金安桥电站库区碎石土边坡抗滑稳定研究
发布时间：2018-08-12 13:07
【摘要】：金安桥水电站位于金沙江中游,自2012年蓄水以来,库区边坡发生了多处不同程度的滑坡灾害,而渗流场的变化是导致滑坡灾害发生的主要原因。本文基于工程勘察,建立库区碎石土边坡二维饱和 非饱和渗流模型,模拟水库初期蓄水—常水位运行—放水过程中边坡渗流场和稳定的演变规律,分析库水位升降和水位下降速率对坡体浸润线和安全系数的影响。研究表明:水库初期蓄水过程,坡体浸润线形态表现为明显下凸,边坡安全系数表现出单调增加;常水位运行期,浸润线逐渐趋于平缓,安全系数表现出单调缓慢减小;放水期,浸润线形态明显上凸,安全系数表现出单调快速减小。本文研究的边坡是由古滑坡堆积而成,边坡条件不稳定,因而,在各时期内边坡安全系数都小于1,都可能会发生滑坡灾害;水位下降速率与边坡稳定成负相关关系。
[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.
【作者单位】： 昆明理工大学电力工程学院;云南交通咨询有限公司;中国电建集团昆明勘测设计研究院有限公司;
【基金】：云南省交通运输厅科技专项资金项目(云交科2014(A)16)
【分类号】：TV223
本文编号：2179147
[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.
【作者单位】： 昆明理工大学电力工程学院;云南交通咨询有限公司;中国电建集团昆明勘测设计研究院有限公司;
【基金】：云南省交通运输厅科技专项资金项目(云交科2014(A)16)
【分类号】：TV223
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