【摘要】：金安橋水電站位于金沙江中游,自2012年蓄水以來,庫區(qū)邊坡發(fā)生了多處不同程度的滑坡災害,而滲流場的變化是導致滑坡災害發(fā)生的主要原因。本文基于工程勘察,建立庫區(qū)碎石土邊坡二維飽和 非飽和滲流模型,模擬水庫初期蓄水—常水位運行—放水過程中邊坡滲流場和穩(wěn)定的演變規(guī)律,分析庫水位升降和水位下降速率對坡體浸潤線和安全系數(shù)的影響。研究表明:水庫初期蓄水過程,坡體浸潤線形態(tài)表現(xiàn)為明顯下凸,邊坡安全系數(shù)表現(xiàn)出單調(diào)增加;常水位運行期,浸潤線逐漸趨于平緩,安全系數(shù)表現(xiàn)出單調(diào)緩慢減小;放水期,浸潤線形態(tài)明顯上凸,安全系數(shù)表現(xiàn)出單調(diào)快速減小。本文研究的邊坡是由古滑坡堆積而成,邊坡條件不穩(wěn)定,因而,在各時期內(nèi)邊坡安全系數(shù)都小于1,都可能會發(fā)生滑坡災害;水位下降速率與邊坡穩(wěn)定成負相關關系。
[Abstract]:Jinanqiao Hydropower Station is located in the middle reaches of Jinsha River. Since 2012, there have been many landslide disasters on the slope of the reservoir area, and the change of seepage field is the main cause of the landslide disaster. Based on engineering investigation, a two-dimensional saturated unsaturated seepage model for gravel slope in reservoir area is established, which simulates the evolution of seepage field and stability of the slope during the process of initial reservoir storage, operation of constant water level and discharge. The influence of water level rise and fall rate on slope infiltration line and safety factor is analyzed. The results show that during the initial water storage process of the reservoir, the shape of the slope infiltrating line is obviously convex, the slope safety factor is monotonously increasing, the infiltration line gradually tends to be flat and the safety factor is monotonous and slowly decreases during the operation of the constant water level. During the discharge period, the wetting line was obviously convex, and the safety factor was monotone and rapid decrease. The slope studied in this paper is composed of ancient landslide, and the slope condition is unstable. Therefore, the slope safety factor is less than 1 in each period, and the landslide disaster may occur, and the rate of water level drop is negatively related to slope stability.
【作者單位】： 昆明理工大學電力工程學院;云南交通咨詢有限公司;中國電建集團昆明勘測設計研究院有限公司;
【基金】：云南省交通運輸廳科技專項資金項目(云交科2014(A)16)
【分類號】：TV223

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