	程伟4

关键词 ：边坡工程, 库水位, 降雨, 堆积体边坡, 离心机试验, 破坏机制

Abstract：Complex reservoir scheduling refers to the operating conditions in which the water level of the reservoir undergoes multiple rises and falls at varying rates. To study the triggering factors，evolution laws and instability mechanisms of the slope failure of the embankment on a typical accumulation body in the HD reservoir area，a centrifuge experimental system was developed to simulate the coupling effects of reservoir scheduling and rainfall. The experimental design involved a water level rise，slow water level fall，rainfall，and fast water level fall scenario. The entire experimental process was analyzed to investigate the deformation and failure mechanisms of the accumulation body slope under complex reservoir scheduling and rainfall conditions. The findings demonstrate that the slope deformation，which mostly manifests as local collapse at the slope's leading edge during the reservoir filling stage，is difficult to detect. When the reservoir water level drops sharply，the slope undergoes a staged sliding in the middle and lower parts which causes tearing cracks at the rear edge. Rainfall leads to surface erosion and overall subsidence of the slope，which exhibits traction failure symptoms. Although the rate of the second water level dip is twice that of the first，the slope deformation is mainly characterized by local traction sinking at the front edge.

Key words： slope engineering water level rainfall accumulation slope centrifugal test failure mechanism

引用本文:

张强1，2，郑艳妮1，贾朝军1，陈鸿杰3，程伟4. 复杂水库调度及降雨条件下堆积体滑坡离心试验研究[J]. 岩石力学与工程学报, 2023, 42(10): 2427-2440.
ZHANG Qiang1，2，ZHENG Yanni1，JIA Chaojun1，CHEN Hongjie3，CHENG Wei4. Centrifugal experimental study on accumulation body landslides under complex reservoir operation and rainfall conditions. , 2023, 42(10): 2427-2440.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.1223 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I10/2427

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